<VV> Re: VirtualVairs digest, Vol 1 #1736 - 8 msgs

Ron ronh@owt.com
Sun Feb 6 18:53:47 EST 2005


The Coates certainly looks interesting but they will have the same seal 
problems as the Wankel had.  It's hardly been tested, so far, so time will 
tell.
RonH

----- Original Message ----- 
From: <kenfran@comcast.net>
To: <virtualvairs@corvair.org>
Sent: Sunday, February 06, 2005 3:25 AM
Subject: <VV> Re: VirtualVairs digest, Vol 1 #1736 - 8 msgs


>I know it will probably be viewed as a wild idea, but I think that the 
>ideal
> solution would be to eliminate the pushrod tubes, the pushrods, the cam, 
> the
> rocker arms, and the tappet valves, and convince the patent-holder on the
> Coates rotary valves to produce a rotary-valve head for the Corvair, or at
> least allow his patents to be used to help publicize his technology..
> http://www.coatesengine.com/photo_gallery.html
>
>> While I think the quantity of oil coming from the head area to the block
> on a street car is minimal , keeping the  radiant and convective heat from
> the exhaust pipe/ manifold away from the pushrod tubes, and the oil 
> therein,
> is justified.
>> This is from the point that any temperature over 350 degrees will break
> down the oil into varnish products , decreasing the lubricity and life of
> the oil.This condition certainly can exist in the pushrod tube near the
> exhaust tube.Especially on Turbo engines.
>> Also, for a race application , where higher temperatures are involved at
> both the exhaust port [1250-1300 degrees] the oil in the tube is subjected
> to even higher temperatures for a longer period of time making the problem
> worse for the oil.
>> And, sometimes, head temperature[and the air coming from them] is close 
>> to
> 400 degrees, further aggravating the situation.
>> Add cornering forces that push large quantity of oil back and forth
> through the tubes , and it becomes obvious why racing Corvairs need extra
> oil cooling capacity to maintain proper oil operating temperatures.
>> Finally , on my race engines , I have seen a measurable oil temperature
> reduction by coating the outside of the pushrod tubes with red high
> temperature RTV silicone rubber on at least the outer 1/2 of the tubes, as
> an insulating medium.
>> I did this in the late seventies when I was racing my D/Production Yenko
> Stinger , and on most performance engines I have built since then. I would
> recommend doing it routinely on any High Performance Corvair Engine.
>> Bob Coffin
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