question on cams...

[speed127]

Hey everyone.... I was thinking on putting in some Crower stage 2 cams but was woundering if the notches in my piston heads would need to be made deeper since it is an interferince engine. I have had my head shaved but only to make it flat, and it was only very slight. Is anyone running these cams or has anyone had any problems? Thanx

 

[DSMcrazy3]

You shouldn't need any work done to pistons when installing cams. You should however go ahead and upgrade the valve train (springs and retainers). That way the stiffer spring will make up for the valve being open longer by snapping it back.

What do you mean you had the head shaved? Where it mates to the block? That shouldn't cause any problems either.

 

[Talon ESI-T]

Your pistons will be fine. As for a milled head, you may need cam gears to get the timing to line up properly. 10 Thous was removed from my head and the timing marks didnt line up properly, i had to adjust the gears to make up for it. Many people have found this to be true as well.

Terry

 

[DSMcrazy3]

Many people have found this to be true as well.

Did I miss something?

 

[Talon ESI-T]

Did I miss something?

I have no idea, did you?

 

[bullettdsm]

Shaved head .020 with 10.5 JE's. NO clearance issues. BTW should be at 15 flat next time at track. NA.
MB

 

[BigRand]

Some reading for thought. Since we're on the subject of cams

http://www.dsmtuners.com/forums/showthread.php?t=221242

 

[96gsdsm]

If it would make you feel better, Install the cams and after the motor is properly timed remove the spark plugs and rote the engine using the main crank bolt (clockwise only please) and listen to/ feel for any metalic noises or resistance. It's also a good idea to do this with the valve cover off so you can actually see whats going on in each cyclinder.

Rotate the crank slowly at first and if things feel good ... go a little faster the next spin around, do this progressively faster untill you have spun the crank a good 12 times

It's also a good note to remember that the cams spin 1/2 the speed of the crank. I.E. you spining the crank 12 times equals exactly 6 full cycles. After you've done this, double check your timing for accuracy and vuala!!

This however is only relevant in the event you do the work yourself. If a shop does it and screws up, it's their bum-bum!!