changing engines 8V71 to a 8V92 - Page 2
 

changing engines 8V71 to a 8V92

Started by DavidCA, November 12, 2016, 06:48:30 PM

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edvanland

we have a MCI 7 with 8v92 and Allison 740. I have driven it for 14 years fighting overheating all the way. I did everything that was suggested. I would get between 4.5 and 5 MPG no matter what speed or what I was towing. I thought about what to do for about 2 years and was about to say to hell with buses and quit. I finally just did what I had been studying. I purchased a grill off a Freightliner, had to make it look good, then a 3 foot by 4 foot radiator from a cab over diesel, that way it already had a heavy frame work around it. I removed the rear doors and mounted the new radiator to two receivers on the back, never did know why they were there, on a swivel so I could swing the radiator out about 30 degrees. This is mounted in series with the original radiators, I had them recorded shortly after I purchased the bus. This new radiator has a 1/4 inch coper tubing mister system tied into the original mister I had that is 22 feet long with 40 thousand's holes drilled every two inches. For cooling it has 6 cooling fans sucking air from the rear blowing toward the engine. These fans are all fused to a 60 amp fuse but each is fused with a 20 amp fuse that way if one fan goes bad or blows a fuse there is still 5 blowing air. Since doing this I have gone more than 4000 miles towing a 24 foot toy hauler, flat bed trailer with our Jeep on it and also solo. I only have to hit the misters on a real long grade. I have also gone from the previously mentioned mileage to 6.2 so I am one happy camper. The problem I am having now is keeping it below 2200 RPM and 70 MPM. People said it would not work, it does. And by the way to make it look real good I had bright diamond plate aluminum bent to cover the frame work along with some lights.
It works for me.   
Ed Van
MCI 7
Cornville, AZ

MB LeMirage

Ryan D.
1980 Prevost LeMirage
8v71n 6spd Manual
Ste Genevive M.B.

chessie4905

If you are serious, most 8v-92s are already turbocharged, so the cost is going to be lower than the turboing an 8-v71. Also you can use a lower horsepower version- 350 to 400. Still have much more torque than what you have, much longer life to rebuild, cleaner running, much less heat to radiators, and better fuel consumption. And can set cruise speed to lower rpm with rear gear change.
GMC h8h 649#028 (4905)
Pennsylvania-central