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HarleyTechTalk

Technical Forums => Iron Head => Topic started by: 1972XlchBobber on March 10, 2009, 08:15:08 PM

Title: Normal Compression
Post by: 1972XlchBobber on March 10, 2009, 08:15:08 PM
OK, I bought this basket case 9:1 compression 1972 Ironhead last fall, finally got the transmission installed and got to do a compression test.

I got 123 psi in both cylinders taken Wide open throttle, cold, no choke, with airfilter. 

What would be normal for a 1972? 

Any references?

Thanks, Mike
Title: Re: Normal Compression
Post by: IBARider on March 12, 2009, 07:48:24 AM
i don't have any references off hand... but that sounds good enough to run it and see.  i defenitely wouldn't tear down top end for numbers like that.  One thing that strikes me, how did you get exact same reading?  They should be close, but I wouldn't expect the same on both, unless your gauge just happens to stop there......
Title: Re: Normal Compression
Post by: dirtywhitewalls on March 12, 2009, 11:02:12 AM
i agree with ibarider. not sure on least acceptable numbers, but consistency is what your looking for, I'd run em.

mike
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