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Old Sep 10, 2009 | 07:30 PM
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tareing the engine down to do sum port work and bumping up the compression to 9.6to1 the builder is trying to talk me into 10to1 is anyone having detination issues with 10to1 and will there be that much more gain with the higher compression ratio
 
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Old Sep 10, 2009 | 07:46 PM
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The tc96 is actually around 9.5:1 compression. Going to 9.6:1 would definitely be living life in the fast lane.

10:1 should be fine as long as you can get 93 oct gas in your area.
 
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Old Sep 10, 2009 | 08:37 PM
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With an Andrews 37 cam, you want to stay Below 10:1. That cam doesn't like compression higher than that. Mine is at 9.8:1 and it runs really good. In high humidity and 90 degree weather with 93 octane, I get a very slight ping when I roll on the throttle. My bike has a carb though.

I read somewhere that stock compression on a 96" was around 9.2:1 but I could be wrong.
 
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Old Sep 10, 2009 | 08:41 PM
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Red...9.2:1 is what is advertised by the moco. I believe in some chats with some head-guys (LMAO), they say it really works out closer to 9.5:1.
 
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Old Sep 10, 2009 | 08:52 PM
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That woudnt suprise me. I know the heads can very by a couple cc between a pair.
 
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Old Sep 10, 2009 | 08:58 PM
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If you do bump it up, be sure to have him install compression releases. Your starter will thank you for it.
 
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Old Sep 10, 2009 | 09:11 PM
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Yes! Definatly have the CR's done! Mine hates gas stops. It will kick back every time if I do not use the CR's
 
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Old Sep 10, 2009 | 09:14 PM
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I'm going with 9.6:1, I know I can get more power from higher compression but I don't want to take it to that level. My mild build will be more forgiving on cheap fuel,"sometimes ya gotta get what is available" run cooler and have less stress on my weak crank. Just how I want it for the FL. heat.
 
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Old Sep 10, 2009 | 09:38 PM
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Originally Posted by redrubicon2004
That woudnt suprise me. I know the heads can very by a couple cc between a pair.
Mine were 3cc different. The most my head guy ever saw.
 
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Old Sep 14, 2009 | 09:12 PM
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thanks, did some research and called andrews inc. at sea level (n.j.) i wont go higher than 9.8 and im thinking of bumping up to 103 ci. currently at 88ft lbs hoping to get close to 100
 
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