exh gas temp.

richie 2 · 09-04-2022, 10:52 AM

howdy...would header tube temp. from a heat gun tell me if im rich or lean? carb/bbc w/unleaded fuel. cant get a plug reading and unable to install a EGT meter. tks

MR DERBY CITY · 09-04-2022, 02:39 PM

Might work if your crew man is skinny enough to fit under the hood while you are making a run …..

Jim Caughlin · 09-04-2022, 05:37 PM

Quote:

Originally Posted by MR DERBY CITY

Might work if your crew man is skinny enough to fit under the hood while you are making a run …..

Not only that but EGT raises very slowly, the temp you see at the finishline is more like what the engine saw at the 1/8 mile mark. EGT is more to see that all 8 cylinders are equal, Oxygen sensor is the tuning device.

B Parker · 09-04-2022, 08:38 PM

The best way is to read your plugs. Even if you have to when you get back into your pit area. If far from the end of the track have someone pull you back with a golf cart. If you can't read your plugs after a couple of runs find someone that can. BP

Charles Stewart · 09-05-2022, 10:01 AM

Quote:

Originally Posted by B Parker

The best way is to read your plugs. Even if you have to when you get back into your pit area. If far from the end of the track have someone pull you back with a golf cart. If you can't read your plugs after a couple of runs find someone that can. BP

This link will help you...
https://www.dragstuff.com/techarticl...ark-plugs.html

Stan Weiss · 09-05-2022, 11:57 AM

Even if you ran it long enough to get a true EGT reading.

Is EGT really a good indicator of A/F ratio?

Stan

SSDiv6 · 09-04-2022, 09:21 PM

Quote:

Originally Posted by Jim Caughlin

Not only that but EGT raises very slowly, the temp you see at the finishline is more like what the engine saw at the 1/8 mile mark. EGT is more to see that all 8 cylinders are equal, Oxygen sensor is the tuning device.

Jim is correct. By the time you are in the top end and shut down the engine unless you have a data logger, the ambient air will cool down the headers. That's why I prefer an AFR with datalogging.

richie 2 · 09-04-2022, 10:16 PM

great insight derby tks.. ive read that trying to read a plug using unleaded fuel is near impossiable. they presently show pretty clean, no colour what so ever.

09-04-2022, 10:52 AM	#1
richie 2 Senior Member Join Date: Feb 2009 Posts: 971 Likes: 432 Liked 205 Times in 93 Posts	exh gas temp. howdy...would header tube temp. from a heat gun tell me if im rich or lean? carb/bbc w/unleaded fuel. cant get a plug reading and unable to install a EGT meter. tks Last edited by richie 2; 09-04-2022 at 11:00 AM.

09-04-2022, 02:39 PM	#2
MR DERBY CITY VIP Member Join Date: Feb 2014 Location: Derby City, USA Posts: 3,670 Likes: 1,095 Liked 8,260 Times in 1,543 Posts	Re: exh gas temp. Might work if your crew man is skinny enough to fit under the hood while you are making a run …..

09-04-2022, 08:38 PM	#4
B Parker Senior Member Join Date: Sep 2009 Posts: 854 Likes: 1,006 Liked 2,360 Times in 467 Posts	Re: exh gas temp. The best way is to read your plugs. Even if you have to when you get back into your pit area. If far from the end of the track have someone pull you back with a golf cart. If you can't read your plugs after a couple of runs find someone that can. BP

09-05-2022, 11:57 AM	#6
Stan Weiss Senior Member Join Date: Apr 2020 Location: Phila, PA Posts: 800 Likes: 0 Liked 735 Times in 386 Posts	Re: exh gas temp. Even if you ran it long enough to get a true EGT reading. Is EGT really a good indicator of A/F ratio? Stan

09-04-2022, 10:16 PM	#8
richie 2 Senior Member Join Date: Feb 2009 Posts: 971 Likes: 432 Liked 205 Times in 93 Posts	Re: exh gas temp. great insight derby tks.. ive read that trying to read a plug using unleaded fuel is near impossiable. they presently show pretty clean, no colour what so ever. Last edited by richie 2; 09-04-2022 at 10:33 PM.