How much advance do you find on a newer mag ignition?

Tony as I was not doing a exact measurement of degrees. I never placed a degree wheel on that mag engine. I did have a mark on the flywheel near the stationay coil and I could see 3/8-+ advance on the MB290 Mac engine in the photo. I have since placed the engine back in the leaf blower. I have beat the crap out of that thing & it still runs great. Top RPM in that blower hurts the ears. Amazingly it will Idle down real good yet too! I use Penzoil Air cooled oil in it at 32-1 ratio. Super tough blower for $49 bucks!

Best Regards, Capt,n

So on a 4" flywheel that might be 10 degrees or so. I've read about the advancing mag never really saw just how much advance they provided. How much simpler can a mag ignition be? It would be nice to have it adjustable and offer 20 degrees advance. Contrary to popular belief, the mag parts(Two coils, pickup, and flywheel) from a GT80 weighted 392 grams while the C&H Ignition parts and 4 double A batteries weighted 413 grams, I'm sure other systems vary as the Zenoah engines use a small flywheel. The weight savings is all in the spring starter.

Tony, I went to google and typed in "walbro flywheel ignitions" and got some interesting data. I think you will like it. Capt,n http://walbro.com/brochurefiles/3368...%206-26-03.pdf

That MA series looks interesting.

On a stock DLE30 ignition, does the North Pole of the magnet face out wards? I tested 2 picks-up by passing the pick-up past a magnet & it will fire spark both ways. Flat side of pic-up and curved side towards magnet will fire. I did notice the spark occurred past the magnet further that the other side. It seems like maybe a magnet could be installed wrong on prop hub....but timing would be advanced more. Kinda strange. I thought I read a pic-up will fire on one side only? Capt,n

I am going to say the curved side toward the magnet. Does the magnet have any lettering on it, if so what side is it on?

After more checking, the magnet on the engine has got to have the North facing outward and is smaller in Dia than the other magnet that would trigger the spark from both sides of the pick-up. Also I notice the curved side of pick-up will trigger form 1/4 inch away. Flip itover & it has to be 1/16 inch away ...further than that...no spark. So it looks like curved side off all 3 picks trigger best with curve side towards North pole of magnet. I looked at the magnet on the engine (with a magnifier)& it has no letters, but I do notice a small chip on the left edge of magnet. Anyone ever replace a magnet on a DLE30? How does DLE install it ,in case I want to replace it? Capt,n

Sorry, meant if there was any lettering on the sensor.

I would not worry about the little chip.

John I don't have my 30 beside me but I know on all of my other engines the magnet just sat in the hole and then they used a punch around the hole to force the aluminum against the magnet which held it in with friction.

Yes there was lettering on the sensor....will read it tomorrow with a micro-scope! Very small. Capt,n

Thanks.

I have 3 sensor pick-ups.
#1 43F
724

#2 04E or Q4E


#3 is in the holder & I cannot remove it. A locking wedge holds it??

Thats about it. Been too busy staining decks & sealing them before winter. More deckwork tomorrow.......................................... .................................................. ..Capt,n........................

Do they all sense the magnet the same and in the same orientation as you mentioned? Or does one sense the other pole better?

They all sense the North pole the same as mentioned. On another note....I wonder why some of the places that sell these CD ignitions ...DO NOT...include the pick-up sensor. Seems like every ignition sold should include the sensor pick-up. Seems like anything Hobby related is way overpriced! I cannot believe I said that!............................................ ............... ................. Capt,n

All hall efect sensors sense a magnet pole. The response (output) to the magnet pole depends on the type of sensor. A unipolar sensor like RCEXl uses responds to either pole depending on the orientation of the sensor itself. You have the correct sensor. It's very unlikely, but possible, the magnet you have is magnetized incorrectly.

OK, I just reread your posts, and see that your magnet is chipped. Replace it. A chipped or cracked magnet creates another set of magnet poles in the magnet.

I'm with you Captain John.... those Hall sensors are way overpriced. If you look at the Digikey site or somewhere similar, you will see that the sensors themselves are super cheap. The vendors are making anywhere from 5 to 12 dollars for soldering on three wires with a connector. If anyone is wondering "what's the big deal?", well, I usually have anywhere from 5 to 12 airplanes flying at one time, and engines in testing besides. 12 bucks a pop for sensors adds up!

AV8TOR

The Rcxel hall sensor (transistor) that I have will pick up both poles depending on which way you have it orientated. But in the manual that I got with it, it says to put the letters of the transistor (04E) towards the magnet. When I do that it only picks up the north (I think) pole magnet. Since I have a south pole magnet, I turned it over and it sensed it. But when I run the motor with the Rcxel ign, it runs like crap (can't get it to rev up very good). So thinking that it needs a different magnet or different transistor, the transistor is easier to change and allows me to switch between the two different brands of ign. The manual is a copied version so it is not very clear on the pictures, so wanted to confirm the number on the transistor so that I can look for a replacement that will pick up the south pole magnet.
By the way, I had another ign fail today so I ended up replacing it with the Rcxel ign and it works great (so no problem with the ign itself).

The 04E is the one RCEXL supplies. Alegro A1104 http://www.allegromicro.com/en/Produ.../1101/1101.pdf notice it will respond to either the north or south simply depending on sensor orientation. It works almost as well with a north pole from the back side.

http://www.allegromicro.com/en/Produ...olar/index.asp

Greg

That's a non stock item at Digikey and you have to order 3,000. To get one from them will cost you $2,300

Here's one place. I had found others, but I misplaced my notebook and can't find them in my computer favorites.

$1.21 for from 1 to 24 sensors: http://us.element-14.com/jsp/search/...CMP=AFC-SF-T21

AV8TOR

When you but a RCexl ignition it should come with a hall sensor.

At least the ones I sell do.

Milton

Very interesting....maybe this would explain why sometimes my DLE30 would kick back bad. It seems like the only thing that helped....was to have the ignition battery at top charge...and I mean top...like full off the charger!

Next question is where do I get a magnet the exact size or replacement?????? Capt,n

Hi if it kicks back check the timing.
Dave.