Memmeddu
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- Italia Sardegna
Hi everyone
In previous threads and in the "stuff you made today" I've already asked questions and share progresses about my lombardini engine.
Last time I've worked on it I've been so frustrated because the magneto and points ignition system originally used on this engine back in the 1950's .
This morning another light bulb came on my head .
And now I would like to seek advice about because I'm concerned about few aspects of my idea.
A permanent solution but also an heavy modification that cannot be reversed back to original .
It's a do once and can't commit mistakes kind of modification .
So the problem is
magneto rotor has a tapered shaft ,it does have a key groove but no key at all because the gear where it fits doesn't have any key grooves .
No timing references on both rotor or gears .
The taper kinda slips in the gear so I'll always have timing problems .
I can really get those two parts fit together really tight but it will put much pressure on both components and it will not be enough accurate because while tightening them the rotor will spin increasing the timing advance .
It could even work but I already failed once and to break them a part I've broken the threads on the magneto housing , forcing me to take everything a part again.
Now my idea use a piece of alluminium flat bar bolted on the flywheel at top dead center
And make a points holder moved to the new position
Essentially my idea is use a fixed point (the flywheel ) with a protuberance which will make the points to open 30° BTDC and close 60 to 90° ATDC
Engine original timing is 30° BTDC and 150° ATDC
180° cycle
The only serious difficult of this Idea is balancing the flywheel because of the added weight
Any idea ?
In previous threads and in the "stuff you made today" I've already asked questions and share progresses about my lombardini engine.
Last time I've worked on it I've been so frustrated because the magneto and points ignition system originally used on this engine back in the 1950's .
This morning another light bulb came on my head .
And now I would like to seek advice about because I'm concerned about few aspects of my idea.
A permanent solution but also an heavy modification that cannot be reversed back to original .
It's a do once and can't commit mistakes kind of modification .
So the problem is
magneto rotor has a tapered shaft ,it does have a key groove but no key at all because the gear where it fits doesn't have any key grooves .
No timing references on both rotor or gears .
The taper kinda slips in the gear so I'll always have timing problems .
I can really get those two parts fit together really tight but it will put much pressure on both components and it will not be enough accurate because while tightening them the rotor will spin increasing the timing advance .
It could even work but I already failed once and to break them a part I've broken the threads on the magneto housing , forcing me to take everything a part again.
Now my idea use a piece of alluminium flat bar bolted on the flywheel at top dead center
And make a points holder moved to the new position
Essentially my idea is use a fixed point (the flywheel ) with a protuberance which will make the points to open 30° BTDC and close 60 to 90° ATDC
Engine original timing is 30° BTDC and 150° ATDC
180° cycle
The only serious difficult of this Idea is balancing the flywheel because of the added weight
Any idea ?