Normal Temperature For Header Tubes?
Le Mans Master
Joined: May 2002
Posts: 5,084
Likes: 786
From: Lebanon Township New Jersey
I don't know the answer to your question but I'm sure any exhaust location will reach its highest temperature when the engine is under load, at wide open throttle. It would be difficult to shoot it with the IR gun then, unless you're on a chassis dyno.
Melting Slicks
Joined: Oct 2013
Posts: 2,569
Likes: 126
From: San Diego California
I'm tempted to find out myself.
http://www.ebay.com/itm/Alcor-EGT-Thermocouple-Probe-P-N-86258-WORKING-7027/111225754935?_trksid=p2054897.c100204.m3164&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20140407115239%26meid%3Daaa0b425bb28419696cfada1a11ca25d%26pid%3D100204%26prg%3D20140407115239%26rk%3D7%26rkt%3D20%26sd%3D321512751241
http://www.ebay.com/itm/like/321512751241?lpid=82
Steve
http://www.ebay.com/itm/Alcor-EGT-Thermocouple-Probe-P-N-86258-WORKING-7027/111225754935?_trksid=p2054897.c100204.m3164&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20140407115239%26meid%3Daaa0b425bb28419696cfada1a11ca25d%26pid%3D100204%26prg%3D20140407115239%26rk%3D7%26rkt%3D20%26sd%3D321512751241
http://www.ebay.com/itm/like/321512751241?lpid=82
Steve
Racer
Joined: Jan 2013
Posts: 300
Likes: 10
egt probes
[QUOTE=Cavu2u;1587971033]I'm tempted to find out myself.
EGT probes require you to drill holes in your header tubes. You can buy temp. strips that just stick on your tubes and turn black when a temp is reached. They come in all temps generally they are three dots 25 degrees apart for ex. 500, 525,550 if you reach 525 the first 2 dots are black.
EGT probes require you to drill holes in your header tubes. You can buy temp. strips that just stick on your tubes and turn black when a temp is reached. They come in all temps generally they are three dots 25 degrees apart for ex. 500, 525,550 if you reach 525 the first 2 dots are black.
Melting Slicks
Joined: Oct 2013
Posts: 2,569
Likes: 126
From: San Diego California
[QUOTE=caryb78;1587972583]
Much better to answer his question. 
I'm tempted to find out myself.
EGT probes require you to drill holes in your header tubes. You can buy temp. strips that just stick on your tubes and turn black when a temp is reached. They come in all temps generally they are three dots 25 degrees apart for ex. 500, 525,550 if you reach 525 the first 2 dots are black.
EGT probes require you to drill holes in your header tubes. You can buy temp. strips that just stick on your tubes and turn black when a temp is reached. They come in all temps generally they are three dots 25 degrees apart for ex. 500, 525,550 if you reach 525 the first 2 dots are black.
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Thread Starter
Racer
Joined: Jun 2009
Posts: 409
Likes: 3
From: St. James, NC
I switched to a NGK Iridium Spark Plug #7177 from AC Delco R43TS plugs. The AC Delco suggested the engine was rich (clean electrode strap but really sooty at the base). Not so with the HGK Iridium plug, clean electrode strap and a lot cleaner at the base. The engine loves the NGK plugs but I'm worried about the exhaust temps.
Last edited by wheatpj; Oct 4, 2014 at 11:32 PM. Reason: More Info
Melting Slicks
Joined: Jun 2011
Posts: 3,114
Likes: 592
I have a couple of tubes with temps around 650+. I took the temps with an IR gun. I don't know if I have a problem with the engine. The header are ceramic coated. The coating looks like it's going bad on the tubes that are the hottest.
I switched to a NGK Iridium Spark Plug #7177 from AC Delco R43TS plugs. The AC Delco suggested the engine was rich (clean electrode strap but really sooty at the base). Not so with the HGK Iridium plug, clean electrode strap and a lot cleaner at the base. The engine loves the NGK plugs but I'm worried about the exhaust temps.
I switched to a NGK Iridium Spark Plug #7177 from AC Delco R43TS plugs. The AC Delco suggested the engine was rich (clean electrode strap but really sooty at the base). Not so with the HGK Iridium plug, clean electrode strap and a lot cleaner at the base. The engine loves the NGK plugs but I'm worried about the exhaust temps.
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
I can't answer how hot my Corvette headers get, but I can say that if you have a powerful motorcycle with single tube headers and do an extended burnout at night the headers will glow bright orange.
It's easy with a bike, front brake fully on, get the rear tire spinning in first, and up shift a gear or two. Keep going until the tire gives up.
My point, is as stated in post #2, under load, the engine will generate mucho heat and the headers will prove it.
Pete
It's easy with a bike, front brake fully on, get the rear tire spinning in first, and up shift a gear or two. Keep going until the tire gives up.
My point, is as stated in post #2, under load, the engine will generate mucho heat and the headers will prove it.
Pete
Thread Starter
Racer
Joined: Jun 2009
Posts: 409
Likes: 3
From: St. James, NC
GM ZZ383 I am using r42lts, my plugs started at black sooty. Install a zeitronix wide band O2 data logging system. Change the holley carb jets from 70 primary 75 secondary to 65-70, Now runs 12.5-13.2 at WOT. Timing 32 max at 3500. Plugs are now running light grey / brown. Also gained 0.56 at the 1/4 and added 3 MPH. I am running at 2200 ft elevation. Temps at idle are 555+ and after 1/4 mile runs 650-700 range. Before tunning temps were similar or near impossible to notice a difference.
Melting Slicks
Joined: Jun 2011
Posts: 3,114
Likes: 592
If you plan on keeping a carb in tune you cannot go wrong with O2 data loggers to determine AFR under different driving conditions. I also have a 6530 MSD Programable ignition to program a timing curve to match the AFR readings. Proper AFR allows less timing advance and cooler running temps without giving up performance. EFI is still the best way to go.
Racer
Joined: Jan 2014
Posts: 334
Likes: 6
Last time I zapped the header tubes with an IR gun (about one inch from the heads) the temps ranged from 360 to 440 degrees at idle after a long drive. (Whether or not my engine is "properly operating" or not is another story!)