egr comments

[flyboy]

1982 300sd ,
asking for input on the pros and cons on disabling the egr valve. have had conflicting answers locally. live in calif. if that matters. any voice would be appreciated. thanks in advance,
gary

[Hit Man X]

I doubt there is emission testing for your diesel there, find out before doing anything. I have a safety only here and it's $12.50 only.

If there is no sniffer for it (which I suspect), pretty much everyone bypasses the EGR as it creates some problems. Boost leaking, lots of junk into the intake manifold as well as the backside of the valves, and poor performance.

Also, check around in the diesel section for lots more info. There is a GP about to go down on an EGR bypass kit.

[duxthe1]

Despite the hoards suggesting otherwise I'd leave the EGR in tact. It does serve a useful and beneficial purpose. Besides making the air more breatheable it lowers the EGT (ehaust gas temp) which will add years of life to the turbo. By lowering the pressure spike and slowing the flame front of combustion it allows power to be extraced over more degrees of crankshaft angle. Considering it is only active during partial load conditions, power is not signifiantly affected. The issue of gumming of the intake is wrongly blamed on the EGR. The gum is actually a buildup of less volatile crankcase vapor HC's, caused from the heat of the turbo and egr combined evaporating the more volitile components of crankcase vapor leaving the gum.

I'm sure I've got a flame war coming but until someone proves they have a diesel that can run less than 14 secs in the 1/4 mile I will maintain a position that there is no good reason to take a slow car and make it pollute more so it can be a (still) SLOW car.

It's the irresponsibe attitude that "emissions equip. is the bane of all horsepower and must be done away with " that is gonna get the sport of hot rodding legislated out of existance.