compression calcs
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Road Master
Joined: Jul 2008
Posts: 849
Likes: 408
From: In the mountains
compression calcs
Greetings all. New here and would like some help. Want to verify compression ratio.
Here's the plan.
113" TC in a bagger
4.065" bore
stock reworked cyl heads with \\;89cc combustion chamber
4.375 stroke
R&\\;R .615 cams (47° intake close)
.030 head gasket
Flat top pistons-JE
When using a comp calculator do I list 2cc for the valve reliefs in the piston dome field?
Looking for 10.5:1 static and 9.3 or 9.4 corrected.
Am I close? Will this be a "ping monster"?
Any help greatly appreciated.
Here's the plan.
113" TC in a bagger
4.065" bore
stock reworked cyl heads with \\;89cc combustion chamber
4.375 stroke
R&\\;R .615 cams (47° intake close)
.030 head gasket
Flat top pistons-JE
When using a comp calculator do I list 2cc for the valve reliefs in the piston dome field?
Looking for 10.5:1 static and 9.3 or 9.4 corrected.
Am I close? Will this be a "ping monster"?
Any help greatly appreciated.
Novice
Joined: Jun 2008
Posts: 19
Likes: 0
From:
RE: compression calcs
Road Master
Joined: Jan 2006
Posts: 1,221
Likes: 40
From: Chester NY
RE: compression calcs
You will be fine. That cam loves 10.8 comp and it wont ping as long as the tune is in decent order!
Make sure deck height and squish is in order, get a good tune and you will never have a problem!
Make sure deck height and squish is in order, get a good tune and you will never have a problem!
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
RE: compression calcs
10.5 to 1, 47 degree intake close, good bathtub heads? CCP at 195. With the BB you should have plenty of quench.. If FI find a good tuner. Bike should run fine.
 \\;
Bruce
 \\;
 \\;
Bruce
 \\;
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