exaust question

dyoung14 · #1 (**permalink**) 05-16-2008, 10:32 PM

the other day me and my dad pulled his race car to the track and when we left my truck running and we was fueling his race car up and i walked beside my truck and noticed the exaust blowing on my leg and so i felt with my had and it was pretty hot so i think i might need new exaust or some thing do yall have any ideas on how big i need to go?

fellro86 · #2 (**permalink**) 05-16-2008, 10:34 PM

Are you saying you need new exhaust because it was leaking, or because it was hot? Without a turbo, 3" to 3 1/2" is adequate.

dyoung14 · #3 (**permalink**) 05-16-2008, 10:43 PM

it has a lot of back pressure and it pretty hot at the tip and i have no turbo

fellro86 · #4 (**permalink**) 05-16-2008, 10:55 PM

I got mine so hot once that the plastic mudflap got a curve formed into it... The tmep isn't as indicative as how the engine behaves. At idle, it shouldn't be overly hot, but there will be heat all the same.

dyoung14 · #5 (**permalink**) 05-16-2008, 11:15 PM

it hot enough that you dont want to hold your hand in front of it very long, i guess i need to get a pyrometer that will probly tell me more about it

fellro86 · #6 (**permalink**) 05-17-2008, 06:37 AM

That will tell the whole story. Typically, the exhaust will be hot enough to be uncomfortable for sure.

Dave Sponaugle · #7 (**permalink**) 05-17-2008, 09:08 PM

If you were just working the engine, exhaust temps close to 1000 degrees are not out of line.

After working the engine hard, you should always let it idle a couple minutes to cool off.

I don't shut mine off till the EGT is under 300 degrees, sometimes that takes two or three minutes at idle.

dyoung14 · #8 (**permalink**) 05-17-2008, 10:19 PM

could any one tell me were i could get an egt guage and how much one cost

Dave Sponaugle · #9 (**permalink**) 05-17-2008, 10:24 PM

There are a couple sponsors that sell pyrometers.

About 150 is the going rate for both the gauge and thermocouple.