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Kelly and all,
I might have missed this too, but do you know if anyone (like the racers) has looked into impeller design of EDWP and come up with something that operates better in our envelope? The turbine looking design of the EWP suggests that a unit like that /hugely/ underdriven would be much more optimal for our purposes. But unless it was really popular, would probably be hugely expensive. As for your pulleys, 5" doesn't sound like a lot to me. A pump that works in stop-and-go traffic with the AC on and engine at idle (< 1000 rpm) seems like it would work OK at 7500 rpm with about a 8" pulley, unless you're planning on going with a smaller drive pulley to underdrive the alternator too.
I'm currently looking at a 13B with RD1C operating at 7500 rpm cruise and capable of 8000 or so if I get in that big a rush. Stock pulleys wouldn't do at all for that application I'd think. I need about 210 hp for what I aim to do, and extrapolating 160 hp linearly from 6000 rpm barely gets me there. Anyway, I need to start keeping better track of happenings on this list.
Sorry to be doing all this catching up "on company time" ... Jim S.
Kelly Troyer wrote:
Georges, Ed and all interested,
The following excerpt from Bill Jepson adds more info about the stock waterpump and
would seem to show the wisdom of reducing pump RPM for those of us using Tracy's
RD1C 2.85 redrive.......I will be ordering the 5 " diameter pump pulley today and when
received will report on quality, fit, etc as necessary for our needs...... --
Kelly Troyer
Dyke Delta/13B/RD1C/EC2
(Copied and pasted from eariler post)
Jim, I agree that 12-34 GPM is a big window. One of the items that always drove my skecptisim over the EWP is that in almost every thermodynamic text I've read turbulent flow is cited as helpful to heat transfer. This would be short of cavitation of course. Volume is always the second item, or sometimes interchangeable. I'm sure this is what drives the "other list's" refusal to believe the EWP will work. I AM willing to accept a actual test. Thanks Todd Leon and whoever has tried. Somewhere there is an incorrect assumption being made. I'd like to know where, so I'd be more comfortable, but I am always willing to believe my eyes, and my temperature guage! As a side item, when I spoke with Steve Wienzerl the designer of the newer PowerSport reduction drive, he said they tested the EDWP to max flow. The claimed volume was 55 GPM somewhere between 6500 and 7000 RPM. He was sure this was on the ragged edge of caviitation. He wasn't a EWP believer, in fact he wanted even more flow than they were getting!
Bill Jepson
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