Max allowable EGT on "600" egine while towing

[hensign]

1200 ia a nice number but I have to say that if you believe the 600 is limited to that you are wrong. I have seen 1250 unloaded without the box accelerating up an onramp and over 1300 with the trailer on pulling a grade... . These are completly stock temps measured at the manifold by cyl 5. I know it will go hotter running more pressure and have to syspect that the 1450 that has been mentioned is more realistic. To keep it at 1200 up a grade I would be in 2nd at 2800 rpm's.

 

[SKnopp]

high temps

I made a run from louisville Ky to Poseyville In. UP I was unloaded towing a 25ft goose-neck. EGT's where in the 850* to 900* range. At that time I had the BD X power and was pushing the truck hard. On the way back I was loaded with a 1066 with cab and a set of dual wheels with fluid in all four rear tires. Wieght was around 25000 counting the trailer and I ran the whole way at or above the 1250 mark. These new trucks are built to take the heat. my water temp never rose above 210 both ways. I love my new truck for all it's worth. ($45,000) :--)

 

[jcarew]

My 002 Dodge cab,chassis is a Class C motorhome its 11ft 6" tall weighs about 12k. It pushs a wall of air an used to run egt hot from new, never had water temp problems. I had a turbo from an 8. 3 cummins installed. no more heat problems. Go down the road keep up with anybody. Maybe the newer trucks are more heat resistant than my old one . But alumunum still melts about 1200%.

 

[BHolm]

Just because aluminum melts at 1200 and the egts can easily get there doesn't mean that the pistons are running as hot as the exhaust gasses. The pistons are cooled by oil jets shooting up underneath. This keeps the actual piston material temps lower. I can easily see 1050 post turbo on an empty, stock truck. That makes for 1350 or better in the combustion chamber and I haven't melted any pistons. Since these are readings from a stock truck I am sure we can deduce that the true limit leading to a failure is higher. It has been posted here before that the "600" engines can sustain 1450 for brief periods. In addition to the piston squirters the exhaust manifold is of a different material than older engines to withstand the higher temps of the new engines. I would also bet that the pistons are not just aluminum but and alloy. That blend likely raises the melting point beyond pure aluminum. Lots of factors contributing to the ability of the new engines to live under harsher conditions.