<snip
 I also did away with one tooth to better simulate
 what will happen in the final flyaway configuration.
 There will be only one trigger tooth and four mag pickups.
 Two for ignition (about 22 degrees BTDC) and two for fuel
 injection (about 90 degrees BTDC). The angular position of
 the pickup relative to top dead center will adjust the
 timing of both 555 fuel injection and ignition.

 Paul Lamar

Paul -

You crack me up.  Just months ago when I brought up this scenario for
triggering injectors and ignition, you complained that it had too many
sensors, and that sensors weren't cheap.  :)  At the time I brought it
up more as an illustration of the rotary's simple timing arrangement
than as a design proposal.

But hey, I'm glad its value as a simple, no-moving-parts system has
become apparent.

I guess I ultimately agree that it DOES have too many sensors, too
much shielded wiring, and too many critical clearances to set.  A
timing wheel with a simple counter & multi-trigger circuit would be
more pragmatic, I think.

Just my thoughts.

-Vince Orton

Some times it takes a long time for a good idea to sink into my brain :)
There is some redundancy here. If one sensor fails it will only affect
one rotor.

These sensors are expensive. Klaus tells me he took one apart and it had
a zillion turns of very fine wire. He uses tiny rotating magnets and hall
effect
sensors instead because they are cheaper. Trouble with that is Hall effect
sensors
need voltage to work.

I am looking for a cheap source for these magnetic sensors and I may
attempt building my own. They appear easy to make. Materials are cheap.
You need some magnet wire:

http://webtronics.stores.yahoo.net/32mawi1lbspm.html

A round cylindrical bar magnet:

http://www.kjmagnetics.com/categories.asp?gclid=CJXmz-DonZgCFRwDagoddmh2Aw


And a housing made from steel threaded pipe used in lamps:

http://www.nationalartcraft.com/subcategory.asp?gid=1&cid=24&scid=437

Here are the dwgs and some files.

Paul Lamar



Hi

Perhaps a cheap source of magnetic pick ups would be abs sensors?

Clive.C


Yes! I think they would work. Any idea what they cost new?
I'll bet they are real cheap at the pick-a-part junk yards.

Paul Lamar