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Old 11-30-2007, 09:38 AM   #71
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Guy...I wondered about that. My coils are tired now and need replacement. That would be the utlimate. I do wonder about the bearings and spindles and a arms with any significant weight addition but I don't know what the Isuzu weighs yet. I might even be lighter.
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Old 11-30-2007, 10:09 AM   #72
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Hey, how about splicing the new frame with the old frame (just the front end) and make it an "easy" swap? The box truck is a cab over, right? Wouldn't the steering linkage work about the same?
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Old 11-30-2007, 12:00 PM   #73
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It's a cab over. I dunno...seems like more work than fabing some mounts.
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Old 11-30-2007, 12:24 PM   #74
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I think we'll be seeing more threads about the swap! Go for it!
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Old 11-30-2007, 01:08 PM   #75
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So no one has an issue with a 4 cyl diesel?
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Old 11-30-2007, 02:50 PM   #76
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well, smaller - but torque a plenty. I don't think you'll beat any gassers from a stoplight, but you will cruise fine and get better mileage too. I was reading up on the new medium duty Kenworth hybrids. Our local lumberyard was the first customer. It's a big truck with "only" 245 HP. Lot's a torque though.

I think you'd be fine with a 4 cylinder. One thought I had was integrating your steering gear and the new steering pump on the donor engine. Are the psi compatable?

Have you compared sizes of the two powerplants?
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Old 11-30-2007, 05:22 PM   #77
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Quote:
Originally Posted by swebster
Guy...I wondered about that. My coils are tired now and need replacement. That would be the utlimate. I do wonder about the bearings and spindles and a arms with any significant weight addition but I don't know what the Isuzu weighs yet. I might even be lighter.
I'm sure the guys at Henderson know the specs on these parts and would be happy to let you know if you would be overloading these components. When you know what your approximate new front axle weight will be, give them a call, or, if you like, I'll call them.
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Old 11-30-2007, 05:36 PM   #78
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Thanks guys. I don't really need to beat anyone off the line. I'm one of those slow pokes in the motorhome anyway. I typically only travel between 55 and 60 mph and quite honestly I enjoy it. It's a motorhome....I get my speed fix on my road bike.

The isuzu is small compared to a Cummins, 454, etc. I'll take some measurement and pics soon. I'll also try and get the weights.
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Old 12-01-2007, 10:02 AM   #79
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swebster---Have you thought about looking into the Cummins 4bt, the little brother to the 6bt. I hear that they can be hotrodded to make good horsepower and torque. They are also made to mate with the Chevy bellhousing and the P-30 chassis. There are many in sevice in delivery type vans. Just a thought!
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Old 12-01-2007, 10:24 AM   #80
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Quote:
Originally Posted by guy99
I'm sure the guys at Henderson know the specs on these parts and would be happy to let you know if you would be overloading these components.
Well, keep in mind that coaches like ours already have the 6BD1 installed and I believe our front ends are similar. The 6BD1 is heavier I'm sure.
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Old 12-01-2007, 04:10 PM   #81
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I found this place in CO that specializes in putting those 4BTA cummins motors in Land Cruisers.
Proffitt's Cruisers
It's a different swap, but similar in a lot of ways. The reason I mention it here is that they have nice example invoice with a rundown of all the parts and some of the work neccessary. Example Invoice

I know that place in Montana charges about $15k to do a swap like this, and you have to supply the motor.

I think this quote sums it up for me:
"In general, overall fuel savings does not pay for itself with these conversions; most people convert for the unique aspects of the conversion and sometimes to run alternative fuels such as biodiesel fuel"

I think another thing to consider is the increased resale value of swapping to diesel. it seems like no matter the model, the diesels go for at least $10k more than the same unit with a gasser.

Not that I would ever sell my cherished MoHo

-Kevin
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Old 12-01-2007, 06:06 PM   #82
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Kevin,
I don't think I'm looking for a short term ROI on this. Rather, my 454 is appraoching it's end in the coming years and rather than R&R another gasser (it's likely on it's third now), this seems like a better alternative for how we use the coach.

That invoice is great, but I noticed it included things like transmissions and tranny adapter plates and a new exhaust, battery, etc. There were certainly a lot of little things but I'm thinking having the donor vehicle might help to minimize the bits and pieces issue.

All in all they had about $3900 in labor for a conversion. Not as bad as I thought. I would only undertake this project as a DIY and would hope to cronicle it on my site for others.
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Old 12-02-2007, 05:31 PM   #83
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Generator

Quote:
Originally Posted by swebster
So no one has an issue with a 4 cyl diesel?
What about the generator - Diesel? Propane? Add a small gas tank - perhaps an outboard tank mounted someplace?
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Old 12-02-2007, 05:34 PM   #84
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Yeah, LP or a second tank.
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