<VV> Another Q about shrouds

[JVHRoberts at aol.com]

>From my own personal experience with two turbo Corsas and one Monza with a 
110 and a Corsa dash, even in the dead of winter and no shrouds, the engines 
would warm up in several minutes to make the CHT get off the lower end and get to 
at least 250-300F. 
With the shrouds and Tstats, ALL of my Corvairs had fully open doors after 
several minutes of driving. The only time they would close at all while the 
engine was running was during prolonged idle at sub freezing temps. 


In a message dated 2/5/2005 7:46:02 PM Eastern Standard Time, 
lonwall@corvairunderground.com writes:
To chime in on this subject - From all I can gather, if your ambient 
temps are over 80 degrees then there can be a noticible benefit to 
removing the lower shrouds (I do it myself on most of my summer 
Corvairs). BUT it should not be understated that having them off when 
the temps are lower than that, not only provides no benefit, BUT can do 
bad things to the engine. If it's under 80 degrees (like right now in 
Oregon) the shrouds NEED to be there. Not only will the heater work very 
poorly but the engine will almost NEVER reach proper operating 
temperature. That means you'll build up deadly moisture in the engine 
and reduce your lubricating efficiency.

A comment was made that if you disabled the cooling system on a Corvair 
engine the engine will eventually overheat, no matter what the ambient 
temp - and that is true. The implication being that haveing the lower 
shrouds off - even in cold weather - will not prevent the engine from 
warming up - eventually. Not true. The lower shrouds have nothing to do 
with the cooling design of the motor. The lower shrouds serve as 1) 
heater collection boxes and 2) the most efficient method of heat 
re-circulation in cold weather. How do we know they are needed in cold 
weather? Because on most Corvairs if it's under 60 degrees ambient you 
can run the car all day and neither of the damper door t-stats will ever 
open.

When it's cold - no heat recirculation - no proper operating temps.  Lon

www.corvairunderground.com
PORTLAND IN JULY!   www.corsaoregon.com