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Old 03-07-2012, 02:54 PM   #15
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The 6.2 was designed from the ground up as a diesel. It is NOT a converted gas engine as many claim. Only the Olds 350 based GM 5.7 diesel was such and while it was pretty much a total FAIL, it is a complement to the Olds gas engine design that it worked as a diesel at all.

When GM had Detroit Diesel design the 6.2, it was never intended for serious, heavy duty use like a motorhome. GM wanted a fuel efficient alternative to their small block gas engines that could be used in a 1/2 ton chassis which means the design had to be fairly lightweight (notice that Ford and Dodge never put their diesels in a 1/2 ton truck). Detroit gave GM what they asked for. In a 1/2 ton pickup or Suburban with the overdrive transmission, the 6.2 would give 22-24 mpg on the highway - WAY better than the carbureted gas motors of that era.

I like the 6.2 engine BUT only in its intended application. Put that 6.2 in a 12,000 lbs. motorhome and it is about all it can do to get the wheels turning.
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Old 03-07-2012, 06:08 PM   #16
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I've accepted the fact that the 6.2 is a gutless turd, but I'm more concerned with fuel burn. If it will do highway speed and do better than 8mpg, I'm happy. Thing is, I'm sure the rig needs to be floored most of the time, so will it knock the end out of the motor? I've seen lots of different models from this era with this motor.

Buying an old rig like this is gonna be a crapshoot either way. You never know how it was treated. BUT, if the motor will last under normal circumstances, I might give it a shot.
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Old 03-08-2012, 01:34 AM   #17
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For what it's worth I loved my 6.2 Diesel, never had any major issues or repairs and it still ran like new when I sold it with 240,000 miles on the odo. Definately not a powerhouse but mine was very reliable. It all comes down to how they are maintained and driven. Mine was in a PU not in a MH but driven easy with a fully loaded truck camper it still got 25mpg, my hemi does around 12....... Sure I had to take hills slow but I was never in a hurry with the camper on anyway..
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Old 03-08-2012, 07:47 AM   #18
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That's an interesting fact that the 6.2 was really designed for light truck use. I wonder why GM put the thing in their RV chassis?

Regarding fuel burn, I dunno the exact comparisons between the 6.2 and 6.5, but we drove our Trek 6.5 from to Kentucky to Oregon & back, towing a 5000 lb car trailer and our overall trip mileage was just over 9 MPG. This includes climbing some long mountain grades at 20 MPH. On more level terrain, not towing, we could usually get 10 MPG. To reiterate, the big issue we had was overheating. I had an aftermarket coolant temperature gauge, with it's own sending unit, and could watch the temperature change almost like a tachometer as I changed throttle settings.

So gutwrencher, are you gonna tow anything with the 6.2 RV if you buy it?

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Originally Posted by gutwrencher View Post
I've accepted the fact that the 6.2 is a gutless turd, but I'm more concerned with fuel burn. If it will do highway speed and do better than 8mpg, I'm happy. Thing is, I'm sure the rig needs to be floored most of the time, so will it knock the end out of the motor? I've seen lots of different models from this era with this motor.

Buying an old rig like this is gonna be a crapshoot either way. You never know how it was treated. BUT, if the motor will last under normal circumstances, I might give it a shot.
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Old 03-08-2012, 02:59 PM   #19
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Quote:
Originally Posted by George Schweikle View Post
That's an interesting fact that the 6.2 was really designed for light truck use. I wonder why GM put the thing in their RV chassis?
The 6.2 & 6.5 were used extensively in the P-Series chassis for commercial use. LOTS of Postal and UPS box vans had 'em, but those still didn't carry the weight of a motorhome.

GM did a lot of stupid things like put transmissions designed for 4 cyl & V6s (THM200) behind a V8. Once an item is in their parts bin, the bean counters will decide to use it to save costs.
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Old 03-08-2012, 07:03 PM   #20
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We'd pull a 3000lb boat on short trips, but for long trips we'd be unloaded.

Gonna go take a peek at this rig Saturday, will update.
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Old 03-08-2012, 10:17 PM   #21
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I have gotten a constant 15 MPG. On 3, 200 mile trips.
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Old 03-09-2012, 07:42 PM   #22
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the 6.2 is like all gm engines if it is good it's great otherwise walk away quickly have know several people with them in pick ups one had three rebuilds in 150,000 miles the other went 300,000 plus..one plus is not really hard to work on
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Old 03-10-2012, 08:38 PM   #23
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Well, lemme tell you a story. Called the seller Thurs, let him know we would be there Sat from out of state. Called the seller Sat morning from the hotel in the nearest town, let him know we were an hour away. Seller informed me that "someone put money down on it last night, so he kinda bought it". WHAT?? Yeah, the seller gives some other guy the courtesy of moving him to the front of the line and taking a couple hundred bucks to call it sold. Bloody hell, he "kinda" bought it, I was gonna really buy it! I had a couple hundred invested in just running down there! The seller couldn't have scheduled this other guy in after me? He's asking $2500 for this rig, and some local guy (I'm assuming local, if he can't afford to buy it he can't afford long trips) jumps on it with whatever in his pocket at the time and promises the rest after a payday loan. So after 500 miles worth of fuel, one hotel bill, and one slap in the face....I'm without a rig. (I do love a good road trip)

Long story short; if anyone wants to offload some machinery around Wichita lemme know.
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Old 03-10-2012, 09:24 PM   #24
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that sounds like some sorry s*** there..
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Old 03-19-2012, 03:47 PM   #25
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I feel for you..we had the same happen to us over a 5th wheeler. Some people are just not playing nice... Dan
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Old 03-20-2012, 07:36 AM   #26
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Yeah, people are fickle......especially with a dollar in front of their nose.

On the bright side, I found another rig in better shape, less miles, and 3 years newer for the same price. It's a gas though, 454. Trade economy for power? 6.2s are a little scarce, most everything I look at is a BB Chevy.
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