Re: [DMCForum] Re: PRV Alternatives: (nevermind)

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Volvo diesels have never been known for being very good.

to say "modern" diesel is a bit different than talking about a "modern" 
petrol engine. A diesel engine is much simpler than a petrol engine. 
Apart from the obvious main engine differences, there are no spark plugs 
and no throttle(s). The engine is controlled solely by the metering of 
the fuel. You put your foot down more, it injects more fuel, the more 
power you have. The amount injected is directly proportional to the 
position of your foot and manifold air pressure is more or less constant 
given the lack of throttles! So basically if you want to drive a diesel 
economically, don't have a lead foot.

So how is it done? Well, the older, simpler diesels run a single fuel 
pump, run off the cam belt that does all the work of timing the 
injection, and the throttle cable attaches to a lever on top of the 
pump. Fuel is injecte dinto the intake tract, much the same as a petrol 
engine.

The only electrical devices on the entire engine are the glowplugs, 
which work for the first few seconds on cold startup, and the fuel 
cutoff valve - which is the only way to stop it once it starts.

"Modern" diesels are all EFI and more critically direct injection where 
the fuel is injected directly into the cylinders. The VW/Audi "TDi" 
engines, also found on Landrovers are mechanical direct injection, The 
Peugeot/Citroen and Renault engiens are all EFI. EFI does not give much 
better economy than TDi but does give cleverer control of the turbo, and 
given the nature of a diesel engine, a turbo suits it perfectly.

Martin

Marc Levy wrote:

> I'd be interested in what modern Diesel engines from
> Europe may fit the DMC transmission.
>
> If you (Rich) or anyone were to attempt this
> conversion, it would be better to use a more modern
> engine than what Volvo used 20+ years ago.  The modern
> options burn cleaner, and are more powerful.... But
> not available in the USA!  :(
>
> One of the web sites I read said that Volvo
> discontinued the Diesel due to reliability problems.

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