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They were, but...
Posted by Jeff S. (more from Jeff S.) on Fri, 3 Aug 2001 09:15:03
In Reply to: I hope your #s are theoretical, steveC in BC, Thu, 2 Aug 2001 16:48:27
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Metric Mechanic (a BMW rebuilder and tuner) has a table on their website showing life expectancy vs. rpm. They also go into what breaks down, Brian is basically right load (hitting the top of the piston with a 5 # hammer vs. a 20 # hammer) and rpm (higher values means faster mean piston speed as well as larger acceleration/forces on the connecting rod) are the too killers.
As an example to engine speed/load and longevity, my dad's BMW 325e (low rev, high efficiency) went 360 k miles on the first motor until something broke in the timing mechanism (not the timing belt). It now has 425 k miles. While I have seen pictures of the S2000 engine torn apart after several thousand miles ( I think that was due to quality problems). I also have a neighbor with a Type-R that got a new clutch at 40k miles due to the springs on the pressure plate breaking. Crotch rocket motorcycles that rev to 10k plus need to be rebuilt VERY often.
Of course I regularly take the revs near the redline in both the Saab and E-30 M3!!! Life's to short not to enjoy yourself.
Posts in this Thread:
- what determines redline ?, JeffS2, Thu, 2 Aug 2001 15:27:41
- Who has a saab engine that goes to 9000rpm?, Cutic, Thu, 2 Aug 2001 16:30:40
- Who has a saab engine that goes to 9000rpm?, Cutic, Thu, 2 Aug 2001 16:30:38
- My $0.02 (long), Jeff S., Thu, 2 Aug 2001 16:27:55
- valve float is one thing n/m, saabaru, Thu, 2 Aug 2001 16:19:47
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, Thu, 2 Aug 2001 18:53:01