ct2500

hey guys iam interested how hot i can get my stock exhaust manifold I have comp and injectors on level 5 ive seen go up to 1450 degrease. my pyro probe is in my exhaust manifold.
thanks Scotty

blackdiesel

1350 for extended periods of time. 1400-1600 for very short bursts

HOHN

^^ NOt that simple. Search on my name ("find all posts by user") to see my long post on why this is true.

RowJ

For a simply safe rule of thumb.... I'm more conservative than "blackdiesel02".
Empty...long hill climb, etc. - 1200* max
Towing or hauling heavy... long hill climb - 1100* max
Short bursts, any conditions -no more than 10 sec over the above, and ok up to say 1500*!

With your power set up, these limits may be a little conservative.... but still a good safe rule to follow.
Better safe than sorry

RJ

MadDog01

I have to agree with RJ. But I'm conservative also. The truck cost too much to take a change and burn a hole in a piston. I also read a thread where they said # six cylinder is about 100 degrees hotter than the rest! So when I tow which is most of the time I don't go over 1100 up long grades!


Gary

d0dg301

I am curious as to what speed one could expect up say a three mile long fairly steep grade keeping at the 1100' temp. For myself this past weekend I kept my truck at 1200' to 1250' going 40 mph. Sure I had more power left but the temps make me a little nervous .

RowJ

When I had a big single, it was interesting. Temps were no problem at 70-75 mph. Problem was traffic would not allow that speed. Ended up having to lock out OD and stay in third at 50 mph.... and 2000 rpm to keep egt's around 1100*!

With twins, all those headaches/concrerns disappear

RJ

one54ton

Mine has got as hot as 2k (estimated) for very short bursts. It wont do it anymore but at least you know the manifold can withstand it.