Head Clearance

[david cox]

I have a stock CMB 45 CAM Engine, purchased in 2008. This engine is used in a 45 Seaducer Mono, using 60% nitro and AB Parabolic pipe.

I have measured the head clearance using a small piece of silver solder, and the stock head clearance is .020". I measured the head clearance about 6 times using this method, and I get readings anywhere from .019 to .021 so the average works out to 20 thou.

Should I consider reducing this head clearance? I have read in this forum where others have their head clearance set at between 8 and 12 thousands of an inch.

Any suggestions?

Thanks,

David

 

[steve wood]

set it to .008 to .010

 

[Terry Keeley]

I run 0.012" on everything, sometimes down to 0.010" for the SAW stuff.

Much lower and I usually see a nice imprint of the squish band on the piston.

 

[david cox]

OK, thanks guys, I am going to reduce the head clearance

 

[Terry Keeley]

Can you just pull shims out or do you gotta do some cuttin'?

 

[J_Moore]

Mr Cox you got Text