[Vwdiesel] Convert 1.9TD to spark?

Harmon Seaver hseaver at cybershamanix.com
Tue Jan 22 14:27:22 EST 2002

   Well, back during WWII most of Europe ran on woodgas for tractors,
cars, and trucks. And they didn't up the compression, but to get
efficiency from woodgas, it really needs a minimum of 13.5:1 plus lots
of ignition advance. A turbo does wonders on top of this. There are a
lot of people in India running converted diesel gensets on woodgas, some
commercial manufacturers of them even.
   Taking a gasoline engine and running it on woodgas, you lose 40-50%
of the rated hp. If you use a diesel converted to spark instead,
especially a turbo diesel, it's not so bad. And because of the lower
"octane" (slow burning of the CO and H in the producer gas), you can
really use the higher compression.

LBaird119 at aol.com wrote:
> In a message dated 1/21/2002 4:09:02 PM Pacific Standard Time,
> hseaver at cybershamanix.com writes:
> >    14:1 is barely acceptable, I'd prefer 22:1 or higher. And I don't
> >  know what use the injector pockets would be.
> >
>   I find this interesting since the VW diesel is actually most efficient at
> 16:1 to 18:1 CR.  The higher ratio is for starting purposes only, really.
> They ran a lot of vehicles on woodgas during the war such as in Korea.
> If this is the type of application you're talking about.  I seriously doubt
> that they upped the CR on all those conversions.  Once you get above
> the 13:1 to 18:1 range you're fighting a lot of extra compression that robs
> you of power and efficiency.
>   Just observations and opinions formed from what little I know on that
> stuff.  I've never really seen much on those charcoal powered cars and
> trucks.

Harmon Seaver

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