BearlyFunctioning
Seaman Apprentice
- Joined
- Apr 15, 2013
- Messages
- 43
I have a 1982 merc chevy 305 with a flat cam. My plan is to put a new cam in for now, crate engine later.
Current engine has compression of 143-151 psi, leak-down test of 6%, 10%, 10%, 12% through the rings, and 8%, 9%, 17%, 17% through rings and intake.
There two cams I am looking at spec out as follows.
Cam #1 advertised duration 278/288, lift .421/.444, duration @ .05 204/214, lobe separation 112.
Cam #2 advertised duration 270/278, lift .398/.421, duration @ .05 194/204, lobe separation 112.
Boat is a 1982 23' cruiser, fully loaded @ 5000lb, cruise rpm 3100-3700, sometimes (seldom)4400.
Which cam should I choose?
Current engine has compression of 143-151 psi, leak-down test of 6%, 10%, 10%, 12% through the rings, and 8%, 9%, 17%, 17% through rings and intake.
There two cams I am looking at spec out as follows.
Cam #1 advertised duration 278/288, lift .421/.444, duration @ .05 204/214, lobe separation 112.
Cam #2 advertised duration 270/278, lift .398/.421, duration @ .05 194/204, lobe separation 112.
Boat is a 1982 23' cruiser, fully loaded @ 5000lb, cruise rpm 3100-3700, sometimes (seldom)4400.
Which cam should I choose?
