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[GMCnet] 6.2 v. 6.5 GM Diesel [message #82388]

Thu, 29 April 2010 05:45

David L Greenberg

Messages: 899
Registered: January 2004
Location: Port St Lucie, FL

Karma: 0

Senior Member

Does anyone know how to tell the physical difference, if any? An owner
isn't sure which is installed in a coach he bought. The prior owner was
Frank Emshoff in case someone is familiar with the installation.

David Lee Greenberg
Port St Lucie, FL skype: david.lee.greenberg
Dedicated to the Preservation of the Classic GMC Motorhome
http://GMCmhRegistry.com
http://www.picturetrail.com/gmcregistry
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Re: [GMCnet] 6.2 v. 6.5 GM Diesel [message #82390 is a reply to message #82388]

Thu, 29 April 2010 06:08

k2gkk

Messages: 4452
Registered: November 2009

Karma: -8

Senior Member

Not sure, but think the 6.2 was naturally aspirated
and he 6.5 might have been turbo-charged. The 6.2
was known for being pretty anemic in performance.

* Mac Macdonald *
* Oklahoma City *
** "Money Pit" **
* '76 ex - P.B. *

> To: gmclist@temp.gmcnet.org
> Date: Thu, 29 Apr 2010 06:45:57 -0400
> From: davegreenberg1@juno.com
> Subject: [GMCnet] 6.2 v. 6.5 GM Diesel
>
> Does anyone know how to tell the physical difference, if any? An owner
> isn't sure which is installed in a coach he bought. The prior owner was
> Frank Emshoff in case someone is familiar with the installation.
>
> David Lee Greenberg
> Port St Lucie, FL skype: david.lee.greenberg
> Dedicated to the Preservation of the Classic GMC Motorhome
> http://GMCmhRegistry.com
> http://www.picturetrail.com/gmcregistry
> ____________________________________________________________
_______________________________________________
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Re: [GMCnet] 6.2 v. 6.5 GM Diesel [message #82397 is a reply to message #82388]

Thu, 29 April 2010 07:19

Oldngray

Messages: 544
Registered: August 2009
Location: Punta Gorda Florida

Karma: 0

Senior Member

The 6.2 was Non Turbo, also used a Mechanical Injection pump DB2.
If his is Non Turbo and has a Mechanical pump then it most likely is a 6.2. However, (dontcha love it) some early 6.5's were also non Turbo but I believe they had the Electric Injection pump DB4.

What would be interesting to know is, what Tranny is installed.

Richard MacDonald Punta Gorda, Florida Sold our TZE April 2015

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Re: [GMCnet] 6.2 v. 6.5 GM Diesel [message #82402 is a reply to message #82388]

Thu, 29 April 2010 09:11

olddog

Messages: 25
Registered: March 2005
Location: Gravette AR

Karma: 0

Junior Member

No Message Body

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Re: [GMCnet] 6.2 v. 6.5 GM Diesel [message #82429 is a reply to message #82388]

Thu, 29 April 2010 12:07

mike miller

Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon

Karma: 0

Senior Member

David L Greenberg wrote on Thu, 29 April 2010 03:45

A place to start:
<http://en.wikipedia.org/wiki/Detroit_Diesel_V8_engine>
<http://www.forgottendiesels.com/gm_diesel.html>

Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo' http://m000035.blogspot.com

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Re: [GMCnet] 6.2 v. 6.5 GM Diesel [message #82441 is a reply to message #82397]

Thu, 29 April 2010 12:32

Gary Berry

Messages: 1002
Registered: May 2005

Karma: -1

Senior Member

Found this on the DieselPageForums.com. Looks like the 425
transmission should hook right up. Of course there is always the axle
problem...

"6.2/6.5 Diesel Conversions - The High Points

By Jim Bigley

A few key points to remember:

1. The GM 6.2L and 6.5L diesel engines share the very same
bellhousing configuration and bolt pattern with all Chevy and GMC V-8
gasoline engines.
2. The GM 6.2L and 6.5L diesel engines share the very same motor
mount configuration with all Chevy and GMC V-8 gasoline engines.
3. The GM 6.2L and 6.5L diesel engines are about 200 or so lbs
heavier than a gasoline 350 V-8. The bare longblock weighs just over
700 lbs.
4. The GM 6.2L and 6.5L diesel engines are dimensionally identical,
and nearly every bolt-on component on either engine will interchange
with the other.
5. A conversion from gas to diesel will require a hydraulic brake
booster, diesel starter, larger diesel radiator, all engine driven
accessory brackets, and fan assemblies. Your A/C compressor and power
steering pump might work with the correct diesel brackets.
6. The automatic transmission torque converter should be changed to
one rated for diesel operation. The stall rpm of a gas converter will
be above the 1700-2000 rpm torque peak of the diesel. We suggest
modifying the transmission governor setting to upshift at an rpm below
the engine's governed rpm of 3300-3600 (if non-electronic
transmission). An overdrive transmission is recommended. Low gearing,
no overdrive and higher freeway speeds make the diesel engine hard to
live with. Best fuel economy is possible when running the engine at
about 1800-2000 rpm at your chosen cruise speed."

--
Gary and Diana Berry
73 CL Stretch in Wa.
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Re: [GMCnet] 6.2 v. 6.5 GM Diesel [message #82448 is a reply to message #82388]

Thu, 29 April 2010 13:31

Oldngray

Messages: 544
Registered: August 2009
Location: Punta Gorda Florida

Karma: 0

Senior Member

Nice to know thanks, I have a complete 6.5L which might just be installed if/when I needed to replace the "new" 455 presently installed.

Richard MacDonald Punta Gorda, Florida Sold our TZE April 2015

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Re: [GMCnet] 6.2 v. 6.5 GM Diesel [message #82450 is a reply to message #82388]

Thu, 29 April 2010 13:49

David L Greenberg

Messages: 899
Registered: January 2004
Location: Port St Lucie, FL

Karma: 0

Senior Member

Thanks Gary-I sent it on. Good info for a newbie.

On Thu, 29 Apr 2010 10:32:17 -0700 Gary Berry <duallycc@gmail.com>
writes:
> Found this on the DieselPageForums.com. Looks like the 425
> transmission should hook right up. Of course there is always the
> axle
> problem...
>
> "6.2/6.5 Diesel Conversions - The High Points
>
> By Jim Bigley
>
> A few key points to remember:
>
> 1. The GM 6.2L and 6.5L diesel engines share the very same
> bellhousing configuration and bolt pattern with all Chevy and GMC
> V-8
> gasoline engines.
> 2. The GM 6.2L and 6.5L diesel engines share the very same motor
> mount configuration with all Chevy and GMC V-8 gasoline engines.
> 3. The GM 6.2L and 6.5L diesel engines are about 200 or so lbs
> heavier than a gasoline 350 V-8. The bare longblock weighs just
> over
> 700 lbs.
> 4. The GM 6.2L and 6.5L diesel engines are dimensionally
> identical,
> and nearly every bolt-on component on either engine will
> interchange
> with the other.
> 5. A conversion from gas to diesel will require a hydraulic
> brake
> booster, diesel starter, larger diesel radiator, all engine driven
> accessory brackets, and fan assemblies. Your A/C compressor and
> power
> steering pump might work with the correct diesel brackets.
> 6. The automatic transmission torque converter should be changed
> to
> one rated for diesel operation. The stall rpm of a gas converter
> will
> be above the 1700-2000 rpm torque peak of the diesel. We suggest
> modifying the transmission governor setting to upshift at an rpm
> below
> the engine's governed rpm of 3300-3600 (if non-electronic
> transmission). An overdrive transmission is recommended. Low
> gearing,
> no overdrive and higher freeway speeds make the diesel engine hard
> to
> live with. Best fuel economy is possible when running the engine at
> about 1800-2000 rpm at your chosen cruise speed."
>
> --
> Gary and Diana Berry
> 73 CL Stretch in Wa.
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>

David Lee Greenberg
Port St Lucie, FL skype: david.lee.greenberg
Dedicated to the Preservation of the Classic GMC Motorhome
http://GMCmhRegistry.com
http://www.picturetrail.com/gmcregistry
____________________________________________________________
Penny Stock Jumping 2000%
Sign up to the #1 voted penny stock newsletter for free today!
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Dave Greenberg
Dedicated to the Preservation of the GMC Clasic
http:GMCmhRegistry.com davegreenberg1@juno.com

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Re: [GMCnet] 6.2 v. 6.5 GM Diesel [message #82492 is a reply to message #82388]

Thu, 29 April 2010 19:26

David L Greenberg

Messages: 899
Registered: January 2004
Location: Port St Lucie, FL

Karma: 0

Senior Member

On Thu, 29 Apr 2010 13:41:51 -0500 Richard MacDonald <rm1936@gmail.com>
writes:
>
>
> David, it would also be nice to know what kind of mileage he gets
> with that engine. The box may well be the "brain" for the fuel
> injection if it is the electronic Pump and it would have a PMD (pump
> mounted device) which controls the metering as well as EGR, O2 and
> EGT sensors.
>
>
> --
> Richard MacDonald
> Punta Gorda, Florida
> 76 Edgemonte
> 94 K2500 6.5 Turbo Diesel Silverado
>

I asked and will report his reply.

David Lee Greenberg
Port St Lucie, FL skype: david.lee.greenberg
Dedicated to the Preservation of the Classic GMC Motorhome
http://GMCmhRegistry.com
http://www.picturetrail.com/gmcregistry
____________________________________________________________
Penny Stock Jumping 2000%
Sign up to the #1 voted penny stock newsletter for free today!
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Dave Greenberg
Dedicated to the Preservation of the GMC Clasic
http:GMCmhRegistry.com davegreenberg1@juno.com

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Re: [GMCnet] 6.2 v. 6.5 GM Diesel [message #82500 is a reply to message #82492]

Thu, 29 April 2010 21:01

hal kading

Messages: 642
Registered: February 2004
Location: Las Cruces NM

Karma: 4

Senior Member

The transmission will not bolt up to the Olds 403, 455 or Cad 500 engines. It will bolt up to Chev and GMC V-8 engines.

"Found this on the DieselPageForums.com. Looks like the 425
transmission should hook right up. Of course there is always the axle problem..."

" 1. The GM 6.2L and 6.5L diesel engines share the very same
bellhousing configuration and bolt pattern with all Chevy and GMC V-8 gasoline engines."

Hal Kading who is all too familiar with Chevy and 425 bolt patterns. Las Cruces NM

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