What can I expect from headporting?
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Joined: Jun 2006
Posts: 95
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From: Istanbul Turkey
Hahaha. Maybe I can get a good price from him with my screen name
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Your name reminded me. He retired not long after doing a major rebuild of my bike. One friend reckons he was able to on the profits he made from me! 
Road Warrior
Joined: Nov 2007
Posts: 1,984
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rough rule of thumb.
1 point of compression ratio increase, all other things being the same, will raise HP 2 HP per cilender.
So a late model at 9.5cr to 10.5cr yields 4 HP.
Rarely do folks do only CR increase onle. Just not labor and cost effective.
But, IMO, the HC pistons can be in the way of getting the most from the heads. For the street. Must take care with these.
1 point of compression ratio increase, all other things being the same, will raise HP 2 HP per cilender.
So a late model at 9.5cr to 10.5cr yields 4 HP.
Rarely do folks do only CR increase onle. Just not labor and cost effective.
But, IMO, the HC pistons can be in the way of getting the most from the heads. For the street. Must take care with these.
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