Here's my experience with alternator pullies from my '62 TR4's alternator
conversion:
There are several routes that can be taken regarding pully selection with
an alternator conversion.
1. Keep the stock alternator pully and convert your crank and water pump
pullies to a thin belt.
Pros: Cheaper, more commonly available belts, and the replacement water
pump pully is aluminum with less reciprcating mass.
Cons: Expensive. Around $300 last I checked.
2. Keep your wide belt, and take the original generator pully and have it
drilled out to the shaft diameter of the alternator.
Pros: Cheap, semi-original looking, and you keep your wide belt.
Cons: The stock generator pully is somewhat large comparatively, and it
makes the alternator a little under-driven. I found my alternator didn't
'kick-in' until I reved the motor above 1300-1500 RPM
3. Keep your wide belt, and find a replacement 3/4" belt pully for the
alternator which is smaller in diameter than the generator pully. This is
what I did AFTER trying #2 for a year or so, and I've been happy with the
results. The pully cost $20 from an alternator shop.
Pros: Charges as sub-1000 RPM idle.
Cons: Haven't found any yet.
-jeffrey
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