2 Questions-Speedo pressure/hand hole o-ring size

[PC Rat]

What size is the o-ring for the cleanout on an Aggressor pump?
How much pressure is in the speedometer hose?
Brian

[IMPATIENT 1]

most tractor dealerships will have the orings, they have every size to do hyd. rams and such.i've gotten alot of different handhole sizes from local john deere dealership.
there's enough pressure in my speedo hose at 75mph to spring a mysterious leak on my leg and scare the hell outta me every once and awhile,lol.

[Duane HTP]

Here is a pressure to speed conversion chart.
http://www.hi-techperformance.com/images/Speed_Chart.jpg
Really makes you stop and think about something hanging down below the bottom of your boat, doesn't it?

[Old Guy]

From Teleflex about 30 years ago.
MPH = PSI
20 = 5.3
25 = 7.46
30 = 10.9
35 = 14.8
40 = 19.36
45 = 24.5
50 = 30.25
60 = 43.56

[PC Rat]

Really makes you stop and think about something hanging down below the bottom of your boat, doesn't it?
A few years ago I had the bolt (5/16" I think) that goes through the ride plate and saddle begin to work it's way out while driving my boat. Once the bolt got about 1/2 way out, it bent almost 90 degrees and wedged itself tight and I noticed it stuck in there when I took the boat out of the water.
The top speed was in the low 90s.

[miketsouth]

Here is a pressure to speed conversion chart.
Really makes you stop and think about something hanging down below the bottom of your boat, doesn't it?
makes me think i been doing calculations and looking for this chart for eons and you had it all the time.
Reverse engineering this chart maybe will give me nozzle pressure to run water around the intake so's i can see what the intake is doing with the water at that speed.
the data here matches a graph that i found here (http://www.tinaja.com/glib/muse92.pdf)
funny the match point is about 70mph~70psi i got some little dots on my speedo at just this point. Two of them...seperated by a few MPH...maybe one for salt water, or maybe one for a different pitot.
much appreciated, thanks Duane.

[Duane HTP]

Miketsouth If you want to get technecal, the formula is;
Speed = 8.31 x sqrt.( psi ).
Maybe that will help you with your calculations.