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Car Forum / Porsche / Porshe 911 / August 2006My new C2 -- Break-In limits on RPM??? How critical is it?
My new 997 (took delivery yesterday) is supposed to be kept under 4200 RPM according to the owner's manual, for the first 2000 miles. Yet the salesman, who has owned many 911s, says that driving it too gently during the break-in period can cause problems. Something about engine seals needing at least some early stress in order to seat properly--otherwise oil leaks will be a problem, for example. And also something about a computer chip analyzing early driving patterns and adjusting timing patterns that may lead to poor compatibilty and performance when driving habits change after the break-in period. Anyway, for a few blocks after driving it off the lot I would bring it to 5000-6000 RPMs briefly while accelerating to maybe 50-60 mph. That's it. The rest of the 200 miles on the car now have been pretty sedate. My question: Is there any risk of serious damage with very brief revs above 4200 at this early stage? And on the other hand, is there any disadvantage in keeping it below 4200 RPM at *ALL* times? Or is the warning about 4200 RPM really about sustained periods or heavy loads? Congratulations on the new car! Brief periods of higher RPM will not harm the engine and are really a positive thing. The factory doesn't want the engine run at higher RPM for sustained periods. However, once it's warmed up, a few spikes to higher RPM are just fine. I don't know what the factory is specing for the first oil change; however, I'd change the oil and filter after that first 2,000 miles. Even computer engine milling is going to leave some small irregularities and there just has to be some metal particles floating around in the oil and filter. Enjoy! > My new 997 (took delivery yesterday) is supposed to be kept under 4200 RPM > according to the owner's manual, for the first 2000 miles. [quoted text clipped - 15 lines] > disadvantage in keeping it below 4200 RPM at *ALL* times? Or is the > warning about 4200 RPM really about sustained periods or heavy loads? > Congratulations on the new car! > [quoted text clipped - 10 lines] > > Enjoy! I have to agree. The idea is to not keep the engine at a constant RPM for any length of time, so a few blips above recommendations would probably be good. So, revving it up a bit is better than breaking it in by going on a road trip on the Interstate for 2000 miles and never varying the speed. There are a lot of theories about breaking in a new car. Why not search the net for a few. Also, the computer will readjust to your new driving after the break-in period, so I wouldn't worry about that. |
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