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Re: Re: Re: Re: Benefits of higher compression?.
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Posted by Ron on June 27, 2004 at 03:05:35 from (69.179.4.15):
In Reply to: Re: Re: Re: Benefits of higher compression?. posted by Neil on June 27, 2004 at 00:04:40:
The problem with theories is that they aren't real. For example, aeronautical engineers use certain "theoretical formulas" to determine flight characteristics. Problem is, according to them, bumblebees cannot possibly fly. Good thing the bumblebees don't know that! Remember that the next time you fly; these are the same guys that designed your airplane. Even back in the '60's during the muscle car era engineers got 10% torque improvement per point of CR increase. Like I said, it's a very general rule, subject to lots of factors. One factor that entered into this that 104 octane gas was available anywhere. As you moved up the CR scale, you got those excellent gains because the high octane prevented knock and therefore power loss. There were some muscle cars than ran CRs as high as 11.5:1. Another example: the perfect blower motor has a static CR of 8:1 or so. By adding 6-8 lbs. of boost, most supercharger manufacturers will claim a 30% boost in torque... and it just so happens that 6-8 lbs. of boost raises the combustion pressure to about the equivalent of an 11:1 compression ratio. Remember, engines don't "see" compression ratio. They see cylinder filling and therefore combustion pressure.
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