Author Topic: Engine Question  (Read 2700 times)

Offline 5B Steve

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Engine Question
« on: January 15, 2013, 09:05:09 AM »


  I thought I might ask , would a rebuilt 8V-71T truck engine work in a bus and is there any changes that need to

  be made. The reason that I ask a friend of mine would like to replace the engine in his bus.

  Thanks in advance.

  Steve 5B......

Offline TomC

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Re: Engine Question
« Reply #1 on: January 15, 2013, 11:44:07 AM »
No real differences between a truck and bus engine except-the bus engine typically had smaller injectors. The truck 8V-71N had 318hp and 860lb/ft torque. The Bus 8V-71 had 270hp and 730lb/ft torque. Same with 8V-71T (non aftercooled). Truck was 350hp and 930lb/ft torque. Bus is 304hp and 800lb/ft torque. Depending on if you have an automatic or manual is what you should run. Better startability with an automatic, hence larger injectors work well with the automatic. Good Luck, TomC
Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.

Offline Sam 4106

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Re: Engine Question
« Reply #2 on: January 15, 2013, 01:17:20 PM »
It depends on what brand bus it is going into. A truck engine wouldn't be usable in a bus with a crossways 8V71, they require a left hand engine. In some buses an 8V71T truck engine would require a lot of modification to work. No easy answer until you tell us what bus the engine is going into.

Good luck, Sam
1976 MCI-8TA with 8V92 DDEC II and Allison HT740

Offline RickB

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  • 81 MCI 9 smooth side 8V71 Allison 754
Re: Engine Question
« Reply #3 on: January 15, 2013, 03:34:42 PM »
If it's an MCI Bus you will need a different bellhousing or you'll have to switch to a belt driven alternator in the front. Obviously, if you're pulling  it from a truck with a manual transmission and putting it in a bus with an automatic you'll need a flex plate and quite possibly a different bellhousing as well

I will drive my Detroit hard... I will drive my Detroit hard.

Offline bevans6

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Re: Engine Question
« Reply #4 on: January 16, 2013, 04:46:09 AM »
Read my project page on military engines to see what some of the issues might be, if it's an MCI bus.

1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Allison MT-647
Tatamagouche, Nova Scotia