10.1 compression in a Bagger
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Joined: Aug 2007
Posts: 57
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The way it works is fairly simple, the longer the duration on your cam, the more compression you can run without pinging. The reverse is also true, the longer the duration on your cams, the more compression you need. The engine builder is in a conflict, he may want more cam duration, so he needs more compression, but that could lead to pinging. If he reduces his compression without reducing the cam duration, then the engine will make less power but it won't ping. For every engine, there is usually an ideal cam timing that will result in the best acceleration times. If you build a high compression engine, the ideal cam duration will be longer than for a lower compression engine.
I can make this even simpler, keep your compression at 9.5 and ask for a cam that works with this compression. Raising your compression, and matching that compression with the ideal cashaft will increase your heat and the Harley engine is hot enough as it is.
I can make this even simpler, keep your compression at 9.5 and ask for a cam that works with this compression. Raising your compression, and matching that compression with the ideal cashaft will increase your heat and the Harley engine is hot enough as it is.
Extreme HDF Member
Joined: Nov 2006
Posts: 13,389
Likes: 26
From: Windham,Maine
You can run that kind of comp as long as you pick the right cam.Both of my bikes are over that 10:2.1 and 10:8.1,they are both strong runners and instant throttle responders
Good Luck
Good Luck
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101, 124, bagger, cam, compression, compresstion, davidson, engine, evo, harley, increasing, touring
