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Author Topic: To rebuild or replace My DD8v71?  (Read 4100 times)
RickB
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81 MCI 9 smooth side 8V71 Allison 754




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« Reply #15 on: May 19, 2010, 05:15:33 PM »

Clifford as usual thanks for separating fact from fiction.
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Ed Hackenbruch
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« Reply #16 on: May 19, 2010, 06:09:04 PM »

Brian,  "using a gallon of oil every 500 miles".   Are you trying to keep it up at the full mark?  Do you let it set for about 30 minutes after shutting down so the oil has time to get down into the pan?  I can run close to 2000 miles with the oil sitting right at the add mark or just a hair above.   If i try to keep it at the full mark i could probably also use a gallon every 500 miles or so.  You do know that these things will blow out any excess until they reach a certain level ?   My engine had 13,000 miles on it when i got the bus and now has about 50,000 miles and runs great. Took me the 1100 mile trip home with it to remember the thing about detroits and the oil level. Grin
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1968 MCI 5A with 8V71 and Allison MT644 transmission.  Western USA
Barn Owl
Roanoke, VA
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« Reply #17 on: May 19, 2010, 11:09:43 PM »

Quote
If i try to keep it at the full mark i could probably also use a gallon every 500 miles or so.  You do know that these things will blow out any excess until they reach a certain level ?

I didn't believe it until I experienced it for myself. Try running it at the lower end of your stick and see what happens.
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« Reply #18 on: May 20, 2010, 04:23:41 AM »

yep. i've tried all the easy stuff.  I run it kind of between the bottom of the stick and halfway between full and empty.  sometimes they seem to use oil because they are using oil!

Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
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« Reply #19 on: May 20, 2010, 04:34:47 AM »

mine is equally moody on oil usage (leak or consume)..found my stick was marked wrong..should have been full mark 1 inch below block....8 V92
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« Reply #20 on: May 20, 2010, 07:21:10 AM »

Brian, if you can find the 1 oil ring piston kit for your 71 that is the best to use.( 1 large ring instead of the 2 small) 
I have a 8v92T in my Eagle I run 19:1 compression with 15lbs of boost no leaks I use about 1 gal of oil every 5500 miles and average 7.5 mph plus it produces 1550 lbs of torque at the rear wheels not to shabby for a old 2 stroke running with the 60 series. 

good luck
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« Reply #21 on: May 20, 2010, 08:14:45 AM »

Clifford, again thank you for that tip.  I have a question - when rolling the engine out is it feasible to leave the gearbox (a spicer) in?  One big reason I have been leaning towards in-frame is the fuss of disconnecting the clutch and shift linkages, and getting them back together again.  they are just really hard to reach on the 5, although I can take the bed out and go through the floor.  The downside of that is constructing a frame to hold up the gearbox after it's off the engine, I suppose.  Or am I making a mountain out of a molehill?

Part of my issue is that the powerpack (engine plus gearbox) weighs more than all three of my racecars put together.  i can rebuild engines - it's the rigging it in and out that intimidates me. I'm used to crankshafts that I can pick up with one hand... Grin
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
Just Dallas
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« Reply #22 on: May 20, 2010, 08:26:44 AM »

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Just Dallas
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« Reply #23 on: May 20, 2010, 08:27:30 AM »

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« Reply #24 on: May 20, 2010, 08:28:15 AM »

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RickB
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« Reply #25 on: May 20, 2010, 09:10:49 AM »

Clifford,

By the looks of your ast post on this subject it is becoming clear to me that you have never seen the movie "Broadcast News".

"I have a 8v92T in my Eagle I run 19:1 compression with 15lbs of boost no leaks I use about 1 gal of oil every 5500 miles and average 7.5 mph plus it produces 1550 lbs of torque at the rear wheels not to shabby for a old 2 stroke running with the 60 series. "

There is a seen in that movie where the guy who has everything going for him has a discussion with the guy who doesn't have a whole lot going for him says" What do you do when your real life exceeds your dreams?" to which the albert brooks character replies: "keep it to yourself"!!!

For a guy to have no leak, 1550 lbs of torque, fresh, no smoking, running perfect, passing series 60 two stroke has to qualify as a "keep it to yourself" moment to all us underpowered, leakers running at 20mph up the Rockies slowpokes like myself.

Just kidding of course. Your motor gives us reason to dream.

Rick
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« Reply #26 on: May 20, 2010, 09:32:24 AM »

RickB, there are several of the 8v92 in the bus world that will out preform mine, Don has a good 8v92 he gets better fuel mileage than I do but I weigh a little more than he does don't count the old 2 strokes out their not ready to die just yet.Who knows Don just passed the CARB emissions in Ca with his setup EPA may not like that.   


good luck
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Van
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« Reply #27 on: May 20, 2010, 10:42:05 AM »

Rick, just imagine what Clifford can do when he figures out how to get it out of second gear Grin Grin Grin
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RickB
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« Reply #28 on: May 20, 2010, 11:56:11 AM »

Wait a second.... Are you saying there's another gear???

 Grin Grin Grin
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