11:1 compression to high for a daily?
07-14-2007, 04:01 PM
#1
11:1 compression to high for a daily? was wondering if a compression ratio of 11:1 would be safe for the street. i've heard of a couple of people driving 11:1 head/cam combo's on the street, but never really heard of them daily driving it all of the time. would it be safe/stupid to run that high for on the street. i'm looking at the p/n 2033 Patriot stage II heads with 2.055"/1.57"/59cc and (already have) a patriot 226/226 .585"/.585" 112LSA cam and (will) toping it off with the LSX intake and a 78MM TB.
again just wondering if anyone runs that high of a compression for on the street as a daily driver, thank you!
again just wondering if anyone runs that high of a compression for on the street as a daily driver, thank you!
07-14-2007, 04:51 PM
#3
Originally Posted by reject
was wondering if a compression ratio of 11:1 would be safe for the street.
Originally Posted by reject
again just wondering if anyone runs that high of a compression for on the street as a daily driver, thank you!
07-14-2007, 05:59 PM
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Originally Posted by CoozePoodle
All depends on cam specs my good man.
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07-14-2007, 08:13 PM
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Originally Posted by reject
was wondering if a compression ratio of 11:1 would be safe for the street. i've heard of a couple of people driving 11:1 head/cam combo's on the street, but never really heard of them daily driving it all of the time. would it be safe/stupid to run that high for on the street. i'm looking at the p/n 2033 Patriot stage II heads with 2.055"/1.57"/59cc and (already have) a patriot 226/226 .585"/.585" 112LSA cam and (will) toping it off with the LSX intake and a 78MM TB.
again just wondering if anyone runs that high of a compression for on the street as a daily driver, thank you!
again just wondering if anyone runs that high of a compression for on the street as a daily driver, thank you!
07-14-2007, 10:07 PM
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Static Compression Ratio often referred to as Compression Ratio is not the primary determining factor for engines running on a predetermined octane fuel.
Dynamic Compression ratio is the major factor!
The later the intake valve closes ABDC, the less air fuel mixture is trapped in the cylinder. This in sense lowers the compression ratio. This is also why large cams with stock rotating assemblies have more advance ground into them.
In fact Toyota has a 1.5L engine on a production vehicle that has a 13:1 SCR and runs on regular unleaded. High Static Compression Ratio does not always mean it requires high octane fuel.
Dynamic Compression ratio is the major factor!
The later the intake valve closes ABDC, the less air fuel mixture is trapped in the cylinder. This in sense lowers the compression ratio. This is also why large cams with stock rotating assemblies have more advance ground into them.
In fact Toyota has a 1.5L engine on a production vehicle that has a 13:1 SCR and runs on regular unleaded. High Static Compression Ratio does not always mean it requires high octane fuel.
Last edited by Dragula; 07-14-2007 at 10:18 PM.
