Ir readings at thermostat housing too high - Team Camaro Tech
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post #1 of 5 (permalink) Old Feb 28th, 11, 04:43 PM Thread Starter
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Join Date: Feb 2003
Posts: 335
Ir readings at thermostat housing too high

I'm working the kinks out of my 68 327/275. No gauge but I've been checking the coolant using an ir temp gun. I'm using 180 degree thermostat. When I filled with 50/50 coolant I left the cap off as it initially warmed up and noticed after idling a short time the thermostat opened and the water started flowing through the radiator. I topped off the radiator and installed a new cap (NOS) type. After a couple of normal speed drives 45 - 55 mph for say 10 miles i brought the car home opened the hood and checked the thermostat housing with my ir gun. Here are the results:
1. On top of thermostat housing 205*
2. At upper radiator hose above thermostat 178*
3. At upper radiato hose at radiator entrance 178*

I have no overheating gurgling or boil over. Do you think te 205* is too hot or is the hose a more realistic reading? Also, I have some heat sink when hot but I'm thinking that might be timing or starter. Car runs great.

What do you guys think, is it too warm.

68 convertible 327 Ralley Green, White top, Deluxe Ivory interior, powerglide with white bumblebee stripe
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post #2 of 5 (permalink) Old Feb 28th, 11, 09:06 PM
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darrell
 
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Location: texas
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Re: Ir readings at thermostat housing too high

kinda over working this one--seems right--dont forget the right fan shroud --its the key to keeping the temp down
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post #3 of 5 (permalink) Old Feb 28th, 11, 09:41 PM
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Steiner
 
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Re: Ir readings at thermostat housing too high

Gotta remember you're only reading the external temp of a piece of metal. It's both pulling heat out of the coolant and dealing with underhood radiant heat so 205 isn't bad. Best thing might be to get a cheap mechanical gauge to stick in the head. I got one for $17 not long ago just because I needed the reducing bushing out of it.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
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post #4 of 5 (permalink) Old Mar 1st, 11, 02:31 AM
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Steve
 
Join Date: Oct 2009
Location: Cincinnati
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Re: Ir readings at thermostat housing too high

Quote:
Originally Posted by Steiner View Post
Gotta remember you're only reading the external temp of a piece of metal. It's both pulling heat out of the coolant and dealing with underhood radiant heat so 205 isn't bad. Best thing might be to get a cheap mechanical gauge to stick in the head. I got one for $17 not long ago just because I needed the reducing bushing out of it.
You're also picking up the result of heat being conducted from the intake / block - not all of that heat will end up in the coolant - there has to be a temperature difference for heat to be transferred from the engine to the coolant. The radiator hose should be a pretty good indicator of the coolant temperature which is what I think you want, not the block temp. Seems like a reasonable temperature profile observed to me.

69 Pace Car and 69 Hard top
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post #5 of 5 (permalink) Old Mar 1st, 11, 03:19 AM Thread Starter
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Re: Ir readings at thermostat housing too high

Ok, thanks. So the reading at the hose is what I should be going by once the thermostat has opened and the car has warmed up. That's what I needed to know. So, if I'm showing 178* at the upper radiator hose and I have a 180* thermostat then its perfect. You know how it is with a new build, just wanted to make sure. Thanks again.

68 convertible 327 Ralley Green, White top, Deluxe Ivory interior, powerglide with white bumblebee stripe
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