Show Posts
31
CB750 / Re: Head Bolts
« on: January 20, 2024, 10:54:02 PM »
Typically mc fuel pumps delivers 3psi. Float valves are generally overcome at approx 4.5 / 5psi. 1ft head of water gives 0.433psi do the maths.
One thing many don't think of is that in use float valves open very tiny amounts so the smallest of debris is likely to stay in the valve and never
be flushed through unless the carb is drained or stripped and cleaned properly.
Anyone wanting to check simply put a airline with a pressure reg on a upside down carb on the carb inlet and see at what point the valve leaks
air when using leak detector spray.
Isn't that accumulated figure 0.433 psi going downward under sea level ? Usually at one atmosphere for each 10.06 mtrs (33ft) effectively the accumulation of the ocean above you.
In air, and by lifting 1 ltr, then its nothing like that surely.
I'd doubt much difference between a tank say at 20 ltr sitting just above the carbs, in comparison to 1 ltr at 6 ft higher.
No just as a column of water lift the tank 10 ft and you will have 0.433 psi X 10 = 4.33psi at the pipe end. Volume in the tank is irrelevant.
A quick Google
What is the pressure exerted by a 1 foot column of water equal to?
Using Water as a Guide for Determining Pressure – Math for ...
0.433 psi
The relationship between water, height and pressure is constant. If we were to take a column of water 1 foot high and use a pressure gauge at the bottom to measure the pressure it would read 0.433 psi. This is our constant when dealing with water and it remains consistent as we add more water.
