Focus Fanatics - View Single Post - Lightweight water pump pulley
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Old 07-15-2013, 02:48 PM   #47
amc49
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Join Date: Mar 2012
Fan#: 96610
Location: Fort Worth, TX
What I Drive: 00 wagon, 02 sedan both zetec atx

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Not against underdrive pulleys at all. We used to make our own for the AMC drag engines until Traco Engineering (the Trans Am guys) stepped up to make some up. I even cut off every other water pump impeller blade to make a setup that cooled fine and quick at the strip but also made 20+ hp over 6000 rpm. The Booth-Arons Gremlin at the time claimed 26 hp on their 356 inch motors. It can be done but as a system, and a percentage of your size motor's output. You get no raging numbers from small inch motors, only small bits, of course they all add up. One pulley brings something to the table but you cannot feel it by itself. Human optimism is 20% of all dyno increases.
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