<VV> Removal of Casting Flash
Garth Stapon
stapon1 at earthlink.net
Mon Jul 11 20:12:22 EDT 2005
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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