Drilling a water jacket

[dasboata]

The water fitting on water jackets should be 180* apart,, why do the manufactors put them where they do looks around 45-50* ?

[runzwithsizorz]

Are you trying to say that it might be better if the inlets were on the very bottom, and the outlets on the very top? Frankly I don't think it would make any difference cuz,---
once the chamber is filled

[Fluid]

Chris is right, the best cooling efficiency would be with the fittings 180 apart. No one makes these probably because the lower fitting would require the motor to be raised above the hull bottom too much. A good compromise would be 120 degrees apart.


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[flraptor07]

Dave @ HRC puts his 90deg., I know he has done a lot of testing so you might want to get ahold of him and see what his thoughts are.

[kfxguy]

I wish they offered them where we could drill our own holes. I find myself having to route the cooling hoses in a funky manner vs nice and neat like I'd prefer. I've made a couple of my own and I've also filled the hole with jb weld, skim it in my lathe and move the hole.

[ray schrauwen]

You can always drill your own if you have a drill press and taps. Just fill in the unused hole with a set screw and 603 loctite.

Been there done that to make mirror image coolers for a twin cat. Now a twin cat is where it's a real pita to get coolers with outlets where you need them.

[dasboata]

Chris is right, the best cooling efficiency would be with the fittings 180 apart. No one makes these probably because the lower fitting would require the motor to be raised above the hull bottom too much. A good compromise would be 120 degrees apart.


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I was thinking you can always put the lower fitting in back of the motor where there is more clearence. I also like the Idea or drilling and tapping them myself , K & B make some nice 90* fitting as does Aeromarine !

[ray schrauwen]

I don't think you should put a nipple on the bottom at back, you might not get much cooling on the top of the motor case at the back of the motor.