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Old 02-13-2015, 11:57 AM   #11 (permalink)
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The 6.2L did not come from GM turbocharged.
Banks offered a turbo kit, then a few others followed.
What ever you do, don't put the banks turbo or a factory GMx on it. All the banks stuff for the 6.2 is excellent, the turbo they use is just too small.
I use a banks exhaust manifold on my suburban they are great.

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Old 02-13-2015, 11:58 AM   #12 (permalink)
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Oh man, I'd love to find a 6.2 blazer!

Reliable. Simple mechanical injection!.

Never offered with a turbo from GM - the banks unit could be factory installed when you ordered it or you could put it on later.

6.2 is simple, reasonably reliable and does get good fuel econ. They are extremely cold blooded ,though. Good luck getting one to start if it's under 30F out!
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Old 02-13-2015, 12:54 PM   #13 (permalink)
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If it’s a 82 and nobody has swapped engines (it is a thirty year old vehicle) it came as a normally aspirated 6.2. GM never turbocharged the 6.2 and voided your warranty if you did so yourself. Back then the warranties weren’t very long so by time you figured out this is an underpowered pig, your warranty had expired anyway.

The Banks conversion was far and away the most popular turbo conversion. As somebody pointed out the Banks turbo was too small. That was for a reason. By using a too-small turbo ol’ Gale avoided the expense and complication of a wastegate. Also by limiting air the thing wouldn’t become so powerful as to destroy itself. The Banks conversion was superbly engineered for that engine.

6.2s and later 6.5s were indeed used on HMMVs and CUCV military pickups.

Some say the 6.2 was the better MPG vehicle as it had smaller pre-combustion chambers that needed less fuel to work. BTW, my 6.2 was never cold natured at all. It woke up nicely on 25 below morning out on the Great Plains. I did use the later model glow plugs.

Do yourself a favor and convert it to a NV4500 manual or resign yourself to a new automatic every 40,000 miles. Wimpy as it was, the 6.2 made nearly peak torque at very low RPM and the automatic at low engine RPM will not cool itself even with an oil cooler the size of a VW Golf radiator. The manual is bulletproof and is amenable to gearing changes and GV overdrives for max MPG.

There are stories out of Detroit how GM had an engineering “Mule” Suburban with a 6.2 and 2.73 gears (never offered commercially). Sluggish as hell but allegedly got 30 MPG real world. Salt that to taste.

Here’s your gold mine of information of 6.2s and 6.5s although the site has morphed into a Duramax site sinc e the Duramax (an Isuzu design built in a Dayton suburb under license) supplanted the 6.5.

The Diesel Page - for the 6.2L, 6.5L, and Duramax 6600 (6.6L) GM Chevrolet and GMC diesel engines.
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Old 02-13-2015, 01:29 PM   #14 (permalink)
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I've heard of 2WD 1/2 ton 6.2 suburbans getting 25MPG with factory overdrive autos.
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Old 02-13-2015, 02:34 PM   #15 (permalink)
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Quote:
Originally Posted by Miller88 View Post
6.2 is simple, reasonably reliable and does get good fuel econ. They are extremely cold blooded ,though. Good luck getting one to start if it's under 30F out!
If your starter and glow plugs are good a pair of 1200cc batteries will start it right up in -40 F weather without an issue.

My 6.2 was the only vehicle that could start at college when it was -41F outside, I jumped at least 5 people that day.

Key is, if it can crank long enough it will eventually start but you wear out starters fast.
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Old 02-14-2015, 05:56 PM   #16 (permalink)
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A deposit was stuck on this on the 13th.

unfortunately it was not I.

Many thanks for the gen though people- very informative

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