Exaust Smell?

[88Racing]

Originally Posted by dplummer87

Yeah the diesel pumps around here all say...(This diesel fuel is "ultra low sulfer highway diesel" or something like that...Our 07 likes it, but our 99 seemed to run better on the "dirty" stuff...Whats up with that lol?

DJ Soutthpaw may have a better grasp on this. But if you would like to compare it to leaded and unleaded gas. Here it goes: when unleaded hit the market in the 70's a lot of cars from then and on back started to experience head problems(valve seats and valves) due to overheating. Well they took away the lead that acted as a lubricant for those parts. So maybe sulfur and some of the other chemicals due to the reduction of them the same thing is happening in diesels. Have you noticed in the last 3 years they want diesels to burn hotter to get rid of more of the byproduct junk. That's on the exhaust end.

[Jackpine]

Originally Posted by 88Racing

DJ Soutthpaw may have a better grasp on this. But if you would like to compare it to leaded and unleaded gas. Here it goes: when unleaded hit the market in the 70's a lot of cars from then and on back started to experience head problems(valve seats and valves) due to overheating. Well they took away the lead that acted as a lubricant for those parts. So maybe sulfur and some of the other chemicals due to the reduction of them the same thing is happening in diesels. Have you noticed in the last 3 years they want diesels to burn hotter to get rid of more of the byproduct junk. That's on the exhaust end.

This "burning hotter" is kind of a "damned if you do, damned if you don't" thing. At least in gassers, hotter burning causes nitrogen, which is normally pretty inert, to combine with oxygen to form nitrogen dioxide, a toxic pollutant. I wonder if it does the same in diesels.

The EGR system in gassers was developed to cool the combustion process slightly to reduce formation of this gas. (Of course it also cuts power).

Oh, your earlier question Lars - I can't imagine why a diesel would not produce some sulfur dioxide if sulfur was present in the fuel.

- Jack

[dplummer87]

Originally Posted by JackandJanet

This "burning hotter" is kind of a "damned if you do, damned if you don't" thing. At least in gassers, hotter burning causes nitrogen, which is normally pretty inert, to combine with oxygen to form nitrogen dioxide, a toxic pollutant. I wonder if it does the same in diesels.

The EGR system in gassers was developed to cool the combustion process slightly to reduce formation of this gas. (Of course it also cuts power).

Oh, your earlier question Lars - I can't imagine why a diesel would not produce some sulfur dioxide if sulfur was present in the fuel.

- Jack

But why are the new diesels not able to run (at least not supposed to) run on the older style diesel? I ask because I live in El Paso TX which is a bridge away from juarez mexico. Anyway, last summer when diesel was like 4 bucks, many people were going to Juarez to fill up their trucks because diesel was only 2.19, and when you are filling a 100 gallons (nearly %50 cheaper) thats a lot of money. However, only guys with older trucks were doing this...we couldnt do this in our 06/07 whatever it is cummings...it really screwed up the newer trucks...whats up with that? What was so different.

[Jackpine]

Good question! Maybe cleatus12r or southpaw could jump in here. I know next to nothing about diesels (except that they use glow plugs for starting).

When I was a kid, I had a model airplane engine that was a "true" diesel - no glow plug! That thing was super hard to start. I seem to remember that it would also run backwards at times.

- Jack