dual water pump pulley?

[Greg Amy]

If the water pump pulley is smaller, then it's making the pump turn faster.

Is that a pump pulley or an eccentric shaft pulley? And how does it use dual belts if they're not both replaced?

GA

[tdw6974]

If the water pump pulley is smaller, then it's making the pump turn faster.

Is that a pump pulley or an eccentric shaft pulley? And how does it use dual belts if they're not both replaced?

GA

Greg, that is the water pump pulley. The eccentric pulley and alternator pulley are both dual groove to enable use of 2 belts as a "fail safe" also installing a Water pressure warning light.

[lawtonglenn]

I had to remember why I sent you that link ...

We use the LARGER (ie slower) single pulley ... I think
I just found a dual pulley since you wanted to belt and
suspenders yourself by using two identical belts at the same time

I didn't know then, nor does Atkins list, the diameter of their double pulley

sorry!

[chuck baader]

Went back and reread...my mistake. That is why various vendors sell a set...smaller crank, wp, and alt. BTW, pulleys are free, but it does not say you can change the number of belts

[Greg Amy]

Meh, I think they're OK. "Alternate" pulleys are allowed (with no subsequent restriction to their design) and "type" of drive (toothed, v-belt, etc) has to remain the same. It doesn't run afoul of the "prohibited function" clause...

"If it says you can..."

[chuck baader]

Greg, I disagree. It is not OEM stock and the "if it does not say you can..." rule does apply, just like not being able to change type of belt (expressly prohibited).

When I bought my RX7 I did extensive research on pulleys. The only thing I thought legal was the spherical bearing belt tension adjuster available. Remember, there is way more involved in changing the crank pulley than a simple bolt on!

[Greg Amy]

Greg, I disagree. It is not OEM stock and the "if it does not say you can..."

It actually does say you can. 9.1.3.D.n:

"Alternate water pump, alternator, power steering, and crankshaft pulleys of any diameter or material may be used. Type of accessory drive (e.g., V-belt, toothed belt, etc.) shall remain as stock."

There is no subsequent restriction to its "alternate" design. Ergo, the Roffe Corollary kicks in: "If it says you can, then you bloody well can!"

GA, reminding rules writers of Tip #3...


Edit: Just to clarify my point, Chuck, the following two sentences do not mean the same thing:

"Alternate water pump, alternator, power steering, and crankshaft pulleys of any diameter or material may be used."
"You may change the diameter and material of water pump, alternator, power steering, and crankshaft pulleys."

The first one allows alternate pulleys, adding (pointlessly) that the diameter and material may be changed (once you allow an alternate of something, it's open unless otherwise restricted.) The second one says you can use another pulley but you can change diameter and material only."

[chuck baader]

OK, you can change pulleys, but no where does it say you can add another belt:026: