T O P I C R E V I E W
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79 cobra
Member # 10137
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posted
What the highest you think I can get away with 91 oactane plan on buying new rods and pistons but want the higest compression with out denoting was thinking either 11.1 - 11.8 [ 2014-04-15, 06:14 AM: Message edited by: 79 cobra ]
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5.0 LsX
Member # 10017
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posted
what motor? what heads? what cam?
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Tom Renzo
Member # 13165
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posted
Depends on the CAM!!!!
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4IDFOX
Member # 9921
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posted
quote: Originally posted by Tom Renzo: Depends on the CAM!!!!
What Tom said.
Dynamic (cranking) compression is what matters. And that is controlled by the cam timing events. You could have a 12:1 motor that will run on 91 and a 10:1 motor that will not because of the cam timing events.
The motor in my road race car is a flat top piston 306 wit 58cc heads. That is about a 10:1 motor. But with the custom cam I run I have 196# of compression from a 10:1 motor. [ 2014-04-15, 08:50 PM: Message edited by: 4IDFOX ]
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79 cobra
Member # 10137
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posted
Gonna be a 5.4l with c heads and comp stage 3 nitous cams and heads are 52 cc
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Tom Renzo
Member # 13165
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posted
Need specks on cam.
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Vndcatr
Member # 2343
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posted
quote: Originally posted by 79 cobra: Gonna be a 5.4l with c heads and comp stage 3 nitous cams and heads are 52 cc
Quick question on your build setup.. I see you have the 52cc 03/04 heads, Which piston are you using? [ 2014-04-16, 05:22 PM: Message edited by: Vndcatr ]
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79 cobra
Member # 10137
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posted
Going with manley pistons and h beam rods
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79 cobra
Member # 10137
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posted
Got a deal on a 98 cobra shortblock going to buy rods and pistons but still need to know if 11.1 will work going to be a c head motor with stock cams
Thanks , Brett
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Tom Renzo
Member # 13165
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posted
Depends on the cam!!
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79 cobra
Member # 10137
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posted
Going to use the stock cams from my mach 1
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Fostang
Member # 3752
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posted
http://cochise.uia.net/pkelley2/DynamicCR.html
Educate yourself
Heres a decent calculator to assist you
http://www.projectpontiac.com/ppsite15/compression-ratio-calculator [ 2014-04-28, 10:41 AM: Message edited by: Fostang ]
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