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67rway

Heater Y-pipe install

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67rway

A couple of months ago(back you know where), I posed a question about whether to plumb the heater y-pipe before or after the pump. Heatercraft says before, while Malibu installs them after. As a point of interest, 2 months have passed without an answer from Malibu as to why they do it after...

I ultimately installed mine before the pump and have since done a non-scientific comparison between mine and my buddies that was factory installed after the pump. Here are the results:

My '05 RLX with Y-pipe before the pump running down a 50 degree river on a 45 degree morning put out 121 degrees, and 118 degrees after about 1 minute of idle.

My buddies '05 RLXi with Y-pipe after the pump running down a 50 degree river on a 45 degree morning put out 116 degrees, and 108 after about 1 minute of idle.

Not earthshaking, but enough to prompt those doing new plumbing to follow Heatercrafts guidance.

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John I.

On a 45 degree morning with 50 degree water, I'd say 5-10 degrees of extra heat is pretty significant!

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BarefootOz

67rway,

Can you post some pics of both installations?... :)

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WakeGirl

Things that make you go hmmmmm....and contemplate moving the y-pipe. :)

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onamission

I moved the pipe to before the pump on my 05 RLXi after the first time out, my friend across the lake still has his after the pump on his 05 RLXi. I have two 2 vent heaters and he has one 3 vent heater, I didn't check the temp but I do believe that I kick out more heat then he does. In my opinion the factory puts it after the pump because that line is easy to cut with out having a wire in it and thats where you would also get the water for the cold side of the shower.

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mrothwell
On a 45 degree morning with 50 degree water, I'd say 5-10 degrees of extra heat is pretty significant!

I'm thinking that I would bump my 160 degree thermostat up to a 180 degree thermostat in those conditions - We used to do that on my buddies MC every winter when we were skiing, it made a huge difference to the heater output.

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smooth as glass

I actually thought of doing that as well Mwell, is that ok to do with the monsoon?

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mrothwell

I would check with Indmar first, but we did it with no problems on his 91 ps190. It had the 351 ford/indmar in it. Now, with everything being computerized, I dont know what a temp change of 20 degrees would do, but I would think that it should still be in range.

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UWSkier

With how prone the current Indmars can be to vapor locking, I'd be sure to put the 160 back in for summer use. No sense introducing extra heat to the mix.

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mrothwell

Even with his carb'd MC - we put the 160 back in for summer.

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