[DMCForum] Re: Martin's class on basic diesel theory

["cruznmd" <racuti1@xxxxxxxxxxxx>]

Ok. Sorry I misunderstood. I think I get it now but I won't 
guarantee it. :)

Rich

--- In DMCForum@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@xxxx> 
wrote:
> cruznmd wrote:
> 
> > 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.
> 
> That's not what I said. Diesels have no throttles and therefore 
air flow 
> is unrestricted. The manifold air pressure is near enough constant 
at 
> one atmosphere (in an ideal world) whatever engine load/speed is. 
And 
> because air pressure is constant, so too is fuel delivery with 
respect 
> to throttle position and engine speed. Engine speed sorts itself 
out 
> because the pump is driven off the cam belt, and throttle position 
is a 
> valve on the fuel pump controlled by the throttle cable.
> 
> Simplicity itself, see?
> 
> Full pelt in a diesel is putting enough fuel in to use up all the 
> oxygen. Running part throttle basically means running very lean - 
a 
> condition in a petrol which results in preignition, 
or "dieseling". I 
> think that explains it pretty well!
> 
> Diesels suit turbocharging for the same reason, and there's a very 
> simple mechanical link from manifold air pressure to the fuel pump 
to 
> enrich under boost
> 
> http://www.johns306.com/guides/turbo_diesel_tuning.php
> 
> We all know what the warm up reg on a DeLorean does. On the XUD 
diesel 
> engine as in the above article, and in my BX, the warm up 
enrichment is 
> achieved with a piece of thermo-something wire (can't remember the 
name) 
> but it's wire that contracts when cold, pulling a little lever on 
the 
> pump. It's worth £12.
> 
> Martin

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