Push 155 Pump Cooling fitting size?

[JKMike]

Hey yaw,

For those of you who have a Push 155 setback pump or something similar, what size NPT cooling fittings did you drill and tap the pump for? I would like to go with 2 x 3/8" NPT to 1/2" barb fittings rather than 1/4" NPT, for increased flow, but they feel a little large. I was hoping to find someone who has successfully ran 3/8" fittings without running into problems.

 

[kevbo]

What engine do you have? I know that a 701 can survive on one 8mm or 5/16” ID line.

 

[mikesx]

Hey yaw,

For those of you who have a Push 155 setback pump or something similar, what size NPT cooling fittings did you drill and tap the pump for? I would like to go with 2 x 3/8" NPT to 1/2" barb fittings rather than 1/4" NPT, for increased flow, but they feel a little large. I was hoping to find someone who has successfully ran 3/8" fittings without running into problems.

Unless it’s made with bosses 3/8 NPT may be a little too big for tapping just the wall.

 

[JKMike]

What engine do you have? I know that a 701 can survive on one 8mm or 5/16” ID line.

I'm running a XS1060, Full Spectrum 50 Carbs and a PFP.

 

[JKMike]

Unless it’s made with bosses 3/8 NPT may be a little too big for tapping just the wall.

I wouldn't call them bosses but the pump does have a thicker section for installing fittings. It's 0.31" thick there.

 

[mikesx]

I wouldn't call them bosses but the pump does have a thicker section for installing fittings. It's 0.31" thick there.

3/8 NPT threads are .675 OD. As general rule of thumb I like to see what I’m tapping as thick as my OD. But this is jet ski stuff where general rules of thumb go out the window…..
I’d ask Push what they think about going that big.

 

[ridetrp]

1/4 npt 1/2 barb. Dint reinvent the wheel just keep it turning.


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[JetManiac]

1/4npt is fine

 

[JKMike]

1/4npt is fine

What if I plan on upgrading to a 1200 in the future?

Also, why would RRP use 1/2" tubing for the cooling lines running through the tray if there was no need to run anything larger than 3/8", which is the nominal ID of a 1/4" npt fitting per McMaster? Just to be clear I'm not implying you are wrong. I'm only asking out of curiosity.

 

[ridetrp]

What if I plan on upgrading to a 1200 in the future?

Also, why would RRP use 1/2" tubing for the cooling lines running through the tray if there was no need to run anything larger than 3/8", which is the nominal ID of a 1/4" npt fitting per McMaster? Just to be clear I'm not implying you are wrong. I'm only asking out of curiosity.

Won't matter. You ever see the amount cooling in an oem yamaha 1.8 liter. Your fine. And if you ran a 1200 you would use 2 or 3 and or 1 for engine only with a distribution block. 1/4 npt 1/2 barb your next post better be a picture of it installed. .


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[Wetbuffalo]

Kinda wild you have to drill and tap them yourself. I guess one less machining op.

 

[JetManiac]

Kinda wild you have to drill and tap them yourself. I guess one less machining op.

There are 3 locations on each side. You choose location which lines up best for your hull and install and npt size.
Also best to tap for the specific placement barb angle, so the tapered npt threads tighten right where you want it.

If all 6 were drilled and pretapped, then you would need 4 hole plugs installed and more uneven to water flow inside.

 

[Storbeck]

I kinda like that. Normally it seems like every aftermarket part doesn't really fit and you have to screw around making it fit. At least with this they made it easy. Better than a pre tapped home in the wrong place so you get to plug that and tap a hole in a spot that's not really designed to have a hole.

 

[JetManiac]

Just a quick measurement on the brass 1/4 npt to 1/2” barb fittings, the ID is almost the same on each side 0.36” and 0.38”.
The water flow is slowed down an insignificant amount travelling thru the 1/4npt part of the fitting. The 90 deg part is much more of a restriction and it doesnt matter either. Water will go through several more fittings and restrictions to motor, head, and pipe. The flow in 1/2” lines and fittings is still much greater than the 3/8 waterline and even smaller 3/8 fittings which are smaller ID yet and more restrictive to flow.