[Vwdiesel] propane fumigation

[dieseltdi at verizon.net]

I have used propane injection in two distinct forms.  One was a  
constant low flow system that was on all the time but at a very low  
amount.  It made a difference in power but not much.  The other  
system was a "dump" system.  It was boost activated and like a NOS  
system, simply opened a valve and let propane into the system above a  
certain boost pressure.  Three problems I had with this system: 1)  
hard to regulate the amount of propane hit, it was always way too  
hard or just barely noticable, still there but very low, 2) system  
does not adjust for higher speeds or boosts, it delivers the same  
amount all the time, and 3) I had constant problems with the valve  
freezing up, unfortunately often in the OPEN condition, scary to say  
the least since the car will run even with no diesel being given to  
the engine.  There are some systems available that are variable with  
boost level that start with a small amount on propane and then  
increase the amount as speed and boost increases.  They do add power,  
they do lower EGT but from my experience, they can be very finicky.   
Hayden

On Jul 5, 2005, at 9:32 PM, Area31 Research Facility wrote:

> I am looking to put a propane fumigation system on my 1991 Jetta  
> 1.6 TD.
> This is like nitrous to a gasoline engine.  I have observed the  
> performance
> increase benefits of stuffing a low flow propane hose into the air  
> intake of
> my 1.5NA diesel Rabbit engine on my genset.  It sure doesn't take  
> much to
> perk that baby up and you can hear it rattle if you go too far.   
> I've read
> that something like 30-40% additional horsepressure gains can be  
> had by
> doing this to a turbo engine.  I've also heard that it is easy to  
> make the
> engine go kaboom so a precise and automatic proportional metering  
> system is
> what I need to come up with.  Has anyone here had experience in such
> matters?
>
> I was thinking of a propane regulator that determined flow demand  
> based on
> the boost signal in the manifold pressure the way the FI pump  
> enrichment
> system aneroid does.  One could take a regulator and seal off the  
> atmosphere
> side of the regulator diphragm to an input tube coupling.
>
> Rob
>
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