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Old 06-29-2008, 05:59 AM   #1
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Default Nitro Head clearance and Seal problem

Hey all.

What head clearance is needed for 20% nitro. I would like to check an engine i am working on..Team Infinity Samurai 521 modded

What method do you use to check your clearance? the solder in the glow plug hole method? anything better?

also is it ok to only have one 0.2mm alloy shim sealing onto a brass sleeve? no copper shim. I am thinking a shim may have been removed.

The engine has some dirt around the shim and on the underside of the head. The head was tight and sealed on the sleeve. the top of the sleeve was clean just dirty around the sleeve and under the head...

The sleeve and piston are not scoured at all.

This engine has been pulled down as it has been a pain to tune and idles up randomly and also the HSN needs to be almost all the way out for it to run ok.
I am guessing it was leaking somewhere or maybe short on shims...

If you lean it out even a little bit on the HSN, it lean bogs, sounds lean and gets hot.

thankyou all!
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Old 06-29-2008, 09:18 PM   #2
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Not sure what engine this is, but solder pinch the engine and make the clearance at .25in-.30in to be on the safe side.
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