<VV> Head Temp

[Norman C. Witte]

One thing to add on this topic is that my 140 runs with the lower shrouds
on.  Generally I understand that removing the shrouds should be good for
about 25 deg, so that would make my results and JR's pretty consistent.

Norm 

> -----Original Message-----
> From: J R Read_HML [mailto:hmlinc at sbcglobal.net]
> Sent: Tuesday, September 05, 2006 2:54 PM
> To: VirtualVairs AA; Secular
> Subject: <VV> Head Temp
> 
> 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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