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Who else is using Propane?

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I've been looking into using propane on my dually to gain some MPG since fuel is killing everone, I've searched the forum and only found a few people that have tries these systems. I'm not looking to add big power like N20!

Anyone else have some experiance?
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Easy number5 there was a post with a bunch of porn links in it to ta tranny site. It has been removed now.:peelout
 

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How safe is propane for a diesel engine? im really looking for better mpg but a few hp wouldn't hurt either, im just more concerned about doing damage to my truck than anything.
 

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Update on DPI.
Monday I received the controller back from MSD, and got it installed after work. Tuesday, I filled the tank with 12-gallons of propane (about 3/4 tank). The cost with tax was $28.40 or 2.27 per gallon.
I drove about 15 miles back to work, and the over head MPG was showing around 30 MPG? (unloaded.) After work, when I got home I could smell propane and started double checking the connections. I found the fitting at my propane filter was leaking (the fitting split down the side.) Thankfully the propane tank has the electrionc shut-off at the tank so when the truck (or propane system) are shut-off, it closes.
Anyhow, I am not sure how much propane the leak wasted. A trip to Lowes Hardware for a new fitting and the problem was fixed.
So far I only have about 50 miles on the system, but in combined highway and city driving, the overhead is showing an increase of around 10+ MPG over what it normally reads. This is whith the propane settings at 50%, starting at 3psi of boost.

Even at 50%, you can tell there is extra power. I set it to come in at 3psi because the truck actually gets decent fuel mialage when driven at boost levels below that.

The big question is how to setup the propane settings for best combined fuel mialage? Adding more propane, or adding it earlier will show increases in Diesel Mialage, but use more propane.

Anyhow, I should be drag racing the truck Friday, and my put a few hundred miles on it over the weekend. This should get me some more data points for comparison, and allow me to hand calculate the mialage.
 

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Kinda an old thread but I didnt wat to start a new one. Im putting together my DIY Propane kit and need to know about the kind of hose everyone is useing. Will regular fuel line work for the low pressure side? Its not the pressure I worry about. Will the propane eat the lines at all? I dont think so cause if Gasoline wont I dont think propane will. Do yall think that Fuel line will be ok? Also, how are yall connecting the propane feed nozzle to the air box? Pics would be good.
 

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propane doesn't have any corrosive properties compared to that of diesel or gas so I'm thinking your safe. How much are you building this kit for?? Share the wealth...
 

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So far, I have zero dollars in it and only still need the lines and the boost switch. I had most of the things I needed laying around. I used a spare Acetylene regulator I had, a spare propane tank I had, and pulled an electric bottle opener valve off of an old RV. 1/4" Fuel line is $0.70 per foot and the boost switch is ~$25 on E-bay.
 

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Discussion Starter · #48 ·
I kinda forgot about this thread :popcorn: Are you going to try the venturi in the intake manifold?
 

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I kinda forgot about this thread :popcorn: Are you going to try the venturi in the intake manifold?
No, Im just gonna feed it into the air box. Ive kinda made it a personal mission to get 25mpg outta this truck so I am going to try this as well as a hydrogen generator and see which works best.

Also, I just found out that the electric solenoid valve I had was dead so I had to order a new valve. Got a new Solenoid Valve off of ebay for $27 shipped and went ahead and ordered the Hobbs pressure switch as well for $29. That brings my total up to 56 and I still need about $30 more in lines and fittings. FOr Im gonna be in for ~$90 all said and done.
 

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Discussion Starter · #50 ·
No, Im just gonna feed it into the air box. Ive kinda made it a personal mission to get 25mpg outta this truck so I am going to try this as well as a hydrogen generator and see which works best.

Also, I just found out that the electric solenoid valve I had was dead so I had to order a new valve. Got a new Solenoid Valve off of ebay for $27 shipped and went ahead and ordered the Hobbs pressure switch as well for $29. That brings my total up to 56 and I still need about $30 more in lines and fittings. FOr Im gonna be in for ~$90 all said and done.
25 MPG with a 4" lift and 35's :beer
 

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Have I missed the tank. Do have to have the DOT tank or what. :popcorn:
 

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Anyone care to post a parts list on a DIY setup?
 

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That didn't come out right. :lol3:I get the plumbing. But I'd like to mount the tank under my truck.:popcorn:
 

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I have access to a lot of forklift parts, they may come in handy.
 

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Theres a couple liists already posted but I will post what Im using.

20Lb BBQ Propane tank
Acetylene regualtor
1/4" solenoid valve
2psi Hobbs Boost switch
1/2" Fuel hose
Various fittings and connectors


I knw 25mpg with my truck is optistic but if I fall short by even 3 mpg thats still 22mpg!!
 

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:$: Just re-filled, mialage results for 100% setting on the DPI are not great.
Background of this test:
miles drive = 332
Diesel used = 17 gallons
Propane used = 11.5 gallons? (somewhat less, the kid overfilled the propane tank!)
Driving conditions: Ok this may have been part of the mialage killer.. 80% of the miles were short trips (3 to 5 miles) in stop and go traffic with speeds under 40 mph, but on the highway propane useage was very high.

FWIW, the overhead computer was way off showing 25.3 mpg.

This seems to be the classic example of "if a little is good, more is NOT better."
I believe that at 100% setting the engine is overfuled on propane. At highway speeds it felt like the truck was being fueled almost entirely on propane, with just small amounts of diesel to start the combustion process.

Anyhow, power was good, but mialage was not any better than when I first ran the system at 50%.

Currently testing at 50% starting at 1 psi boost. More results in a few weeks.

I think for a mialage improvement system, a DIY system might be a good option. Possably using two stages. One stage to inject a small amount at about 1-2 pounds boost, and a second stage to increase the propane flow around 10-20 lbs of boost.
 

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I would ony use it for milage on the hwy. Maybe set it at 30% and set it to come on above 3psi. I think your probably using way more propane than needed for just a milage gain.
 

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I would ony use it for milage on the hwy. Maybe set it at 30% and set it to come on above 3psi. I think your probably using way more propane than needed for just a milage gain.
your correct. I am running it at several settings and hand calculating the fuel mialage and amount of fuel(s) used to I can plot the data and verify the results.

lowering the turn on point helps with in-town stop and go mialage. currently the controller does not allow you to adjust the injection map settings, just the overall percentage of total ingection capacity.
 

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Ok. My last question... What do yall do inside the air box at the point of introduction of the propane? Just run the hole wide open? Some kind of fogger? A single orifice of a certain size? What yall think? Im only gonna run 2-4psi.
 

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Latest mialage update:
Running the Propane Settings at 50%, starting at 1psi.
Miles traveled = 520
Gallons of Diesel used = 26.5 @ $4.619 per gallon.
Gallons of Propane used = 9.? @ $2.20/gallon + tax
(I din't see the pump reading, but that is what was on the bill of sale.)

Anyhow, at the 50% setting my mialage was better than with the 100% setting, and at this level it appears there is a small savings of about 1.5 to 2 cents per mile. (I dont have hand calculated mialage numbers for these driving conditions on Diesel only?)
Again, driving was mostly short trips to work and the store, not much highway driving. On the highway, I would expect to see bigger improvement in mialage.

I am thinking of going to a 30% setting for the next few weeks, and see the results from that....
 
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