Thread: pump cone
06-24-2006, 10:31 PM #1
does a aftermarktet pump cone really do anything?
also, i know i have a 14/20 but when i got my impeller backf orm island it says 13/20 on it, how do you read these what is the first numbe rmeen and what does the secound.
06-24-2006, 10:33 PM #2
not really -- it does help with the CC Racers that are out there (0-30mph Anti-Cavitation during the first 2 seconds of a race), but for what we do, save your money.
06-24-2006, 10:55 PM #3
uhm....did he scribe 13/20 on it? they normally say 14/20 I beleive
well, the 14/20 I bought form Carl actually reads 13/20 on a pitch gauge. this is common on the 14/20 dyna-fly's. He even told me a box stock 14/20 will read 13/20 on a gauge. When mine arrived, I measured it and sure enough, it did.
the first number (14) is the leading edge of the impeller that sees the water first as it takes it in. This sets the characteristic of your holeshot leading up to your midrange.
the second number (20) is the trailing edge that pushes the water out. this sets the characteristic continuing from your midrange up to your top end.
there are alot more factors tha come into play also....
any more detailed questions such as root angle, rake, sweep, hub measurement yada, yada yada , and you'll need to send an inquiry to an impeller specialist like speedfreak, Carl or Impros.
On Impros website, click on tech info for some good detailed information.
06-25-2006, 08:33 AM #4
yea, 13/20 was scribed on it, no big deal just curious.
06-25-2006, 08:38 AM #5
If you want to try it I've got an R&D performance cone sitting in my garage. It did help with cavitation out of the hole, but I never saw any top speed increase with it.
06-25-2006, 09:24 AM #6
Well everyone claims it helped cavitation out of the hole, would you be willing to sell it? I have jsut gotten started in cc, so i could use it. Just name a price and i could come pick it up some day this week if you are willing to sell it. Thanks
06-25-2006, 12:40 PM #7
MD, I just noticed you have a 2005. Sorry, the pump cone's for the older, smaller hub pumps.
06-25-2006, 12:56 PM #8
06-25-2006, 09:08 PM #9
I have one for the late model pump if ya need. PM me
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