[Vwdiesel] cold start lever

[Harmon Seaver]

   Right -- that's weird. It's hard to see why it wouldn't tend to kick back in
a diesel as well, but I guess not.


On Tue, Aug 27, 2002 at 12:47:41PM -0700, maded wrote:
> Of course that is the opposite of what we learned about gas engines.  My
> aircraft magnetos starting device retards the timing so that when (or IF)
> the fuel lights off the prop is already "over the top" and it will continue
> to turn the correct way.  They have been known to "kick back" when starting
> cold without the device thus causing havoc with gears or arms if "hand
> propping".
>
>
> Ed Lowe, Seattle
> 82 Westy diesel upgrading to 1.9td
> 85 Golf diesel
> 92 Cabrio
> 97 Passat Tdi
>
> >From: Nate Wall <nwall at opei.org>
> >To: Harmon Seaver <hseaver at cybershamanix.com>
> >Cc: vwdiesel at vwfans.com
> >Subject: Re: [Vwdiesel] cold start lever
> >Date: Mon, Aug 26, 2002, 12:10
> >
>
> >It DOES advance the pump timing and its either 5 or 7 (I forget) crankshaft degrees
> >AT IDLE. at increasing RPMs the advance is less and at about 2,200 RPMs, the handle
> >has no effect., . Here's the physics (thermodynamics).  At X timing, the fuel has X
> >amount of time to burn in the cylinders. When the engine is cold, and its freezing
> >outside, in order for the fuel too burn more completely (or even light off at all,
> >if its REAL COLD) it needs more time to burn in the cylinder. Advancing the
> >injection timing does just that--Injects it a little sooner, thus giving it more
> >time to burn before the power stroke begins. I'm sure someone can explain this
> >better than that.
> >
> >--Nate
> >
> >Harmon Seaver wrote:
> >
> >>    I just read somewhere that the cold start lever on the pump *advances* the
> >> pump a bit for starting. This seems strange to me, I had assumed that it
> >> *retarded* the pump a bit to make it easier to crank over. Which is it? And does
> >> anyone know how many degrees it changes it?
> >>
> >> --
> >> Harmon Seaver
> >> CyberShamanix
> >> http://www.cybershamanix.com
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> >
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--
Harmon Seaver
CyberShamanix
http://www.cybershamanix.com