bob_nj

My Feedback: (62)

I'm having an issue with my engine and need some advice from some of you experienced gas guys.
I can dance all over a glow engine, but am kind of new to gas stuff.

My ignition is firing but the engine won't pop. Maybe the ignition isn't firing at 100% or something, but the engine won't pop
with the choke on.

My real question is, if you flip the prop with the choke on for awhile with no start or pop, should the plugs be wet?
Mine aren't. I did wet the plugs manually and tried it, but still no pop. Put a little gas in the cylinder and tried that with no luck.

Is there a tutorial or website that shows how our gas engines work. I mean like showing reed vavles and things like that?

Thanks and have a good weekend_bob

pe reivers

ZDZ has [link=http://zdz-modelmotor.cz/zdz/en/]directions for use [/link] on their website which may be of some help to you.

bob_nj

My Feedback: (62)

Thanks

I'll check it out_bob

Geistware

My Feedback: (16)

Make sure you have a spark, if the plug is not lightly damp or you can smell gas then it may not be primed enough. I usually had flip with the ignition off until the gas is leaking out of the carb. (twin) Then it fires on the first flip with the ignition on, no choke.

Diablo-RCU

My Feedback: (1)

Yes, the plugs should get wet with gas if you keep flipping with the choke on and the ignition off.

bob_nj

My Feedback: (62)

It's a Tillotson carb on a 100. What can I do first to start tracking down the problem?

Basically, it flew fine the last time out. This time it won't even fire.

Thanks_bob

peso

Check that you have gas in the fuel line close to the carburetor. A common problem with ZDZ is that they do not choke very well when the carburetor is dry.
/PO

OSilfa

My Feedback: (2)

I think that you have a 3W,please check your low needle maybe is too lean.

Oscar Silfa

Diablo-RCU

My Feedback: (1)

If it was fine last time and now it won't draw gas, it isn't the needle settings.
Work from the tank and go forward. I would replace the fuel lines and felt clunk. Then remove the carb and clean the screen. You can also put a diaphragm kit in the carb while you have it apart.

OSilfa

My Feedback: (2)

It so simple check the low needle!!!!!

bob_nj

My Feedback: (62)

Thanks Osilfa. The engine is two years old.
It has always flown with a setting of right around 1 on the hi side, and about 1.25 on the low side. They are indeed set at that.
I just took the carb apart again and it's clean on the inside. The needle "pops off" at around 14 which is what I expected.

I'm going to put it all back together.
If I pull the plugs, choke it and flip, I should see fuel running out of the carb right?
Would that be a good starting point?

If fuel does drip from the carb, and I put the plugs back in and flip it some more with the choke on, the engine shoud pop, or the plups
should be wet, right?

OSilfa

My Feedback: (2)

Yes you are correct.I tell you this because i haved the same problems 3 years ago with 3w42.it can be a little particle in the low neddle that close the system.
I do everythinks trying to find the difficult at the end was so simple and i can't fly all the weekend by this.

bob_nj

My Feedback: (62)

What did you do to find the particle?
I didn't see anything, but should I blow air anywhere?

Thanks_bob

OSilfa

My Feedback: (2)

Yes you can blow air anywhere>
I assume that because when i opened the low needle the engine pop, and fuel drop from the carburator then start ,later when i recheck the adjustment the for the best transition the neddle will be at the same possition.

OSilfa

My Feedback: (2)

Your carburator fuel pump diaphragm is rubber or fiber??SOme carburator came with fiber diafram that is very good but when is very dry don't pump,just moisture with gas the diaphram and install it.

bob_nj

My Feedback: (62)

My diaphram is like a very thin plastic.

OSilfa

My Feedback: (2)

Like this!!!!!!Moisture to it ..that's it..[:-]

bob_nj

My Feedback: (62)

In post #15, the item you have listed as a "diaphram" is very thin plastic in my carb.
The carb is a Tilottson HS 232E if I recall.

What are you thinking?

OSilfa

My Feedback: (2)

It's the same of the post 17 just different model of carburator one rubber and the other is fiber(like plastic).
If your diaphfrgm(fuel pump membrane) is very dry the pump don't work that is i tell you that just moisture with gas the membrane and install it and then it works perfectly.That thinks just happen with the fiber membrane.

bob_nj

My Feedback: (62)

Will fliiping the prop with the choke on wet the diaphram.
In other words, if the carb is dripping fuel, is the membrane wet?

OSilfa

My Feedback: (2)

Yes,if the carburator is dripping fuel ,the membrane is wet.

bob_nj

My Feedback: (62)

Hopefully I can get it back together tonight and try it.
I'll let you know.

By the way, what is the function of the reeds, and how do they relate to any of this?

Any diagrams or tutorials on the engines that would help me understand/visualize what's going on in there?

Take care_bob

OSilfa

My Feedback: (2)

Check this link.

http://www.aerocorsair.com./id27.htm

bob_nj

My Feedback: (62)

Thanks.

I do have that link. That's where I learned about pop off pressures.
I didn't see anything on the internal workings, or the reed valves.
Is there a particular page you are referring to?

Take care_bob

OSilfa

My Feedback: (2)

Bob, I only can offer you the service manual of the tillotson HS,if you are interesting please send me a pm with your e-mail
the service manual give a good explanation of the operation data.