Piston to valve clearence issues ? M42 Gods ?

Post Thu Feb 28, 2008 4:37 pm

what is the piston to valve clearence on a standard m42 engine

IE . . . At tdc how far can you push the valves down before piston contact .

Thanks guys Please say someone knows the answer to this !!

Post Thu Feb 28, 2008 4:58 pm

Mods may have posted this in the wrong section tech help maybe ?

Post Thu Feb 28, 2008 8:21 pm

No i'd say the engine swap section is where you'll get the most sense...

Jai

Post Thu Feb 28, 2008 8:24 pm

Is this for your choice of camshafts?

Post Thu Feb 28, 2008 8:35 pm

Arron, I would post up on M42club, they seem alot more clued up on these engines.

Also, Tim_S may know also.

Post Thu Feb 28, 2008 8:42 pm

tim s is building the engine / head for me and he is not sure what the wildet cam i can get away with is guys , i spoke to piper cams and basically there are idiots they dont have a clue what an m42 engine is let alone make cams for it they tried to sell me a 295 cam for an m40

so called cat cams very helpfull indeed i am going to be uprating the valve springs and want to know basically what the most agressive / wildest cam i can get away with before i have to poket pistons , or chage to mechanical lifters

yes jamie it is for cam choice ! why you ask dude ?

shep cheers dude i have done that and asw of yet still no reply !

ill wait thats all i can do other than spunk the money on th wild one to find it does not fit ! lool

thanks for everything so far

Post Thu Feb 28, 2008 8:45 pm

Are you going for higher compression pistons? If ou are changing them, you could get them more pocketed to compensate for any higher lift/duration cam. Also, with higher CR the cam will work better.

Post Thu Feb 28, 2008 8:50 pm

no not toucing the bottom end yet the plan is to do this to get me threw

then me and tim hopefully will bench build a screamer of a n/a m42 over time !!!

so just the best cam i can get away with for now just changing the springs and running the itb's should see an ok (ish) gain ?

Post Thu Feb 28, 2008 9:43 pm

you had a look on the catcams website ? its got loads of info about what u need to change with each of there cams not sure if its got clearances tho got every thing else

Post Thu Feb 28, 2008 9:46 pm

hmm really i have spoken to cat cams but not acctually been on their web site , the guy at cat camsasked me what the clearence was so he could decide what the best cam was lool