Has anyone tried using a larger crankshaft pulley to increase boost on their supercharger? Besides for the voltage regulator on the alternator, will there be any other negative side effects? My m110 supercharger project is almost complete. The little eaton m45 is only going to make around 3-4psi on this engine, provided there are no boost leaks. I welded a poly v pulley on the charger so I can't get a smaller wheel there. Once all the hardware is in, can I use a larger crank pulley and larger alternator pulley to take the boost up a bit?

There is an RPM limit on the blower, I'd look in forums to find out what it is, and do some calculations. Also, the efficiency drops like a brick on these when they are overdriven; they will also get the incoming air even hotter (detonation).

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86 560SL
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on m111 i have installed a crankpulley from kompressor engine is 185mm in diameter and boost to around 0.4 bar by it drops after 5800rpm

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W123 - M111+Turbo

Hello,
On my m111.943 with Eaton M62 I'm using a 220 mm crank pulley and the pressure is around 0.75-0.8 bar. No probs for the alternator.....so far.

Yikes kumb. That's nice boost. Did you lower the compression on the m111? Did you do a standalone ecu?

Hi,
No I did no. But it does not need lowering. It's already low enough. A local tuner changed and reprogrammed the original ECU (removed the 5800 RPM limiter) and installed me a MAF from a BMW M5.
According to manufacturer maximum continuous kompressor RPM is 14 000 but its no problem to go as far as 17 000 for short periods.