Water pickup for intercooler
 

So I have a baja h2x... installing water pickup thru hull... where is best placement for it.. I know off center.. but wasnt sure how far off of centerline and how far off back of boat... just didnt know best place for this... any help would be appreciated

What is it for ?

Raw water pickup for the intercooler on a carb 1471 blower setup... using pickup in drive to go to one sea strainer then to raw water pump to feed engine.. then gonna go with a thru hull pickup to another sea strainer to intercooler... so trying to figure out best location to drill pickup

You can accomplish the same thing with a two stage sea pump without drilling holes in your boat, Ive been running my Whipple set up this way for four yrs. 1471 in a h2x do you have a death wish........:angry-smiley-038:

I have a 2 stage water pump... but i have been told by countless people you don't want to run water to intercooler all the time on a carb setup as at idle and such you will get fuel pooling due to the cooler temps of the water going through intercooler... to my understanding you don't have that issue on fuel injection style due to fuel getting introduced under the intercooler

Well, I dont have an answer where to drill the hole, I do know with low water pickups it can be a challenge to get pressures sorted out, you might want to post this in the Baja section also good luck

Port injection is below the cooler but the batch fire type are not, the injectors are in the rear below the air intake, then the air and fuel is compressed through the cooler,

Which thru hull pickup are you using? Most require mounting roughly 1/4" below your transom. Some are adjustable so you can cut the hole then adjust with a couple of screws, but imo more things to go wrong

I would have to measure but mine is mount roughly 10" stbd of the end of my pad on my scarab. I'll also be adding a thru hull pickup on my tunnel hull soon

Depending on the waters you're on and how you drive you will also want a pressure relief after the oil cooler and before the engine, set between 20-25psi

I bought it from cp performance... it is the one that has the plate for four screws on inside then the stainless tube sticks down and you trim it once installed... and yeah I plan on having a pressure relief... wouldn't you just t the pressure relief straight off the sea strainer... as I plan on going just from pickup to sea strainer to intercooler and have two dumps for the back of intercooler...

which direction will your prop be spinning,ccw or cw?

would be rh rotation... so clockwise

I'd put the pick up no more than 6" from the bottom of the v on the port side.keep the pick up tube's diameter about 1/2 of it below the boat.then cut a v groove into the bottom of the boat.that should keep the water disturbance to the prop to a minimum.

Whenever possible we avoid running a second stage for the intercooler. Causes more problems than it solves. A Teague adjustable water pickup will be your best friend.
Sometimes, we even run an external for the engine and use the drive for the intercooler.
In cases where its unavoidable, we do run 2 or even 3 stage pumps, but your Baja will do just fine. Start with it 3/4 below the bottom.

What's your experience with bottom mounted vs transom mounted pickup for engines? I've always done transom but it gets crowded back there and bottom mounted always seems tempting
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https://cimg7.ibsrv.net/gimg/www.off...c9e4453f51.jpg

Wish I had better pics of it handy but mine is the square tube next to the trim tab under the steering ram. I wasn't a fan of any of the store bought ones so I made this one out of 1 1/2" square stainless. I tapered the bottom so the transom side was above flush and tapered the other end down to sort of a scoop shape if that makes sense. It is roughly 1/2-3/4 below flush on the outside edge and I did a plate on top to connect to the transom and I did a pipe through and a -16 an fitting welded on the inside. I run it direct to the IC. I originally had one -12 an dump and on the first drive I realized I screwed up as at 25 mph my pressure skyrocketed. I now have two -12 an dumps off the IC and at WOT the pressure sits right at 15-18 psi with no pressure relief valve. I was concerned of the relief sticking at some point and didn't want one more thing to worry about so I sized the dumps to not have to worry about it. As far as how far off centerline...I would have to put a tape on it but I figured out inside of the boat where I needed it to come through and then angled it outward until the square was the same as the rise of the transom. I believe the top is probably 24-30ish off center and the bottom is a few inches more than that. Hope all of this makes sense...little tough to put into words without better pics lol...I'll see if I have a better one straight on from the back

https://cimg0.ibsrv.net/gimg/www.off...cec43670da.jpg

Found one.

When I installed the pickups for my inter-coolers, I made a cutting tool so I had a consistent gap around the tube. It was not 90 degrees so took a bit of work.
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BBYSTY,

Could you have just restricted the flow at the pickup? We use a similar approach in our model boats, with the cooling water pickup in the rudder blade. For my 3.5cc boat, for example, there is a Ø.040" hole in the face of the rudder blade, and I use a ziptie on the hose connected to the outlet nipple on top of the rudder blade, restricting flow. I am amazed at how much water that Ø.040" hole puts through the system. Some have even gone to the point of putting a needle valve in line, so they can adjust it with a flow meter to account for ambient water temps. This is done to keep from over cooling the engine, but it would work the same for this application as well, in controlling pressure. Obviously, more than a zip tie would be required, but I could see an orifice "pill" used to accomplish the same thing. Or, as Saris mentioned, adjusting the depth of the pickup? As an alternative to multiple dumps? Just wondering....

Thanks. Brad.

Not a fan of bottom mounted especially on a balsa cored boat. Skater used to do them and now doesnt as well. Too many delam issues.

If the second dump didn't work then that was my next option but with it the pressure is absolutely perfect. I have the blower shop chiller so there was already a port was just a matter of making a second water dump for the transom. You can see the ones I made on there right above the steering hoses...the big hole is for the IC and the small holes are intake manifold dumps. Didn't want a bunch of different dumps so made them the same so it looks a little more uniform...just my OCD talking hahaha

But yes what you're saying would work but I knew I had X amount of flow available and figured if I could get it done with the same amount IE another dump then it's that much more flow running through the IC which will keep it cooler longer...at least in my mind it works that way hahaha

BBYSTWY,

And there is the difference, I guess. In our model boat application, we were intentionally restricting FLOW, to increase head temps, as even those tiny holes cooled the head TOO much, and you're trying to not burst an IC. I guess we can never cool an interCOOLER too much, can we?

Carry on.... :ernaehrung004:

Thanks. Brad.

Roger, I figured there was a reason why they werent popular. I'll stick to the tried and true transom mounts

Nice install. I also have a rectangular one in almost the exact same spot. Works nicely

So is your water coming from the outdrive or from a pick up tube? Do you have a pic of the plumbing?

Water comes through the Imco lower unit, -20 hose from transom to the strainer then -20 feed to the 2 stage pump then -16 to the engine and a -12 to the intercooler then out of the cooler to a transom dump

EDIT: kind of hard to see 2 stage pump is below the filter head


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Idle is definitely better with a seperate pickup. On a MOAC it`s a must

No denying this chap is Canadian...lol.

I`ve always used a hole saw, what is the point of this?

[QUOTE=F-2 Speedy;4932724]Water comes through the Imco lower unit, -20 hose from transom to the strainer then -20 feed to the 2 stage pump then -16 to the engine and a -12 to the intercooler then out of the cooler to a transom dump

EDIT: kind of hard to see 2 stage pump is below the filter head

Thank you. I waa debating of running 2 separate lines 1 from the transom pickup to raw water strainer to 2 stage water pump to closed cooling 700sci and the other from outdrive to 2 stage pump to sand strainer then to intercooler OR putting it all through 1 line from the raw water strainer? If that makes sense.

But if yours cools fine coming from only the outdrive to a 2 stage pump then to sand strainer and intercooler .... then i think I should be ok.

Reread my post, mine is from transom to the strainer then to the pump...........:ernaehrung004:

My mistake. I thought you mentioned yours is from imco lower thru -20 hose to pump...

You can always rely on Dan...he's got archived pics on standby.

How did you find the flow differences for next down level adjustment? Was it on the fence or just way too much water? Pop-off valve always open....!!

Ya I said imco lower but that feeds the hose hooked to the inner transom assembly..........

On the cig I actually ended up cutting the bottom of the pick up more 'straight' instead of the big scoop.. the scoop really pack in the water even when just a bit showing below the hull.

On Bad Kitty I got rid of some useless trans temp gauges and replaced with intercooler water pressure.

Used this strainer.. last engines they were mounted on the head which is even nicer but I don`t have any room on the new ones.

https://cimg8.ibsrv.net/gimg/www.off...3a7bd9e9b8.jpg
https://cimg1.ibsrv.net/gimg/www.off...2bfc05b276.jpg

On the cig I actually ended up cutting the bottom of the pick up more 'straight' instead of the big scoop.. the scoop really pack in the water even when just a bit showing below the hull.

On Bad Kitty I got rid of some useless trans temp gauges and replaced with intercooler water pressure.

Used this strainer.. last engines they were mounted on the head which is even nicer but I don`t have any room on the new ones.

https://cimg8.ibsrv.net/gimg/www.off...3a7bd9e9b8.jpg
https://cimg1.ibsrv.net/gimg/www.off...2bfc05b276.jpg

The reason I made the angle cutter was to achieve a consistent gap around to pickup tube for the 3M adhesive. I first cut an oversize hole with a hole saw then filled it with fiber reinforced epoxy, then machined it to accept the pickup tube and adhesive. Overkill I know, but I can't help it.