Home » Public Forums » GMCnet » [GMCnet] What happens inside a motor run too lean!
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| Re: [GMCnet] What happens inside a motor run too lean! [message #337296 is a reply to message #337292] |
Thu, 27 September 2018 11:04   |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Think in terms of an oxy/acetelyne cutting torch. Nothing too much exciting
happens when you heat parts with the preheat flames, but "Ohhh Mama" when
you push on the oxygen lever, bad stuff happens quick. Rapid oxidation
occurs within nano seconds when excessive oxygen is present.
Parts can, and do, glow red hot in the absence of oxygen, like exhaust
valves in a running engine, turbocharger wheels and cases, exhaust
manifolds and headers, etc. and no harm comes to them short term. BUT, add
too much oxygen to the exhaust gas stream and look out, bad stuff happens
in the form of damaged pistons, exhaust valves, turbo wheels, uncontrolled
combustion processes which results in detonation, overheating, cracked
castings, broken crankshafts etc. Quicker than you can describe it.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Thu, Sep 27, 2018 at 7:40 AM Carl Stouffer wrote:
> Here are a couple of photos of pistons that came out of Dave Wood's 403:
>
> http://www.gmcmhphotos.com/photos/g7162-david-wood-27s-403.html
>
> It had a heater hose come in contact with the AC belt on the way to the
> Tucson GMCMI last Spring and was severely overheated besides running lean
> due
> to the mysterious vacuum leaking device that had been installed in the PCV
> line.
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
> Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive,
> Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American
> Eagles,
> Solar battery charging. GMCSJ and GMCMI member
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] What happens inside a motor run too lean! [message #337319 is a reply to message #337296] |
Fri, 28 September 2018 08:56 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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OK so what is 'too lean' 16:1? 15:1? 14:1?
________________________________
From: Gmclist on behalf of James Hupy
Sent: Thursday, September 27, 2018 11:04 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] What happens inside a motor run too lean!
Think in terms of an oxy/acetelyne cutting torch. Nothing too much exciting
happens when you heat parts with the preheat flames, but "Ohhh Mama" when
you push on the oxygen lever, bad stuff happens quick. Rapid oxidation
occurs within nano seconds when excessive oxygen is present.
Parts can, and do, glow red hot in the absence of oxygen, like exhaust
valves in a running engine, turbocharger wheels and cases, exhaust
manifolds and headers, etc. and no harm comes to them short term. BUT, add
too much oxygen to the exhaust gas stream and look out, bad stuff happens
in the form of damaged pistons, exhaust valves, turbo wheels, uncontrolled
combustion processes which results in detonation, overheating, cracked
castings, broken crankshafts etc. Quicker than you can describe it.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Thu, Sep 27, 2018 at 7:40 AM Carl Stouffer wrote:
> Here are a couple of photos of pistons that came out of Dave Wood's 403:
>
> http://www.gmcmhphotos.com/photos/g7162-david-wood-27s-403.html
>
> It had a heater hose come in contact with the AC belt on the way to the
> Tucson GMCMI last Spring and was severely overheated besides running lean
> due
> to the mysterious vacuum leaking device that had been installed in the PCV
> line.
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
> Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive,
> Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American
> Eagles,
> Solar battery charging. GMCSJ and GMCMI member
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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