Heater

I am trying to put in a heater and can not get enough water flow off the engine drain plugs.    I purchased an auto heater core and mounted a fan on it.

Where is the water leaving your engine? The hose going to the inlet of the heater core should feed from the intake manifold.

As Don said, you can add a Y to water line right before the raw water pump, but this is only necessary if you are having trouble maintaining heat at idle. The suction of the raw water pump will help maintain flow at low RPM. I believe the location for stock heaters fed back into the drain in the bottom of the U-pipe.

Boat water temp may only be 150°, but in my experience they are plenty hot. If I keep my feet near the vents of my heater for long at all, they get uncomfortably hot. Remember, 150° water is scalding hot and copper heater cores are quite efficient, especially with the relatively low air flow in a two vent system.

Cooper

plumbed mine to the 1/4" npt port on the water pump, and the top of the intake, like ford did with their cars and trucks.

Plenty of heat any rpm.

I run mine out of the same hole as the t stat sender, that's as warm as it gets.   the hose looses a lot of heat on the way to the core so I wrapped it in pipe insulation from the back of the motor as far forward as I could get (v drive is a much longer run). That helped some and I'll go back and add some from where it comes through the floor to the core at some point.   An IR thermometer is very handy to tell whats hot and where it cools off.   I get about 100 degrees at the vent after 12ft of heater hose and 4ft of flex tube. Trapping the air is important otherwise your driving a convertable with the heater on low at best. We use fleece blankets that are nylon on one side, they work great with a hot tube underneath. When I drive I just stick a hot tube in my fleece pants by my ankle.

mjohn1988 wrote: I read some guy named bill used epoxy resin instead of polyester. It sounds like it worked. Any thoughts. I like epoxy much more than polyester. Any thoughts

You aren't doing enough searching and reading the great stringer job threads that are on the CCfan site.

The fan isn't made to be mounted in the bilge and I believe there is a warning sticker that says it's not ignition protected.    On the Barefoot / Excel I think you would loose more heat throug the long runs of dryer hose to the front if you could mount the core in the back.

The heater in my Vdrive is mounted behind the driver kick panel. Plenty of heat, even at idle

Mike