i dealt with frank when i set up a wholesale account, he seemed pretty cool at the time, but really never got the chance to order anything with it.
on a side note, i'm about to install an AEM Underdrive pully when i reinstall my LD9... are those known to get the same issue??
The only RK Sport part going on my car is the discontinued lightweight flywheel.
AEM only made an alternator pulley..............
PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO
yeah i dunno what i was thinking... i meant OBX - precision power under drive
Edited 1 time(s). Last edited Tuesday, January 05, 2010 8:01 PM
so.......anyone know if the issues with these have been resolved? if not someone care to point me in the direction of a decent eco pulley?
I kept the same pulley, but had a local machinist machine down where the groove cut into the pulley, and he pressed on a hardened steel sleeve in its place, like rksport should have done all along. Its fixed now.
Currently #4 in Ecotec Forced Induction horsepower ratings. 505.8 WHP 414WTQ!!!
Currently 3rd quickest Ecotec on the .org - 10.949 @ 131.50 MPH!!!
Roofy wrote:I kept the same pulley, but had a local machinist machine down where the groove cut into the pulley, and he pressed on a hardened steel sleeve in its place, like rksport should have done all along. Its fixed now.
Yep, works fine. That is what I have done for a few people now.
PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO
is rksport the only pulley available for eco's? and then even after buying it it's a pretty big possibility that it'd have to be machined even after that?
Wow. A few years ago I got one of these pulleys and the belt to go with it. I never got around to installing it and sold it. Now Im really glad i did too. At that time I was driving a lot and would have put 15-20K on it in around 6 months.
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No,
If I was to buy a pulley today I would buy a NEW MRZ pulley, if you were revving no more than 500 RPMs higher than stock. I wouldn't get ANY aluminum pulley if you revving a lot higher than stock even with the Hardened GM Oil Pump Gears. The NEW MRZ pulley has a steel ring to prevent the groove from forming to start with. The older design had a few pulleys brake, leak oil, and rip out the keyway.
I wouldn't get a cobalt addition pulley. They have failed a few times, and the two piece design
The custom car grillz pulley was designed for the Saturn Ecotec motor. It does fit fine, but a few people have had them bend and crack under higher horse power.
RKSports hold up fine to a lot of power, but fails at the keyway under high RPMS, and the groove does form and start to leak after a while.
Frackie Z / Z-Spec / RSM Racing is exactly the same as the RKSport Pulley.
I'm on design 3.5 and really haven't came up with something I'm 100% behind, and if I'm not 100% it will not be sold. I have designed a few one off designs from steel for people, but I still haven't came up with an aluminum design that isn't under a ton of stresses at stock Redline.
PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO
thank you for the info md.