shakescreek
Veteran Member
- Joined
- Oct 14, 2005
- Location
- B.C. Canada
- TDI
- 18'6" welded aluminum jetboat with pd160, gtb2056vl, and tuning by rub87, 2003 chev blazer with bhw swap, 2000 jetta alh with gtd1752 vrk, .240 injectors, 11mm pump, fmic, 6 spd manual
"I would like to see how the coolant circuit works."
I have 2 aluminum pipes passing through the transom and welded in place, one above the other. The heat exchanger is clamped to the to pipes on the outside of the transom. If you go to the member area in the picture galleries and go to shakescreek and look at picture #9 of the rear of the boat you can see the heat exchanger if you look between the jet and the ex pipe towards the far side of the transom. It is the vertical pipe looking thing. Mine is homemade but you can buy commercial made ones. It is just a bundle of small tubes(mine are about 5/16ths) running longitudinally through a large aluminum pipe (think mine is 4"id). The coolant from the engine flows in the top of the large pipe, flows around the small tubes and out the bottom of the large pipe. The jet pump has two 3/4" nipples on the front of it to supply cooling water and one is connected to the bottom of the heat exchanger forcing cold river water through the tubes to cool the engine coolant. The other nipple feeds water to the intercooler and oil cooler. If you look at pic #7 you can see the expansion tank just to the left of the red plastic ecu cover on the inside of the transom. The coolant hoses are not connected to it in that picture as the boat is partially apart right now but the rear of the engine is about 1' from the transom so the coolant flows from the outlet at the back of the cyl. head to the expansion tank, through the ex tank into the top of the heat exchanger, out the bottom of the heat exchanger back through the transom to the inlet at the thermostat & water pump on the left front of the engine block. Hope I explained that clearly, any more questions just ask.
Laurie.
I have 2 aluminum pipes passing through the transom and welded in place, one above the other. The heat exchanger is clamped to the to pipes on the outside of the transom. If you go to the member area in the picture galleries and go to shakescreek and look at picture #9 of the rear of the boat you can see the heat exchanger if you look between the jet and the ex pipe towards the far side of the transom. It is the vertical pipe looking thing. Mine is homemade but you can buy commercial made ones. It is just a bundle of small tubes(mine are about 5/16ths) running longitudinally through a large aluminum pipe (think mine is 4"id). The coolant from the engine flows in the top of the large pipe, flows around the small tubes and out the bottom of the large pipe. The jet pump has two 3/4" nipples on the front of it to supply cooling water and one is connected to the bottom of the heat exchanger forcing cold river water through the tubes to cool the engine coolant. The other nipple feeds water to the intercooler and oil cooler. If you look at pic #7 you can see the expansion tank just to the left of the red plastic ecu cover on the inside of the transom. The coolant hoses are not connected to it in that picture as the boat is partially apart right now but the rear of the engine is about 1' from the transom so the coolant flows from the outlet at the back of the cyl. head to the expansion tank, through the ex tank into the top of the heat exchanger, out the bottom of the heat exchanger back through the transom to the inlet at the thermostat & water pump on the left front of the engine block. Hope I explained that clearly, any more questions just ask.
Laurie.