chinese valveless/ignition system cricuits?

[Tony~]

I'm gonna buy a welder now...And i'm planning on building an chinese valveless, looks easy enough for a first timer but I can't get ahold of any good plans because this site aint working (i'm just getting a 404).

But there's only one problem...How do you connect the sparkplug, ignition coil and everything, a circuit diagram would be much appriciated.

An does it work with liqued fuel like gasoline?

[Stephen H]

try the site now, it worked for me... if not ill post the plans here for you!

Stephen

[Tony~]

Nope, it aint working. It would be greate if you could put em up here, thanx.

Anybody now if you can scale the chinese valveless down a little bit based on the plans adn have it still working? (Found some great pipe to use from my garage i.e exhaust pipe from a car.)

Any idea where to find circuit diagrams for the ignition system.

[resosys]

Any idea where to find circuit diagrams for the ignition system.

I'll post the circuit I use for bench testing later today or tomorrow.

Chris

[Tony~]

ok, thanx!

[Stephen H]

here ya go tony.. also go look in the old forums if they are still up or when they come back up.. there is alot of infomation there about scaling up or down...

Stephen

[Tony~]

Thanx for the plans, but is it in cm or inches?

[Tom]

the measurements are in inches, see the fractions after the whole numbers, and the symbol for inch ( " )

Tom

[Tony~]

Ah, right...I live in Sweden and here we have the metric system thats why I wasn't sure. Anyway, I have calcuated the measurments to cm so now it's piece a cake to read it. I've also made a 3D-model off the puslejet with the right scale.

[resosys]

I started drawing up my circuit, then decided to see if anyone else had a schematic on the net that was similar. Google comes through again!

I'm not sure if Sweden is 110 or 220/240. This circuit shows 240 mains. Since I use 110 here, I use a 5uF, 240v motor run cap. Make sure not to use motor start caps as they are not rated for continuous use.

I've run the circuit below for 30 minutes straight with a jacob's ladder on the coil with no issues. The coil temperature increased a bit but was not anywhere near that of an operating coil in an automobile.

http://loneoceans.com/lo_main/projects/ignitioncoil/

The image below shows my test rig with an odd, two electrode coil (on a messy bench). You can see the cap and standard household wall mount dimmer.

If you get to the point where you want a mobile spark circuit that will run off of a 12v battery, I'll dig up a 555 timer based circuit that seems to work pretty well.

Hope this helps.

Chris

[Tony~]

Thanks very much!

The capacitor is used for continiuos sparking right? And if you were to have switch to break the current instead there would be only one spark right?

[Tony~]

Thanks very much!

The capacitor is used for continiuos sparking right? And if you were to have switch to break the current instead there would be only one spark right?

And one more thing, does anybody know how much the chinese valveless based on the plans put out in thrust?

[resosys]

Thanks very much!

The capacitor is used for continiuos sparking right? And if you were to have switch to break the current instead there would be only one spark right?

And one more thing, does anybody know how much the chinese valveless based on the plans put out in thrust?

You're welcome.

The cap is necessary to switch the current on and off into the coil primary.

You may get one spark out of a coil if you flip a switch on and off. The coil will get very hot if the switch is left on.

I'm not sure about the chinese engine thrust, but I've heard they don't make much compared to other valveless designs.

Chris

[Stephen H]

correct me if i am wrong but i THINK about 3-4 lbs of thurst, not much but its a basic design!

Stephen

[Tony~]

What would happen if you placed the intake at the bottom off the combustion chamber? Would it perhaps increase thrust since the fresh air is sucked back in more freely? But on the other hand when the intake is where it is on the plans then it contributes to some compression of the gasses.

Here's a pic to show what I mean;