Slant Six Forum :: Anyone do a propane conversion on a slant?

I know they were used as propane burners on forklifts and other such type service vehicles, anyone convert one lately?

I have a 1973 Duster I am considering converting.

Talked to the guys down at the local propane dealer, and no, his name was not Hank Hill.......

Propane is running 1.80 a gal right now, but I would have to hit the propane company in between getting off work and their closing time, a 45 min window. They are also not open on Sunday.

The suggestion they gave was to rent a 500 gal tank from them for 40 bux a year, and they would set it up with a fitting to refill my own tank. Then I would refill the car anytime I wanted, and they would deliver propane to fill the large tank. This way also less taxes. It is a defidefinite" for me now.

I saw the LPG converconversionm Jennings on the net and will use that as a framework for my slant conversion.

I worked at a place that sold Yale lift trucks. The machines using the slant six were the -83 series (L83=LPG, G83=Gasoline), but we converted many in the field to LPG. By far, the most reliable LPG system was the Century brand. We used a kit from LP Gas Equipment Company in Chicago that had everything except the tank in one box. Century was the LPG brand of Marvel-Schebler.

The engines used by Yale were H225 and HB225 spec. #646. The first ones had Chrysler electrics, later were Prestolite. Gasoline engines had Carter or Holley Carburetors. Crankshaft pulley was furnished by Yale as these machines had belt-driven hydraulic pumps and required more grooves.

Engines ran long and clean on LP.

Author:	pneps [ Mon Apr 30, 2007 10:53 pm ]
Post subject:	Anyone do a propane conversion on a slant?
I know they were used as propane burners on forklifts and other such type service vehicles, anyone convert one lately? I have a 1973 Duster I am considering converting.

Author:	icaneat50eggs [ Mon Apr 30, 2007 11:02 pm ]
Post subject:
There is a guy on here named Frank Raso, do a search, he seems to be the resident expert.

Author:	VG-265 [ Tue May 01, 2007 1:46 am ]
Post subject:
I have a 265 Aussie 6 on straight LPG(propane) It has only been done for a few weeks and I have just started tuning. The first tank of LPG did 211 miles to 62 Litres, about 15 miles to an Imperial gallon or 13.5 miles to a US gallon over a 50/50 mix of city and highway driving. The highway driving was at 75 Mph on relatively flat roads. On petrol I was getting about 20% better fuel economy. I am confident they economy will improve with tuning. Overall power is much the same, and drivability is improved. For us in Australia, the price of LPG (54.9 CPL) is much lower than petrol(139.9 CPL for premium 98). Once my system is sorted, I am doing a blow through intercooled turbo. If everything goes good with all this, I will convert a 225 slant to LPG/turbo also.

Author:	Charrlie_S [ Tue May 01, 2007 5:14 am ]
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Haven't done it, yet, but have most of the parts to do a blow thru turbo propane setup on a slant six. Maybe next year.

Author:	pneps [ Tue May 01, 2007 7:39 pm ]
Post subject:
Looks like I will be going ahead and setting up my slant for propane. Gas hit 3.35 for regular here today.

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Anyone do a propane conversion on a slant? https://www.slantsix.org/forum/viewtopic.php?t=22981	Page 1 of 1

Author:	CrAlt [ Tue May 01, 2007 9:14 pm ]
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Anyone have links to some LPG kits? I helped rebuild an old YALE forklift that had a slanter on propane. The carb was super small and wouldnt but usefull on a car.

Author:	VG-265 [ Wed May 02, 2007 5:43 am ]
Post subject:
Two small gas carbs on a twin carb manifold would work though.

Author:	440_Magnum [ Thu May 03, 2007 11:19 am ]
Post subject:	Re: Anyone do a propane conversion on a slant?
Quote: I know they were used as propane burners on forklifts and other such type service vehicles, anyone convert one lately? I have a 1973 Duster I am considering converting. A friend of mine who posts here as "Daddiojoe" just converted his slant-6 pickup. I saw the setup for the first time Tuesday, and its very nice. He's running it open-loop right now, but the system he's using has an input for a controller that reads an O2 sensor and trims the mixture, which should further improve efficiency. I gotta say, the idea is VERY tempting, especially since my 440 already has too much compression for its own good (LPG likes more compression than gasoline). But I fear that driving range for a 440 powered C-body with the size tank I could fit in a 4-door wtihout giving up my entire trunk might not be too good.

Author:	Daddiojoe [ Thu May 03, 2007 4:33 pm ]
Post subject:
Hey 440, you'd probably be correct about driving range. As the man said, I am running an open loop right now, and the driveablity and response is just as good, better since I don't have to wait for it to warm up. On sweet lady propane my heavy auto-transed 71 D100 got 11.2 mpg to and from Houston at speeds over seventy about half of the time. I'm embarassed to say that I got around 13 mpg city driving before this. So I haven't lost much. Today I filled up for $2.50 per gallon. Which still isn't great. Once I get in tune, I'm looking forward to better mileage. Also, I need to put my tailgate back on. I have some questions, but I'll put those under another topic. One of the best things about propane I think is the hydrocarbon reduction. I'll keep you all posted, Joe

Author:	pneps [ Sun May 06, 2007 5:20 pm ]
Post subject:
Talked to the guys down at the local propane dealer, and no, his name was not Hank Hill....... Propane is running 1.80 a gal right now, but I would have to hit the propane company in between getting off work and their closing time, a 45 min window. They are also not open on Sunday. The suggestion they gave was to rent a 500 gal tank from them for 40 bux a year, and they would set it up with a fitting to refill my own tank. Then I would refill the car anytime I wanted, and they would deliver propane to fill the large tank. This way also less taxes. It is a defidefinite" for me now. I saw the LPG converconversionm Jennings on the net and will use that as a framework for my slant conversion.

Author:	CrAlt [ Sun May 06, 2007 5:53 pm ]
Post subject:
Quote: Talked to the guys down at the local propane dealer, and no, his name was not Hank Hill....... Propane is running 1.80 a gal right now, but I would have to hit the propane company in between getting off work and their closing time, a 45 min window. They are also not open on Sunday. The suggestion they gave was to rent a 500 gal tank from them for 40 bux a year, and they would set it up with a fitting to refill my own tank. Then I would refill the car anytime I wanted, and they would deliver propane to fill the large tank. This way also less taxes. It is a defidefinite" for me now. I saw the LPG converconversionm Jennings on the net and will use that as a framework for my slant conversion. Thats a good idea. I know some people at a fuel company and could prob get a deal on the tank. BUT I dont think there is anyplace in CT that would fill my car. And im a little unsure about the regs on a LPG powered car. I think thats a big sticking point around here. I dont need my ride inpounded because it doesnt meet some DOT reg.

Author:	tgo15hdb [ Tue Apr 15, 2025 2:18 pm ]
Post subject:	Re: Anyone do a propane conversion on a slant?
I worked at a place that sold Yale lift trucks. The machines using the slant six were the -83 series (L83=LPG, G83=Gasoline), but we converted many in the field to LPG. By far, the most reliable LPG system was the Century brand. We used a kit from LP Gas Equipment Company in Chicago that had everything except the tank in one box. Century was the LPG brand of Marvel-Schebler. The engines used by Yale were H225 and HB225 spec. #646. The first ones had Chrysler electrics, later were Prestolite. Gasoline engines had Carter or Holley Carburetors. Crankshaft pulley was furnished by Yale as these machines had belt-driven hydraulic pumps and required more grooves. Engines ran long and clean on LP.

Author:	bcschief [ Tue Apr 15, 2025 5:07 pm ]
Post subject:	Re: Anyone do a propane conversion on a slant?
Quote: I worked at a place that sold Yale lift trucks. The machines using the slant six were the -83 series (L83=LPG, G83=Gasoline), but we converted many in the field to LPG. By far, the most reliable LPG system was the Century brand. We used a kit from LP Gas Equipment Company in Chicago that had everything except the tank in one box. Century was the LPG brand of Marvel-Schebler. The engines used by Yale were H225 and HB225 spec. #646. The first ones had Chrysler electrics, later were Prestolite. Gasoline engines had Carter or Holley Carburetors. Crankshaft pulley was furnished by Yale as these machines had belt-driven hydraulic pumps and required more grooves. Engines ran long and clean on LP. You raised a post from the dead 2007

Author:	SlantSixDan [ Wed Apr 16, 2025 1:06 pm ]
Post subject:	Re: Anyone do a propane conversion on a slant?
Quote: I worked at a place that sold Yale lift trucks. The machines using the slant six were the -83 series (L83=LPG, G83=Gasoline), but we converted many in the field to LPG. By far, the most reliable LPG system was the Century brand. We used a kit from LP Gas Equipment Company in Chicago that had everything except the tank in one box. Century was the LPG brand of Marvel-Schebler. The engines used by Yale were H225 and HB225 spec. #646. The first ones had Chrysler electrics, later were Prestolite. Gasoline engines had Carter or Holley Carburetors. Crankshaft pulley was furnished by Yale as these machines had belt-driven hydraulic pumps and required more grooves. Engines ran long and clean on LP. Cool info! We don't get a lot of first-hand experience with the industrial Slant-6 applications around here, so thanks for speaking up.

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Author:	Charrlie_S [ Wed Apr 16, 2025 4:05 pm ]
Post subject:	Re: Anyone do a propane conversion on a slant?
I had plans of doing a turbo/propane slant at one time. Got a lot of parts, but never did it. I have an Impco propane system for a Ford/Holley 2 bbl manifold pattern, and a Rajay turbo.