Author Topic: 6-71/6V71 6-92/6V92 Detroit Diesel Engines  (Read 13759 times)

Offline Rifleman

  • Newbie
  • *
  • Posts: 7
6-71/6V71 6-92/6V92 Detroit Diesel Engines
« on: March 04, 2019, 07:09:45 AM »
  I have been reading about Buses with 6-71 and 6V71 Detroit Diesel Engines and how they could be converted to having 6-92 and 6V92 Detroit Diesel Engines. As the 92 Series Detroit Diesel Engines are basically from what I can understand really just a bored out 71 Series Detroit Diesel Engines, unless I have been mistaken in my reading and research. I think that being able to convert a 71 Series Detroit Diesel Engine to a 92 Series Detroit Diesel Engine would be great. Having increased cubic inches 6-71/6V71 = 426cuin 6-92/6V92 = 552cuin of displacement would not only increase the power H.P./Torque ratings but also the effectiveness of a Jake Brake if I chose to install one. Thanks in advance for any and all thoughts, opinions, or answers. I would really like input from people who have worked on or rebuilt one.

Regards,
               Rifleman

Offline luvrbus

  • Hero Member
  • *****
  • Posts: 26525
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #1 on: March 04, 2019, 07:53:03 AM »
  I have been reading about Buses with 6-71 and 6V71 Detroit Diesel Engines and how they could be converted to having 6-92 and 6V92 Detroit Diesel Engines. As the 92 Series Detroit Diesel Engines are basically from what I can understand really just a bored out 71 Series Detroit Diesel Engines, unless I have been mistaken in my reading and research. I think that being able to convert a 71 Series Detroit Diesel Engine to a 92 Series Detroit Diesel Engine would be great. Having increased cubic inches 6-71/6V71 = 426cuin 6-92/6V92 = 552cuin of displacement would not only increase the power H.P./Torque ratings but also the effectiveness of a Jake Brake if I chose to install one. Thanks in advance for any and all thoughts, opinions, or answers. I would really like input from people who have worked on or rebuilt one.

That is not really true 92's have a totally different liner it not the same size on the top as the bottom

Regards,
               Rifleman
Life is short drink the good wine first

Offline Rifleman

  • Newbie
  • *
  • Posts: 7
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #2 on: March 04, 2019, 08:04:50 AM »
     Thanks for your input luvrbus. Unfortunately I didn't think it would be that easy, as much as I want it to be. Would it even be possible to do something like this? Or are the dry liners and wet liners that different? I know that the heads are very different.

Regards,
             Rifleman

Offline lostagain

  • Hero Member
  • *****
  • Posts: 3035
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #3 on: March 04, 2019, 08:19:09 AM »
No. 71 series has dry liners, 92 has wet liners. There are other differences too. Easiest would be to swap a 6V92TA in place of a 6V71. Same size, same motor mounts. You would have to fab the exhaust and intake piping.

JC
JC
Blackie AB
1977 MC5C, 6V92/HT740 (sold)
2007 Country Coach Magna, Cummins ISX (sold)

Offline Rifleman

  • Newbie
  • *
  • Posts: 7
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #4 on: March 04, 2019, 08:39:31 AM »
     Thanks JC, here's what I was wanting to do. I was wanting to take a 4V71 and bore it out to accept 92 Series Pistons to essentially make a 4V92 for a more heavy duty pickup truck.

Best Regards,
                    Rifleman

Offline DoubleEagle

  • Hero Member
  • *****
  • Posts: 1902
  • BCM Subscriber
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #5 on: March 04, 2019, 09:12:01 AM »
I think you are visualizing a cast block like in gas engines that can be bored out to increase cubic inches. That will not work in this situation. Some people have put Series 53 Detroit Diesels in pickups, but that is about all that is possible. If you want diesel power in a pickup, get a Ford with a Powerstroke 7.3L. If you want troubles, get the 6.0L, or newer ones. Then there are Cummins engines in the Ram pickups, and the Duramax diesels in the GM's. In all cases, the older versions are better for dependability.
Walter
Dayton, Ohio
1975 Silvereagle Model 05, 8V71, 4 speed Spicer
1982 Eagle Model 10, 6V92, 5 speed Spicer
1984 Eagle Model 10, 6V92 w/Jacobs, Allison HT740
1994 Eagle Model 15-45, Series 60 w/Jacobs, HT746

Offline chessie4905

  • Hero Member
  • *****
  • Posts: 7149
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #6 on: March 04, 2019, 09:13:55 AM »
They weren't made to be bored out. The bore stays essentially the same and have oversize liners available to deal with block wear, but they aren't much oversize. I would imagine you would get into the head bolt holes at the very least trying to overbore, along with other issues. You could turbo that engine for increased power, but it will never hold a candle to a Duramax, Cummins, or Power stroke, no matter how much you hop it up and keep it reliable. Plus the noise in the vehicle from that engine and the weight and height of it. Maybe you can hook up with an owner of one on You tube and pick their brain.
GMC h8h 649#028 (4905)
Pennsylvania-central

Offline chessie4905

  • Hero Member
  • *****
  • Posts: 7149
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #7 on: March 04, 2019, 09:23:17 AM »
Here's a little reading on the engines. Forget the high horsepower numbers though. Boats can run those hp numbers because they have the whole ocean to cool the engines.
GMC h8h 649#028 (4905)
Pennsylvania-central

Offline CrabbyMilton

  • Hero Member
  • *****
  • Posts: 2139
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #8 on: March 04, 2019, 09:43:08 AM »
Too bad they never built a 6-92.
That would have been a power upgrade to the 6-71 and pretty much fit in the same powertrain setup.

Offline Geoff

  • Hero Member
  • *****
  • Posts: 1932
    • Geoff & Sherry's RTS Conversion Pics
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #9 on: March 04, 2019, 10:49:21 AM »
Rifleman, what engine are you running now? 
Geoff
'82 RTS AZ

Offline chessie4905

  • Hero Member
  • *****
  • Posts: 7149
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #10 on: March 04, 2019, 11:31:24 AM »
CM how about using a 6-110? I wonder if the angle drive in a 4104 would handle a 6v-92?
GMC h8h 649#028 (4905)
Pennsylvania-central

Offline Rifleman

  • Newbie
  • *
  • Posts: 7
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #11 on: March 04, 2019, 12:49:17 PM »
     Hello CrabbyMilton, someone please correct me if I'm wrong or mistaken but at one point or another didn't they make a 6-92 or at least a 6V92 Detroit Diesel?

Offline CrabbyMilton

  • Hero Member
  • *****
  • Posts: 2139
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #12 on: March 04, 2019, 01:00:40 PM »
They built the 6V-92 for many years and that was the standard engine in most transit and over the road buses from about the early 80's until they phased them out by the late '90's. These were also the standard engines in fire apparatus much of that time frame as well. The 6V-92 pretty much replaced the 8V-71 and the 8V-92 was offered for those that wanted more HP in over the road buses and fire trucks.
The 6V-92 was a V6 as was the 6V-71. The 6-71 was a straight 6 and I don't believe there ever was a straight 6 version of the 92 series. The

Offline Rifleman

  • Newbie
  • *
  • Posts: 7
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #13 on: March 04, 2019, 01:51:15 PM »
     In my time reading and researching I may have been misled or led astray from different sources like this [ thedieselpageforums.com

wyodetroit

 aluminum Detroit V653T twin turbo- supercharged

1988 Chevy 4x4 1 ton truck with Detroit V653T twin turbo- supercharged aluminum block engine and Allison automatic trans. Engine starts and runs perfect. Has twin 5.9 cummins turbos along with stock supercharger. Very fast, pleanty of power, Very light engine, block is aluminum. Injectors were 170s, from diesel doug world record Detroit 6V53t drag car racer, but truck was too way fast, replaced with 90s. Massive torque, turbos match engine perfect and spool up fast and responsive. Transmission is 654 Allison and transfer case is out of light & power truck. Set up right. Truck has so much torque just driving easy it barks tires in all gears, even when it goes into lockup at 65 mph.
here is link..

http://denver.craigslist.org/cto/4673103375.html

The Good---- rare aluminum block 6V53T Detroit, runs perfect, cheap to work on entire fuel system can be replaced for 400 bucks, injectors on ebay are only 50 bucks. less than 1200 bucks rebuilds entire engine. Solid truck and solid engine and trans. 100% rust free Wyoming truck NO RUST.

The bad --- needs new carpet, paint job is fading in a few places, radio does not work, rear tires hold air, but rubber is thin..

truck is for sale locally, reserve right to end auction early.. Just this rare engine alone as core you can pay 5k, only want 8k for all of truck, and engine does not need rebuilt.

If you need help shipping , I can help as long as truck is paid for 1st. truck is located at 82301 zip code..

Detroit V653T aluminum block engine facts

Detroit V653T alumuim block engine only 1200 lbs instead of 1900 lbs cast iron block ^v53 engine.

V653T alumuim block Has 4 bolt main craddle all the way down unlike standard cast Iron block.

V653T alumuim block has Higher compression 21:1 proformace with turbo, not 17:1 like non turbo standard cast iron block engines. higher compression starts easier in cold weather.

V653T alumuim block Stock dyno 330hp 800 ft lbs torque with N70 injectors.

HP can be bumped up to

400hp with n90 injectors

650 hp with N 160 injectors

with nitros can go to 950 hp and still be a daily driver.

OIl pressure is high volume oil pump 90 psi unlike standard cast iron 6v53 engines.

more water jackets around sleeves lower down for better and faster cooling.

even though block is alluim block it has brass inserts so it still has full integretiy and strenght.

Twin turbos off of 5.9 cummins 12 valve diesel.

larger oil pan , with special sump so oil pressure even at masive inclines.

extra water ports in block in lower part of block for exstreme cooling.

But has smae irom pistons and sleves as iron block engine.

Iron heads.

Bell houseing is SAE 3#, but can be changed if needed.

because it is alluim block, it only weighs 1200# lbs instead of 1800 lbs#

stock RPMS

no load 3000 rpms

with load 2800 rpms

detroit diesel had fire ring head gaskets before it was cool.

Detroit also had the first roller cam stock that all newer gas engines now have.

wwII won.

Also will run any fuel, diesel , keresene, waste oil, gasoline oil mix, if it burns engine can be made to run on it.
] as well as this [ Gone Fishen
The 71 is a dry liner engine. Can be bored to 0.010,0.020, 0.030. Hp went from 265 to 400 hp depending on how much fuel you wanted to put in. The 'n' engine was the best configeration. Problems arose when someone decided to put a turbocharger on them. Went down hill from there. Then came the 92 series. Early engines had the same problems as the old 71. Slobber tubes leaking, excessive idling, cracked liners ect. The 92 series came out turbocharged from the get go. They did make an 'n' configeration but I only saw them in industrial applications. Then came the 'silver' engine. Blocks were beefed up, water pumps were better, cooling was better, hp went to 475 with 'normal injectors. I did a few with 9225 injectors. 9290 was the norm, 90mm output. 9225 was a 125mm output injector. The early 92 series had head problems but then they corrected that. The new style had a different part# on the head casting and a 'dog-bone' mark on the casting also. The 92 could take 220* for a short while.
Now the next thing heard here. The 71 and 92 are the same size. Blocks,flywheel housings,heads,blowers,turbo's injectors ect ect. The difference is 3/4 inch longer for the 92 motor mounts. THAT IS ALL. Oh ya the hp is different but everything can be interchanged. However do not try to mix the heads, cooling passages and valves are different configeration. Yes they can be bolted on each other. It won't work but they can be bolted on each. Nest came the new improved cylinder kits. They all were a 2 piece design and had a 'rubber' seal between the piston skirt and piston dome. This was a much better design because the old models had a metal sealring. A lot less oil dripping. The blowers can be intermixed between them, turbo's also, injectors are the same size, fuel lines, NOT the valve bridges, jakes were a 71/92 configeration, same thing. same setting. Anything I have forgotten? Oh ya, DO NOT let any contamination get into the 92 oil pan like diesel or coolant. The main bearings will spin and ruin the crankshaft/block. The 71 seeries will take it but the 92 will not. Interesting enough is that the 71 and the 92 crankshaft bores in the block are the same except for 0.0005 difference. 92 is that much larger due to main bearing torque of 50ft# more. The bearings can be mixed up but DON"T Do IT. They are different. DDA is trying to get out of the 2 cycle business, has been for years. You will find out in todays market that parts are scarce. They are not making them anymore and someone else is. We have 2 92 series in shop now and the waiting list for parts for us is 2 months for parts. Forget the 71 parts, go find parts in the wrecking yards. Cannot get a used/new 8v-71 head for love or money. Now did I forget anything???????? Oh ya, 92 series went to 500 hp with electronic's. Did see a few 515 hp in motor homes.
] according to Gone Fish the 71 Series Detroit and the 92 Series Detroit are more similar than I had originally thought, and if by simply upping the injector and turbo size like wyodetroit did to a 53 Series then a 6V92 or a converted 4V71 to 4V92 should blow the doors off modern diesel pickups. For just a hair more engine weight than a 5.9/6.7 Cummins. Also may just be wishful thinking on my part.

Rifleman

Offline DoubleEagle

  • Hero Member
  • *****
  • Posts: 1902
  • BCM Subscriber
Re: 6-71/6V71 6-92/6V92 Detroit Diesel Engines
« Reply #14 on: March 04, 2019, 03:43:31 PM »
Another case of you can't believe everything you see on the internet. Check several sources before you get your hopes up.
Walter
Dayton, Ohio
1975 Silvereagle Model 05, 8V71, 4 speed Spicer
1982 Eagle Model 10, 6V92, 5 speed Spicer
1984 Eagle Model 10, 6V92 w/Jacobs, Allison HT740
1994 Eagle Model 15-45, Series 60 w/Jacobs, HT746

 

SimplePortal 2.3.7 © 2008-2025, SimplePortal