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Old 02-11-2018, 12:29 PM   #1
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MCI-8 Engine/Trans

Anyone have any input on this engine/tranny combination? 8V71 Detroit Diesel rear engine drive with 740 Allison automatic transmission. We are looking at a 1978 MCI-8 Charter Bus thats partially converted but I know nothing about this engine/trans combo...


Thanks!
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Old 02-11-2018, 12:34 PM   #2
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My first bus was a 1980 Eagle 10 with that drivetrane. I loved it.

When I bought the bus it had less than 40k miles on rebuilt engine and transmission. I drove it over 200k miles. Very reliable.
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Old 02-11-2018, 12:54 PM   #3
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You might want to verify if the 8-71 is turbo'd, otherwise your engine power is limited. It would be nice to crawl under the bus and see what it looks like, something that only someone who knows how to safely block up the body should do.

As this is an older bus I suppose you are trying to not spend too much, but with that rig you should have a few $10,000 to throw at it.
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Old 02-11-2018, 01:04 PM   #4
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I am not certain but I think the 8v71NA in coach application were available in HP ratings from around 245hp up to 300hp.

Mine was 280 or 285 HP and move my Eagle along pretty well. Could I keep up with the s60 powered Prevost's? Heck no. But it was not bad.
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Old 02-11-2018, 01:06 PM   #5
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Most 8v71's in mci8's are not turbo, rated between 270 and 318 hp, and it is plenty of power. Top speed is over 70, at least on all the greyhound MCI8s I drove
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Old 02-11-2018, 01:13 PM   #6
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When the current owner fired it up, it started in seconds, ran smooth no obvious sounds or issues my inexperienced bus driver ears could detect.

Air filled quickly, airbags raised smooth and easily...idk.

Are there known issues with these things I should be looking for? If we do buy it I will need to find a local bus mechanic to have him go over it entirely.

I know the speedometer, fuel gauge and passenger side wipers dont work...possibly the AC. Still trying to determine some of the outstanding issues.

One of my challenges is its 2hrs from my home so I dont know anyone local to have them look at it.
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Old 02-11-2018, 01:19 PM   #7
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8-71's are solid engines with a long life expectancy...but like anything else...only if they were properly maintained. Running an oil analysis should tell the tale on both the engine & tranny.
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Old 02-11-2018, 01:35 PM   #8
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Quote:
Originally Posted by Tango View Post
8-71's are solid engines with a long life expectancy...but like anything else...only if they were properly maintained. Running an oil analysis should tell the tale on both the engine & tranny.
More great advice from Tango.


Also, find out what oil the current owner is running. The specific oil is important on these engines. Delo 100 30wt or equivalent, low Ash content.

No Rotella or Delo 400 or even Delo 100 10/40wt. All bad news for 2 stroke Detroit's.
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Old 02-11-2018, 01:37 PM   #9
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Great advise, thank you team!

Any thoughts on towing a Jeep or something similar?
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Old 02-11-2018, 01:53 PM   #10
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I had two different toads behind my 8v71. A Honda Accord and a Ford Ranger (v6 long bed).

Both towed fine. On big hills I could tell that the Ranger was back there. The Accord was "invisible".
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