What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

What are everyone's past and/or present with the 6.2 and 6.5 Detriot Diesel Engines?

Not a Detroit Diesel engine.

Not a lot of power.

Smog era gas burners didn't have much power either.

They do have decent economy numbers.

Martin
 
guess I've driven too many hotrods in my days.... the 2 I drove made my 4.3 feel decent.. couldn't get out of there own way on an on -ramp...
 
Timing, pump and injector condition play a huge part in power, especially na. I have had some that would barely pull OD on flat ground, but put in a good fuel system with pump turned up right to the edge of smoky, and they run pretty good.
 
these where semi-tired stockers, of unknown condition.... not mine....

I could see doing a 6.5 up if prices go back up to the $4, $5 range.. but at these gas prices, it's laughable to be looking for that extra 5, 6 mpg IMO..

tho I can appreciate someone driving one just for their love of square bodies.. as opposed to knuckling under and doing an econo-box, etc, which can also be understandable at $4+ a gallon..... delegating the square to "fun" duty..

even I picked up the 4.3 rig, as an alternative to the 9 mpg Mutt..... tho it does tend to sit for weeks on end! :doah::haha:
 
ryoken said:
tho I can appreciate someone driving one just for their love of square bodies.. as opposed to knuckling under and doing an econo-box, etc, which can also be understandable at $4+ a gallon..... delegating the square to "fun" duty..
Click to expand...

That's what I did. Some days I get 40MPG. Some days I get 20. Kinda depend on the mood. :haha:

Having another vehicle option makes it easier to keep the trucks away from the winter salt, too. There were a couple of winters that I had nothing else to drive... :dunno:
 
I might just go ahead and second suburban that is a diesel and keep my gas one.

That way when fuel prices goes up I'll have the diesel on stand by
 
I have one of each. It just worked out that way, not anything I was thinking of. My 6.2 has 280k+, I'll run it till it drops. I do want to turbo it real bad but I just can't see forking out the $$ for the kit. Used ones are gone before I can get to them. I'm just glad I live in a flat part of the country. :whistle:
 
Big Ray said:
I have one of each. It just worked out that way, not anything I was thinking of. My 6.2 has 280k+, I'll run it till it drops. I do want to turbo it real bad but I just can't see forking out the $$ for the kit. Used ones are gone before I can get to them. I'm just glad I live in a flat part of the country. :whistle:
Click to expand...

That's a bunch of miles. I wouldn't go to the effort of boosting such a worn engine. Unless you are fine with hastening its end of life... :dunno:
 
blackandgold51 said:
I might just go ahead and second suburban that is a diesel and keep my gas one.

That way when fuel prices goes up I'll have the diesel on stand by
Click to expand...

Diesel fuel is usually 50+ cents a gallon more than gasoline--it was not until the past few months that I could buy diesel for almost the same cost as gas--diesel last week at my last fill up at the cheapest place locally was 2.15 a gallon--gas was 1.96...I bet once prices go back up,diesel will rise the most,and stay high the longest..

In my experience a NA 6.2 with highway gearing has about the same acceleration and torque of a 250 straight six..makes the most torque at low RPM's like a straight six...but if you hold it in the lowers gears and let it wind up a bit,instead of letting it upshift so soon with the stock govenor in the trans,they will keep up to normal speed ,unless of course your going uphill or towing..this kills off some mpg though..

"Chained Dog" is a bit much,but there has been times my pickup felt like it couldn't pull the foreskin off a mosquito...other times it feels as strong as a 454..its best performance is when your plowing with it,it likes to lumber along at low rpms and grunt..the fact it hasn't enough HP also helps the drive train live longer..
 
Were 6.5's offered in the square bodies at any time? I'm only familiar with them as the engines in Humvees. Would a 6.5 drop in, in place of a 350?
 
The 6.5's are externally the same as a 6.2 ,so one will drop in wherever a 6.2 or small block was...turbo'ed ones will need some heater box mods to fit,if it has A/C I believe though...
I do not think GM ever put 6.5's in a square body factory--the 6.2 ran up till '92 or 93,so they only went in the GMT400 bodies far as I know..
 
diesel4me said:
Diesel fuel is usually 50+ cents a gallon more than gasoline--it was not until the past few months that I could buy diesel for almost the same cost as gas--diesel last week at my last fill up at the cheapest place locally was 2.15 a gallon--gas was 1.96...I bet once prices go back up,diesel will rise the most,and stay high the longest..

In my experience a NA 6.2 with highway gearing has about the same acceleration and torque of a 250 straight six..makes the most torque at low RPM's like a straight six...but if you hold it in the lowers gears and let it wind up a bit,instead of letting it upshift so soon with the stock govenor in the trans,they will keep up to normal speed ,unless of course your going uphill or towing..this kills off some mpg though..

"Chained Dog" is a bit much,but there has been times my pickup felt like it couldn't pull the foreskin off a mosquito...other times it feels as strong as a 454..its best performance is when your plowing with it,it likes to lumber along at low rpms and grunt..the fact it hasn't enough HP also helps the drive train live longer..
Click to expand...
I don't tow as much and I don't drag race nor go fast like a maniac
 
diesel4me said:
Diesel fuel is usually 50+ cents a gallon more than gasoline--it was not until the past few months that I could buy diesel for almost the same cost as gas--diesel last week at my last fill up at the cheapest place locally was 2.15 a gallon--gas was 1.96...I bet once prices go back up,diesel will rise the most,and stay high the longest..

In my experience a NA 6.2 with highway gearing has about the same acceleration and torque of a 250 straight six..makes the most torque at low RPM's like a straight six...but if you hold it in the lowers gears and let it wind up a bit,instead of letting it upshift so soon with the stock govenor in the trans,they will keep up to normal speed ,unless of course your going uphill or towing..this kills off some mpg though..

"Chained Dog" is a bit much,but there has been times my pickup felt like it couldn't pull the foreskin off a mosquito...other times it feels as strong as a 454..its best performance is when your plowing with it,it likes to lumber along at low rpms and grunt..the fact it hasn't enough HP also helps the drive train live longer..
Click to expand...
Here in New Orleans , Louisiana diesel fuel the lowest is 2.07 a gallon. Regular at 1.60s . While Premium 2.40s a gallon or a little lower . I use regular if funds are low however when I have it I use mostly premium.
 
diesel4me said:
Diesel fuel is usually 50+ cents a gallon more than gasoline--it was not until the past few months that I could buy diesel for almost the same cost as gas--diesel last week at my last fill up at the cheapest place locally was 2.15 a gallon--gas was 1.96...I bet once prices go back up,diesel will rise the most,and stay high the longest..

In my experience a NA 6.2 with highway gearing has about the same acceleration and torque of a 250 straight six..makes the most torque at low RPM's like a straight six...but if you hold it in the lowers gears and let it wind up a bit,instead of letting it upshift so soon with the stock govenor in the trans,they will keep up to normal speed ,unless of course your going uphill or towing..this kills off some mpg though..

"Chained Dog" is a bit much,but there has been times my pickup felt like it couldn't pull the foreskin off a mosquito...other times it feels as strong as a 454..its best performance is when your plowing with it,it likes to lumber along at low rpms and grunt..the fact it hasn't enough HP also helps the drive train live longer..
Click to expand...
Not to mention when I use premium I fill it all the way up(when I have the funds) to the point where the tank cannot take anymore fuel
 
Mastiff said:
Were 6.5's offered in the square bodies at any time? I'm only familiar with them as the engines in Humvees. Would a 6.5 drop in, in place of a 350?
Click to expand...

No, they weren't offered until '92 (when the squarebodies were long gone), but the 6.5 engine is based on the 6.2 design, and they are quite compatible. The first 2 years have mechanical injection pumps (just like a 6.2), so it is a direct swap for a 6.2 engine (minus clearance issues around the turbocharger).

Swapping in place of a TBI 350 requires little modification. You probably wanna swap out the fuel filter for one that separates water, and you'll have to wire up glow plugs (most of us wire them to a push button). Stock 6.2/6.5 radiators are quite a bit larger than sbc radiators. Beyond that, stuff should swap quite nicely. If you're starting with a carb truck you will also have to install a fuel return line. If you swap in a 6.5, you'll also have to upgrade to an electric lift pump (as the fuel pump port gets repurposed due to the turbine setup). With a 6.2 you can run either electric or mechanical lift pump.

I think that's about it. It's a lot easier than most of the possible engine swaps.
 
campfire said:
No, they weren't offered until '92 (when the squarebodies were long gone), but the 6.5 engine is based on the 6.2 design, and they are quite compatible. The first 2 years have mechanical injection pumps (just like a 6.2), so it is a direct swap for a 6.2 engine (minus clearance issues around the turbocharger).

Swapping in place of a TBI 350 requires little modification. You probably wanna swap out the fuel filter for one that separates water, and you'll have to wire up glow plugs (most of us wire them to a push button). Stock 6.2/6.5 radiators are quite a bit larger than sbc radiators. Beyond that, stuff should swap quite nicely. If you're starting with a carb truck you will also have to install a fuel return line. If you swap in a 6.5, you'll also have to upgrade to an electric lift pump (as the fuel pump port gets repurposed due to the turbine setup). With a 6.2 you can run either electric or mechanical lift pump.

I think that's about it. It's a lot easier than most of the possible engine swaps.
Click to expand...

Wait, are all 6.5's turbo? For some reason I thought they were NA, like in military Humvees for example.
 
You must log in or register to reply here.

Latest Posts

Top Bottom