Break in question
#46
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Originally Posted by 1999Porsche911
.... I rebuilt by first engine the year you were born. For those of us that have extensive experience in rebuilding and working on engines, we are able to determine what is best for our engines....
#47
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Originally Posted by Fishman
1999, you seem to know a lot about cars. Do you work in the automotive industry in some capacity or is it a hobby for you?
No I don't work in the automotive industry. Learning about engines and cars was a necessity due to me never having any money to hire someone to fix my cars. In the beginning, I quite often spent more doing my own repairs because of breaking things, but it was a good way to learn. I still have never rebuilt an engine where I didn't have at least some minor part left on the table after it was put back together. Most often a washer or two, My first engine was reassembled without a piston. That was funny.
Enjoyed it so much that I have always fixed and rebuilt my own and others for enjoyment. I do not like not knowing how things work which drives me to tear things down and put them back together. I was a tool and die guy for years and then went into banking. I retired from the financial services industry at age 35 (14 years ago) and have been a Venture Capitalist and equity trader ever since. It leaves alot of time on my hands to do what I want to do.
#48
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Splain to me why the rev limiter works when you accelerate to say 7200+, but doesn't work in a downshift situation when trying to shift from 5th to 4th and accidently sitting second instead. If it were a true "Rev Limiter" it should work both ways.
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Splain to me why the rev limiter works when you accelerate to say 7200+, but doesn't work in a downshift situation when trying to shift from 5th to 4th and accidently sitting second instead. If it were a true "Rev Limiter" it should work both ways. The centrifical force of the engine @ 7000++ may have something to do with the rev limiter not working on the missed shift ??
#50
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Originally Posted by Larry Harris
Splain to me why the rev limiter works when you accelerate to say 7200+, but doesn't work in a downshift situation when trying to shift from 5th to 4th and accidently sitting second instead. If it were a true "Rev Limiter" it should work both ways. The centrifical force of the engine @ 7000++ may have something to do with the rev limiter not working on the missed shift ??
#51
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Originally Posted by Fishman
That would make sense, but the reason why the alternative break in plans are attractive is because the people who have followed the system in the owner's manual often end up with cars that exhibit symptoms of cars that have been improperly broken in, such as burning oil, thus making it appear that the manual's system doesn't work.
#53
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Originally Posted by boolala
Well I followed the break-in "by the book" and have not had any measurable oil consumption in first 8600 miles..... and counting.
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The European owner's manual make no mention of exceeding a specific RPM. I followed the Euro "break-in" recommendations for my '02 996 and I intend to follow the same "break-in" with my 997. I had no mechanical problems with the 996 in almost four years and 21,000 miles of use.
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I would define "high engine speeds" as 85-90% of red line or approx 6120-6500 rpm. If 4,200 rpm was some "magic number" why wouldn't they say so outside of the U.S.
AFAIK Porsche tests new engines at full power on a dyno for 10 minutes after only a 10 minute warm-up period at the factory.
AFAIK Porsche tests new engines at full power on a dyno for 10 minutes after only a 10 minute warm-up period at the factory.
#57
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Originally Posted by P997C2S
I would define "high engine speeds" as 85-90% of red line or approx 6120-6500 rpm. If 4,200 rpm was some "magic number" why wouldn't they say so outside of the U.S.
AFAIK Porsche tests new engines at full power on a dyno for 10 minutes after only a 10 minute warm-up period at the factory.
AFAIK Porsche tests new engines at full power on a dyno for 10 minutes after only a 10 minute warm-up period at the factory.
I have seen the dyno rig in use when they were building 996s, and it uses a remote oil supply, undoubtedly with special filtering to get rid of all the manufacturing dust and particles. After the motor goes in a car, they take the car out for a drive on the Autobahn near the factory. They wouldn't let us take pictures inside the factory.
#58
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One bit of advice to those that are concerned about proper break-in: don't ever buy a Porsche off the Dealer's lot. Order one.
A couple of years ago, one of my sons worked during the summer as a lot boy for a Porsche Dealer. He told me that on many occassions he would see guys test drive Porsches that had only a few miles on the odometer, and many of these guys would lay a patch of rubber as they drove off the Dealer's lot. My son asked the salesmen why they allowed the Porsches to be abused by the guys taking test drives. The salesmen would tell my son that the guys test driving the cars had all bought Porsches from the Dealer before and they didn't want to offend them.
It would be interesting to conduct a long term study on those "abused" cars to determine if they experienced more quality problems than those that were broken-in according to factory recommendations.
A couple of years ago, one of my sons worked during the summer as a lot boy for a Porsche Dealer. He told me that on many occassions he would see guys test drive Porsches that had only a few miles on the odometer, and many of these guys would lay a patch of rubber as they drove off the Dealer's lot. My son asked the salesmen why they allowed the Porsches to be abused by the guys taking test drives. The salesmen would tell my son that the guys test driving the cars had all bought Porsches from the Dealer before and they didn't want to offend them.
It would be interesting to conduct a long term study on those "abused" cars to determine if they experienced more quality problems than those that were broken-in according to factory recommendations.
#59
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Originally Posted by fast1
One bit of advice to those that are concerned about proper break-in: don't ever buy a Porsche off the Dealer's lot. Order one.
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The following is from the virtual factory tour. I don't think Porsche would subject a new engine with no miles on it to WOT testing if it was going to damage it or reduce its service life in any way.
Zuffenhausen Engine Assembly
"The following hot test is the final step in the engine production process. The engines are first of all heated up to operating temperature and then subjected to a functional test including full-throttle testing. Information in the form of up to 220 parameters is generated in this test of around five minutes' duration."
Zuffenhausen Engine Assembly
"The following hot test is the final step in the engine production process. The engines are first of all heated up to operating temperature and then subjected to a functional test including full-throttle testing. Information in the form of up to 220 parameters is generated in this test of around five minutes' duration."