masher44

Getting some motor upgrades that include an intercooler.

I finally had my water pressure perfect without the intercooler but with the addition of the cooler I want to make sure my water supply to the motor doesnt drop.

Questions: If I just splice off a bleed line from the current water line will my pressure to the motor drop significantly?

Is a 2 stage pump set up the best? or something else?

Boat is a single engine with a 6 drive and want to avoid adding a second water pickup off the transom to feed the cooler. My current pick up is under the boat.

I have a high volume strainer in place with plenty of flow. Majority of my running will be close to wide open.

Thanks for any input.

MOBILEMERCMAN

There are many ways and opinions I'm sure. One simple way I used with success was to tee at a oil cooler use a #8 hose to intercooler and out. In the fitting at the tee I put a 5/16 washer. The dump went out the side visible from the helm. Had 23- 25 lbs at motor 8-10 lbs at intercooler. It had transom pick ups, strainers,went 95 mph in 31 Scarab.
Jim

BenPerfected

How did you change the water line rigging with the addition of the inter-cooler?

MOBILEMERCMAN

BenPerfected, Not sure who you were asking. Picture of that boat, oil line is SS the water line to inter-cooler blue push loc.
Jim

bob

What size hose do you have running from your pick-up to your strainer? My thought is that if you are running 1 3/4-2" into strainer should be ok. If not, you can put a pressure guage on the strainer and run it? That is sometimes interesting especially at speeds above 60 or so. If you have 20+ #'s or so then give it a try running of the strainer and re-check pressures.

masher44

Mine is a blower shop chiller... how will I be able to tell if I have enough water flow without blowing the cooler? Estimate by the amount of water pressure I lost to the engine (which sounds scary on many levels) or set it up with a gauge?

MOBILEMERCMAN

I have never seen a intake hose larger than 1 1/4''. Some things to keep in mind. 70 mph is 70lb of pressure, 100 mph is 144 lbs. The Super V's that first broke 140 mph had 1 1 1/4'' pick up feeding a catch can and that was enough water for 2 supercharged inter- cooled engines. We tried pressure gauges and found pressure spikes would explode the gauges almost immediately. In the end there was a # 8 hose dumping air and water off the top of that can. The pressure in the stainer doesn't matter the pressure in the engine block does. Engines like about 25 lbs inter-coolers like 10-15 lbs.
Jim

MOBILEMERCMAN

Run a gauge in the block you can read it a drain and a gauge on the outlet side of the cooler.

DMOORE

My intercoolers are pressure fed by thru hull fittings only. No need to tap into the cooling water for the engine. Also there is no water passing thru the intercooler at idle. this helps prevent fuel puddeling. On #8 line in, and 2, #8 dumps out. One dump is open, the other has a pressure release valve set at 15psi. Like mobilAmerican said, lots of different ways to do it.



Darrell.

masher44

Cool Thanks! My set up is with an 871 blower and we will make about 900hp.