<VV> CHT Re: valve seats and "Ping"

[Mark Durham]

yes, also the amount of cooling that comes from a higher dynamic
pressure on top of the engine is not linear, meaning a much higher
pressure usually slows down cooling because a higher pressure burbles
out the bottom differently and actually changes the amount of cooling
that takes place. I did some conversions on aircraft to larger engines
which could require more air and often we would make the air inlets
smaller so the dynamic pressure was less, or changed the cowl flaps so
less air flowed out of the cowl, to get the right temps. So a bigger
capacity fan may not do anything.
Mark Durham

Sent from my Windows Phone
From: Ron
Sent: 5/16/2012 16:30
To: Mark Durham; J R Read; ScottyGrover at aol.com;
virtualvairs at corvair.org
Subject: Re: <VV> CHT Re: valve seats and "Ping"
That makes good sense.
RonH

----- Original Message -----
From: "Mark Durham" <62vair at gmail.com>
To: "J R Read" <hmlinc at sbcglobal.net>; <ScottyGrover at aol.com>;
<virtualvairs at corvair.org>
Sent: Wednesday, May 16, 2012 4:04 PM
Subject: Re: <VV> CHT Re: valve seats and "Ping"


> Scotty, yes, I have seen some where that gap is bigger than it should
> be. I simply adjusted the fan height by tapping the press fit shaft in
> the upper cover until the fan just cleared. Mark Durham
>
> Sent from my Windows Phone
> From: J R Read
> Sent: 5/16/2012 15:17
> To: ScottyGrover at aol.com; virtualvairs at corvair.org
> Subject: Re: <VV> CHT Re: valve seats and "Ping"
> Got pix?
> Later, JR
>
> ----- Original Message -----
> From: <ScottyGrover at aol.com>
> To: <virtualvairs at corvair.org>
> Sent: Wednesday, May 16, 2012 4:49 PM
> Subject: Re: <VV> CHT Re: valve seats and "Ping"
>
>
>>I have designed a series of fans for the purpose of improving the air flow
>> through a Corvair's engine. the problem with any of the factory stock
>> units
>> is  that there is too much space between the fan and the upper shroud
>> (turkey  roaster) which allows air to go back by the fan (the technical
>> term
>> is"reversion.")  my latest fan design involves a fan with blades which
>> rise  up
>> into the airstream and a "fan ring" which fastens to the turkey roaster
>> and
>> which minimises the gap between the fan and fixed-position parts.  This
>> allows less air to revert over the fan blades, keeps the air and the
>> pressure going through between the fins where it belongs.
>>
>> Scotty from Hollyweird
>>
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