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Author Topic: Is the Offenhauser 2.0L dual plane 2 barrel version any good?  (Read 7703 times)

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Offline Pinto5.0

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I know the 4 barrel versions are useless & kill low end torque but has anyone tried the 2 barrel version before? I got it for about the price of a stock 2.0 intake & since the engine I need it for didn't come with an intake I figure I have nothing to lose.
 
The engine it's going on has a mild cam & a header but is otherwise stock. I have an NOS 5200 carb to run on it.
 
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Offline amc49

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #1 on: March 07, 2014, 03:10:17 AM »
It should work just fine.

Offline Scott Hamilton

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #2 on: March 08, 2014, 11:01:49 AM »
I have run this intake for years, I now have a Webber carb on it- Honestly I can't say I saw any 'improvement' over stock, but it runs great with it. I bought a header from Bill recently and am working today to install- I've heard that this intake w/header will improve gas mileage and that's what I'm after... :)
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Offline Pinto5.0

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #3 on: March 08, 2014, 03:23:07 PM »
I have run this intake for years, I now have a Webber carb on it- Honestly I can't say I saw any 'improvement' over stock, but it runs great with it. I bought a header from Bill recently and am working today to install- I've heard that this intake w/header will improve gas mileage and that's what I'm after... :)

That's good to hear. I was going to run the 4-bbl. intake with a carb adapter to put a 2-bbl. on it but this is easier. I'd like to get it polished along with the valve cover I just bought. If I was smart I'd send the vintage header out to get coated inside & out while I was making things pretty. I'm hoping to get 25 mpg out of the 71 with the 2.0L so if this helps in that regard I wont complain.
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Offline Scott Hamilton

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #4 on: March 08, 2014, 04:27:05 PM »
I'm getting 24.6 mpg without the header... Running the 93 octane.. Wondering if this will get me any more- don't know...



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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #5 on: March 08, 2014, 05:38:22 PM »
Stock 2.0 intake is one of the best stock intake ever made. Keep what you've got and put a 38/38 Weber on it and enjoy.
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Offline Pinto5.0

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #6 on: March 08, 2014, 07:21:52 PM »
Stock 2.0 intake is one of the best stock intake ever made. Keep what you've got and put a 38/38 Weber on it and enjoy.

The engine came with an Offy 4-bbl intake. I didn't have a stock intake to run.
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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #7 on: March 10, 2014, 03:12:40 AM »
38/38 may not fit there, from where I'm sittin' the carb bores appear to be staggered in size.

Offline 74 PintoWagon

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #8 on: March 10, 2014, 07:47:38 AM »
Kinda looks different size???, or it could be just the angle of the pic??..
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Offline Scott Hamilton

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #9 on: March 10, 2014, 02:26:01 PM »
They are different sizes... AMC, 38/38 refers to a carb but I'm not well versed here-  I have a webber on mine, Here is the link describing the carb I'm running...  If you see any issues, I'm all ears...

http://www.fordpinto.com/pinto-faq/5200-to-webber-conversion/msg139495/#msg139495

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #10 on: March 10, 2014, 04:02:35 PM »
If it doesn't fit, it would be an easy fix. I had a 40/40 on a stock intake, so it can be done.
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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #11 on: March 10, 2014, 06:16:40 PM »
38/38 may not fit there, from where I'm sittin' the carb bores appear to be staggered in size.

My gf texted me that it arrived today. I'll check it out better but I believe the bores are staggered.
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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #12 on: March 10, 2014, 07:32:58 PM »
If it doesn't fit, it would be an easy fix. I had a 40/40 on a stock intake, so it can be done.

I've had a Weber 38 DGAS on a slightly massaged stock ford 2.0 EAO manifold. I made my own aluminum cable mount , and removed the auto choke and made blanking plate and set up with manual choke. With a Redline/ K&N filter assy it just cleared the hood. This is the Best 2bbl for a bolt on application, and it requires little air correction for a small flat spot off idle.  This put the Punch back in the stock 2.0L engine and with 4 into 1 headers, it built torque right now!
 Other setups may work as well, but a weber 40/40 2bbl is best for racing only, Per Dave Vizard book on 2.0 Pinto engine mods
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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #13 on: March 10, 2014, 07:37:40 PM »

 We should all be so lucky to understand CARBs and the War on Carbs by C.A.R.B. (The smog gods in Sacto : the California Air Resources Board, soon to be monitoring Human flatulence)

 Pintosopher, one venturi away  from a total Standoff! ??? ;)

Given adequate time I'm sure they will assess a "gas" tax on all flatus expelling Americans....
 
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Offline amc49

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #14 on: March 11, 2014, 03:36:24 AM »
The 38/38 will work, just whether it opens butterfly without hitting smaller bore. It may well do it. I myself prefer equal venturis/throttles to have equal bores in manifold myself. I/m sure a 38/38 worked out would be gangbusters. The 38 if like most manufacturers refers to the choke portion of the carb, or the venturi diameter itself, not the actual choke WE here in the states talk about.

Weber, Holley, Motorcraft, Rochester, Hitachi, etc. they are all the same to me, the internal design features are what set them apart. I have no trouble understanding what every little hole and passage does in pretty much every carb made. And if not, I can figure it out in maybe 60 seconds by tracing the circuit to see what it does.

Offline 74 PintoWagon

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #15 on: March 11, 2014, 08:00:44 AM »
Bore shouldn't be a problem just make a spacer and blend it to the bore sizes.
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Offline amc49

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #16 on: March 11, 2014, 10:27:35 PM »
That would work, the ideal is not to be necking things down though and added height to intake that may not clear hood. Necking down is the same thing as going back to a 32/36 standard carb. Or lost the reason why you got the bigger carb to begin with. Actually a bit worse, no carb pulls as hard on the venturi with a similar sized choke placed below the carb itself. Why Nascar makes engines run restrictor plates. You always want the bore below carb to be same size or larger as carb base below throttle plates........ .smaller is a sure power killer. The only small choke intended anywhere in an intake is the actual venturi itself, the angles both into and out of it (7 degree into and 22 out or somewhere close) are specifically chosen to recover most of the flow lost going through the venturi, you will not have that recovery process on a simple necking down of the hole further down. In short, it may restrict more than the carb venturi does and detract from the venturi effect itself. Not the hot setup for a bigger carb which needs all the signal it can get to begin with. You want the hole underneath carb to be as big as practical to overall flow so carb sees every bit of signal from engine it can as fast as possible. I myself like the open single oval bore rather than two small ones, it allows more intermix between bores and higher up to more evenly spread out the two mixture streams into each other. Despite all the things you do to get both bore flows the same mixture they always vary and better to mix them up earlier to nullify that effect. It leads to more even fuel distribution among all cylinders. That Offy manifold though pretty much stops all that, but picks back up where it left off by remixing the two streams further down in head ports. Arguable but it seems to work. I don't like the flow lost from the divider running down middle of all ports. It alone costs its area in more mixture that could have gone to engine. The effect will be pretty nominal on a pretty much stock engine though.

The whole split port idea there is negated by the use of a 1/1 carb, it was intended for progressive type carb. With both bores open at same time no need for the port dividers...... ..........mani fold was designed to run one bore open only most of the time.

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #17 on: March 11, 2014, 10:47:28 PM »
Very true, but for just going down the road it would work, wouldn't need a tall spacer 2" should clear the hood???..
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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #18 on: March 12, 2014, 03:02:38 PM »
The manifold pictured in the first post should have been the stock manifold, instead of the single plane they come with.

Running the same carb as Scott (jetted back to how it came to me atm), on the stock single plane, and getting 19 mpg at best. I can see separating the barrels being beneficial to low-rpm throttle response and mileage.

My car is an automatic, not sure about Scott's.

The mounting boss for the carb on the Offy intake looks tall. Does that actually clear the hood?

Offline Pinto5.0

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #19 on: March 12, 2014, 03:39:56 PM »
The bores are staggered but it shouldn't be an issue since I have 2 NOS 5200 Weber's to use on it. This is going on my 71 4-speed car with a mild cam & 4 into 1 header so I'm hoping for decent power & maybe 22 mpg. This will be my 1st 2.0L powered Pinto so it's going to be a quick learning curve. 
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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #20 on: March 12, 2014, 03:49:44 PM »
The bores are staggered but it shouldn't be an issue since I have 2 NOS 5200 Weber's to use on it. This is going on my 71 4-speed car with a mild cam & 4 into 1 header so I'm hoping for decent power & maybe 22 mpg. This will be my 1st 2.0L powered Pinto so it's going to be a quick learning curve. 

Honestly, I would love to buy that manifold from you. I didn't even know that a 2 barrel dual plane existed! :) You can have my stock one! :)

Offline Pinto5.0

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #21 on: March 12, 2014, 04:06:32 PM »
I'm curious about this one. I've never seen another like it. Open box plenum with 2 level runners. That should make them equal length but you gotta wonder about distribution issues.
 
http://www.ebay.com/itm/Weiand-7274-Pinto-intake-manifold-/261420426287?pt=Race_Car_Parts&hash=item3cdddf242f&vxp=mtr
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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #22 on: March 12, 2014, 04:19:42 PM »
I'm curious about this one. I've never seen another like it. Open box plenum with 2 level runners. That should make them equal length but you gotta wonder about distribution issues.
 
http://www.ebay.com/itm/Weiand-7274-Pinto-intake-manifold-/261420426287?pt=Race_Car_Parts&hash=item3cdddf242f&vxp=mtr

I see a 4-2 barrel adapter on the top, which would make the separation a moot point. I see a Holley pattern wide bolt pattern.

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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #23 on: March 12, 2014, 04:23:23 PM »
Those  were pure junk when they were new and I'm sure their no better now. Gas/air had to make a 90 deg turn after the carb. Not good.
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Re: Is the Offenhauser 2.0L dual plane 2 barrel version any good?
« Reply #24 on: March 14, 2014, 12:51:59 AM »
The higher plane has to make a pretty sharp turn. Manifold is still technically a single plane since ALL engine cylinders can still run from one bore. Just two single plane manifolds stacked on each other. Offy had to come up with a gimmick to offset their competition from Edelbrock, who usually kicked their butt all over the room. A true dual plane has half the cylinders pulling from one plane and the other half from the other.

At one time Offy offered a single plane in that casting with no divider at all and a Holley 500 two barrel fully open base mounting point for racing only. Hot Rod? magazine doing a story on 2.3s used it on a stage 3 engine with big .525 lift cam to put out 260+ hp. with no forced induction, but a race engine only, it didn't begin to make power till about 5000 rpm.