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Why the Ford Pinto didn’t suck

Why the Ford Pinto didn't suckThe Ford Pinto was born a low-rent, stumpy thing in Dearborn 40 years ago and grew to become one of the most infamous cars in history. The thing is that it didn't actually suck. Really.

Even after four decades, what's the first thing that comes to mind when most people think of the Ford Pinto? Ka-BLAM! The truth is the Pinto was more than that — and this is the story of how the exploding Pinto became a pre-apocalyptic narrative, how the myth was exposed, and why you should race one.

The Pinto was CEO Lee Iacocca's baby, a homegrown answer to the threat of compact-sized economy cars from Japan and Germany, the sales of which had grown significantly throughout the 1960s. Iacocca demanded the Pinto cost under $2,000, and weigh under 2,000 pounds. It was an all-hands-on-deck project, and Ford got it done in 25 months from concept to production.

Building its own small car meant Ford's buyers wouldn't have to hew to the Japanese government's size-tamping regulations; Ford would have the freedom to choose its own exterior dimensions and engine sizes based on market needs (as did Chevy with the Vega and AMC with the Gremlin). And people cold dug it.

When it was unveiled in late 1970 (ominously on September 11), US buyers noted the Pinto's pleasant shape — bringing to mind a certain tailless amphibian — and interior layout hinting at a hipster's sunken living room. Some call it one of the ugliest cars ever made, but like fans of Mischa Barton, Pinto lovers care not what others think. With its strong Kent OHV four (a distant cousin of the Lotus TwinCam), the Pinto could at least keep up with its peers, despite its drum brakes and as long as one looked past its Russian-roulette build quality.

But what of the elephant in the Pinto's room? Yes, the whole blowing-up-on-rear-end-impact thing. It all started a little more than a year after the Pinto's arrival.

 

Grimshaw v. Ford Motor Company

On May 28, 1972, Mrs. Lilly Gray and 13-year-old passenger Richard Grimshaw, set out from Anaheim, California toward Barstow in Gray's six-month-old Ford Pinto. Gray had been having trouble with the car since new, returning it to the dealer several times for stalling. After stopping in San Bernardino for gasoline, Gray got back on I-15 and accelerated to around 65 mph. Approaching traffic congestion, she moved from the left lane to the middle lane, where the car suddenly stalled and came to a stop. A 1962 Ford Galaxie, the driver unable to stop or swerve in time, rear-ended the Pinto. The Pinto's gas tank was driven forward, and punctured on the bolts of the differential housing.

As the rear wheel well sections separated from the floor pan, a full tank of fuel sprayed straight into the passenger compartment, which was engulfed in flames. Gray later died from congestive heart failure, a direct result of being nearly incinerated, while Grimshaw was burned severely and left permanently disfigured. Grimshaw and the Gray family sued Ford Motor Company (among others), and after a six-month jury trial, verdicts were returned against Ford Motor Company. Ford did not contest amount of compensatory damages awarded to Grimshaw and the Gray family, and a jury awarded the plaintiffs $125 million, which the judge in the case subsequently reduced to the low seven figures. Other crashes and other lawsuits followed.

Why the Ford Pinto didn't suck

Mother Jones and Pinto Madness

In 1977, Mark Dowie, business manager of Mother Jones magazine published an article on the Pinto's "exploding gas tanks." It's the same article in which we first heard the chilling phrase, "How much does Ford think your life is worth?" Dowie had spent days sorting through filing cabinets at the Department of Transportation, examining paperwork Ford had produced as part of a lobbying effort to defeat a federal rear-end collision standard. That's where Dowie uncovered an innocuous-looking memo entitled "Fatalities Associated with Crash-Induced Fuel Leakage and Fires."

The Car Talk blog describes why the memo proved so damning.

In it, Ford's director of auto safety estimated that equipping the Pinto with [an] $11 part would prevent 180 burn deaths, 180 serious burn injuries and 2,100 burned cars, for a total cost of $137 million. Paying out $200,000 per death, $67,000 per injury and $700 per vehicle would cost only $49.15 million.

The government would, in 1978, demand Ford recall the million or so Pintos on the road to deal with the potential for gas-tank punctures. That "smoking gun" memo would become a symbol for corporate callousness and indifference to human life, haunting Ford (and other automakers) for decades. But despite the memo's cold calculations, was Ford characterized fairly as the Kevorkian of automakers?

Perhaps not. In 1991, A Rutgers Law Journal report [PDF] showed the total number of Pinto fires, out of 2 million cars and 10 years of production, stalled at 27. It was no more than any other vehicle, averaged out, and certainly not the thousand or more suggested by Mother Jones.

Why the Ford Pinto didn't suck

The big rebuttal, and vindication?

But what of the so-called "smoking gun" memo Dowie had unearthed? Surely Ford, and Lee Iacocca himself, were part of a ruthless establishment who didn't care if its customers lived or died, right? Well, not really. Remember that the memo was a lobbying document whose audience was intended to be the NHTSA. The memo didn't refer to Pintos, or even Ford products, specifically, but American cars in general. It also considered rollovers not rear-end collisions. And that chilling assignment of value to a human life? Indeed, it was federal regulators who often considered that startling concept in their own deliberations. The value figure used in Ford's memo was the same one regulators had themselves set forth.

In fact, measured by occupant fatalities per million cars in use during 1975 and 1976, the Pinto's safety record compared favorably to other subcompacts like the AMC Gremlin, Chevy Vega, Toyota Corolla and VW Beetle.

And what of Mother Jones' Dowie? As the Car Talk blog points out, Dowie now calls the Pinto, "a fabulous vehicle that got great gas mileage," if not for that one flaw: The legendary "$11 part."

Why the Ford Pinto didn't suck

Pinto Racing Doesn't Suck

Back in 1974, Car and Driver magazine created a Pinto for racing, an exercise to prove brains and common sense were more important than an unlimited budget and superstar power. As Patrick Bedard wrote in the March, 1975 issue of Car and Driver, "It's a great car to drive, this Pinto," referring to the racer the magazine prepared for the Goodrich Radial Challenge, an IMSA-sanctioned road racing series for small sedans.

Why'd they pick a Pinto over, say, a BMW 2002 or AMC Gremlin? Current owner of the prepped Pinto, Fox Motorsports says it was a matter of comparing the car's frontal area, weight, piston displacement, handling, wheel width, and horsepower to other cars of the day that would meet the entry criteria. (Racers like Jerry Walsh had by then already been fielding Pintos in IMSA's "Baby Grand" class.)

Bedard, along with Ron Nash and company procured a 30,000-mile 1972 Pinto two-door to transform. In addition to safety, chassis and differential mods, the team traded a 200-pound IMSA weight penalty for the power gain of Ford's 2.3-liter engine, which Bedard said "tipped the scales" in the Pinto's favor. But according to Bedard, it sounds like the real advantage was in the turns, thanks to some add-ons from Mssrs. Koni and Bilstein.

"The Pinto's advantage was cornering ability," Bedard wrote. "I don't think there was another car in the B. F. Goodrich series that was quicker through the turns on a dry track. The steering is light and quick, and the suspension is direct and predictable in a way that street cars never can be. It never darts over bumps, the axle is perfectly controlled and the suspension doesn't bottom."

Need more proof of the Pinto's lack of suck? Check out the SCCA Washington, DC region's spec-Pinto series.

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My Somewhat Begrudging Apology To Ford Pinto

ford-pinto.jpg

I never thought I’d offer an apology to the Ford Pinto, but I guess I owe it one.

I had a Pinto in the 1970s. Actually, my wife bought it a few months before we got married. The car became sort of a wedding dowry. So did the remaining 80% of the outstanding auto loan.

During a relatively brief ownership, the Pinto’s repair costs exceeded the original price of the car. It wasn’t a question of if it would fail, but when. And where. Sometimes, it simply wouldn’t start in the driveway. Other times, it would conk out at a busy intersection.

It ranks as the worst car I ever had. That was back when some auto makers made quality something like Job 100, certainly not Job 1.

Despite my bad Pinto experience, I suppose an apology is in order because of a recent blog I wrote. It centered on Toyota’s sudden-acceleration problems. But in discussing those, I invoked the memory of exploding Pintos, perpetuating an inaccuracy.

The widespread allegation was that, due to a design flaw, Pinto fuel tanks could readily blow up in rear-end collisions, setting the car and its occupants afire.

People started calling the Pinto “the barbecue that seats four.” And the lawsuits spread like wild fire.

Responding to my blog, a Ford (“I would very much prefer to keep my name out of print”) manager contacted me to set the record straight.

He says exploding Pintos were a myth that an investigation debunked nearly 20 years ago. He cites Gary Schwartz’ 1991 Rutgers Law Review paper that cut through the wild claims and examined what really happened.

Schwartz methodically determined the actual number of Pinto rear-end explosion deaths was not in the thousands, as commonly thought, but 27.

In 1975-76, the Pinto averaged 310 fatalities a year. But the similar-size Toyota Corolla averaged 313, the VW Beetle 374 and the Datsun 1200/210 came in at 405.

Yes, there were cases such as a Pinto exploding while parked on the shoulder of the road and hit from behind by a speeding pickup truck. But fiery rear-end collisions comprised only 0.6% of all fatalities back then, and the Pinto had a lower death rate in that category than the average compact or subcompact, Schwartz said after crunching the numbers. Nor was there anything about the Pinto’s rear-end design that made it particularly unsafe.

Not content to portray the Pinto as an incendiary device, ABC’s 20/20 decided to really heat things up in a 1978 broadcast containing “startling new developments.” ABC breathlessly reported that, not just Pintos, but fullsize Fords could blow up if hit from behind.

20/20 thereupon aired a video, shot by UCLA researchers, showing a Ford sedan getting rear-ended and bursting into flames. A couple of problems with that video:

One, it was shot 10 years earlier.

Two, the UCLA researchers had openly said in a published report that they intentionally rigged the vehicle with an explosive.

That’s because the test was to determine how a crash fire affected the car’s interior, not to show how easily Fords became fire balls. They said they had to use an accelerant because crash blazes on their own are so rare. They had tried to induce a vehicle fire in a crash without using an igniter, but failed.

ABC failed to mention any of that when correspondent Sylvia Chase reported on “Ford’s secret rear-end crash tests.”

We could forgive ABC for that botched reporting job. After all, it was 32 years ago. But a few weeks ago, ABC, in another one of its rigged auto exposes, showed video of a Toyota apparently accelerating on its own.

Turns out, the “runaway” vehicle had help from an associate professor. He built a gizmo with an on-off switch to provide acceleration on demand. Well, at least ABC didn’t show the Toyota slamming into a wall and bursting into flames.

In my blog, I also mentioned that Ford’s woes got worse in the 1970s with the supposed uncovering of an internal memo by a Ford attorney who allegedly calculated it would cost less to pay off wrongful-death suits than to redesign the Pinto.

It became known as the “Ford Pinto memo,” a smoking gun. But Schwartz looked into that, too. He reported the memo did not pertain to Pintos or any Ford products. Instead, it had to do with American vehicles in general.

It dealt with rollovers, not rear-end crashes. It did not address tort liability at all, let alone advocate it as a cheaper alternative to a redesign. It put a value to human life because federal regulators themselves did so.

The memo was meant for regulators’ eyes only. But it was off to the races after Mother Jones magazine got a hold of a copy and reported what wasn’t the case.

The exploding-Pinto myth lives on, largely because more Americans watch 20/20 than read the Rutgers Law Review. One wonders what people will recollect in 2040 about Toyota’s sudden accelerations, which more and more look like driver error and, in some cases, driver shams.

So I guess I owe the Pinto an apology. But it’s half-hearted, because my Pinto gave me much grief, even though, as the Ford manager notes, “it was a cheap car, built long ago and lots of things have changed, almost all for the better.”

Here goes: If I said anything that offended you, Pinto, I’m sorry. And thanks for not blowing up on me.

Cheep way to adjust fuel mixture with holly webber 5200

Started by LongTimeFordMan, December 09, 2019, 06:31:59 PM

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LongTimeFordMan

Actually i finally connected the pcv  valve as per factory the carb has a hot water heater in the manifold.

I put 140 main jets and 150 air bleeds in both primary and secondary that produced good torque to 6000 with secondary opening at about half throttle

I checked the well tubes didnt see any numbers from the top and couldnt remove them but the one with the larger bore was in the primary side.

Did an 80 mile test run on flat road with speed between 50 and 70, mostly 55 to 65

Refilled tank and it took about 3.2 gallons for about 24.7 mpg so i figured that was good.

Am now doing an around town test for 100 miles to check that mileage as well.
Red 1973 pinto wagon DD, SoCal desert car, Factory 4 speed, 3.40 gears, Stock engine, 14" rims and tires, 60 K original miles

pinto_one

I would leave the PVC valve set up the way it is , but make sure you have a good name brand valve , seen some fit all copys that will bleed to much ait and mess up the idiel ,  next is to make sure you have the right well tubes , the ones under the air bleeds , some were stamped with diffrent numbers , easy to get swaped in the wrong hole , from what I can remember the number is stamped on the end , last you can narrow the adjustment down by disconecting the linkage to the secondary , just run one barrel and tune , you will always get the best MPG out of of it because carb works its best wide open , last is do you have the exhaust heat to carb hooked up ??
76 Pinto sedan V6 , 79 pinto cruiser wagon V6 soon to be diesel or 4.0

LongTimeFordMan

Testing the latest jet combination i discovered that a similar condition still exists, rich during idle and cruise and lean durning hard accelleration causing a momentary hesitation.

Opposite of the ideal.situation of lean cruise and rich accelleration.

It occurred to me that i connected the crankcase vent with the stock PCV valve to the intake manifold as per factory stock setup.

Thinking about that i realized that under high vacuum conditions ie idle.and cruise the valve is closed allowing the carburetor to determine fuel mixture

BUT at low vacuum during sudden acceleration the manifold vacuum drops and the valve opens to allow a sudden rush of unc9ntrolled and uncarburetated air into the intake manifold leaning the mixture.valve.

I also have the breather tube from the oil filler cap tk the air cleaner connected so i am going to try to block off the vacuum port to the intake manifold for the crankcase vent and as well the v3nt from the crankcase .

In theory that way the only air entering the intake manifold should be a controlled mixture from the carburetor.

Any ideas?
Red 1973 pinto wagon DD, SoCal desert car, Factory 4 speed, 3.40 gears, Stock engine, 14" rims and tires, 60 K original miles

Wittsend

It is always a tough call whether it is 'Holley spent mega $$$ on research and who are we to know better' and, 'these carbs were set up for a poor smog control situation and certainly that can be improved upon.'

The nice thing about SU's is they are so easy to fiddle with. Different viscosity in the damper..., a few twist of the main jet position. On the other side when you start getting to different taper needles, and hand sanded needles that get just as complicated as any carb.

I love the EFI in my Turbo Pinto. 31 year old engine in a 46 year old car, it sits for months and starts at the turn of a key.

LongTimeFordMan

Ongoing saga of holley 5200 jet search

Welll..

After  numerous partially successful experiments with drilling the nets and using wires to resize them J decided to drill the main jets to 1.4 mm (140 microns) and use the approx 165-170 airbleed in the primary and redrill the secondary to approx 160

This resulted in a lean mix and bog.

SOOO..

I kept the 140 main jets and moved the 160 to the primary and filled the secondary with solder and redrilled it to about 140 ish.

This c9mbination seems.to.run pretty well, not great but engine gets to.6000 in first and 55oo in second, minimal bog at 1700 in 4th

Noticeable transitions between idle, main and secondary stages.

AFR gauge reads about 14.5 -15 ratio

Not sure about the mileage yet

So i guess this is about as good as the 5200 will get.

Definitely about 2/3 the torque of the SUs and not nearly as smooth

Also.takes a lot more pedal to.cruise at 50-70 mph

Drivable but i am eager to get the  new manifold for the SUs welded up and get them back on
Red 1973 pinto wagon DD, SoCal desert car, Factory 4 speed, 3.40 gears, Stock engine, 14" rims and tires, 60 K original miles

LongTimeFordMan

Update on 5200 ca4b jetting

Well i installed an air /fuel meter "AFM" to check the mixture.

I had a bung welded into the exhaust pipe about 2 ft downstream from the junction with the exhaust manifold and installed a cheep Bosch 3 wire heated O2 sensor.

This unit opuputs 0-1 volts depending on the mixture. 0 = lean 9= rich.

Actually a pretty flat curve from 17:1 to 15:1 then  the voltage rised to a max of about .9 volts at about 14:1 to 10:1 see attached graph.

I used a gauge from amazon

https://www.amazon.com/ESUPPORT-52mm-Fuel-Ratio-Gauge/dp/B00SMJ0BTQ

And compared readings from O2 sensor between gauge and a digital voltmeter and saw that the gauge is linear from 0 to .9 v and matched the viltmeter.  Midpoint of .5 v is straight up and indicates about 14.5:1 ratio.

So the entire range of the meter matches the working range of the sensor about 14:1 to 16:1 pretty much the ideal range so if you have a very rich or lean condition the meter would probably go off scale.

with my current jetting the engine idles at about .8v or about 14.3:1
Cruise varies from .6-.8v

Sudden throttle open and voltage drops to about .3-.5 v still  close to optimum mix.

I will measure the  current jets and post info about the sizes as soon as i have time.

If anyone is interested in installing a AFM gauge i woud recommend this one.

The gauge has 3 wires

Red power for illumination,
Green for signal from O2 sensor
Black for ground for both illumination and signal.

O2 sensor has 3 wires one for power to heater it  it uses about 4 amps

One ground for heater usually the heater wires are the same color and signal is differen.

One for signal

BUT make sure that you run a ground wire from the exhaust pipe to the gauge otherwise the reading wont be correct.

Red 1973 pinto wagon DD, SoCal desert car, Factory 4 speed, 3.40 gears, Stock engine, 14" rims and tires, 60 K original miles

LongTimeFordMan

You re welcome..

My car is sort of a test platform.as i am always tinkering with it to try to make small improvements for reliability, performance and wxonomy without major mods.

Interesting that you have found incorrectly installed jets as well.

Wonder if they were that way from the factry or switched during a "rebuild"?

Mine also had a mix of size designations so i dont really know what size they are.

As i mentioned i found a set of mertic drills 1-2 mm on amazon that comen in a box that has marked storage spaces.

I plan to paint the shanks of the drills with paint matching the resistor color codes, 1.10= black 1.2= brown 1.3= red etc so i can use them as size gauges for the future.

Will post info about fuel mileage when i have a few milles on the current config.

Red 1973 pinto wagon DD, SoCal desert car, Factory 4 speed, 3.40 gears, Stock engine, 14" rims and tires, 60 K original miles

pinto_one

Good info on the old webber 5200 , Make note that the later copys 5210 and newer are diffrent , the older one were 270 CFM and newer (or Last ) ones were 235 CFM and the jets were maker for flow , I remember working on these when a pinto owner would come into the ford dealer with problems with the carb , yes they were always were just cleaned up with a carb kit installed , yep the air bleed jets and tubes were always in the wrong place and jets also , and somtimes the idle jet was missing ,  more offten when the carb was put togather wrong it is always put back wrong , just to let eveyone know that when you do take one of these apart write down the numbers of each number of the jets and bleeds and where they go , Thanks for Long Time Ford Man digging up this long lost info ,
76 Pinto sedan V6 , 79 pinto cruiser wagon V6 soon to be diesel or 4.0

LongTimeFordMan

Maybe there is hope for making these carbs work..

Found an interesting article on modding the 5200 for racing

http://www.thelolaregistry.com/DIY/Weber.htm

I also found a boxed set of 150 metric drill bits that include  in sizes from 1.10 to 2.0 in increments of .01 mm along with smaller and larger ones on amazon

https://www.amazon.com/Unxuey-Precision-Drilling-Plastic-0-4mm-3-2mm/dp/B07T2YGB8B

These correspond to the weber jet sizes

1.20 = 120
1.40 = 140 etc

Meanwhile Im cutting new runners for the redesigned manifold for the 2 Su carbs.

Hopefully Ill get it finished soon
Red 1973 pinto wagon DD, SoCal desert car, Factory 4 speed, 3.40 gears, Stock engine, 14" rims and tires, 60 K original miles

Wittsend

Interesting, "Tuning by Wire." It is actually an interesting prospect. Sort of like the rods in Carter/Edelbrock/SU carbs (granted not tapered).

  I have soldered up holes in jets and then drilled them to a specific size. Not sure if it holds long term. But if there is any breakdown of the soldier..., well, you are getting a lead additive.

LongTimeFordMan

As some of you all know i built an intake kanifold for 2 SU carburetors awhile back

It ran great but i decided to do some redesign and temporarily fitted the stock holley webber 5200 2hich ran like crap..

Ive been doing some research and did some mods on the linkage as I described in another post.

With the SU carbs the engine ran easily up to 6000 plus rpm and had great torque but gas mileage suffered.

With the 5200 it hardly got up to 4500 and ran really rough and strained at 4000 plus.

The carb was a "rebuilt" one fitted by the previous owner

I checked the jets and discovered that when the carb was "rebuilt" the primary and secondary main and air bleed jets were both swapped.

To.complicate things there are 3 different measuring systems used to designate jet s8zes for the 5200, flow rate, micron and thousands inch hile diameters.

Here are some jet size comparisons i found

103 cc/min=105 microns, or 41.34 thou
128 cc/min=110 microns, or 43.31 thou*
152 cc/min=115 microns, or 45.28 thou*
178 cc/min=120 microns, or 47.24 thou*
201 cc/min=125 microns, or 49.21 thou*
225 cc/min=130 microns, or 51.18 thou
2 51 cc/min=135 microns, or 53.15 thou
275 cc/min=140 microns, or 55.12 thou
298 cc/min=145 microns, or 57.09 thou
325 cc/min=150 microns, or 59.06 thou*
346 cc/min=155 microns, or 61.02 thou
375 cc/min=160 microns, or 62.99 thou
400 cc/min=165 microns, or 64.96 thou*
425 cc/min=170 microns, or 66.93 thou*
450 cc/min=175 microns, or 68.90 thou*
475 cc/min=180 microns, or 70.87 thou
525 cc/min=185 microns, or 72.83 thou*

Fuel flow is controlled by a combination 9f the main jets in the bowl.and air bleeds or compensators.

main jets in the bowl meter gas to venturies and gas and diluted by air  bleeds or "compensators" at 5he top to lean mixture.

Bigger mains = rich

Bigger bleeds = lean.

Basic theory

Run primaries with large mains large bleeds

Secondaries smaller jets smaller bleeds

Sounds backwards but thats how they work.

Sp3cs from an international harvestor website with 4 and 6 cyl engines.


4 cylinder
Primary Main Jet 140
Secondary Main Jet 140
Primary Air Corrector Jet 170
Secondary Air Corrector Jet 160
Primary Idle Jet 060
Secondary Idle Jet 050
Pump Jet 050

6 cylinder
Primary Main Jet 160
Secondary Main Jet 160
Primary Air Corrector Jet 190
Secondary Air Corrector Jet 180
Primary Idle Jet 075
Secondary Idle Jet 065
Pump Jet 060

Since The carb is supposed to have about 140 micron main jets in the primary and secondary and 170-160 micron jets in the air bleeds.

Mine were way small and had a small one in primay side and large in secondary.

Well i researched sources for jets and got really confused and couldnt make any sense of the sellers and supposedly the jets cost like $8 apiece or $32 for a set which may or may not work.

SOOO...

All the "experts" on webbers say that you shouldnt drill the jets which i sorta agree with but since i couldnt find jets so  i decided to drill.

I also installed a cheep narrrow band fuel air meter..
Air fuel gauge doesnt have numbers but looks like an oil pressure gauge with a rotating needle. If you assume that the scale went from 0 to 100 Supposedly "optimum" mix would be at 50 max lean at 0 and max rich was at 100

I sawpped the primary and secondary jets and Performance improved dramatically with jets in proper holes but Gas mileage was about 10-12 20 highway and gauge stayed at 85, sometimes dropped to 60

So i decided to enlarge the primary air bleeds to.lean the primary mix.

I got a set of "metric" drills from amazone and found that in the set there were about 5 s8zed from .060 to .070

So i selected a middle sized on  probably about .065 or so for the primary air bleed and drilled.

Well it turns out that the enlarged hile was too big and the mix was too lean, car bucked and bogged.

Gauge read 85 at idle but dropped to about 20-30 at hard acceperation indicating lean.

Hmm how to reduce the size of the air bleed.. cant make the hole smaller. but you can obstruct it to reduce the flow.

So.. i cut about an inch of 24 gauge wire from an ethernet cable, stripped the insulation, bent a piece into  a "U" shape and stuck it into the primary air bleed see pix.

Car ran strong but gauge indicated rich once more, always around 60 -80 just a little rich.

I then used a single wire inserted into the primary air bleed and now car runs good not great but gauge reads 85 at idelllle and cruise, 30-40 at hard acceleration in secondaries, pulls to .6000 good good but not great torque so I suppose the mixture is about right.

See attached photo.

Will.check the mileage and update.

Bottom line.. air bleed.size seems very critical.since the addition of a thin wire can affect the mixture a lot..

But good news is that if you need to play with the jetting just drill the bleeds a bit oversixlze and add some wires to fich up the mixture till you get the performance you want.

A lot cheeper than buying jets at $32 a pop.

Btw..I also noticed that the booster venturies were l99se so i removed them applied superglue to them reinstalled andmpeened them in.




Red 1973 pinto wagon DD, SoCal desert car, Factory 4 speed, 3.40 gears, Stock engine, 14" rims and tires, 60 K original miles