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Re: V12 Starter Motor Sound -- Distinctive? (archive)

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Posted by David F on August 10, 2001 at 14:26:37:

In Reply to: V12 Starter Motor Sound -- Distinctive? posted by Jason Ferguson on August 07, 2001 at 15:22:05:

Here are my thoughts on why the starter makes the unusual sound: The starter motor is physically very small which is necessary to fit in the tight space alotted. Due to the small size, a set of reduction gears are used to increase the torgue at the pinnion gear. The unique sound, IMHO, is a result of the fast motor speed (to counteract the reduction gears) combined with the noise created by the planetary reduction gears.

Does anyone know exactly why the starter-motor sound on the V12 is so distinctive? The other BMW models have the usual repeating-pulsing starter noise, yet the V12's have a solid, smooth crank-up sound. Is it just that the extra cylinders increase the number of pulses, and the extra number of pulses just smooths out what would ordinarily be a more staccato sound?

As well, I once thought that this sound was unique to the BMW V12. However, the Ferrari 456 V12 starts up with almost the exact same sound, as does the 2001 MB S600. Not sure about the previous generation MB S600.

So, any thoughts?

Jason F.

Here's a link to Odd-Jarle's 750 startup-sound . . .

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