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Rotary Car Club (https://rotarycarclub.com/index.php)
-   RX-7 2nd Gen Specific (1986-92) (https://rotarycarclub.com/forumdisplay.php?f=37)
-   -   Pineapple Racing Yoohoo Water Pump Belt (https://rotarycarclub.com/showthread.php?t=1321)

djmtsu 03-30-2008 04:07 PM
Very good point.

It doesn't matter how you go about preventing belt slippage, both the dual alt pulley and yoohoo belt work.

A side mount alternator will remove all belt slippage across the water pump pulley since the belt wraps around over 30% (around).

I have had the dual alt pulley on since I did my TII swap, drove it everyday for a year, been to Deals Gap Rotary Rally twice, and never have had any issues.

Unless you are discussing high RPM's over a long period (ie: racing) everyone is arguing a moot point.

impulsive-RX7 03-31-2008 12:24 PM
Quote:
Originally Posted by MaczPayne (Post 12020)
I have a napa belt on my car. It's priced quite well compared to the pineapple yoohoo belt.
+1. Napa belt part number 3L220 I think.

My5ABaby 03-31-2008 12:40 PM
If a belt breaks, I'd rather have 1 more left turning the pump than none. :p

Phoenix7 03-31-2008 01:08 PM
have you seen the yohoo belt? I dont see how it can break as easily as an ALt belt. I just don't see it breaking anytime soon. I check belts and fluids when I'm filling up so I'll keep an eye on it and keep track of it's condition.

All said and done, I think my method is better.:001_005:

Here is a pic:
http://img.photobucket.com/albums/v1...n/DSC02698.jpg

My5ABaby 03-31-2008 01:32 PM
Quote:
Originally Posted by phoenix7 (Post 12451)
have you seen the yohoo belt? I dont see how it can break as easily as an ALt belt. I just don't see it breaking anytime soon. I check belts and fluids when I'm filling up so I'll keep an eye on it and keep track of it's condition.

All said and done, I think my method is better.:001_005:
I figure it'll break just as easy as an alternator belt. It's spinning at the same speed, has (theoretically) the same stresses on it. If anything, it's longer and has more places to fuck up? :dunno:

Phoenix7 03-31-2008 01:38 PM
it's not longer. It's a short, fat (thick) belt.


Their sales pitch sold me though:

Quote:
The Pineapple Racing Yoohoo Belt™ is a proven means to avoid a slipping water pump on a Mazda rotary engine without an air pump. The alternator belt alone does not provide enough contact with the water pump, so it tends to slip when properly tensioned. If overtightened to stop the slipping, the belt may break and/or cause damage to the engine from side-loading the end of the eccentric shaft, as well as cause damage to your alternator and water pump bearings.

Dual belt alternator pulley setups are a poor alternative because most nominally correct sized belts vary in actual length, making them impossible to tension equally. So, either one belt is too loose and slips or one is overtightened and eventually breaks. Further, if one belt breaks, it usually takes out the other belt at the same time.

The Yoohoo Belt™ runs from the main pulley to the water pump and back. There is no tensioning adjustment. You just walk the belt onto both pulleys and the tension will be correct. It can be a little loose because there is so much contact area that it will not slip. Also, if the alternator belt happens to break, the water pump is still driven. You can drive a lot farther without an alternator than without a water pump, which can be important in order to reach the next exit or the nearest parking lot.

My5ABaby 03-31-2008 01:46 PM
Quote:
it's not longer. It's a short, fat (thick) belt.
I meant my belts are longer. I see now it was a bit confusing how I worded it.

Quote:
Dual belt alternator pulley setups are a poor alternative because most nominally correct sized belts vary in actual length, making them impossible to tension equally. So, either one belt is too loose and slips or one is overtightened and eventually breaks. Further, if one belt breaks, it usually takes out the other belt at the same time.
That's crap.

Quote:
There is no tensioning adjustment.
Translation: God we hope it fits right because if it doesn't you have no way to adjust it. :p

Although the yoohoo belt isn't Pineapple's, on a side note, I don't trust Pineapple. I haven't dealt with them directly, but I don't think they have good business policies. Their 5/6th sleeve inserts have a "Typical improvement is about 8hp, but results vary" yet they refuse to back that up with dyno's. :squint:

Phoenix7 03-31-2008 02:01 PM
:dunno: only time will tell.

My5ABaby 03-31-2008 02:04 PM
Quote:
Originally Posted by phoenix7 (Post 12484)
:dunno: only time will tell.
Nope, I'm right and you're wrong. Lol. j/k

For real though, they're probably both good ways to do it.

In other news, I'm thinking of putting my emissions back on and I'm wondering if I can still run the dual alternator pulley. That'd be one long belt... :o15:

classicauto 03-31-2008 02:13 PM
Quote:
Dual belt alternator pulley setups are a poor alternative because most nominally correct sized belts vary in actual length, making them impossible to tension equally.
Just wanted to address this.

Those running a dual setup and find this problem need to make sure to buy whats known as a match pair of belts. They're cut from the same batch of rubber and thus, are exactly the same size. This is very common for applications like transports that use dual belts, but not so much on these cars so expect that they may need to be ordered in.

classicauto 03-31-2008 02:14 PM
Quote:
Originally Posted by My5ABaby (Post 12486)
In other news, I'm thinking of putting my emissions back on and I'm wondering if I can still run the dual alternator pulley. That'd be one long belt... :o15:
I don't think you can. The airpump belt will ride where the 2nd belt on the dual pulley will go. You can leave the dual pulley on, but it will have one unused sheath.

My5ABaby 03-31-2008 02:14 PM
Quote:
Originally Posted by classicauto (Post 12493)
Just wanted to address this.

Those running a dual setup and find this problem need to make sure to buy whats known as a match pair of belts. They're cut from the same batch of rubber and thus, are exactly the same size. This is very common for applications like transports that use dual belts, but not so much on these cars so expect that they may need to be ordered in.
I've always just picked and chose from what they have and found two that were very close. :dunno: They're still going good.

I'll probably do your way from now on though.

My5ABaby 03-31-2008 02:18 PM
Quote:
Originally Posted by classicauto (Post 12495)
I don't think you can. The airpump belt will ride where the 2nd belt on the dual pulley will go. You can leave the dual pulley on, but it will have one unused sheath.
Hmmm, I'm having trouble picturing it in my head. Is it possible to still use the 2nd alternator pulley slot? In theory...

Phoenix7 03-31-2008 02:26 PM
Good tip classic. I've never heard of that before.

Boostmaniac 04-06-2008 01:44 AM
Good stuff in here.


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