6v92T truck eng

[pete36330]

I found a 6v92t truck Eng that's in an 85 GMC brigadier truck ,,the owner says that's it never been rebuilt and it's low milage ,,supposedly it had a bad trans ,,he said he would run it for me when I came to look at it ,will it fit in my MC9 with 740 trans?I know some of the accesery gear  boxes will need to be changed,Is it worth the trouble of changing it all out if the Eng is good? Does it turn the right way? What should  I look for as far as serial #s injectors and HP rating,,what else?thanks

[luvrbus]

If you don't have a 6v92 now in you MCI 9 it will cost you dearly for parts and even if you do everything on the rear of the engine has to be changed ,bell housing, rear plate even the gears not a easy deal but doable the oil cooler will take a day to change lol

good luck

[Don Fairchild]

Pete, It is a good engine if yours is blown up. Otherwise as Clifford said you have to change over a lot of things including the camshafts. If you get it for dirt cheap you could send both engines to me and I can change them over for you.

Don

[luvrbus]

Yea the cam shaft that drives the alternator is no easy task you are down to the block

good luck

[Geoff]

I find it hard to believe there is an '85 Brigadier that is low milage!  If you used this engine it comes with an alternator that is mounted directly behind the blower drive.  The engine will be RH like your bus, the only thing I think you may want is an external tranmission cooler like the V730's run.  Otherwise the engine will work with new mounts.  Not sure on the flywheel hsg-- but I bet it will accomodate a 740.

[TomC]

From my experience- it is a whole lot easier to turbocharge the 8V-71 to get more power and better fuel mileage then to change out to the 6V-92TA.  If you do not use the bus much, the 71 series with their dry cylinder liners will be a better choice since the 92 series wet cylinder liners can and do leak if not used a lot (ask about Don Fairchilds 8V-92TA).  The difference between an engine that puts out 300hp and 800lb/ft torque and 375hp and 1125lb/ft torque is quite noticeable.  Hills that I used have to down shift before, doesn't happen, and climbing hills is 10-15 mph faster.  Good Luck, TomC

[Geoff]

Hi, Tom

I get between 7-8 MPG (depending if I am towing or speeding) with my 350HP, 1000ft lbs of torque 6V92TA.  My bus weighs around 34,000 lbs.  What fuel milage are you getting with your modified 8V71 Turbo?

--Geoff

[Geoff]

Bump

[TomC]

Geoff- I wish this was an apples to apples comparison (if I also had a GM transit like yours).  But-I still have the big bump above the windshield for the destination sign that grabs a lot of air and my bus is a lot more boxy then yours.  Also I have 4.56 ratio compared to your 4.1 ratio.  Even so-I get 5-6.5mpg.  When I turbo'd my engine, I did not change the pistons or liners (turbo liners have shorter intake ports and different valve timing to allow slightly longer power stroke before the exhaust valves open).  If I had, my mileage would probably be on par with yours. Ask Don Fairchild what his opinion on the 6V-92TA vs the 8V-71TA would be.  Nice to here you back on the board.  Good Luck, TomC

[uncle ned]

I like Gene Russell's Brigadier GMC.  It had 6 cylinders on each side. also had 2 turbos.

uncle ned

[TomC]

If I were rich, I would love to have a twin turbo 12V-71TTA in my truck.  There is nothing like the sound of the 12 cylinder Detroit. Paying the fuel bill would be astronomical (would get in the 4mpg range).  Good Luck, TomC