os speed shimming ??

Old 12-29-2010, 12:36 PM
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Default os speed shimming ??

I HAVE AN OLDER MODEL SPEED ENGINE AND WANTED TO KNOW THE THINKNESS OF THE SHIM NEEDED TO RUN 25% NITRO...
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Old 12-29-2010, 12:59 PM
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Originally Posted by addicted427 View Post
I HAVE AN OLDER MODEL SPEED ENGINE AND WANTED TO KNOW THE THINKNESS OF THE SHIM NEEDED TO RUN 25% NITRO...
For the older OS engines they should have a total of 0.012" / 0.3mm worth of shims. Giving you a NET head clearance of 0.016" / 0.4mm. With this shimming your good for 30% Race Fuel with 7%-11% oil content in the USA.
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Old 12-29-2010, 12:59 PM
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Same imfo...

Last edited by gabor szilagyi; 12-29-2010 at 01:01 PM. Reason: Same post..
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Old 12-29-2010, 02:31 PM
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Originally Posted by EBMods View Post
For the older OS engines they should have a total of 0.012" / 0.3mm worth of shims. Giving you a NET head clearance of 0.016" / 0.4mm. With this shimming your good for 30% Race Fuel with 7%-11% oil content in the USA.
I'm running 25% Byrons. Not 30
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Old 12-29-2010, 02:32 PM
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Originally Posted by addicted427 View Post
I'm running 25% Byrons. Not 30
Your good for 25%
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Old 12-29-2010, 02:52 PM
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Originally Posted by EBMods View Post
For the older OS engines they should have a total of 0.012" / 0.3mm worth of shims. Giving you a NET head clearance of 0.016" / 0.4mm. With this shimming your good for 30% Race Fuel with 7%-11% oil content in the USA.

What would be the diff of running 0.010 and 0.015 shim

Just trying to learn a bit.

Thanks
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Old 12-29-2010, 04:10 PM
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With less shim (thinner shim) you will have more compression ,more pressure on conrod,maybe a little more chance to blow the glow plug ,however 0.05mm diff not too significant...The way how we do here (with 25%-30 nitro) we leave the 2 copper shims with the alu shims during the brake in and about 1 gallon we remove one of the copper shim....
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Old 12-29-2010, 04:27 PM
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Originally Posted by addicted427 View Post
What would be the diff of running 0.010 and 0.015 shim

Just trying to learn a bit.

Thanks
If you can please be more specific about your question.
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