Head Identification

[conchy joe]

Hey guys, looking for a hand identifying my marine head. I have a 76 28FBC with an electric head. The motor runs fine, but the hard nylon impeller is junk. The motor/base has been painted over and I don't see any markings. Any assistance would be appreciated.

Troy

[Bruce]

Really hard to tell without a pic. Anybody could have installed anything from a Raritan to a Par to a Groco to a Wilcox Critenden.

[bob lico]

is there a round cylinder glassed in to the left side under toilet seat as you look at it containing the motor???

[conchy joe]

http://gallery.me.com/nitroxgod#100109

Thanks to all.

[CaptPatrick]

Old Crown Raritan head......

See: http://www.raritaneng.com/pdf_files/cro ... dv0900.pdf

[conchy joe]

Capt Patrick,

You are the man. Thank you very much.


Troy

[Harry Babb]

I bought a kit and rebuilt mine....not much to them......I think the kit was around 45 bucks.....then I needed a couple of other parts that did not come in the kit....still ended up in good shape.

Rartian has an exchange program but its quite pricey.

Do a Google search for parts......everything you need is available


hb

[Bruce]

The biggest issue I saw with those was power. If they turn slower than rated due to low batteries or smaller than needed guage wire they backed up.

60 amps is quite a bit for a head.

[Harry Babb]

60 amps is quite a bit for a head.

That is a lot! !

I know we are not comparing apples to apples here but I have 10 HP compressor that don't draw 60 amps

hb

[CaptPatrick]

The macerator pumps on the old style heads are basically truck style starter motors with a little two prong cutting wheel that took almost nothing to bind up and stop the motor. Biggest killer was Tampax...

[JP Dalik]

Hah Tampax hated those little freaking strings- all wound up on the blades and drive screw.

That little damn box always showed itself after the clog.

Should of had a warning for men built into the name;

T- To
A- All
M- Men
P- Pop
A- Another
X- Xanax Its gonna be a long week

[CaptPatrick]

A friend had a plaque above the head that read: If didn't first go through your mouth, don't put into the head.

[Bruce]

That is a lot! !

I know we are not comparing apples to apples here but I have 10 HP compressor that don't draw 60 amps

hb

Well as in ac and dc, the higher the voltage generaly the lower the current. More involved than just that but its a basic.
A 2hp motor will draw less current on 220 than 120.

Add a capacitor start motor over an induction start and that drops the power even more.

But you can't control speed easily as you can on dc which is why most loco's use dc as the drive source.

Ohms law formula for dc and ac circuits compare. DC = E(voltage)= I(current) x R(resistance). AC = E(voltage)= I(current) x Z(impedance).

Like most formulas if you know 2 you can find the 3rd.

The 12v crown was almost 1hp or about 720 watts. 1hp = 746 watts

Watts or P(power) can be found by the formula E(voltage) X I(current)

A handy formula when working with invertors and figuring battery draw and capacity needed.

The 24 and 32 volt crown drew less amperage than the 12 volt or any dc stuff.

Its why many times I ran into boats that were almost all 12v except for the diesel start circuits which were 24v. Starter motors would be to big in physical size to be able to one start the engines under that voltage but also bleed off the heat from the current draw.

As 32v faded away, I converted many boats to 24 or 12 as required.

I was a servicing dealer for Raritan in the 80's. Rebuilt hundreds of those crowns and pulled many wierd items out of the mulch chamber.

Built a test bench out of a ac motor driven altenator and 32v battery charger to supply the power for all 3 voltages up to 80 amps rather than keep battery banks in the shop.

[Hueso]

... and I thought this was an Osama thread......

[Rawleigh]

Well both would be about pieces of crap anyway!!