Originally Posted by duxthe1

Has anyone bothered to point out that the EGR on diesels actually helps lower the combustion temperature and the exhaust gas temperature.
As for the gunking of the intake manifold, EGR isn't the culprit there either. The gunk deposited in the intake manifold is from the crankcase vent. Volatile hydrocarbons from the crankcase are vented before the turbo. They get very hot after the turbo and the lighter components evaporate leaving the heavier components behind to form the gunk. Since the EGR valve is even hotter than the turbo a lot of gunk gets deposited there as the more volatile stuff evaporates. Think about it, what does the inside of the diesels exhaust pipe look like or for that matter the hot side of the egr valve. It's only a thin dry film of carbon. IF the EGR was the cause of deposits those would also be a thin dry film, and not the thick gooey gunk that clogs diesel intakes.

Sorry for the rant but as a responsible hot rodder I get miffed at people who automatically assume that disabling emissions equipment is the only way to make power. Don't even get me started about all of the wanna be racers removing the catalyst from their 16 second car to make it a 15 and 3/4 second car. I've built several fast street cars and make it a point to keep emissions related equip. in tact. That way when hot rodding is regulated out of existence I'm gonna be the one pointing at you.