candyman35

I'm curious if the step Hulls are running high numbers for Water Pressure. In the off season I fixed my sucking air into the system by installing dual water pickup Bravo X drives. My pressure doesn’t drop even in a hard corner. The problem is that I am pegging the water pressure gauge. I know this will create engine problems and I am franticly looking for a solution. My understanding is that the 502's were the worst offender of High water pressure. I'd like to see what kind of water pressures we are all running. I believe Inthered had a picture of his dash with the gauges pegged.

My current water pressure is 35lbs +
With the old drives and low water nose cones the top pressure was 35 port and 30 starboard which then dropped to 10 lbs. as the pickup came out of the water.

Thanks,
Dan

GATORONE

Dan,

At wide open throttle I have 25 lbs of water pressure and around 8 at idle

candyman35

GATORONE,
They obviously have those 575's dialed in.
Dan

SeaDated

Candyman

I'm with you ...35+

candyman35

Sea Dated,
Bruce suggested adding holes into the tailpipe section, which makes sense. I have one water hose going to each manifold.
Does your setup have one or two?
Dan

SeaDated

candyman

Only one hose to each manifold.

envision

I just got a new 29 with a 500 EFI/XZ. The Merc book says water pressure should be 20-30 lbs @ wot. I only get 13-15 lbs which is what the Fountain report says that they got. Pressure at idle is just barely visible.

If that helps.

candyman35

Thanks for the responses so far. As long as there is volume 10-15 lbs. is good. Marty, at Fountain, likes to set up the race boats with 18- 25 lbs.
I'd like to hear from some of the other 502 and 454 owners. The 500’s don’t seem to have this problem. The are only two causes I can see for high water pressure in a normally operating engine. Sea Dated and myself have the thermostat housing with only one hose going to each exhaust manifold and that might be the restriction or the exhaust manifold it’s self is the restriction.

I new I should have bought the HP500's.

Dan

SeaDated

Candyman

Me too. I went to get a 32 with 500's and then I found another one with better looking graphics, to me anyway. I wished I had the 500's now. Drats!

Jana

My 29 w/HP500 (carb) is about the same as envision's. Nothing to just a tick at idle, around 15 at WOT. Drive does not have the low water pickup arrangement.