525sc Blower Pulley???
04-09-2009, 11:36 AM
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525sc Blower Pulley???
Hey Anyone Know Anybody Making A Upper Pulley Smaller Than 2 7/8" With Merc. Spline Rather Than Keyway Style For A 525sc 177 Blower?
Post Or Call Jeff @ 269-998-5914
Post Or Call Jeff @ 269-998-5914
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04-09-2009, 05:04 PM
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The easiest way to accomplish this is to get the shaft with the keyway and use the "automotive pulleys". I believe that the 2.85" splined pulleys are the smallest that were made by non-merc sources. I would think twice about spinning that little blower too hard, if it self destructs then you will have a whole new set of problems. I run a 2.85" upper and a 7" lower and I see a little over 6 psi boost (below the chiller) at WOT which is about 5000 rpms with my current prop. I'm good with that for now.
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04-09-2009, 11:00 PM
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Old Navy's right, u have to buy the new shaft and use the automotive pulleys. Merc doesn't make the parts anymore. I went through this on my 31 Sonic. I couldn't even find a used stock pulley. I'm lucky to have a tool and die maker as a good friend. He made the shaft and pulley. BTW- I had him take 3/8 off the diameter and ran 9 pounds on that 177. It was fine.
04-09-2009, 11:29 PM
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I went with the next size smaller automotive pulley and it only picked up 1-2 mph...made a ton more noise/whine and burned a lot more fuel, not worth it.
http://www.offshoreonly.com/gallery/...hp?photo=13347
http://www.offshoreonly.com/gallery/...hp?photo=13347
Last edited by Back4More; 04-09-2009 at 11:32 PM.
