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LPG injection into diesel engine

LPG injection into diesel engine

LPG injection into diesel engine

(OP)
I shall be thankful if I could be given the list of manufacturers of diesel engines used in commercial vehicles and buses having LPG injection too along with diesel.

RE: LPG injection into diesel engine

arunmrao - do you mean complete replacement of the diesel fuel by LPG, or the addition of LPG to the intake air?

Bill

RE: LPG injection into diesel engine

(OP)
No I meant addition of LPG and not complete replacement of diesel fuel. We have now buses running on CNG in Delhi.
This question incidentally came to me from  a Pakistani friend ??

RE: LPG injection into diesel engine

To the best of my knowledge, there are no OEM producers of diesel engines who approve of the use of LPG AND diesel together.

There are a great number of aftermarket suppliers of dual-fuel devices, some work fairly well, but a great number of them do not.  I have seen the remenants of more than one engine that suffered from overfueling with lpg and diesel.  One of them is a paperweight in my office, at least, what used to be a piston.

Franz

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RE: LPG injection into diesel engine

(OP)
Thanks all for the guidance.

RE: LPG injection into diesel engine

See if this image imbed works for me this time:

[IMG]http://i9.tinypic.com/47j3x52.jpg[/IMG]

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RE: LPG injection into diesel engine

Try again:

[IMG:http://i9.tinypic.com/47j3x52.jpg]

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RE: LPG injection into diesel engine

Ok, just click on the image.

Franz

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RE: LPG injection into diesel engine

Based on a cursory scan of the web, it looks like IDI engines are prone to die prematurely, possibly owing to detonation, and DI engines fare much better, although franzh's piston looks like it came from a DI !

Bill

RE: LPG injection into diesel engine

The Cummins piston is from a 2001 5.9B 235 bhp in a 1 ton Dodge truck, with about 5,000 miles since new!  The owner was convinced to install a propane "injection" system which lasted less than one month.  The installer stated that the system was "user tunable for either economy or power", guess which one the driver selected, all the time!

This was a DI diesel engine with a home-brewed propane fumigation system.

A lawsuit ensued over who was responsible for the damage.  The court found in favor of the vehicle owner (who was just looking to get his engine replaced, about $15,000 USD) but the court took exception to the installers attitude and sales process and added on additional punitive awards of close to $50,000.  The settlement was for close to $80,000 which included the cost of a rental truck while this process was underway, about 6 months, attorneys fees, and a severe slap on the wrist.

I was called in as expert witness but never had to testify.

Franz

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RE: LPG injection into diesel engine

The only one I know of from a manufacturer is the Cummins Westport system.  I have been running one of my own design on my Duramax for 2 1/2 years now with great success.  I use it mainly as an alternative fuel.  Most of the time I burn around 3 gal of lp to 1 gal of #2.  I can't run that high of ratio when towing, it's more like 2:1 or so.  My setup starts lightly pinging as the load increases if you have it set too high, so there is no sudden detonation that can take place.

Marc

RE: LPG injection into diesel engine

Cummins Westport does not make a dual fuel diesel/LPG engine.  They do make a dedicated, spark-ignited LPG B5.9 engine.  It is mainly sold into street sweeper and phoney cable car bus applications.

Regarding fuel substitution, I figure you start saving money when the cost of LPG per gallon is less than 70% of the cost of diesel, assuming thermal efficiency stays the same.

RE: LPG injection into diesel engine

Hemi,
You are exactly right.  LP has to be 2/3 the price of #2 to break even.  The savings begins when it is less than that.  I get lp for $1.45, so it usually saves me around 3ยข/mi or so.  What is really cool is how much it increases the torque.  You have to be careful when towing because the engine doesn't act like it is working hard, but it will cause 5th gear to slip if you aren't careful. (Allison)

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