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Old 10-16-2003, 07:48 PM
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head

going from 76cc heads to 64cc could you make any power with flat top pistons
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Old 10-16-2003, 09:38 PM
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You will up your compression which will make the motor more responsive and add some mid range hp.
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Old 10-16-2003, 11:31 PM
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The smaller combustion chamber is more efficient. A flat top piston is the most efficient. People think dome pistons make more power. No way. They are an airflow restriction. Use the 64cc head.

What is your compression going to be with 64cc's? Go on Keith Black's website. Use the compression ratio calculator. Make sure you have all of the variables right. The reason I ask is because if your compression is going to be above 10:1, you will need to bleed a little pressure off with a bigger cam then you were talking about in your previous posts. I'll give you an approximate recommended cam size, and then you should double check with one of the techs at the brand of cam you choose.

Last edited by lluciano77; 10-16-2003 at 11:31 PM.
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Old 10-19-2003, 01:17 AM
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Keith Black site ( www.kb-silvolite.com ) is under construction & unavailable. The same info (from the old KB catalog) is at http://www.beckracing.com/1toc.htm

Check out the "technical stuff" for lots of good info. The Bench Racing segment has a list of compression ratio recommendations as related to cam, etc.
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Old 10-19-2003, 10:12 AM
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People think dome pistons make more power. No way. They are an airflow restriction. Use the 64cc head.


I think your under the wrong impression, Dome pistons may not have as good as flame travel, yada, yada, but for a given CID, with everything else being the same, a Dome will make more power & torque.. ( and also rev quicker) I use the Domes Because I run Nitrous, I wont go into detail, For the street, Id use flat tops..You really dont need domes to produce alot of power with the heads available today, both have there advantages and disadvantages. Domes arent a Air Flow Restriction...
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