Heat exchanger

Postby Tony wynhoven » Mon Mar 06, 2017 7:16 pm

Hi all, I am very new to this page and ski/wake boats for that matter...
We have a retro 1980's ski boat with a tunnel rammed mildly hot 396 bb chev with jet drive . Just wondering what heat exchangers people are using and where to get one?? We have just had the motor built and am keen to run coolant instead of muddy water :)
Any advice would be appreciated
Thanks
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Re: Heat exchanger

Postby 82Juddcraft » Tue Mar 07, 2017 5:36 am

Welcome Tony,
I wanted to do the same as u, early 80s hull and cleaned up a 400 sbc and wanted to run coolant and a thermostat.
I picked up a oil/water heat exchanger like what u'd find on a truck and retro fit a expansion bottle and ran a standard Chev thermostat housing.
I got a 3/4" fynspray pump for the river water and a Chev short pump for coolant.
But since u have a jet u probably only need a pump on the block for coolant.
I dropped into a radiator joint last weekend to suss out hoses so I'm hoping to have it plumbed up in the next month or 2.
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Re: Heat exchanger

Postby mof » Tue Mar 07, 2017 8:04 am

20mm inside , 40mm out side , raw water and cooling water run opposite directions ,
1mtr per 100hp is heaps..
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Re: Heat exchanger

Postby 82Juddcraft » Tue Mar 07, 2017 9:58 am

U can have my second one for $200 but it needs someone to TIG the end of the tubes at the bottom there.
Looks like someone screwed a fitting in to far and crushed the ends.
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Re: Heat exchanger

Postby Tony wynhoven » Tue Mar 07, 2017 3:58 pm

Hi guys
Thanks for the replies. We have found a Cummings one off I 8.2 lyre turbo diesel marine motor. Should do the job with some modifications.. I think the jet drive should have enough pump to get water thru the exchanger. Thanks for all the ideas
Cheers Tony
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