09-06-2012, 10:20 AM #1
has anyone dual cooling lines in his openloop system
hi, i was wondering if anybody has dual cooling line on a 4 tec with openloop by tapping into the pump and put a cooling hose true the transom. i know a german guy does it on his cc race boat but was wondering if anybody else does it.
i must mention it's for a race boat and not for a rec boat. i know the riva kit runs great on rec boats but are there any real high performace boats that runs a different setup??
it's not the bleu hoses i'm talking about but the big black one.
09-06-2012, 08:17 PM #2
They do that on the yamaha pump setups on the gprxps which is basically what you have here. If you go to the conversion section you can see the different variations of dual water routings that people have posted.
09-06-2012, 08:40 PM #3
Do you run a open loop in real cold water?
That black hose is taped into the same water feed just before the restrictor washer
IMO seems easier just to remove the restrictor and T the hose inside the boat for more than enough flow
with no extra holes on the hull/shoe
09-06-2012, 10:16 PM #4
- Join Date
- May 2007
- Auckland, New Zealand, New Zealand
09-07-2012, 07:09 AM #5
09-07-2012, 07:45 AM #6
I run a 20 plate heat exchanger in 80f water and temp never goes above 160 with the 160f t-stat at wot
for long idle times it may get near 170
my point is keeping the whole motor up to temp and at a constent temp is better for tuning and motor life
on a 160f motor 50f water entering the block has to create cold spots
my point is why pump crap (raw water) threw your motor when there is a much better option
and another good thing with the closed loop, you can see if the motor is using/leaking coolant
the total extra weight (not much) is IMO worth every pound
09-07-2012, 08:17 AM #7
09-07-2012, 09:05 AM #8
i want to run 2 hoses 1 for the exhaust system and 1 for the intercooler+motor to keep my exhaust as cool as possible. but i don't know if it will make a big difference if i run a extra line that doesn't go true the intercooler first but comes directly from the pump
09-07-2012, 09:46 AM #9
what size/color restrictor washer are you using?
water flow is all about restrictions
the water will go where there is the least restrictions
when I split my flow I used a X T because it has a built in restrictor
also if you use a strainer it is also a big flow restrictor
09-07-2012, 10:05 AM #10
i have a strainer and i use a yellow restrictor
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