<VV> cooling horsepower

[Ron]

Very good info, thanks.
RonH

----- Original Message ----- 
From: "Crawford Rose" <crawfordrose at msn.com>
To: <virtualvairs at corvair.org>
Sent: Wednesday, July 13, 2005 5:42 AM
Subject: <VV> cooling horsepower


> You may all recall the discussion of the cooling sufficiency of the stock 
> system.  I went back to read the SAE papers and the methodology that they 
> used. The data was based on the research that Chevrolet performed that it 
> takes 18 cubic feet of air  per minute per rated horsepower in 100 degree 
> ambient temps.  The airflow of the cooling system was 1850 cubic feet per 
> minute at 4000 rpm.  Peak horsepower of 80 hp requires 1440 cubic feet. 
> Curiously, that is similar to the rating of the later magnesium fan's 
> output but as far as the original design of the cooling system, it is 
> plain that 1850 cubic feet is adequate for the original engines by more 
> than twenty percent.  The math would indicate that 1850 cubic feet is 
> sufficient to cool to 102 horsepower. Therefore, the goal for 180 hp turbo 
> owners would have to be a implement a design that yielded at least 3240 
> cubic feet per minute to enable sustained max output. That is a lot of 
> air; more than twice the output of the magnesium design that 180s rely 
> upon.  I think that the fan would drain significant additional horsepower 
> to drive that much air through the cylinders at 4000 rpm.
> Crawford
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