Dear Friends,


I finish starting up a Homelite 30cc (1.85ci) with a CDI Falkon (of a ZDZ), rpm with one wood propeller 20x8 was of 4900 and with a APC 18x6 was 7000.
If somebody has values of tests of this same motor, it would please to me to compare them with mine.
[8D]Thanks

30cc, CH ignition, bigger carb, better muffler. APC 18x8 8000rpm

Hi,
what carb did you put on it?
The CH ignition of what engine is?
Thanks

WT-9 carb, also good WT-499 and WT197.
www.ch-ignitions.com
Your ZDZ ignition should be OK. Set the ignition timing for 30deg BTDC.
The factory muffler is quiet but reduces power by 800-1000 rpm.
Also check to see if your engine has a decomression hole just above the muffler. If it does plug it.

Thank you very much TKG
the truth is that quize I didn´t know for what served that hole, I didn´t cover it by fear to that the motor lost power.
I will prove covered that hole and placing the ignition point where you has said me.
What type of escape recommends to me?
My carburetor is a ZAMA of 1/2" intake, is too small?

Good flights friend...[8D]

pichi,

I have one of those engines that I converted. The engine will start and run fine with the magneto. You have to cut down the fins on the front of the flywheel.

Plugging that hole will increase compression quite a bit and give it more power. I plugged it by running a tap part way in and using a set screw. Be careful not to get metal chips in the exhaust port.

That ZAMA carbureter gives poor performance. If you get the bigger carb(#28 stamped inside) the engine will really come alive.

Jim

Thanks Jim,

I already made the ignition convertion.
I bought the FALKON CDI in France and maked the pieces to suport the propeller and glued the little magneto into the hub (for the sensor).
I did it because I supposed that the engine will be very heavy with the original coil and magneto...thanks anyway.
I will try to find this kind of Walbro carbs, but, what inlet diameter must to have?
My ZAMA has 1/2 inch (12,7mm), and has a manual pump to fatten the internal pump.
Thank you again Jim.

Sergio

The carb that comes on a Homelite 30 has a 5/16" bore. The carbs that people are recommending to you have a 7/16" bore.

You have to measure the carb at its venturi position (hard to do). This is the minimum diameter of the carb's bore. The 1/2" that you are reporting to us must be the diameter of the carb at the point where it attaches to the engine?

How did you determine the correct timing position for installation of the magnet into your prop driving hub? TKG is suggesting that the relationship to trigger your ignition system be set to occur at 28-30 degrees before top dead center of the piston stroke.

Enjoy,

Jim

Just a thought. I'm not sure how the ZDZ ignition adjust the timing.
SOOO what you want is the MAXIMUN timing advance to be 30 deg BTDC. NOT the static timing

Friends...
The diameter of 1/2" is in the part of the union with the admission.
You are right, is difficult to take the measurement within the Venturi, reason why I suppose that that measurement is the one that it will have to be but great for a greater power.
I completed the ignitoin based on which it indicates the manufacturer (Falkon) in its Web page (www.falkon.cz), in addition, I was proving different positions until finding the greater number of rpm.
I will try to find walbro of the characteristics that have mentioned to me.
Thank you again

Sergio

Hi
do you have static thrust measurements?
Suerte
Jose

The larger carb listed at wackerengines.com is the Walbro WT433.

José,

te cuento, el motor es uno que saque de una cortadora de cesped a tansa, o desmalezadora.
Es una HOMELITE 185, que serian 1.85 ci o 30.33cc (la compre en enero cuando estube en Buenos Aires)
Las pruebas estaticas que hice me dieron este resultado:
Con una helice de madera (tipo Master Airscrew) 20x8 llego a 4800rpm
Con una APC 18x6W a 7000 rpm

Estas pruebas las hice antes de que me explicaran de que hay que cambiar el carburador, tapar un orificio que tiene el escape (que sirve de descompresor) y de cambiar el escape original.
Yo lo qu ehice fue tapar ese orificio y vacié el interior del escape original, pero, el tubo de salida lo cambie de posicion y lo puse a raz de la chapa por el lado interno, o sea, el tubo no entra dentro de la camara del escape.
Por otro lado, no lleva el encendido a magneto, se lo saqué y le puse uno electronico, le puse el mismo que usa el motor ZDZ de 40cc, ya que dicen que el de magneto genera muchas interferencias.
Para mi entender, el motor iria muy bien en un acrobatico ala baja de 1,75 mt de envergadura, o en un biplano de 1,55 a 1,60 (segun, si es acrobatico o no)
Espero te sirva la informacion...
Y a volar, que en la Patagonia hay mucho viento hermano!!!!
Sergio

Hola
Gracias por los numeros.
Yo estoy trabajando con un Weedeater 25 cc de desmalezadora.
Tengo helices hechas a mano.
Hace pruebas a escape libre, sin nada y despues ponele silenciador.
Generalmente el silenciador saca potencia.
Mejora con caño de escape de diametro grande.
Dichoso vos que podes meterle mano a un CDI de motor ZDZ.
Si, el magneto original genera interferencias, pero se curan con una malla de cobre envuelta sobre el cable de bujia, y conectada al block siempre que el cable sea de buena calidad y no tenga perdidas.
A un weedeater 18 cc que teniamos en el club lo volamos asi, tambien a un Homelite 25 cc.
Aca hay viento para todos.
Aprovecha para aprender con este motor, y despues podes meter mano a uno de motosierra, la relacion peso potencia es mejor, no es dificil adaptarlos, y en este sitio te ayudan mucho.
No se a cuanto podes conseguir uno usado, saca el escape y mira para adentro el piston y la camisa brillante y sin rayaduras , listo para volar !!!
Gracias a lo que aprendi aca pude encarar los motores a nafta.
El acrobatico de 1.75 m tiene que ser liviano de acuerdo a lo que dicen aca.
Yo estoy armando un ala volante de 2 m y espero 4.5 Kg, ala de telgopor enchapado con papel madera y fuselaje de terciada de alamo.
Suerte
Jose

Mirá, por lo qu eestube leyendo por acá, los mejores motores son los Poulan, son los que mejor relacion peso/potencia tienen.
Intentaré encontrar alguno por acá, ya que el que compre en allá en Buenos Aires lo consegui de pura casualidad a 50 euros (la maquina entera).
EL CDI Falkon es muy bueno, sin embargo, fijate aca arriba, que un chabon me dice de otra marca de CDI, es uno que lo fabrican en EE UU, y lo venden por 89 dolares.
Yo no sé si vale la pena cambiar el magneto por el CDI, mi unico pensamiento fué...
1) menor interferencia
2) menor peso
3) mejor arranque en frio

...aunque el proximo creo que lo vuelo con magneto.

Como esta el hoby por alla?
Me traje unas 4 "EL AEROMODELISTA" y la verdad es que esta todo muy caro, hasta en dolares esta caro, es imposible ser aeromodelista si no tenes mucha guita.
Esta sabado seguro que lo veo a MArcelo COlombo y seguro le voy a preguntar tambien como esta el tema.
Un abrazo.

Buenos vuelos!!!

Sergio

Partial translation of post #13:

José,

You story, the motor is one that remove of a cortadora of cesped to tansa, or desmalezadora. It is a HOMELITE 185, that serian 1.85 ci or 30.33cc (buy it in January when estube in buenos aires) The tests estaticas that did they gave me this result: With a helice of wood (type Master
Airscrew) 20x8 arrive at 4800rpm With an APC 18x6W to 7000 rpm

These tests I did them before they explained me that one must change the carburetor, to cover an orifice that has the escape (that serves of descompresor) and to change the original escape. I it qu ehice went to cover that orifice and I emptied the interior of the original escape, but, the pipe at the outset change it of posicion and I put it to raz of the sheet by the internal side, that is to say, the pipe does not enter inside the camara of the escape. On the other hand, does not carry the lit to magneto, I was removed it and I put it one electronico, I put it the same one that uses the motor one ZDZ of 40cc, since say that that of magneto generates many interferences. For my to understand, the motor one iria very well in an acrobatico low wing of 1,75 mt of importance, or in a biplano from 1,55 to 1,60 (segun, if is acrobatico or not) I Expect serve you the informacion.. And to fly, that in the Patagonia there is a great deal of wind brother! !!! Sergio





w8ye - Moderator

Partial translation of post #14:

Hello Thanks by the numeros. I am working with a Weedeater 25 cc of desmalezadora. I have helices done by hand. It does tests to free escape, without nothing and despues you put him silenciador. Generally the silenciador removes power. Improvement with pipe of escape of diametro large. Happy vos that you can put him hand to a CDI of motor ZDZ. If, the original magneto generates interferences, but are cured with a netting of copper wrapped on the cable of bujia, and connected al block provided that the cable be of good quality and do not have lost. To a weedeater 18 cc that teniamos in the club we fly it asi, tambien to a Homelite 25 cc. Aca there is wind for all. It takes advantage of to learn with this motor, and despues you can put hand to one of motosierra, the relacion weight power is better, is not dificil to adapt them, and in this place help you a great deal. Itself not to as much as you can obtain one used, removes the escape and sight for inside the piston and the brilliant shirt and without rayaduras, ready to fly!! Thanks to what aprendi aca could face the motors to nafta. The acrobatico of 1.75 m has to be light according to what say aca. I am arming a wing steering wheel of 2 m and I expect 4.5 Kg, wing of telgopor veneer with role wood and fuselaje of terciada of alamo. Luck Jose

W8ye - moderator

Partial translation of post # 15

Mirá, by it qu eestube reading for here, the better motors are the Poulan, are the ones that better relacion weight/power have. I will try to find some by here, since the one that buy in there in buenos aires it consegui of pure coincidence to 50 euro (plots it entire). THE CDI Falkon is very good, nevertheless, you set you up the aca, that a chabon says me of another marks of CDI, is one that manufacture it in the United States, and sell it for 89 dolares. I do not know if is worth while to change the magneto by the CDI, my unico thought was.. 1) smaller interference 2) smaller weight 3) better starter in frio

...Aunque the proximo believe that I fly it with magneto.

As this the hoby by alla? I brought myself some 4 "THE AEROMODELISTA" and the truth is that this all very expensive, even in dolares this expensive one, is impossible to be aeromodelista if do not you have a great deal of twine. This sabado sure that I see MARK IT it COlombo and sure I am going to ask it tambien as this the theme. A hug.

Good flights!!

Sergio

W8ye - moderator