[Vwdiesel] cold start lever

[Nate Wall]

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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