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Old 12-27-2006, 09:12 PM   #57
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Ron,

I had decided before I bought my LY that I wanted a GV and the Banks Power Pack. We drove the MH FRom Grand Rapids, MI to Jacksonville, FL and I made arrangements as soon as I could to get the GV and Banks installed, along with some other chassis work I wanted done.

We are delighted! I don't get the RPM drop you get, but I'll take 2500 vs 3000 RPM any day! Hopefully, we'll get better gas mileage, also, but even if we don't, the GV was worth every penny we paid to have it installed.

There is a way to determine your gear ratio -- the next time you have the coah up on jack stands, mark the driveshaft with a piece of chalk and turn one of the wheels one complete revolution. Number of revolutions on the driveshaft (i.e. 4.5) for one revolution of the tire is your final drive ratio.

Now, I realize that it is not too often that our coaches get up in the air like that, but should you ever have it off the ground and are still curious about your final drive ratio, that is one way to find out.

FRank
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Old 11-29-2007, 01:18 PM   #58
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cummins/allison source

I know this is an old thread, but every time I drive my MoHo I think about how nice a 5.9 cummins would be on power and efficiency. It will be another 3-5 years before I do this conversion, but I'm always on the prowl for advice, and a source for a donor vehicle. I was surprised to find out that a lot of early 90's school busses have this combo, and you can buy the whole bus for pretty cheap; 2500-4000. I found plenty of them on craigslist, but here's another source: Welcome to First Student there's about 21 of them in Oregon right now, and most are 5.9 cummins/4sp Allison.

cheers!
-Kevin
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Old 11-29-2007, 01:37 PM   #59
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Kevin,
I think about it a lot but lately when I'm filling up the 345 I really think about it.

What do you think about the Isuzu four bangers? Here is a post I put on ThisOldRV.com about a recent opportunity to buy this motor cheap:

OK, so I'm just spitballing here but I recently was presented with an opportunity to purchase an Isusu Box truck for not a lot of money which uses the Isuzu 4HE1TC turbocharged engine. The truck is a refer 16' at 14,500 GVW. A check on the Isusu commercial site shows this engine in their N series trucks up to 17,500 GVW.

Specs on the engine at 175 hp @ 2,700 rpm and 358 ft-lbs @ 2,000 rpm.

Maybe I'm crazy but since the 454 is a 240 horse / 355 torque motor....is it feasable to consider a 4 cyl engine as a replacement in my 16,500 lb Airstream? Seems like the torque is there but will the HP be an issue?

This is a complete truck along with the tranny (4 speeds with ODrive) and all of the bits and pieces.
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Old 11-29-2007, 02:06 PM   #60
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Reality Check - Weight!

I've bit my tongue on posting to this thread before, but if you are seriously thinking of a swap by all means check how much weight allowable you have left on the front axle. 4 cylinder swaps excepted.

I am almost over the allowed with just the changes in the interior.

Remember, the P-3X is basicaly a one-ton chassis, and most of these 345's have been sitting with a full 4 tons on them for 25 or 30 years.

I would have to think long and hard about what sort of a benefit - and how long it would take to pay out - before I dropped a Diesel into a 345 P Chassis.

Of course, with a 4 cylinder Isuzu under the dog house (pun intended) I would have PLENTY of time to think about all sorts of things while I accelerated (or tried to) into merging Interstate traffic.
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Old 11-29-2007, 02:30 PM   #61
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Aw heck, why not just drop in an LS7? Fuel economy might be close to that of the diesel. A well maintained gasser could last 20 or more years too. An LS7 has 505hp and 470ft/lbs....and it won't take hours to get to speed either....

In all seriousness, outside of a MH application, I have been kickin' around the idea of putting the LS7 into my Suburban. Most likley won't do it, but can you for even a second, imagine an LS7 powered Burb?
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Old 11-29-2007, 04:20 PM   #62
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Steven - I dunno. I've been there with swaps... gas to gas. the mechanical bits are the hardest.... is this electronicly controlled? I suppose the motor mounts wouldn't be so hard to fab, it's tying the whole ball of wax together that's the hard bit.

I don't think you'd miss too much power (other AS have the Izuzu, no?)... but some of those box trucks have been put away HARD...... Cheap at first may not be so later....

Those school busses seem neat - how about a full chassis swap? Get a Bluebird or other cabover, section the chassis, and look what you'd have?

Or gut their motors....school bussses have to be maintained to a certain level.....

You definately use your mh alot, I'm sure you might see some upside to a swap. I'd love to put a cummins in my Dodge 1 ton van. Then it'd be closer to what I need.

Marc
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Old 11-29-2007, 04:56 PM   #63
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The donor is a complete 2000 truck, everything works and has been well maintained (I know the owner). It's a refer and the box is worth the price of the truck. Hard to think about a 4 banger in there but it's a modern turbo intercooled electronic everything. I could gut the truck and get everything from one place.

I also noticed some of these box trucks came with 5.7's in them (the gas version) so the mounting question seems somewhat easier to me after learning that.
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Old 11-29-2007, 05:58 PM   #64
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Fascinating Ideas

Having the tools, all the parts, the skills, the patience, available space and time is quite a feat.
Do you have all these things? Or at least enough drive to compensate for not enough of any other?
If so I wish I was close enough to offer a hand.
Do you have the moral support from "She who Must Be Obeyed"?
How many miles on the motor and transmission?

R
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Old 11-29-2007, 08:09 PM   #65
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Will it be enough?

Steven, the Isuzu 4HE1TC turbocharged engine with direct injection is rated at 175 gross hp at 2700 rpm, with 347 lb.ft. gross torque at 2000 rpm. Is this really enough to move a 345 down the highway even though the GVW of the donor truck is 14,500?
I think this engine is more suited for a metropolitan enviroment.
Jeff
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Old 11-29-2007, 08:44 PM   #66
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Less hp than the 454 but my specs show 358 ft lbs which is more torque than my 454 and at 1000 rpms less.

The engine comes in N series trucks to 17,500 lbs. My 345, fully loaded has a gross of 16,5000 lbs.

Rob - Yes, I have the time, place, tools and the like. The coach already has 200,000 + miles on it (my 345 that is).
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Old 11-29-2007, 09:19 PM   #67
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The motor and Transmission?

Quote:
Originally Posted by swebster
................................................
The coach already has 200,000 + miles on it (my 345 that is).
I did a transmission swap without replacing the clutch. Guess what? The clutch went.
I did what I call poor economy and it cost me the cost of the labor to pull the transaxle and replace it and the clutch. My rambling is leading to ask the question the soundness of the motor and transmission is all.

R
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Old 11-29-2007, 11:00 PM   #68
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I guess my only thought is how hard would it be to add modern electronics to your older MH. Speedometer for example. I think the computer would take it's readings off the tranny, but harness issues could be a factor.

How hard will it be to cool that intercooled turbo?
Marc
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Old 11-30-2007, 07:54 AM   #69
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Well....I need to investigate the donor powertrain. I do know it's been well maintained and it was purchased new by the owners. On things like the speedo and gauges...well the donor has all of them so perhaps they swap too. The dash of a 345 is a big flat metal plate with pretty lousey guages in it already. One of the things I like about a donor swap is that all of these little things are there and usable and already work in the donor so moving them over too is a possibility. I also like that I can drive the donor around, get a feel for the power (or lack of) and understand all of the systems before a swap. Seems better than buying a rebuilt or takout engine from a yard and then having to figure everything out.

I also need to find out what the engine/tranny weight as Dennis pointed out the P30 is limited in what it can hold up. Right now this is all just spit balling. I do like the idea of a four cylinder TD 345.....I would certainly have a very unique forum signature
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Old 11-30-2007, 09:28 AM   #70
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Regarding the front suspension, when I had Henderson Line-up (manufacturer of the Super Steer products) go through my front end they replaced my front coil springs with and did away with the airbags. I'm sure you could replace your springs to handle additional weight.
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