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I spoke with a machine shop friend today
about making pulleys. He shows me his Mazda race car with a 400hp PP 13B,
which I didn't know he had. He believes that a single pulley with a deep
groove should work fine, and that yes, often one belt will take out the
redundant belt. He runs his engine up to 9800rpm without belt
problems. His pulleys are 5 1/8 on the water pump, 3 1/2 drive, which just
about touch. He can make us sets for $110, a bit more for double
pulleys. He has an automatic tool changing mill with something like 27
tools available on this giant chain. It is way cool to watch run.
Pulleys get made on the lathe however. AL comes in 5 and 5 1/2" sizes, so
a 5" pulley may be a better buy than 5 1/8". He would make the pulleys to
order, not as batches, so a 17 or 19mm center hole is no problem. I
wondered how many people were interested in getting some made. I have not
seen any for sale at these prices, although I may have missed some. I saw
some sets as high as $350.
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