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hellion_locdogg
 Post subject: Compression ratio, again
PostPosted: Mon May 10, 2010 9:30 pm 
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Posts: 317
Location: Phoenix, AZ
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So I have my (75'-80') head in the shop getting 1.44 1.70 valves put in. After that we will cc the head, guessing avg of 60cc. so using a calc these are my figures, am I missing something?

What I have:
60 cc (guestimation)
3.440 bore
.175 deck
Felpro 3.5 & .037
stock stroke 4.125

= 8:1

I would like 10:1 and that means .100 (45cc) off the head and .045 off the block. I also have a Clifford 264 cam, 1.5 stock adj rockers w shorter push rodsand yes, damper dual springs.

,Cliff

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Last edited by hellion_locdogg on Mon May 10, 2010 10:06 pm, edited 1 time in total.

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Joshie225
 Post subject:
PostPosted: Mon May 10, 2010 9:48 pm 
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Supercharged
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Location: Portland-ish
Car Model: Fiat 500e
Stroke of a 225 is 4.125". You do have a 225 correct?

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hellion_locdogg
 Post subject:
PostPosted: Mon May 10, 2010 9:58 pm 
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Yes and I'm a ritard that is why I asked... LOL Thanks let me change some numbers then and see where I'm at.

Thank you much Josh!

,Cliff

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hellion_locdogg
 Post subject:
PostPosted: Mon May 10, 2010 10:04 pm 
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Ok, so this is where I'm actually at 7.8:1. So .100 off 60cc is 45cc and .045 off the block puts me right at 10:1. Glad I asked, now I can bookmark this page.


,Cliff :wink:

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Doc
 Post subject:
PostPosted: Tue May 11, 2010 8:26 am 
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Location: Working in Silicon Valley, USA
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If milling both the block and the head, I would take the heaver cut off the block & leave the head as thick as possible. (the block is a bigger, thicker, more stable piece of cast iron so it takes the heavy cut a little better)
DD
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hellion_locdogg
 Post subject:
PostPosted: Tue May 11, 2010 12:20 pm 
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Thanks Doc!

,Cliff

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