No engine I know of will even run set at 4 degrees ATD.....Unless you want to run it clockwise, in which case it's still wrong..
Good looking stuff, Milton.....

Here is the rough draft of my flywheel lightened up a bit. Still have to smooth and balance it.

Thanks for posting, Milton. How do you set the timing, do you just place the magnet in the flywheel when you firt set it up? I don't have a lathe, but a friend does. I have no clue what the flywheel/prop hub design is like where it mates to the shaft. Is anyone willing to post some blueprints?

If you look at thestock flywheel you will see 3 magnets instead of 2 this means it has built in timming advance, this is the same setup that fuji advertises as ATM advance timing modual, a ignition with out advance will idle rougher and not as low that is why I left the magneto on it,it idles almost as good as any of my syncro systems.

Darin

Milton: Is the fly-wheel more of a ring with a place to mount the magnet to trip the pickup sensor? Can you post about the same photo with the complete prop adapter in view...using about the same camera angle? Looks like a nice set-up. I did see a post when a guy bought the Falkon ignition for uner $80. You are right...they upped the price. I am reading a few ignition designers(group effort) will have a do it yourself ignition system with parts that can be bought for a total of under $40 sometime in the next few months. Capt,n

Darin: I think you got the right idea. For the Poulan 46cc use stock flywheel ignition. Other conversions may do better with your CH or Falkon or RC ignition systems. Capt,n

The engine is setting on TDC as you look at it.
Milton

Can not get pic to post Will try later
Milton

Not so 3 magnets are just a different way do doing a mag....Look at the Zenoah engines 26, 45,62 74,80 all 3 magnets no auto advance.

the zenoah coils are not set up for this, as I understand it when the engine is at a idle it will fire two times once with the first two magnets and again at the last two magnets so the second fire really does not do much because it is already ignited but when it gets to a certain speed it cuts out the first spark so it then retards the spark at what rpm it changes I do not know, it is not a slope advance but a fixed advance system.this is only what I understand I cannot guaranty the merrit of my statement because when I was looking into this I didnot keep track of my info findings.

but hey if you have some further info on the subject lets hear it I could be wrong.


Darin

I just hate not being able to back up anything I state so I did a little checking around and found it is in the MA type coils made by walbro this is what is in my hand now and it goes on the poulan 42cc there is a very brief discription on walbro website about this.

Darin

TKG: Back to your post # 34. If I read this correctly, on the walbro website.... some mag- type ignitions DO have the analog advance. Have you read this? What do you think? I may be dead wrong...I DO NOT KNOW?

TKG also compare the coil # to the walbro web site, the zenoah might even be advance ign. as well,the phellon ign. is really weak compared to the walbro.

Darin

No hi tec PHD stuff.
Just put a timing light on the engine. Make a mark on flywheel and one on crankcase. See if the flywheel mark moves as rpm changes.

Here's how the Stihl slope advance ignition system works:

Does that mean my three-magnet Poulan 46 HAS some timing advancement?

From the diagram above it seams similar...

Good Thread! Lot's of cool info out here...
CrazyHerb

my poulan 46 mag and coil setup (stock) have timing advance so yours should to just look at the bottom of the coil and see if it is a type MA.

Darin

TKG: I do have a timing light...but I do not have any of the latest engines with the MA mag-coil on it. Have you checked all the ignition units walbro produces with a timing light?? I am sure they would not do false advertising. CaptinJohn

TKG: I am still waiting for your reply. Have you checked any of the new engines that have auto-advance of some type with your timing light? CaptinJohn

Does the 46 need the cooling fins below the exhaust port? Most of the aircraft engines don't have any and this motor was designed to run in an enclosure. Just looking for lightening and opinions.

h82crash the most on can really save from shaving the head is about 2 oz. most are shaved for cosmetic reason not for much weight savings I would leave it alone.


Darin

don't mess with the cylinder head, lighten up everything but the head...... you can probably polish them to get better cooling, but don't shave em, concentrate on the rest of the engine, for example flywheel, piston rod, piston, but be carefull, I would probably give the engine to a professional to blue print it

Been at a fly-in all weekend.
So far the engines we have checked with adjustable mags (with extra lip) do show timing changes. Not a lot, but enough to calm down the idle some.

TKG: Thank you very much for the news. It does take a lot of time and effort to do all this for us engine lovers. I hope you did have fun at the fly-in. I sure like going to them myself. Not many around here with very many gas engines. Smooth landings...CaptinJohn

When I read to balance the flywheel after cutting the fins off, balance how? Like it was before cutting (heavy on the magnet side), or balanced evenly?