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Author Topic: 8v71 power  (Read 3720 times)
Ericbsc
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« Reply #15 on: March 02, 2011, 12:08:21 PM »

I have heard my 8-71 called the dragonfly several times. Fly down one hill, and drag up the next. I know this does not help but thought it very true!!
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MCI-RICK
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« Reply #16 on: March 02, 2011, 02:18:16 PM »

Jack,

My MCI has the V Drive.  It looks like a transit bus but only has a front door. No rear door. Oh, and can it do about 72mph. The paper work calls it a "Suburban Cruiser" also know as the "Classic".   No real storage space to speak of and so I've been shopping for another bus. May be picking up a 1970 GMC PD4905 with the 8V71 and V730D tranny.

Rick
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Aim high but look out below
brando4905
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« Reply #17 on: March 02, 2011, 02:32:03 PM »

Rick,

This is what I get for ASSuming! Shocked  If your MCI is a V-drive, then it probably will go right in the 4905.
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1980 GMC H8H-649  8V71/V730 Marion,NC

"The highway is for gamblers, better use your sense" -Dylan
MCI-RICK
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« Reply #18 on: March 02, 2011, 02:49:58 PM »

brando,

No problem here Smiley.  I want to explore all possibilities before I jump in.  Don't want to explain to the boss (wife) why I need a third bus lol Smiley

Rick
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JackConrad
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73' MC-8 8V71/HT740 Southwest Florida


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« Reply #19 on: March 02, 2011, 04:44:56 PM »

Jack,
My MCI has the V Drive.  It looks like a transit bus but only has a front door. No rear door. Oh, and can it do about 72mph. The paper work calls it a "Suburban Cruiser" also know as the "Classic".   No real storage space to speak of and so I've been shopping for another bus. May be picking up a 1970 GMC PD4905 with the 8V71 and V730D tranny.
Rick


OK, I learned something new today.  Thanks for the information.  Jack
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Growing Older Is Mandatory, Growing Up Is Optional
Arcadia, Florida, When we are home
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TomC
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« Reply #20 on: March 02, 2011, 05:09:31 PM »

After turbocharging my 8V-71 with air to air intercooler, now pulling a hill at any altitude, usually clear exhaust and no power reduction.  When over 8,000ft, will get a bit of smoke, but hardly worth mentioning.  The 71 series is much stronger then the 92 series.  71 series is less prone to head cracking, won't leak because of dry cylinder linings, and with 80 injectors will put out 400hp and 1200lb/ft torque-more then a 6V-92TA will be able to stay together putting out.  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
Barn Owl
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PD4106-1063 "Wheezy Bus"




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« Reply #21 on: March 02, 2011, 08:30:41 PM »

These are not right or wrong answers, but good, better, best situations. It all boils down to money, the more of it you have the better you can have. If you have the funds, build the 8v71 turbo like TomC did, if not go the other way. Regardless of how much more durable the 8v71 is, we are putting our engines in bus conversions, and they see far fewer miles compared to what they were designed for. If the 92 series holds up well enough in transit service then it would hold up more than just fine for my application. BTW, for V drive owners I don't think 400hp would be a good thing.
« Last Edit: March 03, 2011, 07:49:36 AM by Barn Owl » Logged

L. Christley - W3EYE Amateur Extra
Blue Ridge Mountains, S.W. Virginia
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RJ
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« Reply #22 on: March 02, 2011, 09:03:02 PM »

Rick -

The powertrain out of your MCI muzzle-loader will work fine in a 4905.

The difference will be 102" vs 96" width, so you'll have to swap cradles.  Some other adjustments will also have to be made, like radiator fan shroud spacing, etc.

I'd use the MCI radiator if it's bigger (thicker) than the one in the '05 and you can shoehorn it in.

Is the MCI's 6V a DDEC?  If so, you'll need all the associated wiring for it and the ATEC transmission.

If it's not a DDEC/ATEC combo, then you can easily "hot rod" the 6V to 350 hp, which will be sweet in the 4905.

Would it be worth it?  Tough call.  Do you know the history on both powertrains?  Based on history, you can make the call, as it's a relatively easy swap, compared to some of the others busnuts have done.

FWIW & HTH. . .

 Wink

 
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RJ Long
PD4106-2784 No More
Fresno CA
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