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337 Posts
Discussion Starter #1
I'm looking at one for my daily beater, a Ford Focus. Nearest I can figure, mathematically, my CFM requirements are as follows:

1,000 rpm -- 1.45744463
1,500 rpm -- 2.186166945
2,000 rpm -- 2.91488926
2,500 rpm -- 3.643611575
3,000 rpm -- 4.37233389
3,500 rpm -- 5.101056206
4,000 rpm -- 5.829778521
4,500 rpm -- 6.558500836
5,000 rpm -- 7.287223151
5,500 rpm -- 8.015945466
6,000 rpm -- 8.744667781
6,500 rpm -- 9.473390096
7,000 rpm -- 10.20211241
7,500 rpm -- 10.93083473
8,000 rpm -- 11.65955704

I was thinking of trying the GZ budget pump, but seems at low pump speeds the 101/102 do better ... and for a few extra bucks I think it's worth going with them. Just have to play with pulley size to 'tune' it for what I want.

Couple questions though,
Are they rebuildable? Cost?
What is the longevity of daily use?
Does an off the shelf water pump pulley fit (most water pump pulleys I can think of are 3 bolt)?
Is there a vacuum relief valve built in or do I have to buy one separate? ... anyone happen to know of a digital and programmable valve (industrial application possibly, just curious)?


End goal is 15 to 16" through the RPM range. With my hokie setup now I can make about 10" but it drops as I increase throttle. I've gained average of 1MPG and it feels like some low RPM TQ as well.

Realize it an odd question for this site, but I know I'll get better answers here than anywhere else, more knowledgeable people.


-John
 

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Discussion Starter #3
Not real quick. Iron block and rings. Been running my hack method for about 4 years now with no loss of compression or increase in leakdown. About 50,000 miles. But nice thing is I can pick up a good salvage engine for about $300. So I'm not concerned with ware at all.
 
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