Hey guys,

Have a question about exhaust temp.

I was going over a somewhat steep pass nearby in my 87 6.9 turbo and the exhaust temp gauge shot to 6.5 to 700 degrees. Is this normal. It typically is betweens 3-400 around town. I wasn't pulling anything.

What u think?

 

Totally normal depending on how hard you were going on the fuel, and actually a little low if you were really on it. Easy to hit 1K+ with the pump turned up a bit.

 

You've definitely got alot of head room if your egts max around 700

I'll easily see 850+- on a grade, but my pump is maxed and my custom hotside pipes aren't the most flow efficient.

If you wanted you could take it up a flat or two if you wanted a little extra power. If you're okay with the way it is now I'd leave it alone, it'll last alot longer like that..

 

Copy that. A little more power huh. I might try to check that out. I got other items I have to tackle first though. Thanks for the input, just wasn't sure at what temp is dangerous.

 

700 degrees is just getting warmed up!!
don't worry until you start seeing 1100 degrees or so.
i keep my EGT's under 1100. if i really push it i can easily hit 1400, but you start doing damage at those temps.

 

1200° has always been the max EGT for everything from Cummins Big Cam 400's to 12 cylinder Detroit Diesels. No reason it should be different for little IDI diesels. As factory reps say, if a 1200° is constant, combustion chamber temp is so hot that the aluminum alloy from piston skirts slough off and is "welded" or deposited on the cylinder walls. Then high EGT or not, the two rough surfaces contacting each other don't last. Myself and guys I've worked with have replaced enough scored cylinder liners and pistons over the years that we can verify that is exactly what happens.

 

Sounds normal.

 

Mine usually goes to 700-800 for big hills, cruise hwy speeds 500-600, 300-400 around town