<VV> Head Temp

[J R Read_HML]

Tony,

This question has been up before and I was surprised by some of the high 
numbers I saw - like around 500 and above.  For me (a 140 LM convert with 
shrouds off), I can cruise at highway speeds for hours and stay right around 
375.  Might hit 400 on occasion like a longish uphill or strong headwind. 
I'm in the Midwest and the hills are mainly pretty gradual.  With shrouds on 
(spring - fall), the temps run about 25 higher.  If I see the gauge on its 
way toward 450, I'll back out of the throttle for a while - till it settles 
in at a lower number.  With headers, you likely have no or minimal lower 
shrouds.  My guess would be that you would be in that 375 - 400 range as 
well.

I also have a Rampside with head temp gauge (Spyder dash).  When on the 
highway with that one (shrouds are on and it is a 110 car engine), I 
typically see just a shade under 400 (a needle width or two).  But, I don't 
drive it as fast (around 65 - 70).  It is (of course) much more sensitive to 
head wind than the car and I stay around 60 mph in that situation.

So, for me - I don't want to see the gauge go over 450 and then not for long 
distances.  Keep in mind that these gauges are now 40 - 45 years old and I 
don't know if they are any more accurate than the original clocks.

Later, JR

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----- Original Message ----- 
From: "Secular" <rusecular at yahoo.com>
To: <virtualvairs at corvair.org>
Sent: Tuesday, September 05, 2006 12:05 PM
Subject: <VV> Cylinder Head Temperature...



  Hi:

  What would be  "normal" for a cylinder head temperature (CHT)?

  I realize many factors play in the response, nonetheless, I'm curious to 
know that for example, in hot summer days (90 Degrees outside) - city 
traffic - what should the gauge show?

  The car is a 1960 Monza with a transplanted 140HP (4 Carb) engine + 
headers (the lower shrouds are cut perfectly to fit these headers). I also 
know that many Corvair owners remove the shrouds in summer for added 
cooling.

  Regards,


  Tony
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