[Vwdiesel] Re: [Audi-VW-Diesels] White smoke means?

[Nate Wall]

<<<Right now I'm timed near the Rabbit
setting.  IIRC, white smoke means too much advance, correct?>>>

Nope, that's an indication its retarded timing. (Also can be an indication of
other problems, such as low compression, too.) Less time for the fuel to burn
when retarded, so th white, unburned fuel (like when its cold out). So is the
"Gutless" symptom you mention. I believe timing is motor, not pump, specific.
Use a dial indicator and time to the Rabbit motor spec and see what happens.
Fuel economy should increase too. Fuel economy and power increase w/
advancing timing, up to a point, than pressures continue to increase w/ more
advance, straining the engine. I think its risky to advance timing beyond the
spec.

Wow, 1.05 to 1.15 timing spec? Maybe it is pump specific? I thought the TDs
had the most advanced spec, and thats at 1.00 MM. (Its because of the higher
break pressure injectors take longer to open, so the timing is advanced to
compensate for the slightly delayed opening on the TD).

--Nate

--Nate

Jim Arnott wrote:

> So after a month's hiatus we finally returned to the
> Stinkenklankenkampenwagen.  For those that need a refresher, the
> aforementiond SKKW is an '82 Westy with a 1.5 ltr bunny motor and
> Vanagon fuel pump.
>
> We stopped off and chatted with the kinda local Bosch injection
> specialist, Wentland Diesel Service in Milton-Freewater, OR.  Their
> opinion was that the Vanagon pump ought to be able to correctly fuel
> the smaller motor.  Their tech recommended backing off the "smoke"
> screw one full turn and taking it from there.  Doing this resulted in a
> noticably cleaner exhaust with just a puff of white smoke on free
> acceleration.  Now I suspect that the timing has become the issue.
>
> The factory setting for the Vanagon pump is .88mm.  The factory setting
> for the Rabbit pump is 1.05-1.15mm. Right now I'm timed near the Rabbit
> setting.  IIRC, white smoke means too much advance, correct?
>
> What is the effect of advance and retard on a Diesel engine?  This
> motor sounds good, but it's as gutless as gutless can be. Any chance
> that retarding the timing will yield a touch more power?  I'd like to
> get it close enough that I can drive it over the pass to the experts
> for fine tuning... As it is now, it would be an all day expedition (75
> miles, over a 5k ft pass.)
>
> As always, thanks in advance for your thoughts.
>
> Jim
>
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