Im lost without the PW thread!!!!

[dingleberry]

yo yo

[philwsailz]

30 wt oil in the crank case, and they actually recommend marvel mystery oil be used occasionally in the spark plug holes as ring maintenance

[dingleberry]

yo yo

yo yo ma

[dingleberry]

so 'been reading up on the little motor in the sailboat. Atomic 4 flat-head in-line 4. Simple 1:1 tranny, with a reduction gear reverse. Simple little motor, except it has an updarft carb....

Sorry - for the mechanically ignorant, like myself, what does that mean? Updarft carb?

[philwsailz]

OY!

[dingleberry]

Oy - good morning!

[philwsailz]

Sorry - for the mechanically ignorant, like myself, what does that mean? Updarft carb?

Updraft carbs are just so specialty.... You only hear updraft carb on like old 60's racing cars, or old old old Chris Craft boat motors....

I am really not sure technically how they differ, but they do not sit on top of the motor, so I guess there is a benefit in case of a stuck float; you don't fill your motor with fuel

[philwsailz]

Here is a panoramic view of the motor. this one has obviously been rebuilt.

http://www.moyermarine.com/360/index.html

[dingleberry]

OK. I'll take your word for it that they are unusual and interesting.

[Domsz06]

OY is right!

[jwanck11]

Updraft carbs are just so specialty.... You only hear updraft carb on like old 60's racing cars, or old old old Chris Craft boat motors....

I am really not sure technically how they differ, but they do not sit on top of the motor, so I guess there is a benefit in case of a stuck float; you don't fill your motor with fuel

odd. in looking at the carb, you can tell where the gas enters, but where does the air enter? It looks like the air/fuel mixture enters the head from the top of the carb which i guess means the air is pulled from below?

just seems so odd in a boat application where id think youd want the air intake as far vertical as possible.

[philwsailz]

odd. in looking at the carb, you can tell where the gas enters, but where does the air enter? It looks like the air/fuel mixture enters the head from the top of the carb which i guess means the air is pulled from below?

just seems so odd in a boat application where id think youd want the air intake as far vertical as possible.

You see that scoop thing with the square grate forward of the carburetor? that is the flame arrester. The rubber tube is the crankcase ventilation tube. the original design, as shown, presumes enough suction at the flame arrester to evacutate crakcase gasses... Ther eis a modification that uses a more moder PCV systm to provide a more positive means of burning the crankcase gasses to keeep that smell out of the boat interior

[philwsailz]

The brass plug just below and aft of the carb is the drain for the crankcase. There is a mod for this also, which provides a long tube that is permanently installed there, and led to a convenient point of access. Then you connect to the tube with a vacuum tank to suck the oil from teh pan....

The oil dipstick is back behind the head, over by the water pump. That is hard to get to in most installations as well.... yes, a mod is available too....

[Jeffe]

Its going to be one of those days...

[jwanck11]

You see that scoop thing with the square grate forward of the carburetor? that is the flame arrester. The rubber tube is the crankcase ventilation tube. the original design, as shown, presumes enough suction at the flame arrester to evacutate crakcase gasses... Ther eis a modification that uses a more moder PCV systm to provide a more positive means of burning the crankcase gasses to keeep that smell out of the boat interior

Ahhh OK.

For one so little, that seems like a fairly complicated set up.