transom pickup or drive
 

putting in blown 557s was wondering will the pickups in the drive supply enough water or do i need transom pickups, adding innercoolers so i know i will need to add a pickup for those, just not wanting four pickups hangin off the back. ive been told both ways will work just asking what you guys think,.

Re: transom pickup or drive
 

What he said.
I've wondered about this as well.

Re: transom pickup or drive
 

lets try again?

Re: transom pickup or drive
 

use the pickup's from the drives to supply the intercoolers. use small intercooler strainer's in line of course. then use niceexternal adjustable pick up off the transom for the sea water system entering the engine. again using a strainer.

Re: transom pickup or drive
 

What he said.

Re: transom pickup or drive
 

im going to run with the orig plan , motors off the drives, innercoolers from pickups w/strainers. my other motors were blown also but no innercooled, and less cubic inches

Re: transom pickup or drive
 

I have some picks ups for sale in the swap section

Re: transom pickup or drive
 

Why would you go that way ?more or less volume?

Thanks
Rob

Re: transom pickup or drive
 

using an adjustible pickup off the transom, you can regulate for too much water pressure easier than thru the drive, that is if using a l.w.p lower or a sportmaster lower.

lets say you have too much pressure because the boat is now going a few mph faster, with the adjustable pick up you can compensate. of course including factors such as dumps and water system capacity(single or dual stage pump, 1 1/4 hose, stariner capacity). to high raise the pickup.
also chances are with a transom mounted pick up for the intercooler you may make too much pressure and harm the intercooler itself.
i've tryed it both ways, and it does work both ways. but considering experience of the installer may not be on the professional level the above stated way is a LITTLE less likely to back fire.

just mt 2 cents . Bo.

Re: transom pickup or drive
 

Thanks of the info. Bo have you seen any probs with too much pres in the innercooler and seen any damage?

I was told the PFM are good to 40psi and the Whipples is good to 100psi.

Rob

Re: transom pickup or drive
 

yes actually twice. once from not using large enough dumps. the other was from using an imco lower the way i described earlier. the imcos make big time water pressure, which makes it necessary ro go the long but correct route of using a strainer, a pop off valve and correct size dumps, that dump ove board and not into the exhaust.

Re: transom pickup or drive
 

If the Imco picks up so much water. wouldnt that mean if you could make the opening on the Imco smaller that it would be faster?Like a pick up hanging down too far getting to much water???

Rob

Re: transom pickup or drive
 

What about southbay strainers. I've had good luck with them. Especially when I use a big one , and use the 1 1/2" thru hull fitting. My friend has a pair of 588 na's that run cool. Out here in the GSB, we are plagued with seaweed. With these, I never even see a piece of grass in the inside basket strainer. I've seen problems with the transom mounted units.
Is the problem with the S.B.S , that it may pick up air if very little of the boat is in water at high speed(usually mounted 3' foward from transom ) ? or is it a drag factor ? or does its installation(even correctly done ) cause a pocket, or disrupt the water pattern to the prop ? F* getting water from a drive. First, it's shallow waterways here and the drive will fill a motor with sand, and muck, second the hose in the trans. assy is only 5/8" , third , salt water passing through the drive is a severe corrosion issue. So if I ever come across a low water p/u drive I'll sell it to someone who lives in a freshwater area, because I'll have no need for it. BBB

Re: transom pickup or drive
 

NO. your not changing the hydro-dynamic's of the lower, just diminishing the amount of water entering the drive. this will lower the overall pressure, and in some instances we have machined the cases to except a s.s grating for 2 purpose's
1 to lower pressure 2 to keep Deb to a minimum.
the adjustable pick up( or permanent style if you have the patience to keep cutting until you achieve the correct balance)helps by adjusting height to lower or raise pressure as well to not hang down too much to create too much drag.

Re: transom pickup or drive
 

south bay stariners are for searays
on any boat that runs any kind oy significant speed, they will cause all three of the problems you stated earlier.
as far as the drive, how many of the bravo boats you see out on the waters , or at mloey malones , fire island ,use the drive as primary inlet for water or as the way i stated earlier.
i would sa y atleast 5000 at any given time. the eel grass happens to bite but on any speed boat the correct way is to use the method stated above.