Running in under load procedure?
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Teching In
Joined: Nov 2007
Posts: 17
Likes: 0
From: Country VIC, Australia
Running in under load procedure? My 383 tune has been tweeked to suit bigger injectors (was 42Lb, now 60Lb on 427, so we can start the engine & check for oil pressure etc.
After that, the consensus seems to be to run the engine in on a dyno under load to prevent the bores from glazing.
The plan seems a bit vague. Is this secret engine builder/tuners business, or is there a common-knowledge best procedure for bedding boosted rings under load on a dyno?
This build will be a daily driver so I'm chasing longevity.
Intercooled 3.3L twinscrew initially
~14Lbs
The Warhawk/Allpro combo with 6 studs should be good for 30Lbs
T56 & 3.73's. Yeeeha!
After that, the consensus seems to be to run the engine in on a dyno under load to prevent the bores from glazing.
The plan seems a bit vague. Is this secret engine builder/tuners business, or is there a common-knowledge best procedure for bedding boosted rings under load on a dyno?
This build will be a daily driver so I'm chasing longevity.
Intercooled 3.3L twinscrew initially
~14LbsThe Warhawk/Allpro combo with 6 studs should be good for 30Lbs
T56 & 3.73's. Yeeeha!
Launching!
Joined: Feb 2007
Posts: 297
Likes: 0
From: Tucson
I was always told rings seat under vacum.
I later comfirmed this when I had a old sbc that had been freshend up, I drove this motor for months with nasty blow by, It was the first time I had an engine where the rings didnt seat. So an old timer told me to get the motor up to temp cruise about 60mph and down shift two gears ( like useing the engine as a brake)untill the truck had slowed to the point where it at idle . I did this three times and no bull the blow by stoped. So the next time I did a motor I would rev it up real slow to high rpm then just let the throttle blades shut quick, basically putting large vacum against the rings.
I later comfirmed this when I had a old sbc that had been freshend up, I drove this motor for months with nasty blow by, It was the first time I had an engine where the rings didnt seat. So an old timer told me to get the motor up to temp cruise about 60mph and down shift two gears ( like useing the engine as a brake)untill the truck had slowed to the point where it at idle . I did this three times and no bull the blow by stoped. So the next time I did a motor I would rev it up real slow to high rpm then just let the throttle blades shut quick, basically putting large vacum against the rings.
Staging Lane
Joined: Aug 2005
Posts: 95
Likes: 0
From: USA
I was always told rings seat under vacum.
I later comfirmed this when I had a old sbc that had been freshend up, I drove this motor for months with nasty blow by, It was the first time I had an engine where the rings didnt seat. So an old timer told me to get the motor up to temp cruise about 60mph and down shift two gears ( like useing the engine as a brake)untill the truck had slowed to the point where it at idle . I did this three times and no bull the blow by stoped. So the next time I did a motor I would rev it up real slow to high rpm then just let the throttle blades shut quick, basically putting large vacum against the rings.
I later comfirmed this when I had a old sbc that had been freshend up, I drove this motor for months with nasty blow by, It was the first time I had an engine where the rings didnt seat. So an old timer told me to get the motor up to temp cruise about 60mph and down shift two gears ( like useing the engine as a brake)untill the truck had slowed to the point where it at idle . I did this three times and no bull the blow by stoped. So the next time I did a motor I would rev it up real slow to high rpm then just let the throttle blades shut quick, basically putting large vacum against the rings.
pressure, short bursts, vary load - no overdrive low RPM wot pulls, and stay at operating temp
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Launching!
Joined: Feb 2007
Posts: 297
Likes: 0
From: Tucson
vacumn does not affect the rings push against the wall, it is all about BMEP. high cyl pressure force ring to outside of wall, making good wear. high BMEP for a long period of time will cause glazing of the wall.
pressure, short bursts, vary load - no overdrive low RPM wot pulls, and stay at operating temp
pressure, short bursts, vary load - no overdrive low RPM wot pulls, and stay at operating temp
I was also toying with the idea that under hard vacum with the throttle blades closed if the cylinder wall gets a little hotter than normal because there is way less fuel to cool the charge and if that in turn heated the rings to a point where they finaly set.
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Joined: Aug 2005
Posts: 95
Likes: 0
From: USA
please follow this link, it covers the information i convey:
http://www.ntnoa.org/enginebreakin.htm
Staging Lane
Joined: Aug 2005
Posts: 95
Likes: 0
From: USA
I gotta ask what is "it is all about BMEP."
I was also toying with the idea that under hard vacum with the throttle blades closed if the cylinder wall gets a little hotter than normal because there is way less fuel to cool the charge and if that in turn heated the rings to a point where they finaly set.
I was also toying with the idea that under hard vacum with the throttle blades closed if the cylinder wall gets a little hotter than normal because there is way less fuel to cool the charge and if that in turn heated the rings to a point where they finaly set.
wall temp is subject of maginitude of wall wetting (decel enrich), AFR, and timing
all are usually kept at safe/minimal levels for longevity
Launching!
Joined: Feb 2007
Posts: 297
Likes: 0
From: Tucson
that has to do with blow by, not seating rings on a new build. the big shots run very big camshafts that do not create large vacumn that a production car would - thus the pump or using an exhaust pull
please follow this link, it covers the information i convey:
http://www.ntnoa.org/enginebreakin.htm
please follow this link, it covers the information i convey:
http://www.ntnoa.org/enginebreakin.htm
