<VV> High performance cooling

[Kent Sullivan]

Crawford,

$1000 for a complete Corvair engine rebuild is definitely the low end these
days; perhaps achievable if you're talking about stock-type parts and doing
most of the work yourself.

If you start talking about a serious performance engine with significant
non-stock parts and/or machining, the cost is much, much higher. I'm not
even sure what I have in my 3.1 liter, roller cam, Weber IDA-3C carb engine.
$7k at least I'm sure. Race engines? $10k is not out of the questions,
that's for sure.

Remember, the goal of the vertical fan project I described is not to make a
more efficient fan for near-stock Corvairs. It's for street performance
engines. This crowd (of which I am a member) enjoys pushing the Corvair
engine's performance limits while not abandoning longevity (no grenade
engines, thanks) or reliability (turn the key and go). I find this to be a
very interesting challenge but do not try to pretend that it is mainstream.

I have said this many times but it bears repeating: One thing I really love
about Corvairs and Corvair people is the wide variety of ways to enjoy the
hobby. I love the street performance aspects of my white coupe but I love
the keep-it-stock aspects of my yellow convertible just as much. (And very
soon, I will be experiencing what it's like to own/maintain a show car.)

Thanks.
-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Crawford Rose
Sent: Sunday, July 10, 2005 2:22 PM
To: Bill Elliott; virtualvairs at corvair.org
Subject: Re: <VV> High performance cooling

SNIP but adding an efficient fan (like possibly the vertical fan like we're
discussing here) would NOT change the basic character of the car and might
even lead to things like a reliable turbo engine that can run air
conditioning. These sorts of considerations are of concern to everyone
except purists and are not limited to the fastvair racer types.

Bill, wouldn't the additional cost of such modifications be much much more
than the actual potential damage it would attempt to prevent? I think that
even if my engine fried from "inadequate" cooling causing valve seat failure
and seized pistons, the cost would be less than $1000.  The cost of a
vertical fan conversion is? If Kent Sullivan and Bob Coffin achieve their
goal, will it be superior to employing other technologies such as employing
aluminum cylinders in place of cast iron cylinders with the stock cooling
system?

Some have mentioned that they desire fan belt retention at OHC type engine
speeds. At 7000 rpm, which appears to be the consensus goal of this project,
the Corvair valves are floating and other valve train damage is occurring
necessitating a rebuild within foreseeable expectations. Consider that the
redline of production OHC Porsches is 6,500 rpm, a more feasible goal would
visualize max fan performance at a more appropriate modified Corvair redline
of 6,000 rpm. Talk about grenade engines... I think we want to make that
Corvair powered Honda with VVT.

Crawford
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