My first petrol engine. CRRC PRO40i self build kit

[Kevin Fairgrieve]

The title says it all really.

 

The engine has a CDI ignition and one of the magnets is on the bottom of the crank case The other is recessed into the prop driver.

 

My question is this.

 

Where should the 3 be lined op to achive the best results?

 

Prop at 2 o`clock magnet at 4 o`clock etc etc

 

Does that make any sense?

 

 

[Doug Ireland]

Hi Kevin, I can't work out why there is a magnet on the crankcase unless you mean the "ignition sensor" itself? I've looked at the assembly drawings for this engine and it appears the sensor is attached at the very bottom of the crankcase. The magnet in the prop driver will have already been positioned to give the correct timing. As the prop driver is keyed onto the crankshaft there should be no timing issues for you to worry about.

[Brian Cooper]

I have got one of these 40cc engines, and jolly good it is too.

7,500 RPM on a 20"X 8" prop and still running in.

 

Don't worry about the ignition as it is set to fire at the right amount of degrees before top-dead-centre (I forget the exact figures).

Fit the prop in the normal position of about 2 o'clock, just at the start of compression.

 

B.C.

[Kevin Fairgrieve]

Sorry not explained very well.

 

Sensor on crankcase, magnet on prop driver.

 

As you say the magnets position is pre set. What I am after is the prop position in relation to the magnet and sensor. Should it be set like a glo engine so that it is at about 2 oclock when the piston is at TDC?

 

Is that any clearer?

 

Getting myself confused now....

Edited By Kevin Fairgrieve on 29/06/2010 12:20:22

[Kevin Fairgrieve]

LOL

 

Was typing as the above posts came in.

 

I think Brian has hit it on the head. Thats what I thought.

 

Will give it a go tomorrow..

[Doug Ireland]

I'm left handed so I set my props at 10 o'clock.

[Martin Harris - Moderator]

I set my props at any time of the day!  

[Doug Ireland]

[Myron Beaumont]

Martin

Are you ambidextrous then ?   -and what about if the engine is inverted ?   

Thanks for making me laugh @5 o'clock in the morning whilst I clean up the cats sick !

Edited By Myron Beaumont on 30/06/2010 05:33:22