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Old 02-03-2010, 08:01 AM   #1
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Default Temp Gun Accuracy

I did a little test yesterday to see if my temp gun was way off, or reasonably close. Was wondering if anyone else has done this and the results seen?

Mine is a Duratrax Flashpoint and here's what I did to test it. I preheated my oven to 200 F and I put in a Pyrex dish and a Vspec engine w/o carb. Once my oven was up to temp I pulled the dish and measured its temp, 189 F. Then I pulled the Vspec and measured like I would if it were installed, pointing at the glow plug and it came in at between 191 F and 194F.

I was quite surprised and pleased with the results. My gun was accurate within 10 F with my oven. I always thought my gun was like 30 F off.

Anyone care to try it and post results including brand of gun and reading vs. oven setting?
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Old 02-03-2010, 08:07 AM   #2
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Besy way to test your temp gun.... Next time you are at the track temp your motor with your gun, then ask someone with an exergen to IMMEDIATELY check it again with their gun, do the math and there you have it! The difference between the two guns will probably increase as the temperatures increase.
Good luck!
Not sure how accurate oven thermostats are, I know before we got the new oven our old one needed to be set at 400 instead of 350 in order to get the food cooked in the time the recipe called for.
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Old 02-03-2010, 08:19 AM   #3
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a few locals have exergen guns and neighter of them read the same temp..all had clean lense and everything temping a engine is over rated and worthless IMO...u will know if your engine is to lean by the sound/sight of it.
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Old 02-03-2010, 08:28 AM   #4
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Default Temps

I was playing around with some temp guns awhile back and had a thermal camera and did some comparisons, and here's a pic. All I can say is don't rely on the temp gun for tuning
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Old 02-03-2010, 08:32 AM   #5
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take a pot of bolling water and check it
water bolles at for the life of me I cant think right now
but it;s like 210/212 some thing like that
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Old 02-03-2010, 08:41 AM   #6
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Quote:
Originally Posted by blktransam View Post
a few locals have exergen guns and neighter of them read the same temp..all had clean lense and everything temping a engine is over rated and worthless IMO...u will know if your engine is to lean by the sound/sight of it.
I was told/heard that the best way to use a temp gun is to get your engine running correctly first. Nearly perfect with no adverse effects or as close as you can. Once you've done that run it and temp it. Use that temp as a basis and slightly richen or lean to achieve more performance.

I see people turning needles all day at the track trying to get some magical number. those engine usually run bad all day.

After break in I hardly use my temp gun again. Once i'm within range my hsn will never move more than an hour.

I have the flashpoint also.
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Old 02-03-2010, 08:45 AM   #7
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Water and ice cubes works also. But I agree start with the motor rich lean a little at a time till its just a tad lean then fatten it up 1/8th turn and let it rip. Then check it with the spit test
You should definately be able to tell if its rich or lean by the way she drives.
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Old 02-03-2010, 09:09 AM   #8
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Quote:
Originally Posted by cary View Post
take a pot of bolling water and check it
water bolles at for the life of me I cant think right now
but it;s like 210/212 some thing like that
212 F for water, even better than the oven. Will give that a try.

BTW I am by no means a temp gun fanatic, smoke and response will tell the story of an engine. Temp is a little insurance policy and maybe a little more run time.

Let's say you're running w/ good smoke, but maybe you could have a little less smoke evenly throughout the rpm range and so you go 3 hrs leaner. Your still seeing smoke and you check temps and they've spiked by 30 F. Probably OK for a 5 minute qualifier, but are you confident the temps won't rise over a 20 min main? I wouldn't be so maybe I'd richen back up 1 hour and see what that did to the temp. If I dropped back to my original temp level then I'm probably very close to an optimal tune and run time and feel confident that my temps aren't going to rise over the course of the main.

Tune for performance, then check temp as a reference.
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Old 02-03-2010, 09:17 AM   #9
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Quote:
Originally Posted by marshon50 View Post
Tune for performance, then check temp as a reference.
That's my thinking exactly.
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Old 02-03-2010, 09:28 AM   #10
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Quote:
Originally Posted by cary View Post
take a pot of bolling water and check it
water bolles at for the life of me I cant think right now
but it;s like 210/212 some thing like that
212 @ sea level.
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Old 02-03-2010, 09:39 AM   #11
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New ABC type motors need tu run at a minimum of 200f, so that all metals have expanded to there operating tolerances, as long as you are above 200f tune for performance, and remenber that a smoking exhaust is your motor best fried. I had motors coming out of the track at 260f plus and they still run great, motor temps go up and down acording to a lot of factores not just fuel tuning.
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Old 02-03-2010, 09:42 AM   #12
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Yeah because there is alot of reason besides the tune that can make an engine run hot. Leaks, bad clutch shoes, ect
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Old 02-03-2010, 09:47 AM   #13
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Quote:
Originally Posted by cary View Post
take a pot of bolling water and check it
water bolles at for the life of me I cant think right now
but it;s like 210/212 some thing like that
212 at sea level (at standard pressure) but decreases with altitude.
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Old 02-03-2010, 10:52 AM   #14
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For water tests, you would need to use distilled water. Impurities in tap water will alter the boiling point.
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Old 02-03-2010, 10:59 AM   #15
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exergen is the most consistantly accurate temp gun. other guns wil vary from 10 or 20 and even 30 above or below depending on everything from weather to ambiant temp
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