It's a minor point, but apparently not commonly known, that the GM 6.2 diesel
was actually designed by Chevrolet at the GM Tech center in Warren and then
control of production and design was turned over to Detroit Diesel after
production was started. My brother-in-law's wives brother works for the GM tech
center and was involved in the design of the 6.2 diesel way back. We were
discussing the 6.2 diesel at a family gathering. (For some reason that sounds a
little strange) We also went to school together. He is now involved in the
testing of the new Duramax engine that was designed by Isuzu. Apparently that
is one strong engine.
Dave
>>>>>>>>>>>>>>>>>>
James Shanks wrote:
> I have to correct your statement Steve. The Oldsmobile 5.7 Diesel was a
> converted gas engine turned into a Diesel. The 6.2 was designed by Detroit
> Diesel for General Motors specifically to replace the 5.7 engine. It was
> designed as a normally aspirated Diesel not turboed as a turbo Diesel uses a
> different camshaft and timing. Single biggest difference between the 5.7/6.2
> is the 5.7 crankshaft weighs 85 pounds and the 6.2 weighs 200 pounds. Also a
> turbo Diesels valves overlap IE: the exhaust and intake stay open a few
> degrees so the turbo can scavenge all the burned residue from the previous
> power stroke with clean air <read oxygen> the exhaust valve closes first
> thereby pressurizing the cylinder if the turbo is working. The throttle
> would be open and the engine working to create positive boost from the turbo
> then the intake valve closes as the piston starts it's compression stroke.
> The normally designed 6.2 Diesel works like a gas engine in respect to the
> valves, only one open at a time with little or none valve overlap.
> The biggest problem with the 5.7 Diesel was it was a stopgap engine
> rushed into production by GM to compete < until the new designed from the
> ground up as a Diesel the 6.2 was ready for production > with other auto
> companies who had successful Diesels on the market. Nothing really wrong
> with the 6.2 design except when your in the hills, then you stay in the
> right lane with your four way turn signals on and thank God you have a
> diesel! If it worries you as you crawl up the hill think how much gas you'd
> use hauling the same load and smile. BEEEG GRIN!!!!
>
> James Shanks
> n1vbn@bit-net.com
>
> ----- Original Message -----
> From: Scuba Steve <me_scubasteve@yahoo.com>
> To: Military Vehicles Mailing List <mil-veh@mil-veh.org>
> Sent: Saturday, April 21, 2001 4:12 PM
> Subject: Re: [MV] M1009 Turbo
>
> > I have a 6.2 in my humvee and would never consider
> > installing a turbo. I imagine the military engines
> > are built stronger but the 6.2 is a gas engine
> > converted to diesel. They are not built strong enough
> > to handle a turbo. I have heard enough stories about
> > the 6.2 in regular vehicles not lasting.
> > You would be better off looking for a 6.5 to play
> > with. Good luck
> >
> > Steve
> > --- Gary Pavone <gpavone@thegrid.net> wrote:
> > >
> > > I took my '84 M1009 (96k miles showing) to a very
> > > reputable mechanic last
> > > week to see about having a turbo installed. He told
> > > me that he is reluctant
> > > to add a turbo to the GM 6.2 because they tend to
> > > overheat and basically
> > > can't take it. He checked the compression and said
> > > it was too low for the
> > > turbo install anyway, so he wouldn't do it. It was
> > > 320 to 360 in each
> > > cylinder and he said it should be 380 to 400. I want
> > > to turbocharge the
> > > thing because I live in a mountainous area at high
> > > elevation and the extra
> > > power would be nice. I don't tow anything huge. My
> > > question to you
> > > knowledgeable diesel heads is:
> > >
> > > Is this a load of bull or what?
> > >
> > > There is another place in town that does this
> > > modification where I could get
> > > a second opinion. The first place is very reputable,
> > > as I said. I'm just
> > > wondering if they are too conservative or what.
> > > Thanks for the help.
> > >
> > > Gary Pavone
> > > gpavone@thegrid.net
> > >
> > >
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This archive was generated by hypermail 2b29 : Tue May 01 2001 - 07:42:42 PDT