Pump pressure taps

Devilman

Devilman

Well-known member
Tint could probably tell you... and if not, he could tell you where to look to get the info. May do a search on PB, I've seen it ome up lots over there.
 
H

HammerDown

New member
Motor Head said:
I was just trying to post it up over on PB but I have a hard time posting from my phone there for some reason?
Click to expand...

I will take a pic of mine and post it for you Bobby. Basically I put mine in front of the the wear ring at 1 o'clock and 5 o'clock. 
 
M

Michael Swindoll

New member
Yes if you are looking at the pump from the bearing side it go's at 11'o clock behind the wear ring try to drill it as straight as posable so that it dont read false! Im sure 1'o clock would work also!
 
txliberator

txliberator

New member
Here ya go,

http://www.performanceboats.com/jet-boats/72532-intake-pressure-tap-location.html

This thread has good pics and Mcmaster PNs

http://www.performanceboats.com/jet-boats/72532-intake-pressure-tap-location.html

:wink:
 
G

Gold Member

New member
So Im guessing by reading that that I need 30-40 psi? Is that at max speed? Wouldn't the pressure increase with speed or does it stay constant because the pump is pushing the water out as the flows in the intake?
 
B

blazeracer

New member
Motor Head said:
So Im guessing by reading that that I need 30-40 psi? Is that at max speed? Wouldn't the pressure increase with speed or does it stay constant because the pump is pushing the water out as the flows in the intake?
Click to expand...

From what I take away on the reading up is the reading is at max speed. If your sitting idle with the motor on it should be under a vaccum in the suction piece. Cruising at half throttle on plane will get you a zero reading in the suction piece, or a very low reading. It gets pressure on forward motion, like a ram air, but it's ram water. Picking up water with the shoe and shoving it up in there at 80mph will build your pressure. 30-40 psi is what you want feeding the impeller to keep it properly loaded while the motor is at full revs.
 
txliberator

txliberator

New member
I just realized those are the same link crazy.gif

Here is the other one w good pics and mcmaster PNs
http://www.performanceboats.com/jet-boats/58980-measuring-pump-pressure.html
 
txliberator

txliberator

New member
Just ordered all the fittings and hose to do mine, figured might as well while the pump is apart. Only cost $21.00 thru Mcmaster.  :smile17:
 
Patchman

Patchman

Administrator
Staff member
Seems to me, that would be the only way to really get your pump dialed in. Kind of like calculating power loss through an automatic trans. Kind of good to know. think.gif
 
txliberator

txliberator

New member
I was only going to do one tap as the guys in the know advised for lake boats but I know as soon as I start asking for advice and trying to get it dialed I'd hear, "It would be nice if you had both readings." So 2 it is! :wink:
 
Patchman

Patchman

Administrator
Staff member
Well if you just tap the top or bottom, you would only get half the story it seems. How would the shoe effect the top pressure reading.I'm sure it mite make some difference, but having both readings tells the whole story. I think it's like anything else, the boat that runs the fastest, the owner or crew chief knows everything about it. It's never just a guess, they have to have all the info. But for a lake slogger like most of us, it mite be overkill if one doesn't plan on going all the way. I really don't know jack about any of this first hand. Just been doing allot of reading here and there. :grin:
 
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