Calculate Compression?

[V24me]

Can anyone tell me my compression - 95", SE heads off the shelf, .030 cometic, 9.25-1 flat top pistons. 
thanks for any help.

[dohmixer]

check out this thread http://harleytechtalk.net/htt/index.php?topic=439.0

[V24me]

05,
yep it is the Hippo build with 570 gear drives, mik 42 carb and fatcat exhaust

[maineultraclassic]

No real way to tell for sure.

You need to have the head's chambers measured to see what they are, you need to measure the deck height of the pistons to see if you are positive or negative.

That's the only way to know for sure what CR you'll be at.

Steve

[roadglide65]

Take the time to have the heads cc and check the deck height.

My S/E PRO heads were 84cc and they are supposed to be 76 to 78 cc. Make's a difference!!!

[bouncingVman]

Try this... I just learned how to post files today. This ones from the old HTT.

<a href="http://bouncingVman.fileave.com/Compression%20Calculator%201_17_06.xls">http://bouncingVman.fileave.com/Compression%20Calculator%201_17_06.xls</a>

Sounds like you need to know what your heads CC at. and maybe also your piston dome height for this calculator to work.

[V24me]

Thanks for all the help.  I'm trying figure out if it's below 10.5-1, but sounds like there is no way to know with motor together. 

[randallwhitman]

Correct.  All you can do is guestimate.