Forum > Your Pintos/Bobcats & Racers
Ranger RR Cam and Big valves? Worth it or not?
Wittsend:
I'd be curious to know the ramp difference of the RR cam to the slider cam. It might be like a NHRA "Stocker" cam that legally has factory lift and duration but a very fast ramp. This gets the valve to a higher lift compared with a stock cam at a similar point of duration. The roller would allow for that type of grind. If they had a similar LSA but the RR cam had a greater overlap it might be an indicator.
OK, whose got a degree wheel, a dial indicator and a lot of time on their hands..., anybody..., anybody,... anybody?
dick1172762:
This has been talked about many times at http://www.4m.net archives and yes its still a bucket of worms.
The Whistler:
I can tell you for sure the gains you will get from that combination are not worth the expense! Now add a custom cam and the right springs you have something! I would not waste mine or anyone else time with such a bad combination! Spending all that hard earned time and cash and Handicap it with stock cam REALLY! What are you thinking!
Wittsend:
Well, I'm not looking for ultimate HP. At 60 years old a stock T/C engine is enough for me. Being I have the small IHI '88 turbo high RPM breathing is not going to be a benefit. I just know a few years ago when I got my RR cam (and all 8 roller rockers) they were only $25 total at a Pick Your Part 50% off sale. So, I did not considered it a big expense.
Dick, I know the 4M site has a lot of info. I just don't recall if they ever mapped the lift at every 5 or 10 degrees and compared it to the slide cam. That is where my curiosity is. Does the ramp profile (for lack of a better term) "bulge" when compared to the slide cam??? Hopefully the drawing (yes, I have limited skills) will illustrate what I mean. Solid is the (assumed) slide cam profile and dashed is the (assumed) roller profile. The duration and the lift are equal but the speed (some may say abruptness) that the cam moves the valve to a higher lift occurs sooner though ultimately total lift is equal. Thus the potential to get more air/fuel in the cylinder but still retaining the characteristic s of a common lift and duration. This is what I'm wondering about the RR cam profile.
The Whistler:
Ok I see! The only benefit of the RR cam is it is a roller and it can be had for next to nothing! It is a good replacement for a stock slider that is it! I see what you are looking for and I hate to see you searching for a light at the end of this tunnel when there is none! But good luck you will find what all others before you have! I wasted my time when I could have been doing something better! Good luck and best wishes on chasing Internet Folk Lore! All of this has been debunked before. Since one or more of us does not understand this cam I will make it simple. The cam is a downgrade which is why it works the way it does, it was intended for a truck and better emissions. It will last longer than a slider cam. Do research you will find ford had a problem with slider cam failure for the entire life of the Lima and the roller solved this! So please keep us informed good luck and best wishes!
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