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  #1  
Old 10-23-2007, 12:30 PM
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ttu ttu is offline
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heater

this is my 1st inboard with a heater. 07 x2.

is it me or does the thing not put out much heat and does not seem to blow very hard.

any ideas.
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  #2  
Old 10-23-2007, 12:33 PM
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is it blowing hot air? If not, one of two things. Have you tried at at a speed other than idle? Is the input valve to the heater core open (similar to a garden hose turn on)?
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Old 10-23-2007, 12:55 PM
bigmac bigmac is offline
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They're notorious for not putting out much heat, especially at idle. The solution is to add a Y-pipe, which will change the return line from the circulating pump where it is now to upstream of raw water pump. Pretty easy install. Works very, very well. Y-pipe from SkiDim...

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Old 10-23-2007, 12:59 PM
88 PS190 88 PS190 is offline
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The Y pipe is basically a siphon pump, and will suck water from the heater back into the system under a vaccume.

It does fix the problem by putting suction on the back side instead of just relying on the slight pressure on the front.
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Old 10-23-2007, 01:22 PM
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you can feel some heat from the vent by the driver but the 2 tubes located behind the driver there is hardly nothing.
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Old 10-23-2007, 01:45 PM
88 PS190 88 PS190 is offline
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2 part solution, increase flow of hot water to heater core, increase fan power.

This is why it works best to build your own in some cases. The fans from the normal type is basically a blower. If you got one of those hamster cage type blowers mounted to the box you would have a ton of air flow.

All these boats use heatercraft or whatever heaters... which are not great.
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  #7  
Old 10-23-2007, 01:49 PM
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I have an 06' 197 with the 200H Heatercraft. I've ben researching my lack of flow and heat as well. It doesn't put out much airflow to the kickpanel vent on the drivers side. The hot tube under the passenger seat has pretty good flow. I've looked at it and I'm pretty convinced the airflow issue to the kickpanel is because of the awkwardly routed ducting. The ducting to the hot tube is a straight shot. I was gonna tackle the kickpanel's weak flow by re-routing or straightening the duct. It's also interesting that the 200H has a 3 speed fan (172,228, and 263cfm), yet Mastercraft's switch is a 2 position switch. I'm wondering if they utilize the 228/263 combo or perhaps the 172/228 combo. I note little difference between the 2 fan speeds, so I wasn't too convinced they used the 172/263 combo.

I've also noticed that the airflow is just not very hot. Realistically, the most important time I want heat is after I get out of the water in the fall - and at that moment - the boat is idling at 660rpm.

According to Heatercraft, until the engine is turning 1100-1600rpm, there simply isn't much (or any) flow to the heatercore, hence the low output of heat.

One solution is to mount the H415 circulating pump/switch. (about $100-140 on ebay typically) This will circulate water to the core when you are sitting there at idle, increasing your heat output when you want it most. The other is the "Y" from Ski_dim. The "Y" is much cheaper. The "Y" is also available from Heatercraft. Take note of the description...and then compare that to the Mastercraft factory install and note the lack of the "Y" hmmmm....

http://www.heatercraft.com/ProductIn...productid=H424

Ultimately I would probably replace my 200H with the 300H, which has a much more substantial motor combo along with higher output.

Does anyone have pics of where exactly to install that "Y"?

Jerry
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Old 10-23-2007, 03:59 PM
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Thermodynamically speaking, I don't understand how increasing air flow increases heat output if the water in the core isn't hot.

IMHO, a bigger fan and a bigger heat exchanger won't do a thing unless the water circulation is changed to allow the water in the heater core to be hot enough. You can get only so much heat out of a lukewarm heat exchanger, and increasing airflow won't help it.

As to decreased airflow from the kick panel...be aware that those louvers will open and close, and that vent is notorious for closing itself and decreasing airflow through that vent - an oft-reported problem here. I spent time trying to track down that very problem on my boat, including trying to evaluate the routing of the vent hose. I solved the problem short term with a zip tie (securing the "self-closing vent" open) and definitively solved it by replacing that kick-panel vent with a hot tube.
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Old 10-23-2007, 04:22 PM
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wich engine ?.it seems the LY6 have more problems with the heater..i,m trying to find an alternative route for waterflow,sofar no luck.
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Old 10-23-2007, 04:42 PM
VTJC VTJC is offline
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Quote:
Originally Posted by JerryS
Does anyone have pics of where exactly to install that "Y"?
The Y-pipe is installed on the inlet side of the RAW Water pump. It makes a substantial difference, particularly at idle.

Jamie
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