thunder550

iTrader: (70)

I know there's a few of you guys running 10 rib belt setups for your blowers. Have any of you have issues with bearings or anything from the extra side loading of the accessories?

moehorsepower

iTrader: (3)

I had to run a 12 rib set up to prevent slippage and yes it did cause some main bearing wear only after around 5000 miles, wish I would of taken pics of the bearings...

thunder550

iTrader: (70)

What made you notice? Did you start to lose oil pressure or something? I wonder how much extra force a 12 rib puts out over a 10 rib.

moehorsepower

iTrader: (3)

No loss of oil pressure, I was just worried about the crank because the belt had to be extremely tight or I would get belt slippage, I did not think that this could be good and the talk about parasitic drive loss interested me in a turbo,and the cost of the 12 rib belt at a $100.00 a pop. I pulled the motor just to check the bearings out, thats how I found out about the wear, A friend of mine has a 67 stang with a 427 supercharged and he said that he was having to change out the mains app every 10,000 miles...

BadgeZ28

iTrader: (28)

It can't be good. We need someone to come up with a fan clutch type engagement

thunder550

iTrader: (70)

Hmm...I thought one of the advantages to more ribs was that you didn't have to have a super-tight belt.

Grr

iTrader: (2)

yeah, after looking at mine i planned to loosen it just a hair today. No need to put that much stress on the bearings if its not slipping

thunder550

iTrader: (70)

Thanks for the info guys...I decided to go 8 rib instead of 10. I'd rather have some belt slip than have to replace the main bearings every 10k miles.

Grr

iTrader: (2)

i think you have that backwards? Going with a 10-rib allows you to keep the belt looser before slipping, with the 8-rib you actually have to tighten the **** out of it. I loosened my 10rib today so i can rotate it about 90* and still no slip, i think a 8-rib would be slipping in that case

thunder550

iTrader: (70)

But there's the tradeoff that a 10 rib puts more side load on all of the pulleys too. I don't know which is better.