temp gun accuracy
Yesterday at the track I pulled off the track and a fellow racer zapped my temp with his exergen and it came back like 220. I do next qualifier and check it with my Raytek...250. No changes in air temp, etc. I don't tune just to temp, but like to have an occasional reference point. Whats up with the variety in readings? When I used my o'donnell it was always reading lower then my raytek, but I trusted more towards the raytek...
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I've always wondered the same thing. I can tell you the losi temp and tune has been the farthest off that I've seen. I temped mine with it and it was 219f and friend of mine that was standing right there temped it with his exergen and it was actually 184f. But I guess I'd rather have it reading high then low. I have 3 temp guns the raytek,losi and duratrax and there is usually a 15-20 degree difference between the 3. And don't even try the duratrax on a new shiny cooling head! That is just a waste of time! What's the point of buying one if they are that far off?? Hell, what's to say the exergen is even right??
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Most are different, thats why when Im tuning, I use my gun only
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None of my temp guns have been all that reliable. I use them to double check what I allready know.
Nowadays, I just lick my finger and wipe some spit on the cooling head. You should be able to see the wet mark you made on the head for a second or two. If your above 280 that wet mark won't stay there at all. I tune to performance only, and watch for smoke. Temp guns are useless. |
Yep if it is over 280 Spit wont stay but Skin will :lol::lol::lol::lol::lol:.
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I dont use a temp gun anymore. The only one you can really trust is the Exergen and its just too expensive for me.
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To check your temp gun. Boil a pot of water. Right when the water starts to boil temp it with your gun. At sea level water boils at 212 degrees. That the most accurate way to check you gun hope it helps
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Originally Posted by gkn0315
(Post 6344069)
To check your temp gun. Boil a pot of water. Right when the water starts to boil temp it with your gun. At sea level water boils at 212 degrees. That the most accurate way to check you gun hope it helps
I can't think of any other naturally occuring constant temp to use unless I want to stick it in my butt. |
Originally Posted by WingWrecker
(Post 6344121)
I've thought of that (I need to find out when water boils at my elevation) but can an IR gun really read moving water?
I can't think of any other naturally occuring constant temp to use unless I want to stick it in my butt. The IR guns lens just fogs over if you temp the water in the pot. Not to mention water in a silver pot looks alot different than a cylinder head. You can measure the side of the pot. But I've still had varying degees on success with that. Then your temping the pot and not the water, they aren't going to be the same. Use a THIN aluminum pot and temp its side with the pot of boiled water off of the burner, let the pot sit a bit before you temp it, water deosn't cool that fast. Best thing about this test is you'll be alot closer to your kitchen garbage can. |
Originally Posted by Zerodefect
(Post 6344183)
Best thing about this test is you'll be alot closer to your kitchen garbage can. |
If I didn't have a temp gun I would burn up my engine for sure. Not new to nitro engines but new to nitro in a car.
On airplanes it's so much easier. Just go WOT and turn the needle to the rich side of max rpms. Not to mention that the whole time you are using it, you are flying through the cooling air. Cars are driving me nuts learning how to tune them. |
The way I found out how close or not my temp gun was, is to get a friend with a exergen and get a soldering iron. Get the soldering iron going and temp it with the exergen and your temp gun at the same time. Then just compare the difference. Thus worked out well on 2 out of the 3 temp guns I got. That damn duratrax will be within 10 degrees at one point and then 40 degrees off further up the line!
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Originally Posted by AndysD8
(Post 6342270)
I've always wondered the same thing. I can tell you the losi temp and tune has been the farthest off that I've seen. I temped mine with it and it was 219f and friend of mine that was standing right there temped it with his exergen and it was actually 184f. But I guess I'd rather have it reading high then low. I have 3 temp guns the raytek,losi and duratrax and there is usually a 15-20 degree difference between the 3. And don't even try the duratrax on a new shiny cooling head! That is just a waste of time! What's the point of buying one if they are that far off?? Hell, what's to say the exergen is even right??
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Originally Posted by shanty140
(Post 6344491)
A friend of mine had the same issue with the Losi Temp and Tune as you did. His was a good 20-30 degrees higher then it should of been. I have actually had good luck with my blue Duratrax temp gun. It is a couple degrees off the really high end temp guns but good enough to get a idea of how your motor is running.
I'm sending my Losi in for warranty replacement, but I dont think it will make a difference. |
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