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Sportster Motorcycle Drag Racing Discuss drag racing on a Sportster Motorcycle.

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  #1611  
Old 2 Days Ago
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rejeanprimeau rejeanprimeau is offline
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Weird that the new technology still make it go back to Iron Head, those piston almost look like IH ones. LOL.
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  #1612  
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Originally Posted by rejeanprimeau View Post
Weird that the new technology still make it go back to Iron Head, those piston almost look like IH ones. LOL.
Not too weird.... You cannot make compression in a 70cc combustion chamber with a flat top piston. Especially with the smallish diameter of our pistons. A SBC or SBF has a 4.00 bore and 57 to 62 cc chambers that net 9.0 to 10.0 compression... At 3.565 it even more difficult to make more than that with a minor dome.

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