<VV> CHT Re: valve seats and "Ping"
ScottyGrover at aol.com
ScottyGrover at aol.com
Wed May 16 17:49:08 EDT 2012
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
.
In a message dated 5/16/2012 10:21:02 A.M. Pacific Daylight Time,
62vair at gmail.com writes:
John, there is more to it than a more efficient fan design. The
production fan, while terrible does provide the required pressurized
air in the box on top of the cylinders for adequate cooling. I am not
an engineer, so cannot spout the data to prove or disprove the need for
a more efficient fan, because all it needs to do is to provide the air
pressure to move the air through the cylinders and oil cooler. A more
efficient fan may not improve cooling because there are other
limitations to the system like fin design on the heads and cylinders,
lower shroud design, and others. The fact that accessories like the
Otto adjustable pulley which changes the fan speed, lowers it, tells me
the fan produces plenty of air for cooling, given the system design.
Mark Durham
Sent from my Windows Phone
From: jvhroberts at aol.com
Sent: 5/14/2012 18:19
To: FrankCB at aol.com; patiomatt at aol.com; virtualvairs at corvair.org
Subject: Re: <VV> CHT Re: valve seats and "Ping"
But did you REALLY need a gauge to tell you there was a problem? Of
course not.
And Tom had better cooling. A LOT. The problem with Bonneville is the
power is on for a long haul. Alas, the engine can't store that much
heat, like it could in a drag strip run, so, something more was
needed. And yes, as awful as water injection is, it does provide
improved cooling, well, as long as the tank holds out.
And yes, a better fan would offer better cooling. Of course, the
silver lining here is, the stocker is HORRIBLE, so, any well designed
replacement will beat the stocker hands down. And obviously,
intercoolers are a proven technology, and that's why all turbo cars
made today have at least one, and none have water injection!
John Roberts
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