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cam to big ?
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63chevy
New User
| Posts: 9
| Joined: 09/08
Posted: 09/07/08
10:25 AM
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I built a 383 replaced solid z-70 dur-304 cam lift 365 valve lift 548. dur-@50 264 for roller went with comp 12-908-9 changed all springs retainers lifters ect.heads are iron eagle 205/164 have not checked vacume yet what should I have?
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JW454
Enthusiast
| Posts: 345
| Joined: 07/08
Posted: 09/07/08
04:39 PM
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What's your static comp. ratio? What are the specs. on the roller cam?
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63chevy
New User
| Posts: 9
| Joined: 09/08
Posted: 09/08/08
06:47 PM
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roller specs are gross valve lift int-630 ex-630, tappet lift int-300 ex-308, timing open int-44 ex-80 closed 76 48 dur-@ 50 int- 264 ex-270 lobe separation 106. how do I find static comp ratio? thank you
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63chevy
New User
| Posts: 9
| Joined: 09/08
Posted: 09/08/08
07:34 PM
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If I did this right I came up with 16.72 with thickness of gasket. without gasket it is .000 decked and is 18.65, does this sound right? new at this any help greatly appreciated thank you
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63chevy
New User
| Posts: 9
| Joined: 09/08
Posted: 09/09/08
03:02 PM
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any help appreciated
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JW454
Enthusiast
| Posts: 345
| Joined: 07/08
Posted: 09/12/08
04:11 AM
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All the volumes mentioned have to be converted to cc's. Comp. ratio = Combustion chamber volume, - piston dome volume, or + piston dish volume ( you did not specify what you had ), + head gasket volume, + deck height volume, you stated zero deck height, so that figure is zero. + swept volume ( cylinder displacement in cc's ). Divide this figure by, combustion chamber volume, - or + piston dome, or dish volume, + head gasket volume, + deck height volume. This will give you your static comp. ratio. When you come up with the figure, post it and I will give you the "theoretical" cam choice.
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63chevy
New User
| Posts: 9
| Joined: 09/08
Posted: 09/12/08
07:35 AM
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on a static compression calculator Icame up with 18.65 thank you jw454
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