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8.2 Detroit?
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andy1canada
Posted 2018-08-18 9:36 AM (#5767)
Subject: 8.2 Detroit?


Elite Veteran

500100100
Location: Victoria, BC. Canada
For what it's worth, I've been doing a little more reading on this GM 4-stroke.

As most of us know, the 8.2 Detroit 'Fuel Pincher' previously enjoyed significant popularity as the diesel-swap engine of choice for our coaches.

One of my biggest concerns based on previous specs I'd read was the sheer weight of it. Turns out that weight spec I've previously referenced @ 1400 lbs, was likely for the marine version.

The dry weight of the 8.2 is actually almost exactly the same as the Cummins 6BT at just under 1100 lbs.

https://itstillruns.com/82-detroit-diesel-engine-specifications-7557...

However, the design of this engine is not without its faults and I believe these things should be taken into consideration before anyone chooses this engine for a conversion, or, is considering buying one with an 8.2 living in it.

Design issues were especially prevalent in marine applications.

Very good article here: https://www.absolutelyeverythingabout.com/boats/detroit-diesel-8-2/


Terry
#846
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LCAC_Man
Posted 2018-08-18 10:20 AM (#5768 - in reply to #5767)
Subject: Re: 8.2 Detroit?


Elite Veteran

5001001001002525
Location: Oceanside, CA
I can see buying a coach that has a nice running 8.2 conversion and preserving it...but the idea that anyone would buy one (now) and convert it would be crazy. The list of better options (both gas and diesel) for engine/trans conversion is varied and long. The 8.2 was really DD's first medium duty 4-stroke and it had/has some real limitations. I'd sooner do a modern gas conversion than go with an 8.2 nowadays.
In order to make a diesel swap work (for today's hwy speeds) you absolutely must have an overdrive trans which was another issue with a lot of the 8.2 converted FMCs, they used a 545 Allison which not only was not overdrive but didn't have a lock up converter either. The compensation to get hwy rpms down was to install taller tires, while that worked on the hwy, it robbed you of the grunt you need to accelerate.
If you are going to do an engine conversion (not everyone should) then it would be foolish to invest your time and money in anything other than a modern gas/diesel with an electronically controlled o.d trans.

Edited by LCAC_Man 2018-08-18 10:21 AM
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hemi354az
Posted 2018-08-18 12:21 PM (#5769 - in reply to #5768)
Subject: Re: 8.2 Detroit?


Extreme Veteran

50025
Location: Scottsdale, Aridzona
Pick thru these discussions and see if you want to take off to the "other" Coast in anything powered by an 8.2L Detroit Diesel -

https://www.google.com/search?rlz=1C1CHBF_enUS782US782&biw=1920&bih=...

Pinch ON ! Lou #120
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fcrives3
Posted 2018-08-20 4:43 AM (#5776 - in reply to #5767)
Subject: Re: 8.2 Detroit?


Regular

2525
Location: Greensboro, NC
#471 has an 8.2 NA in it right now with the 545 Allison backing it up and what they call a Hi-Speed rear end not sure what that really is or the gear ratio, it is also running 245/70/19.5's or should I say was got a lot of repairs to do before she hits the road again. I have an 8.2 T that I am eventually going to rebuild and swap out just wish I had a different fuel pedal setup.
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LCAC_Man
Posted 2018-08-20 7:27 AM (#5777 - in reply to #5776)
Subject: Re: 8.2 Detroit?


Elite Veteran

5001001001002525
Location: Oceanside, CA
fcrives3 - 2018-08-20 2:43 AM
just wish I had a different fuel pedal setup.

It can't be worse than the hydraulic fuel pedal train-wreck that was installed on 1027 when I got it..
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fcrives3
Posted 2018-08-21 3:46 AM (#5781 - in reply to #5767)
Subject: Re: 8.2 Detroit?


Regular

2525
Location: Greensboro, NC
30 some foot long factory accelerator cable wish I could switch to electronic like you did Len but that exceeds to function of my brain power.
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LCAC_Man
Posted 2018-08-21 8:44 AM (#5782 - in reply to #5781)
Subject: Re: 8.2 Detroit?


Elite Veteran

5001001001002525
Location: Oceanside, CA
just getting a new cable in there would probably help a bunch, they just used common boat/marine throttle cables, this isn't necessarily the exact cable you would need but gives you an idea on pricing/availability: https://www.amazon.com/SeaStar-CCX63330-XTREME-Control-Threaded/dp/B...
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dkarnath
Posted 2018-08-21 9:34 AM (#5783 - in reply to #5782)
Subject: Re: 8.2 Detroit?


Elite Veteran

5001002525
Location: Medford, OR
I was thinking about lubing my cable again before the October Rally. Might use 30w this time. Having a "little bit" stiff cable is good for highway travel when your cruise control don't work!!
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andy1canada
Posted 2018-08-21 10:06 AM (#5784 - in reply to #5767)
Subject: Re: 8.2 Detroit?


Elite Veteran

500100100
Location: Victoria, BC. Canada
I just jam a hunk of 2 x 4 between the pedal and the seat. Have different lengths for different speeds.

Terry
#846
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hemi354az
Posted 2018-08-21 10:38 AM (#5785 - in reply to #5784)
Subject: Re: 8.2 Detroit?


Extreme Veteran

50025
Location: Scottsdale, Aridzona
Terry,
Is there a formula for length vs speed on the 2 X 4s . . . or is this some secret shared only among woodworkers ?
Engine Ears need to know . . .
Saw ON ! Lou #120
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