Break in a 991
05-30-2014, 11:37 AM
#46
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05-30-2014, 01:22 PM
#47
Burning Brakes
Or questions on an internet forum. More often than not they'll get answers that can vary from helpfully reinforcing to neutral to downright punishing. Every once in a while they get me and hit the jackpot. Like this one here, for example. More than makes up for the punishment of the last three before Dukes. And there you go.
05-30-2014, 05:31 PM
#49
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Motomans conclusions are based on a false assumptions.
"Nowadays, the piston ring seal is really what the break in process is all about. Contrary to popular belief, piston rings don't seal the combustion pressure by spring tension. Ring tension is necessary only to "scrape" the oil to prevent it from entering the combustion chamber.
If you think about it, the ring exerts maybe 5-10 lbs of spring tension against the cylinder wall ...
How can such a small amount of spring tension seal against thousands of
PSI (Pounds Per Square Inch) of combustion pressure ??
Of course it can't. "
The ring exerts 5-10lb of literal pressure and is opposed by the cylinder wall. The ring is resting in the piston groove which can easy support combustion pressure. Only a small surface area of the ring is exposed to the combustion chamber pressures. I can see that it has no engineering background or much knowledge on what he's talking about
"Nowadays, the piston ring seal is really what the break in process is all about. Contrary to popular belief, piston rings don't seal the combustion pressure by spring tension. Ring tension is necessary only to "scrape" the oil to prevent it from entering the combustion chamber.
If you think about it, the ring exerts maybe 5-10 lbs of spring tension against the cylinder wall ...
How can such a small amount of spring tension seal against thousands of
PSI (Pounds Per Square Inch) of combustion pressure ??
Of course it can't. "
The ring exerts 5-10lb of literal pressure and is opposed by the cylinder wall. The ring is resting in the piston groove which can easy support combustion pressure. Only a small surface area of the ring is exposed to the combustion chamber pressures. I can see that it has no engineering background or much knowledge on what he's talking about
05-30-2014, 06:18 PM
#50
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drove it like I stole it from day one! 
I'm not always hammering it, but I drive however I want when I want.
Sports+ 95% of the time and no worries of redlining it
I'm leasing mine so I know it will be gone in a couple years (or sooner if I do a pull ahead) and it will be under warranty for my duration so......
I'm not always hammering it, but I drive however I want when I want.
Sports+ 95% of the time and no worries of redlining it
I'm leasing mine so I know it will be gone in a couple years (or sooner if I do a pull ahead) and it will be under warranty for my duration so......
05-30-2014, 11:27 PM
#51
Burning Brakes
drove it like I stole it from day one! I'm not always hammering it, but I drive however I want when I want. Sports+ 95% of the time and no worries of redlining it I'm leasing mine so I know it will be gone in a couple years (or sooner if I do a pull ahead) and it will be under warranty for my duration so......
I'm not always hammering it, but I drive however I want when I want. Sports+ 95% of the time and no worries of redlining it I'm leasing mine so I know it will be gone in a couple years (or sooner if I do a pull ahead) and it will be under warranty for my duration so......
05-31-2014, 03:04 AM
#53
Pro
Thread Starter
Bummer, I was under the impression that all engines are dyno making sure that they all produce at least the amount of HP advertised. So what are you saying is that the engines are put in the car and never even fired once to make sure they are all working properly?
05-31-2014, 03:50 AM
#54
Totally. And it might be even worse than that. I sometimes feel I'm writing as much for my own entertainment as others. Like right this moment, channelling Ferdinand Porsche, "I couldn't find the post I was looking for, so I decided to write my own. If it pleases me, perhaps it will please others as well." More on that, tomorrow.
05-31-2014, 03:58 AM
#55
Motomans conclusions are based on a false assumptions.
"Nowadays, the piston ring seal is really what the break in process is all about. Contrary to popular belief, piston rings don't seal the combustion pressure by spring tension. Ring tension is necessary only to "scrape" the oil to prevent it from entering the combustion chamber.
If you think about it, the ring exerts maybe 5-10 lbs of spring tension against the cylinder wall ...
How can such a small amount of spring tension seal against thousands of
PSI (Pounds Per Square Inch) of combustion pressure ??
Of course it can't. "
The ring exerts 5-10lb of literal pressure and is opposed by the cylinder wall. The ring is resting in the piston groove which can easy support combustion pressure. Only a small surface area of the ring is exposed to the combustion chamber pressures. I can see that it has no engineering background or much knowledge on what he's talking about
"Nowadays, the piston ring seal is really what the break in process is all about. Contrary to popular belief, piston rings don't seal the combustion pressure by spring tension. Ring tension is necessary only to "scrape" the oil to prevent it from entering the combustion chamber.
If you think about it, the ring exerts maybe 5-10 lbs of spring tension against the cylinder wall ...
How can such a small amount of spring tension seal against thousands of
PSI (Pounds Per Square Inch) of combustion pressure ??
Of course it can't. "
The ring exerts 5-10lb of literal pressure and is opposed by the cylinder wall. The ring is resting in the piston groove which can easy support combustion pressure. Only a small surface area of the ring is exposed to the combustion chamber pressures. I can see that it has no engineering background or much knowledge on what he's talking about
05-31-2014, 08:43 AM
#56
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The point of the brake in is for the moving parts to get polished against each other.
I like to call a polishing expert to the stand:
ps. My internal combustion engine research was funded by University of Michigan and resulted in a patent.
I like to call a polishing expert to the stand:
ps. My internal combustion engine research was funded by University of Michigan and resulted in a patent.
05-31-2014, 09:49 AM
#57
1st Gear
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No mention in the uk manual about not going above 4000 revs,just says to avoid short trips,don't take part in track events and avoid high engine speeds especially when cold.
The advise I was given was to drive it as normal.
I have owned a 996 turbo s from new didn't run that in and 10 years later not a single problem.
Porsche don't help here as they seem to give different advise in drivers manuals depending where you are
The advise I was given was to drive it as normal.
I have owned a 996 turbo s from new didn't run that in and 10 years later not a single problem.
Porsche don't help here as they seem to give different advise in drivers manuals depending where you are
05-31-2014, 09:49 AM
#58
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Totally. And it might be even worse than that. I sometimes feel I'm writing as much for my own entertainment as others. Like right this moment, channelling Ferdinand Porsche, "I couldn't find the post I was looking for, so I decided to write my own. If it pleases me, perhaps it will please others as well." More on that, tomorrow.
05-31-2014, 10:16 AM
#59
No mention in the uk manual about not going above 4000 revs,just says to avoid short trips,don't take part in track events and avoid high engine speeds especially when cold.
The advise I was given was to drive it as normal.
I have owned a 996 turbo s from new didn't run that in and 10 years later not a single problem.
Porsche don't help here as they seem to give different advise in drivers manuals depending where you are
The advise I was given was to drive it as normal.
I have owned a 996 turbo s from new didn't run that in and 10 years later not a single problem.
Porsche don't help here as they seem to give different advise in drivers manuals depending where you are
05-31-2014, 10:24 AM
#60
Three Wheelin'
I wouldn't have thought that would be necessary as they all drive in straight lines across the pond.