<VV>lower shrouds (was Fan HP)

[JVHRoberts at aol.com]

Air cooled engines pretty much run open loop, when it comes to temperature  
control, and that includes Corvair engines. Once those damper doors go full  
open, there's no more control, and that is usually the case once warmed up. 
I also don't believe you can overcool and air cooled engine, especially a  
Corvair engine, unless you try VERY hard. And you won't do it using any of the  
stock cooling system components. 
Corvair engines, even without lower shrouds, warm up plenty fast enough.  The 
dampers are to allow the heater to warm up rapidly, not so much for engine  
temp control. 
And remember, 911s have ZERO temp control. No thermostats, no damper doors,  
nothing. And they have no issues with warmup, etc. They also don't tend to  
overheat, even the 400+ HP turbo models. And they sure aren't overcooled, even  
with those high volume, high pressure cooling fans!
 
 
In a message dated 6/27/2005 10:43:08 AM Eastern Standard Time,  
m.j.murphy at comcast.net writes:

For any  control to be fully effective it has to be able to work against  both
outside ends of the desired range.  It is possible to over cool  an engine,
just as it's possible to over heat one.  The engines run  "happier" when kept
in a certain temperature range.  The thermostats  are there to provide that
control -- shut when the temps are too low, open  when too high.  Removing
the shrouds removes that control on the low  end and while it does boost the
cooling, in some cases it can cool too much  with no way to bring the temps
up.  That said, I haven't had lower  shrouds on my turbo/PG 'vert since I
built it and I'm happy with the  results, but I run a manual choke, blocked
heater ports, and its purely a  summer car so the thermostats would be all in
all (99%+) of the time  anyway.