GM Diesel V6 for Commodore

[Armunn]

Originally Posted by thedguy

They have a very special blend of extremely low sulfur diesel made for their racing (might even be bio-diesel). Based on what Audi has told me through various press releases on how awesome their diesel engines are, the sulfur content in diesel fuel is what causes the black smoke. Bio-diesel has no sulfur, which is why it tends not to smoke.

It's not Bio-diesel they use in their race cars but synthetic diesel. It's made by turning natural gas or coal into a liquid using the Fischer-Tropsch process. This process can also turn bio-mass into diesel and has lower particulates and reduced sulphur content.

[Hidden_Hunter]

Originally Posted by Cobol74

These two diesels 3.0l and 4.5l respectively are too big for a normal car - would only suit 4x4s and light trucks here. The 3.0l may just fit something very big and heavy perhaps - Commodore like that?

Commodore is 5 series size (if not slightly larger) and the LWD statesman is 7 series size

[D-Fence]

Originally Posted by Hidden_Hunter

No-one seems to care too much about LPG so diesel can't be too negative.

I do!

[Hidden_Hunter]

Originally Posted by D-Fence

I do!

LPG version already exists

[otispunkmeyer]

looks like a nice engine..... hopefully it has the refinement and MPG in it to match or beat the germans/french V6 diesels.

[otispunkmeyer]

Originally Posted by thedguy

The US they are required to meet stricter emissions and they still do better. But they more they try and clean up diesels the more fuel efficiency goes down. BTW, aren't modern cats these days EXTREMELY high flow that to claim they are some kind of a problem is BS? I know a magazine took a SVT focus and stuck a turbo on it, put the stock cat back on it and still didn't see a rise in back pressure behind the cat.



Lean combustion is the cause of NOx. Excessive oxygen, combined with excess heat (caused by the lean burn) creates NOx. Keep the combustion temps down and NOx goes down.

is that why some are going the EGR (exhaust gas recirculation) route?

recirculate the gases to burn any unburnt hydrocarbons and reduce flame temperatures?

[thedguy]

Originally Posted by otispunkmeyer

is that why some are going the EGR (exhaust gas recirculation) route?

recirculate the gases to burn any unburnt hydrocarbons and reduce flame temperatures?

I'm far from qualified from answering that question, but from what I have read, on petrol/gas engines, EGR does reduce combustion temps as well as creating for higher compression at light loads with improved fuel economy.