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Single (alternator / water pump / main) belt + no air pump is asking for trouble.
There is very little contact of this belt with the water pump pulley.
You can spin the water pump (pulley) by hand pretty easily, no matter how tight you adjust the alternator.
This is where double (sheave alternator) pulleys are popular - very popular in Japan.
The key to this set-up is to run two brand new belts.
Watch out for Gates belts - Gates makes more than one type of belt with the same part number that are slightly different dimensions.
(I've seen three different types myself.)
Lots of chain auto parts stores use rebadged Gates belts as their own.
Easy to check at the counter by pulling both belts together and check the tension - it'll be obvious if one is smaller.
No reason to worry about overtightening.
Use the rule-of-thumb of 1/2" deflection at widest part, and you should be good.
There is always the danger is problems due to overtightening, whether it be two or one belt.
I don't like that yoohoo belt, cause I'm at the mercy of a single vendor.
I never bothered to look up the generic corresponding part number myself.
It's just easier to just order two belts for the vehicle application.
I've been running double pulleys and double belts almost ever since I've had my FC from 1995 - over 15 years ago.
In fact, this was one of the very first mods on the car.
I've never had a single problem running my car this way.
-Ted
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