difference in hydraulic flat and roller cam?
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Senior User
Joined: Jan 2002
Posts: 368
Likes: 1
From: Texas
difference in hydraulic flat and roller cam?
hey, i am wondering if there are any other differences in the two cams other than anoticible power gain when using roller. as in life of the cam? fuel milege? i want to put a roller cam in my 351 but that would require some more work and money. Also would a 5.0 h.o. EFI cam work in a 351w EFI with the roller cam conversion conversion. thanks alot
Posting Guru
Joined: Mar 2005
Posts: 2,068
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From: western montana
cam life is supposed to improve- reduction in friction, better mileage. not sure about the efi stuff. The cost for a retro roller is probably over $800 by time it's done. I recently had a custom grind and it retailed for over a grand for k-kit. I was lucty get parts wholesale for $575.
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
because a roller cam uses a roller on the lifter instead of just a flat spot, the lobes can have a sharper and faster ramp allowing the valve to spend more time at full lift than a flat tappet cam for the same duration, and at full lift thier is more air flow, which means more performance without sacrificing drivability.
Elder User
Joined: Nov 2004
Posts: 726
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From: So. California
ON desktop dyno there are several ramp profiles:
Low acceleration
Typical OEM
Mild Accelleration
Medium accelleration
High accelleration
Max accelleration
I guess Max is an aggressive roller,High would be solid flat tappit, Medium is agrrssive hydraulic, Mild is stock hydraulic roller tappit motor like 5.0 Ho, Typical Oem is just an ordinary stock hydraulic flat tappit
I do not know but I am only guessing on every run, does anybody know?
thanks
Low acceleration
Typical OEM
Mild Accelleration
Medium accelleration
High accelleration
Max accelleration
I guess Max is an aggressive roller,High would be solid flat tappit, Medium is agrrssive hydraulic, Mild is stock hydraulic roller tappit motor like 5.0 Ho, Typical Oem is just an ordinary stock hydraulic flat tappit
I do not know but I am only guessing on every run, does anybody know?
thanks
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
you have the Max right but high would be a milder circle track type of roller or aggressive hyd roller, medium would be less agressive hyd roller or solid flat tappet, med would be an aggresive hyd, or typical solid or possibly a very mild hyd roller.
