Separate names with a comma.
Posted by treebonker, Nov 4, 2008
Cylinder Head & Short Block - 4G63 cams, valvetrain, pistons, rods, stroker kits, 6-bolt swaps, hybrids, etc. Read this Forum's Strict Guidelines.
Why was this left out?
Talk to any cam grinder, engine builder, or racer and youll find overwhelming agreement that degreeing-in a camshaft is a vital step along the route to optimum engine performance. At first that may seem strange because degreeing-in a cam pertains to checking the accuracy with which it was manufactured.
The purpose of degreeing a cam is to insure that the cam is phased correctly with the crankshaft, per the cam manufacturers specifications. Youre insuring that valve opening and closing events are in accordance with specifications, regardless of the cause. Actual valve opening and closing events are influenced not only by accuracy with which a cam was ground, but also keyway position in the crankshaft, crank timing sprocket, dowel pin hole position in the cam sprocket, and accumulation of machine tolerance also play a major role.
It is the exception, rather than the rule, that a cam may be out of phase, but this should be established to insure an accurate performance baseline or point of tune. There are however 4G63 Eclipse cam manufacturers that make it a rule rather than the exception. But nobody cares as long as it's cheap and you got that cool lump-lumpity-lump idle.
But I have a few questions. Will dialing in have any effect on stock camshafts? Also, do you think it is possible to do this procedure with the engine in the car?
Why doesn't anyone sell a kit with 2 solid lifters, or something pre-assembled to do this with? I think an enterprising individual should add some DSM-specific parts to that generic degreeing kit and make some $$$
Until then, does anybody have links to some decent inexpensive kits (that you have experience with) ?
im looking to get cams, and have a shop that will do them, might print this out.
And finally, where can I find instructions on removing/installing springs and retainers? (Interest for both that light feeling spring and for future upgrades on springs)
Fantastic write up. Haven't come across a post of this caliber in a while.
So the purpose is to make sure the lifter is totally secure, so that the rocker has a solid point to pivot against and the springs/retainers/valves move 100% with the lobe?
Exactly....Can't think of a better way of putting it.
) lifters back in.
I don't have the links handy, but there are several threads floating around here that talk about the negative effects (or at least the lack of any benefit) of running solid lifters in our motors.
4G63 Camshaft Degreeing
For example I just degreed my first set of kelford cams and was trying to degree them at .050 lift measurments nothing was coming out corrently.
I found out on there web site there mitsubishi cams are desighed to be degreed at .040 lift or 100mm.
This was all new to me because all the american made cams are desighed to be checked at .050 lift.
My cams both intake and exhaust are now 7/8 of a degree retarted to get the correct lift at .040 reason being so is my head has been decked so many times as well has my block has been decked once.
I used 2 BLE solid lifters and the the morroso pro wheel.
Usually the kelfords are right on the money.
I do beleive the HKS cams are also desighned to be degreed at .040 lift as well.
If your not sure call or email the cam maker.