<VV>Fan HP

[Ron]

Actually, the top engine components run much cooler than the enging block, 
barely warm to the touch while climbing mountain grades.  All you have to do 
to find out is to open the engine doors on an Ultra Van and feel for 
yourself.  I've done it.
RonH

----- Original Message ----- 
From: "Padgett" <pp2 at 6007.us>
To: "Ron" <ronh at owt.com>; <virtualvairs at corvair.org>
Sent: Sunday, June 26, 2005 7:59 AM
Subject: Re: <VV>Fan HP


>
>>The reverse flow concept would kill one of the best features of the 
>>Corvair design and that is the downward flow that keeps all of the top 
>>engine equipment at near ambient temperature, the carburetors, alternator, 
>>distributer, etc. all run cool and trouble free.
>
> Actually these all run near the engine case temp - conduction works much 
> better than convection and why the alternator has its own fan. OTOH an air 
> dam behind the axles to channel high(er) pressure air into the engine 
> compartment  and create a lower pressure area under the engine would be 
> very beneficial.
>
> I suspect that this is why removing the lower shrouds does not always 
> help, particularly at higher speeds: the shroud itself with its rearward 
> facing exit will put the opening in a pressure flow area that will use the 
> momentum of the air around it to help extract the exhaust air. Remove the 
> lower shroud and this will be lost. I suspect that removing the shroud 
> will help below 40-50 mph and hurt above that.
>
> Have there ever been any manometer tests of the pressures at various 
> speeds above and below the shrouds ?
>
> Keep in mind that much of the Corvair design was lifted from the VW which 
> had an entirely different shape, much smaller engine, and lower design 
> speeds. I wonder what the underside of a 356 Porsche looked like ?
>
> My Westphalia had a monster RVEECO oil cooler on the side that really 
> worked. Had no temperature issues even crossing the Rockies and Cascades 
> in summer. Did need all of the gears though.
>
> Padgett
>
> still looking
>
>
>