 Non contact inferred, thermometer gun |
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| shane |
 Oct 13 2019, 08:43 PM
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#1
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Member  Group: Members Posts: 355 Joined: 12-February 13 Member No.: 15,518 Region Association: None  |
Has anyone with a CHT gauge used a thermometer gun to check the accuracy of it? I was just pointing mine at the base of the spark plug on #3 and was only getting upper 200°. But it may have not been totally warmed up yet and it was just idling.
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| VaccaRabite |
Oct 15 2019, 08:30 AM
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#2
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En Garde! Group: Admin Posts: 13,423 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
I would trust the CHT (if its a good one) before I trusted the IR gun.
There is not any good way to get the IR gun to measure the head where the ring terminal sits. Under #3 is the hottest part of the non-exhaust tract for the motor (in theory). So any other place you take a head temp reading (including on the top of the #3 plug) will be cooler - probably significantly cooler. Zach |
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| Mikey914 |
Oct 15 2019, 10:52 AM
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#3
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The rubber man Group: Members Posts: 12,638 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None 
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Try to remove it from the car and check by applying some heat carefully with a small torch or lighter.
Just make sure there are no gas fumes. |
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| IronHillRestorations |
Oct 15 2019, 02:34 PM
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#4
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I. I. R. C. Group: Members Posts: 6,714 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None
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A non-contact thermometer is a useful tool. Great for checking tires and bearings when towing a load
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| shane |
Oct 16 2019, 02:14 PM
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#5
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Member Group: Members Posts: 355 Joined: 12-February 13 Member No.: 15,518 Region Association: None |
QUOTE(IronHillRestorations @ Oct 15 2019, 01:34 PM)  A non-contact thermometer is a useful tool. Great for checking tires and bearings when towing a load Great idea, also when you’ve put beers in the fridge recently and checking if there cold enough (IMG:style_emoticons/default/beer3.gif) |
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| jd74914 |
Oct 16 2019, 04:24 PM
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#6
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Its alive Group: Members Posts: 4,776 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
Cheap IR thermometers make some assumptions when calculating temperature that you can't change (emissivity and a few other things). It'd be interesting to see what you read if you painted the end or your spark plug vs. shiney metal since that would bring its optical charactertics closer to most of the assumptions.
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