DIY propane injection?

[the4ork]

any one got a parts list for everything?

any idea on what to run for a tank besides a regular grille tank?

how do you controll how much is being injected? i'd assume same as nitrous, a solenoid, and different nozzle sizes.

any info would be great, thinking hard about doing this to my 1.6td

[gigaz2]

so far I also only heard success stories from DI applications, and even then its dangerous and only necessary when the fuel system can't inject more fuel in the given time. and its very difficult to use your existing pump to its full potential as is.

[saurkraut]

I think Jake Russel actually broke some swirl chambers testing propane under very controlled conditions.  Best I can recall detonation = busted swirl chambers, and detonation is real easy to get.

[the4ork]

guess our engines are pretty efficient then eh

[gigaz2]

guess our engines are pretty efficient then eh

for 1970's technology, yes, for modern standards.. not really

[Darth Garry]

guess our engines are pretty efficient then eh

for 1970's technology, yes, for modern standards.. not really

I don't know, even with 2008 technology not many cars on the road getting 45+MPG.

Garry

[gigaz2]

because of emissions standards, dead easy to develop an engine to be efficient, not so easy to make it pass the ever tighter emissions standards AND still make some power.

[RabbitJockey]

also the safety standards. the cars are damn near 1000 pounds heavier... obviously some of that is how people expect more of their cars now a days so there are more commodities, but u know.  i agree tho engines in general haven't really come that far in the last 20 years.  i think the computer controlled injection has been one of the best things to happen to diesels in years, and continues to make leaps.

[zozep]

http://www.dieselperformanceproducts.com/index.html

"Fits All Turbo Diesel Engines"

[jtanguay]

for a good propane system you would need to have the injector right at the intake port of each cyl, and inject a steady amount to each... that way it is evenly distributed, because as we all know our intakes are biased to the inside cylinders.  thats just one of the issues.

the other issue is as stated above is the high compression ratio.  you can only inject a very small amount of propane before detonation occurs.  i would say that it could be due to the timing advance mechanism.  as the rpm's increase the timing increases to give the diesel more time to burn, but the propane does not really need more time... its pretty damn fast compared to diesel.  so that is most likely where the problem lies.

the big trucks see quite a bit of gains from propane injection, but that might be from the size of the engine or even the amount of fuel being injected...

[gigaz2]

I guess its because almost all of the big trucks are DI, propane with DI is ok, but only really needed in certain cases.

I believe one can tune a DI engine to run just as well without propane, but some people want to believe in miracles instead of studying

IDI and propane=detonation, as said before

[Smokey Eddy]

i am too
I was going to use a set of valves and gauges from an acetylene torch and just regulate the psi and use the size of the nozzle as a gauge with psi as to how much is going. how much your idle changes would be a good indication too

[jtanguay]

my cars idle speed goes up about 200-400 rpm when i inject the windshield washer fluid...  :lol:

[Caddyman]

here is a good link;

http://www.mrsharkey.com/lpg.htm