Forum > It's all about the Turbo...
Ranger Cam for a 87 Turbo Coupe Engine for my '74 Pangra
Wittsend:
Ummm..., maybe not. If the later roller cam has a smaller lift (.2163) than the early roller cam lift (.2381) AND the same roller rocker ratio (stamped or cast) as many have stated how can the end result lift be the same???
Based on the fact that many are saying the end lift result is the same regardless the of early or late cams with their associated rockers then:
1. If the early/late cam lift is different then the early and late roller rockers HAVE TO HAVE different ratios.
2. If the early/late cam lifts are the same then there CAN'T be different roller rocker ratios.
Unfortunately information available states that cam lift and roller rocker ratios are different. Reliable information? Who knows? I've seem people argue that the total lift on the two roller setups are the same. And they argue that the rocker ratios are the same on the early and late roller rockers. Yet, they never dispute that the cam lift is different.
So, until I see pictures (or video) of a stock early roller setup and a stock late roller setup really showing the same total lift I'm skeptical of the "end result is the same" statements.
And until I see the early and late cams really having different CAM lifts I'll be skeptical.
And until I see the same, or different lifts with the early and later roller rockers on the SAME roller cam I'll be skeptical of roller rocker ratios.
To me a lot of people are talking - nobody is yet proving.
74 PintoWagon:
Hmmm, good point..
dick1172762:
--- Quote from: 74 PintoWagon on June 06, 2015, 09:35:05 PM ---Interesting read.. :)
http://www.4m.net/archive/index.php/t-318610.html
--- End quote ---
This is quoted straight out of the Ford shop manual. Word for word.
65ShelbyClone:
What is? The whole thread?
I hate to throw more fuel on an old fire, but I have seen plenty of big fat errors in factory service manuals. Honda published several in the '90s (and never changed them AFAIK) that show completely incorrect diagrams of how an engine's lubrication system works.
pinto_one:
I checked on the roller cams when collecting parts for my next project , came across a few things on the cams and roller arms , the site ranger station and a few others on the net , a few roller cams were diffrent and the roller arms were also , first sliders were 1.50 to one but do not care about those , first gen rollers were 1,64 , got those , last gen was 1.84 or 1.86 , but you have to widen the rails for the valve stem .061 for them to work on the older engines , got those also along with the cam, also got a bridge port to mill to fit , the cam i have is out of a ranger 2.3 along with the duel plug head , the other is out of a LRG425 industral (2.5 engine) which i got for the crank , NOT looking for high RPM horsepower , rather this engine will never see over 2700 RPM ever , unless I am in a dive , its going into a home built aircraft that was designed around 1929 using a for model A engine , A Pietenpol , I am looking for low speed torque , anything i get as long as it is over 50 HP a 2700 RPM will work fine , duel plugs like an aircraft , same weight a the old model A , plus side is this engine engine is very reliable , cheep and easy to take care of , I race them back in the late 70,s and you could not destroy it unless you drained the oil and water from it or hit a tree at sub light speed , figure in six months I will have it on a test stand to find out what combo works , advanced cam timing I will also try , got a adjustable cam sprocket , also the holes in the roller cam that lube the rollers are smaller which will help oil pressure , will post photos when up and running ,
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