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Gas to diesel conversion

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10-07-2007, 03:17 PM
izomage
Gas to diesel conversion
Somewhere buried in this forum is a very informative discussion about sticking a diesel in a gas coach. If I, or someone else finds it, maybe we should link it to this thread. I think the topic deserves its own identity. If Dave Bowers were still patrolling these waters I would dare not mention the other F word but I'll take a chance now. In looking over Foretravel specifications I notice that 460 ford / oshkosh combos were also available with 5.9 Cummins as an option. This leads me to believe that it would be doable on a 460 Barth, especially a tall one. Of coarse the rear ratio was different, the front and rear axle rating were different, the wiring harness and rats nest under the dash would have to be dealt with, but still I wonder. Those more knowledgeable than I feel free to step in here.
10-07-2007, 03:58 PM
bill h
I think you're onto something there. A late model 5.9 from a wrecked Dodge pickup would be a possible source. That 5.9 became less and less anemic almost every year. Hunt down some owners and get opinions on which years to buy.

Find a Foretravel site or club, meet a few 5.9 owners, and invite yourself over with a camera and a tape measure. Don't tell them you are considering a non-Foretravel. Heck, you might even end up getting a Foretravel. They are very good coaches.

I considered a Duramax in my Pee Thirty-something, but crossmember issues and the non-availaility of a donor vehicle in 2000 put the kibosh on that one.


.

84 30T PeeThirty-Something, 502 powered
10-07-2007, 07:53 PM
Don in Niagara
What about this conversion in that 34' Regal gas pusher with Oshkosh/ 460/ Allison combo??
When I looked at that coach last spring, one thing that really stuck out was the Ford 460 looked like a pea in a gallon jug, the engine compartment was so large! Would the trick be mating up the engine to the tranny, since things are facing astern?
Don


1990 Regency 34'
Cummins 6CTA 8.3 240hp
Spartan Chassis,
4 speed Allison MT643
10-07-2007, 11:24 PM
izomage
I think it was Ed Chevalier who first pointed out that the 460 pusher looked like an ideal candidate for a diesel transplant. Sounds like there is enough room for a 3208 in there. I thought the pushers spun backwards, that is in relation to pullers. I know the 8v71 in my gmc pusher spins opposite the truck engines. I've been told you can reverse those engines if you have the knack.

I really should go take a look at that 460 pusher, its not that far from me really, but I told myself to stay under 30 ft. so will exercise a little self control for a change.
10-08-2007, 05:41 PM
Gary Carter
A much easier converson for the 460 is a 6.9/7.3 International (Ford pu). Just find a wrecked Ford P/U for the doner and you have every thing you need. Personally would use a 7.3Turbo. Since the binder engine is a V8 you don't have the extra length of the 6 cylinder to worry about. This is especailly true if you are change out a front engine.

If you have a front engine and really want to do it right (purse strings) find a late model 6.0 liter. These are a lot quiter under the front dog house.

Keep in mind it would be best to get the engine and transmisson as a set. You would also get an overdrive transmission allowing for lower operating RPMs and therefore better MPG.

BTW pushers are still right hand engines. In the GM buses the engine was sitting sideways so it was easier to spin it left hand to make the 90 degree bend. When they switched to 4 stroke engines it was harder to spin the left hand so the put a reverser in the 730 transmission and made it a R731.


'92 Barth Breakaway - 30'
5.9 Cummins (6B) 300+ HP
2000 Allison
Front entrance
10-08-2007, 06:04 PM
bill h
quote:
Originally posted by Gary Carter:
When they switched to 4 stroke engines it was harder to spin the left hand so the put a reverser in the 730 transmission and made it a R731.


Hmmm..........lots of GM 4 cycle gassers were made in reverse for boats. I even reversed a Corvair engine when I flopped it. Just a different cam and distributor, as I recall.

Is there something different in diesels that makes reversing more of a problem?


.

84 30T PeeThirty-Something, 502 powered
10-10-2007, 11:31 AM
Gary Carter
Not certain why they don't do left diesels anymore. The only left hand 4 stroke that I know of was the 903 Cummins V8. I know on some of the others it has to do with oil passages designed for right hand turning engines. The other reason may be just to small of a market and it is simplier to just use a reversing gear. Maybe they also have to be EPA recertified again.

I do also know that both Lycoming and Continental make left hand light aircraft engines so that on twin engines you get counter rotating props. This is the same reason that it is available on boats.


'92 Barth Breakaway - 30'
5.9 Cummins (6B) 300+ HP
2000 Allison
Front entrance
10-11-2007, 08:07 PM
Ed Chevalier
Here's an ad for a Cummins from a local website.Cummins turbo diesel engine W/6 speed automatic transmission it comes equiped with all the hardware and ready to install. Includes the radiator and air condition unit and condensor.The unit has less than 25,000 miles it was removed from a 2005 Dodge 1 ton dully. The truck was a total loss from a passenger side impact at the rear dullies. I am asking $6000.00 but am willing to discuss any serious offer. Need to sell. Leave a message and I will return your call.
Date Submitted: 10/07/07

Home Phone: (409) 794-1262


1999 Airstream Safari 25'
2007 Toyota Tundra
1987 Yamaha YSR toads
10-14-2007, 08:45 PM
Rusty
The AMG 6.5L TD (as was the original 6.5L TD) rotates standard - the diffy was flipped side-to-side (so it's upside down). I put a Mag-HyTec cover on it and made a dipstick to check the level.


Rusty


MilSpec AMG 6.5L TD 230HP; built-to-order by Peninsular Engines:  Hi-pop injectors, gear-driven camshaft, non-waste-gated, high-output turbo, 18:1 pistons.  Fuel economy increased by 15-20%, power, WOW!"StaRV II"

'94 28' Breakaway: MilSpec AMG 6.5L TD 230HP

Nelson and Chester, not-spoiled Golden Retrievers

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- Arthur C. Clarke

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