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kenpowell@comcast.net wrote:
I think Al and Bill have been trying to say this politely but .... We all agree that the EWP flows less than the standard pump by alot (maybe only half to 1/3th as much?).
I don't know that I agree with you there, Ken. If the EWP works through the same flowpath as the EDWP, I think your statement is accurate, but the EWP's form factor allows for some ingenuity in creating a less restrictive flowpath. The numbers I've found quoted for actual back-to-back dyno runs comparing the EWP to stock pumps show benefits from 4 to 9 Hp. (a Google search 'meziere pump performance chart' will show several) These numbers are not for 13B engines, and probably have a lot of 'marketing' in them ('cause we all know magazine reviews are objective. Right?), but I'd still consider the ~3Hp gain conservative.
Most importantly, Bob's numbers were raw data and not corrected for actual conditions. The realworld conditions will be much more favorable than his test. If I may be so bold as to shamelessly rip some information from different places without giving due credit:
Poiseuille's Law of The *Flow* of Liquids Through a Tube:
Where:
l = the length of the tube in cm
r = the radius of the tube in cm
p = the difference in pressure of the two ends of the tube in dynes per cm^2
c = the coefficient of *Viscosity* in poises (dyne-seconds per cm^2 )
v = volume in cm^3 per second
Then:
v = pir ^4 p/8cl
*Viscosity of Water as a Function of Temperature*
Temperature
/°C Viscosity
/cP
20 1.002
40 0.653
60 0.467
80 0.355
100 0.282
Pump A Only:
14.0 V 8.4 A 6 GPM 56 F
56F => 14C
180F => 82C
My reasoning:
All other factor being equal, cutting the viscosity to 1/3 will triple the flow. If the WP136 flows 6GPM at 56F, it can be expected to flow 18GPM at 180F, closer to 20GPM at 190F.
Ernest (also a true believer, but so were all those people at Jonestown)
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