How many GPM does a Bravo water pump flow?
02-18-2003, 08:27 PM
#1
Registered
Thread Starter
How many GPM does a Bravo water pump flow?
Yes I know there are a lot of variables but approximately how many GPM would a Bravo water pump flow out the exhaust at various RPM? Needing this info to size some bypass and check valves. New design in the works. Just ballpark figures at this point, the valves will have a range to work within.
Tim T.
Tim T.
02-18-2003, 09:45 PM
#2
Official OSO boat whore
Charter MemberJoin Date: Oct 2000
Location: Mequon, WI
Posts: 6,157
Likes: 0
Received 0 Likes
on
0 Posts
I researched this extensivly some time ago. The result? Nobody really knows. The best that I could come up with was around 30gpm at full song. Honestly, that was based off of some loose calculations and is really a wild ass guess.
02-19-2003, 06:09 AM
#3
Registered
It depends on RPM, speed, and inlet type. Remember it is a floppy vane so the more inlet pressure supporting the back of the vanes, the more output flow potential before the vanes bend and "cavitate". It could be more than 40 GPM depending on those variables.
02-19-2003, 06:48 PM
#4
Toxic FORMULA
Platinum Member
I too , did some research last year. The results...Jabscos "Merc replacement " pump is 22 gpm at 2000 rpm. Beyond 2000 the impeller pretty much acts like a blender and just mixes stuff up and the water is forced though by your forward speed.
I don't Imagine the Merc is much different
I don't Imagine the Merc is much different
02-19-2003, 07:18 PM
#5
Registered
Join Date: Jun 2001
Location: Michigan
Posts: 3,345
Likes: 0
Received 0 Likes
on
0 Posts
unless you are going to design something into the system using thermodynamics, flows, heat transfer, energy, chemical equilibrium...yada,yada, yada...mopower looks like he has some data for ya.
heat transfer, and GPM is not our issue....actually most of the time we have too much,,,,which translates into wasted HP...just a little tip.....ANY more flow or pressure than you need is wasted,,,,well at least in our eyes
..... energy can not be created or destroyed...but what do i know?
heat transfer, and GPM is not our issue....actually most of the time we have too much,,,,which translates into wasted HP...just a little tip.....ANY more flow or pressure than you need is wasted,,,,well at least in our eyes
..... energy can not be created or destroyed...but what do i know?
02-19-2003, 07:26 PM
#6
Registered
Join Date: Jun 2001
Location: Michigan
Posts: 3,345
Likes: 0
Received 0 Likes
on
0 Posts
there is some prettttay smart M-F'ers that lurk in these here threads!!!!...me and my other brother daryl are not one of 'em!
in short,,,, acutally you can only flow so much through a given orifice.
in short,,,, acutally you can only flow so much through a given orifice.
02-19-2003, 08:06 PM
#7
Registered
Thread Starter
Yes, that is a given. We are shooting for flow in a system that will have no more than 25 to 30 psi block pressure at WOT. This would requrie the given restriction to not be to small and create excess pressure. If the restriction were large PSI would be low and flow high and vice versa. The question then becomes (with exhast header being the restriction) how many gallons will you flow at 25 psi?
02-19-2003, 08:33 PM
#10
Ginger or Mary Ann?
Charter Member
15-18lbs @wot
__________________
Some people are like Slinkies - Not really good for anything, but they
bring a smile to your face when pushed down the stairs.
Some people are like Slinkies - Not really good for anything, but they
bring a smile to your face when pushed down the stairs.
