header temps

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Aug 28, 2005 | 12:33 AM

gator79

Thread Starter

Safety Car

Joined: May 2005

Posts: 4,176

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From: Jennings LA

header temps

got a new IR temp gun and was checking around, there is a big difference in my header temps at each cylinder anywhere from 237 to 450 degrees. the cylinders at the rear of the engine seem to be hotter. I know all the tubes make different bends could this be why? is this normal?

Aug 28, 2005 | 12:47 AM

Retro78

Drifting

Joined: Oct 2004

Posts: 1,259

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From: Ontario

I found that the bends do make a big difference, shoot on a consitent place on each cylinder right near the flange. The rear cylinders are hotter on mine by about 30.

Aug 28, 2005 | 02:47 AM

Carl Granquist

Pro

Joined: Oct 2004

Posts: 624

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From: Shoreline WA

Hot

My headers show a range of between the high four hundreds and the low five hundreds (degrees farenheit) measured at about one inch back from the flange. That's the easiest place for me to hit with the red light spot on all eight pipes. And that's after about a half hour run at city street speeds on a sumer afternoon (seventies to eighties ambient). I know there's a huge amount of heat building in there and I'm amazed my plug wires haven't melted yet. Back home in the garage I generally lift the hood for a couple of hours to help dump the heat. I paid a lot for my new Delco ignition wiring.

Aug 28, 2005 | 03:42 AM

Patience

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Joined: Mar 2005

Posts: 80

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From: Sunnyvale California

Yup, the front two header tubes (one on each side) is about 30-70 degrees cooler than the back ones. I'm assuming airflow from the fan contributes to this phenomenon.