Turtle n Peeps wrote:
Gasoline engines can tap 1,800 on sustained hard pulls, and just for kicks, nat-gas motors are nearly knocking on 1,900 on the exhaust side during a hard pull. Metallurgy becomes far more critical at those temps. So really the head, exhaust manifolds and turbine are subjected to harsher conditions in a gasoline/CNG motor than a diesel.
I don't know where these figures are coming from but I have a few real expensive ashtrays because of EGT's above 1,600 in some of my gasoline turbo engines. I know without piston squirters; gas, diesel or any other fuel you had better not go above 1,600 degrees for very long or you too can have real expensive ashtrays.
I've seen data sheets for some engines also seen plenty of articles on the SAE site over the years in regards to EGT challenges for engineers. I'm just a total gear head who loves anything and everything cars, but also shifting my hobbies towards out-doorsy stuff. Currently a tent camper but trying to align my stuff so I can get a 5'er in about a year or two. But it's those high EGT's that spawned the development of integrated exhaust manifolds (cast into the head) with coolant passages built into them and sodium filled valves. Seen my share of paperweights (cylinder heads/exhaust manifolds) as well due to really high EGT's.
