8V92 swap into MC8

[MC8Mike]

I've searched the site and have not been able to find the answers I've been looking for. I'm sure this has probably been brought up many times so I'll apologize for covering old ground to start out. I'm finally able to get back to working on the bus and the engine swap is next. I have a rebuilt 8V92 in truck configuration and I'm wondering if my oil coolers from the 71 will fit? My other main concern it the front mount, rear on the bus, will interchange? I believe I have a flywheel housing that will work and I know I need a different pan and pickup. A good source for the needed parts would be of great help and any other insights into doing this swap would be greatly appreciated. I already have the 102 rads installed and the smaller blower pulley. Along with the larger squirrel cages. Thanks in advance for your help.

[bevans6]

I put a military engine in my bus and went through some of the same "how do you make it fit" issues.  Here is my write-up, hope it helps, ask any question you might have after you read it.

http://www.busconversions.com/bbs/index.php?topic=21836.0

I frankly can't believe I wrote that up almost three years ago and not one person has found it worthy of a simple comment.  Pisses me off.

Brian

[muldoonman]

Is the 8V71 the same fit/size as the 8V92? Inquiring minds want to know.

[luvrbus]

The front mount will not work,the double oil cooler will work and Brain knows the rest of the story I have the bus pan for a 92 series, it's best since you have a truck engine to use the front mount and fab you a cross member. Unless you can find a new governor housing for a MCI one from a 71 won't work because on the 8v92 the cam goes through the governor housing the bell housing has to be from a 8v92 the 71 series will work on a 6v92 but not on the 8v92  plenty of work ahead for you

[bevans6]

The short version of my story is you take the engine out of the bus, the engine out of the truck, stand them side by side and take off all the not-bus stuff off the truck engine and install all the bus stuff on it from the bus engine.  Harder and easier than it sounds...

Brian

[luvrbus]

You do know the 8v92 has to be mounted towards the front of the bus 2 inches to make the belts line up for the blower fans unless you can find the shorter pulleys ? is the top mounted turbo going to clear

[MC8Mike]

Yes I know that the 92 crank is a couple inches longer than the 71,thanks.

[TomC]

Even though you have the 8V-92TA, I would nix it in favor of a Cummins M11/ISM or a Cat C12. Unless they are just plainly too long. Good Luck, TomC

[MC8Mike]

I'd love to go with a 4 cycle engine but I'm afraid I'm too far down road with the 92, funds would not let me change direction now.

[luvrbus]

Why would anyone swap a 8v92 for a M-11 I have been around a lot of those in buses what do gain the fuel mileage is about the same  and they leak over time

[Emcemv]

Mike, you will love the 92, it fit well into our 7 and it flies! Our fuel mileage is just over 6mpg. I did not do the conversion, it was done by the PO at a local DD dealer here in CT. 

[akroyaleagle]

I changed my 8V71N to a 8V92TA(500HP). Here is some information for you to consider:

There are a LOT of over the road trucks running around at 80,000 pounds with the 495 converter.

With the 92 your shift points should be:

1-2 1900-2050 rpm
Lockup - 2000
2-3 2025-2100
3-4 2000-2100

The HT740 is part # 6884538. You should recalibrate the valve body to part # 23040804 Specs.

The 495 converter is 2.391 ratio, 496 is 1.78 ratio.

Upon the advice of a lot of experienced folks I know I did NOT change the converter. Mine works great but I do not hammer it from a stop. I use the power to climb.

Here are some of the parts you will need:

8928605 low profile blower housing (could be 8922167)
5104464 low mount engine bell housing from a Ford Truck with a 6v92 or 8v92
9402015 crankbolts (12)
23045507 adapter hub, flexplate to crank
5143106 Y manifold
8922502 front turbo brackets
E8927027 Garret Turbo A/R .81
5101174 double cooler w/wp pipe
A BIGGER RADIATOR!!!!!!

Be sure to plug the 2 holes (5/8")between the blower and govenor housing!

Drill the lube orifice for the front blower bearing if you go with the optional turbo mount.

I do not know the SN of your engine. I assume it is a Silver. It should probably have 9G90 injectors.

For what its worth, if you allow someone to patch this engine in, you will probably end up with a lot of money in it and never be happy with it.

I would pull the transmission, have it recalibrated, dyno it and use the same torque converter. Install a larger radiator.

[Oonrahnjay]

I changed my 8V71N to a 8V92TA(500HP). Here is some information for you to consider:

....    5101174 double cooler w/wp pipe
A BIGGER RADIATOR!!!!!!

... Install a larger radiator.   

      Gee, Joe.  You'd think that you really believe that a larger radiator is a good thing! 

[MC8Mike]

I appreciate all the advice, nice to hear from those that have gone before you. I already have some of the parts to make the change over, flywheel housing from a Ford cabover that had a 92 in it, crank hub and flex plates. My 92 is a 1979 silver, 8vf036941 from the data plate, has 9a90 injectors, 435hp. I installed 102 rads a couple years ago, the original MC8 rads barely keep the 71 cool running around out here in the summer desert heat. I'm really looking forward to the HP, I have a retired trucker buddy that drove tour buses for something to do after he retired and he was impressed with the buses that had the 8V92 engines in them.
Thanks again for all the advice.

[luvrbus]

Some of the parts Joe mention does not apply to a MCI like the turbo mounts the radiator does