Anyone still using electric coolant pumps?

[joe_db]

I have been staring at my collection of FWC stuff and thinking about giving it another go. Included in the pile is two electric pumps.
Is anyone still using electric pumps? If so, what kind?

[Dave Neptune]

Joe, a bit surprised with this post as you are also trying to get more charging capability.

Check out some of the automotive after market hot rod suppliers like Summit Racing, Jegs etc. They have many inline pumps available and most should be good quality. They even have some that are engine specific that mount just like the crank driven pumps.

Dave Neptune

[ndutton]

I'm pumping electrically, 2 - Johnson CM30P7-1 pumps in series. They have no problem pumping through the engine, the new MMI dual action thermostat, the HX and a long loop up to the V berth mounted water heater and back. 5/8" hose everywhere except from the pumps to the engine side plate, that one is 3/4". I also enlarged the sideplate Tee from 3/8" NPT to 1/2" including the diverter cap inside the plate. When choosing a pump, be sure to watch the operating temperature range + a decent overage (margin of safety).

Dave's comment is interesting though. If you're trying to maximize your charging potential, why are you adding load that can be otherwise done mechanically? It speaks to my engine driven refrigeration compressor comment in the other thread too.

[sastanley]

When I sold my boat, I was still on the original Johnson CM30P7-1 pump. That was the single best thing I ever did to that motor, and that particular pump required zero maintenance and never gave me a lick of trouble. The draw was just a couple amps..I think I had a 3amp inline fuse, and ran it right in the ignition circuit.

I copy-catted what Neil did since my pump was the same 3/4" out and 5/8" in, except I wasn't heating any water. Adding hot pressure water was the next project if someone did not hand me a check, but my system would have been simpler than Neil's.

Anyway, I never had any trouble with that system except I had an undersized HX originally, but I was able to upsize to a unit that actually fit in the engine area better from Josh at Anchors & Oars marine salvage over there near you in Grasonville.

I originally had some garbage ebay backup pump, and ultimately decided that a few select pieces of hoses would allow me to either use the mech pump and switch back to RWC, or if that failed, a different hose route would use the electric pump to switch to RWC to get home, then rebuild at the dock and access to the shop. Hose and hose clamps are relatively easy in the field compared to rebuilding pumps.

[hanleyclifford]

I guess it comes down to an engineering question. How many amps does it take to drive the electric pump? How much horsepower does it take to drive the mechanical pump? Knowing the relationship of 25 amps to 1 hp our qualified engineers can figure it out.

[joe_db]

Originally Posted by Dave Neptune

Joe, a bit surprised with this post as you are also trying to get more charging capability.

Check out some of the automotive after market hot rod suppliers like Summit Racing, Jegs etc. They have many inline pumps available and most should be good quality. They even have some that are engine specific that mount just like the crank driven pumps.

Dave Neptune

If I do the big alternator on the front that takes the spot my mechanical pump will go.
Speaking of that, I need to do a test fit of the mechanical FWC pump and see if I have all the bits, they have been in a box for a long time.

[W2ET]

The spec on Shawn's pump says it draws 27 watts. That's all but zero in HP terms. The engine would never know that load was present.

Bill

[hanleyclifford]

Originally Posted by W2ET

The spec on Shawn's pump says it draws 27 watts. That's all but zero in HP terms. The engine would never know that load was present.

Bill

How about the mechanical pump?