<VV> Removal of Casting Flash

[Garth Stapon]

Just a thought.

There is lots of good discussion on cooling and fan options but not one 
comment on deflashing between the cast iron cooling fins on each cylinder to 
enhance cooling.

I seem to remember reading a previous article in the Communiqué that stated 
flashing removal is recommended, but do not recall if the cooling benefits 
were quantified.

Has anyone performed a before and after casting flashing removal comparison 
and realized any operating temperature differences?

Regards, Garth
----- Original Message ----- 
From: "Crawford Rose" <crawfordrose at msn.com>
To: <mhicks130 at cox.net>; <virtualvairs at corvair.org>
Sent: Monday, July 11, 2005 3:36 AM
Subject: Re: <VV> Corvair Fan


Mike, I'm sorry to differ but I never said it is the best possible design. 
The original design works well up to the designed speed of 4000 rpm.  The 
SAE papers claim that the design produces adequate air for the economy 
operation purpose of the Corvair and I agree.  The base Corvair engine is 
not a high performance engine and the cooling exceeded the as-designed heat 
rejection needs.  The improvements to increase horsepower were subsequent 
add-ons in 1961 and 1962 that were not originally designed into the motor 
in 1959 and thus there is no way to assert that there were compromises or a 
performance trade-off from the original cost program as you are claiming. 
Consider that there should have been a lot more additional R&D to meet the 
new heat rejection needs but apparently the various fans that employed 
curved vanes that were tested after 1961 were alternatively heavier or 
lighter but did not produce significantly more air volume.

Finally, everybody let's admit, imitation is the sincerest form of flattery. 
See the 917's 4.5 liter luftgekuhlte 12-Zylinder Boxermotor:

http://www.pbase.com/9146gt/image/22415610<http://www.pbase.com/9146gt/image/22415610>

Crawford
  ----- Original Message ----- 
  From: mhicks130 at cox.net<mailto:mhicks130 at cox.net>
  To: crawfordrose at msn.com<mailto:crawfordrose at msn.com>
  Sent: Sunday, July 10, 2005 4:22 PM
  Subject: Re: <VV> Corvair Fan


  The fan as used on our Corvairs is best possible design?  No way.  I 
stated that the fan had to meet the minimum requirements AND be cheap enough 
to put on a car and still make a profit.  Every part on a car has to do 
that.  GM is not a research center, they are a for-profit manufacturer. 
It's ALWAYS a balance between performance and cost.  The corvair stopped 
being built because it didn't make enough profit for GM.

  mike
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