Anyone know the alternator pulley and crank pulley size for the 6-rib? I assume when I did my Whipple 4.0 upgrade that didn't change the speed of the 6 rib? I heard the alt pulley is 59mm...
Pulley and crank pulley size
- Thread starter FBA
- Start date
I had thought you were referring to the practice of undersizing pulleys. The SC belt drives the power steering pump and SC. More boost is achieved on the OEM or Whipple SC by changing the size of the pulley at the SC. (Smaller pulley = higher RPM = more boost).
As Kendall says - when you fit a Whipple (or just a smaller pulley on a stock blower) you don't change anything else apart from the belt to accommodate the new pulley. So everything else runs at the same speed it always did.
Oh...lol, no, they just oversized the alt pulley itself to avoid the thing grenading as it's done 4x in the past 8 weeks...and now I'm looking for another solution but need to get the stock crank and alt pulley size. My guess is that this OEM alt casing is junk and it's warping slightly under WOT, causing the internals to grenade...