Detroit 6-71T engine

[rpgdeity]

Yeah, nothing wrong with a Detroit (I hope to have a 4-53T one of these days...), but in all reality a '71 series Detroit is way too big for the 5/4 ton suspension. Plus parts plus transmission options, etc, you are really stepping into heavy duty commercial truck kinda stuff. Huge roadranger transmissions and the like.

Interesting fact, ALL the old Detroits are at least supercharged, they have to be in order to run properly since they are 2 stroke engines. Don't be fooled, the supercharger really doesn't boost the power output, its simply there to provide a constant positive pressure on the intake, otherwise the engine wouldn't run. Now the turbo versions are the Detroits you want to get because at idle the supercharger holds a little positive pressure, but then at higher RPMS the turbocharger puts out far more PSI boost than the supercharger and actually adds to overall performance. Basically at high RPMS the supercharger doesn't do anything and the turbo is doing the work for boost.

Our tender at the fire station is an old Freightliner with an 8V92T Detroit in it...talk about a big engine, 736 cubic inches. That sucker screams when it is wound up. Those engines also leak, no I should say that they slobber, lol. If a Detroit stops leaking, that means it is out of oil, lol.

[glenn]

They are getting harder to find and get parts for due to the fact that they are a dirty engine emissions wise and aren't being built anymore that I know of. I am in CA and haven't seen one in a big rig for quite a while.

[Doug]

Just the noise alone would drive me out of the cab.

Sometimes a little engine noise is cool, but a 6v71 would be more than obnoxious

[moosejr]

Yeah, nothing wrong with a Detroit (I hope to have a 4-53T one of these days...), but in all reality a '71 series Detroit is way too big for the 5/4 ton suspension. Plus parts plus transmission options, etc, you are really stepping into heavy duty commercial truck kinda stuff. Huge roadranger transmissions and the like.

Interesting fact, ALL the old Detroits are at least supercharged, they have to be in order to run properly since they are 2 stroke engines. Don't be fooled, the supercharger really doesn't boost the power output, its simply there to provide a constant positive pressure on the intake, otherwise the engine wouldn't run. Now the turbo versions are the Detroits you want to get because at idle the supercharger holds a little positive pressure, but then at higher RPMS the turbocharger puts out far more PSI boost than the supercharger and actually adds to overall performance. Basically at high RPMS the supercharger doesn't do anything and the turbo is doing the work for boost.

Our tender at the fire station is an old Freightliner with an 8V92T Detroit in it...talk about a big engine, 736 cubic inches. That sucker screams when it is wound up. Those engines also leak, no I should say that they slobber, lol. If a Detroit stops leaking, that means it is out of oil, lol.

My friend is a truck mechanic who has been wrenching on these things for years refers to the old 2-stroke detroit as "road oilers" because no matter how careful you are in assembling them, even a fresh one will leak. If you ever see one apart, it is an interesting design . ..and you can see why the supercharger is needed. . .

[5quarter]

Detroit diesel picture reference

[Hammer]

I like how they show the 6-71 as RA - Naturally aspirated!
And you clearly see the blower on the side of the block.
I do understand that it is required to run the motor, but it still isn't a N/A motor.

Too bad those photos don't put anything in them for size comparison. I know the 6-71 in my dozer is pretty darn BIG!

[Hammer]

Oh yeah, I seemed to find a lot of parts availability for my 6-71.
And that motor was made in 1947!

[foodstamp]

yea i had a 4-71 i think it was, and it was huge, never heared it run. but i did put it in the jeep, and it made it sit on the bump stops, so no doubt it was heavy lol. not to mention the motor was loong and would probably not fit at all... but still after that motor ive been looking for a 3-53 to use, and sure enough my buddie who's dad owns a farm that has about 20 or so of those motors for pumps, and ive definetly been thinking about it, but it would be super under powered.