Exhaust Gas Temperature ?

[John M.]

Hi Everyone, I'm at the starting end of a Fuso camper build. My truck is a 2003 FG 5 spd.

The previous owner installed an aftermarket boost gauge and EGT / pyrometer which seems like a good idea. The thermocouple is located in the exhaust manifold between the first and second cylinders. So far I have been careful to avoid exceeding 1200F, but brief spikes a little hotter have happened.

My question is about the safe upper limit temperature.

I have googled around without finding any clear answer and am hoping the group can help guide me. I previously owned a Cummins 5.9l and the stories about melted pistons left an impression on me......

Thanks

John

 

[kerry]

I’d start worrying around 1250. Curious as to the conditions in which you saw the spikes. I’m flying blind.

 

[John M.]

The EGT rises with boost and load. Long hills at highway speeds see the temps climb from cruising at around 900 F. If I keep my foot down the gasses keep increasing. I have been watching for it and basically just surrender the speed to cool down. I guess this is why Fusos only do 35 mph up hill.... lol