[DMCForum] Martin's class on basic diesel theory

["cruznmd" <racuti1@xxxxxxxxxxxx>]

Martin,

Thanks for explaining all of that. I definitely did not know that the 
amount of air metered into the engine was constant at all throttle 
positions.

--- In DMCForum@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@xxxx> wrote:
> 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
<snip>

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