What I have found is that there is no magic happening. My truck will get 18 mpg at 70 mph on straight #2. #2 has around 140,000 btu/gal, which comes to 7777 btu/mi. If I get 50 mpg on #2 using gas injection, that would be 2800 btu/mi. 7777 - 2800 is 4977 btu coming from the gas. LP is...
I have run propane injection on my Duramax for over three years now with great success. The key is to not use so much that you get detonation. At light load, I can burn 3 gal of lp to 1 gal of #2 and not get pinging. When towing, I have to cut it back. My setup is self modulating and has a...
You can occasionally find Fuelmakers on ebay for $3K - $4K used. They run about $8K new. I don't recommend the Phill, it only does .5 GGE/hr. The FMQ 2-36 does 1 gal/hr and is much more prevalent.
water LHV is 970 btu/lb, propane is 184 btu/lb. about 5.25:1. I know that port injected liquid propane injection is available for gasoline engines, but the only one I have heard of for diesels is the Cummins Westport. It is direct cylinder injection, and probably really expensive. Mine is...
rdd48856,
Do you mean inject liquid propane into the intake or into the cylinder? If you mean the cylinder, how would I go about doing that? I currently use a vaporizer/regulator to let the engine suck the fuel in between the air cleaner and the turbo.
I have not checked the HC on the truck, we don't have emission testing where I live. It is my understanding that when a diesel engine inhales a homogeneous mixture of a vapor fuel, it enables much more of the oxygen to be burned that is far from the injector. The diesel fuel only has time to...
I don't think they are high unless it is running at high load and getting overfueled, which I don't let it do. The lp should be cleaning up the emissions. The oil sure does stay cleaner.
Aside from the safety issues, how would you make it work? The propane would stay liquified because of the pressure from the nitrous, so you would have to take the lp off the bottom. Wouldn't you also have nitrous liquid come off the bottom? How would you separate the two so that you could...
Propane has only 1/5 the latent heat of vaporization of water, so you won't get as much out of it as you think. I have considered doing this on my diesels that have propane injection. I think I may try wrapping the intercooler pipe between the cooler and the intake with copper tubing and...
Valve seat wear is about the only thing you will probably find. The cylinders, rings, and bottom end should look great. It will probably be clean enough to eat off of inside, they are usually totally sludge free.
Years ago I believed in the 200 mpg carburetor. Then I got into propane. I realized that burning propane was accomplishing the same goal; to burn fully vaporized gas. Propane has 30% less btus than gasoline. But I found that I didn't get any outstanding mileage with lp, in fact it was worse...
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 3¢/mi or so. What is really cool is how much it increases the torque. You have to be careful when towing because the...
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...
I would like to mention an observation, then explain my theory. I have a Duramax diesel with propane injection. This truck runs 4 lbs of boost going 70 mph when running just #2. If I turn on the propane, boost drops to around 1.5 psi. When running lp, apparently it is pumping less air...
