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Old 08-06-2006, 07:13 PM   #1
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Default What is the highest compression:

You should have if your thinking of putting a */C on a car? This is not realated to Bonneville'*, it'* actually for a small block chev. I always understood the */C car don't like high compression motors.


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Old 08-06-2006, 09:10 PM   #2
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It'* funny you ask that... High Performance Chevy has a new issue that deals almost exclusively with supercharging. If you're going for decent power numbers and want an all-around good driver, you'll want to be in the ballpark of an 8:1 compression ratio. The SSEi uses 8.6:1, and some guys put turbos or blowers on L36 bottom ends (9.4:1). If you get up much higher than that you won't be able to run as much boost, and if you get too low you'll have to make a ton of boost to make any power (which is sometimes not feasible based on the heat you would generate with a small pulley).

That'* just a general guideline... I certainly don't have firsthand experience with superchargers. But you might find it helpful to pick up that magazine and read up
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Old 08-06-2006, 09:51 PM   #3
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Euh, the Aurora has 11:1 compression. The higher the compression, the higher the grade of fuel is required (when no power adders ie SC or Turbo) is present.
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Old 08-07-2006, 11:53 AM   #4
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Quote:
Originally Posted by Jim W
Euh, the Aurora has 11:1 compression. The higher the compression, the higher the grade of fuel is required (when no power adders ie SC or Turbo) is present.
Jim'* motor is a good example of a case where you would probably not want to add forced induction. A static compression ratio of 11:1 would not be able to handle much boost without knocking or pinging.
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Old 08-07-2006, 02:47 PM   #5
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Thanks for all the info guys, much appreciated.
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Old 08-07-2006, 02:58 PM   #6
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Old 08-07-2006, 03:21 PM   #7
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that explains it very well, thanks Will.

Frank
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Old 08-07-2006, 03:24 PM   #8
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FYI, with the 2.0" pulley at 15psi with a natural compression ratio of 8.5:1 (Series 1 L67), I'm running an effective compression ratio of 12.5:1, which is fine due to the very high quality OEM head gaskets, cast iron block and cast iron heads. These 3800'* are ideally suited for this. Other applications may or may not be.
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