Crankcase vacuum pulse on Changfa clone?

[vdubnut62]

Does anyone have an idea if the Changfa clones have enough of a crankcase "pulse" to operate a fuel pump?
If they do, where would you connect the pulse line?
Ron.

[rcavictim]

I'd like to learn how Changfa deals with crankcase ventillation on their 1115 engine.  Anyone know?

[flywheel]

I'd like to learn how Changfa deals with crankcase ventillation on their 1115 engine.  Anyone know?

The changfa zs1115 has its crankcase vent flapper vavle located on the inside of the gearcase. There is a series of baffles and a thin flapper vave and vent outlet hole in the gearcase housing. The vent outlet is located on gearcase housing on the ip side of the 1115 engine. pix attached showing its location on the 1115.

All china singles that I'm familiar with use this same type vent but the outlet and valve may be in a different location, my redstone vent outlet and valve is on the access door edge behind the starter with the vent opening facing the flywheel.

 

[rcavictim]

Thanx for that info!  I never would have found that through external inspection.  On my JD175A it is as you said on the rear access door cover of the crankcase.  I ran a small rubber hose from it into the air inlet manifold pipe between the air filter and the intake port on mine.

[flywheel]

Thanx for that info!  I never would have found that through external inspection.  On my JD175A it is as you said on the rear access door cover of the crankcase.  I ran a small rubber hose from it into the air inlet manifold pipe between the air filter and the intake port on mine.

You can also find the location of the crankcase vent outlet on nearly any china single by turning the engine over   with the flywheel by hand and listen for the hissing sound of air escaping from the crankcase.  Do this with the compression release on so you can easily rotate the flywheel by hand.
                                                                                                flywheel

[rcavictim]

Thanx for that info!  I never would have found that through external inspection.  On my JD175A it is as you said on the rear access door cover of the crankcase.  I ran a small rubber hose from it into the air inlet manifold pipe between the air filter and the intake port on mine.

You can also find the location of the crankcase vent outlet on nearly any china single by turning the engine over   with the flywheel by hand and listen for the hissing sound of air escaping from the crankcase.  Do this with the compression release on so you can easily rotate the flywheel by hand.
                                                                                                flywheel

Good idea!

[vdubnut62]

Hey flywheel, or anyone that knows, what is the deal with the what looks like a plastic reducer fitting in the ccase vent? If I attempt to take it out, can I replace it with a barb fitting? Or is there a bunch of springs and valving that will attempt to explode and hide under everything in the shop?
  I am puzzled by my engine brand also, it says Xing Dong on the ID plate. It has CF inside a diamond shape stamped into the oil pan.
It also has JD inside a diamond shape cast into the counterweights. Are these things(or just this one) assembled from random parts???
Are all the China clones that similar? Or am I just missing something that is obvious to everyone else?
Yes, it does seem that I am playing 60 questions, sorry!
Ron

[flywheel]

Hey flywheel, or anyone that knows, what is the deal with the what looks like a plastic reducer fitting in the ccase vent? If I attempt to take it out, can I replace it with a barb fitting? Or is there a bunch of springs and valving that will attempt to explode and hide under everything in the shop?
  I am puzzled by my engine brand also, it says Xing Dong on the ID plate. It has CF inside a diamond shape stamped into the oil pan.
It also has JD inside a diamond shape cast into the counterweights. Are these things(or just this one) assembled from random parts???
Are all the China clones that similar? Or am I just missing something that is obvious to everyone else?
Yes, it does seem that I am playing 60 questions, sorry!
Ron

Not sure what the plastic thingie is, a pix may help.
Your engine is no different than most any other china single, you will find many different symbols and logos on various parts and pieces.  They are the logos and symbols of the company that made that particular part, just as the US automakers rely on various part suppliers.  No company makes all the parts and pieces of their particular engine brand including changfa.  You don't have a oddball engine, its just like the rest of them.
                                                                                                                                 flywheel

[vdubnut62]

Sorry about expecting you to read my mind on this, I can be pretty obtuse. Here is the picture.
What I am referring to is the blue hexagonal thing below the fuel line, and above the ragged looking piece of a leaf(I think it's a leaf!)
It looks like a common pipe reducer, but no threads inside. I do know that it is part of the crankcase vent.
It would be really cool to be able to replace it with a hose barb and use the pulse to operate an old pump/filter/settling bowl that Dad liberated from an old outboard years ago. I figure that there will have to be some type of vent to the atmosphere with the appropriate restriction. That will be fun to figure out the size of!
Thanks,Ron.

[flywheel]

Sorry about expecting you to read my mind on this, I can be pretty obtuse. Here is the picture.
What I am referring to is the blue hexagonal thing below the fuel line, and above the ragged looking piece of a leaf(I think it's a leaf!)
It looks like a common pipe reducer, but no threads inside. I do know that it is part of the crankcase vent.
It would be really cool to be able to replace it with a hose barb and use the pulse to operate an old pump/filter/settling bowl that Dad liberated from an old outboard years ago. I figure that there will have to be some type of vent to the atmosphere with the appropriate restriction. That will be fun to figure out the size of!
Thanks,Ron.

From what I can see and by your description it would appear to me that this threaded fitting screws into the vent chamber located inside the gearcase.  If you take it out the vent MAY drop down inside the gearcase, I don't know what else holds the vent in place inside the gearcase on your engine.


If you did unscrew it and something falls into the gears then you have to remove the engine sidecover to remove it.

                                                                                                                                     flywheel

[vdubnut62]

OH BOY!! What the heck, I need an excuse to dig a little deeper!
Thanks for the info.
Ron