<VV> Cylinder heads hot

[jvhroberts at aol.com]

 Agreed, for the garden variety infrared thermometer (the laser is simply for aiming purposes, it has nothing to do with temperature measurement itself), is more than close enough for these purposes. 


 


John Roberts

 


 

-----Original Message-----
From: Ron <ronh at owt.com>
To: Frank F Parker <fparker at umich.edu>
Cc: virtualvairs at corvair.org
Sent: Tue, Aug 4, 2009 2:49 pm
Subject: Re: <VV> Cylinder heads hot










No, dead wrong as the laser thermometer is looking for total emissivity 
reading and the black paint thing only applies to spectral or solar 
emissivity.  We do not have a sun in the engine.
RonH

----- Original Message ----- 
From: "Frank F Parker" <fparker at umich.edu>
To: "Stephen Till" <still63 at att.net>
Cc: <virtualvairs at corvair.org>
Sent: Tuesday, August 04, 2009 11:23 AM
Subject: Re: <VV> Cylinder heads hot



On Tue, 4 Aug 2009, Stephen Till wrote:

> If I may suggest a laser thermometer pointed at the cylinder head. When I 
> use to overhaul aircraft engines we us to check each cylinder head to 
> watch CHT temp on engine break in. If you see a cylinder running lean you 
> will see it with a laser thermometer. My thought is to isolate your CHT 
> system from the engine. You could also point at each exhaust stack which 
> will tell you if one cylinder is running leaner than another. Gauge 
> systems will play games with your mind and are are not always correct. 
> Just a idea. Steve Till



Good idea but most laser thermometers do not have adjustable emmisitivity
and thus the item being measured needs to be dark or black for accurate
reading. Paint a THIN coat of black paint on a small spot on ea area you
wish to measure if they are reflective aluminum. Errors can be quite high.

regards,

frank



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