New coils for an SF2

Those car coils are very robust, might save a few ounces to change, but if you realy do need new coils get some from a classic VW Beetle dealer.
CLEM
 
Original Bosch coils are gun units, Marty. I kept mine even when I went to a Suzuki ND elec conversion. But I'd expect any coil with the right ohmage will work with the points and condensers.
 
The original Bosch coils last forever. No advantage with replacing them unless you want to save a little bit of weight. I would not be surprised if they also give a bigger spark than the TEK coils. If you are determined to replace them, electrically they are wired the same as the Bosch ones. The points and condensors don't care about what brand of coil you use as long as it is 3 Ohms.
 
I learned a new word from this thread - "ohmage" :)
(most people call it resistance)

BTW Marty, if your coil is really 3000 Ohms, then I think a replacement is justified. I'd expect it to be around 3 Ohms.
Maybe you had your meter on the mΩ (milliohm) scale.
 
You could have 2 lobes and 2 sets of points. Then twin-plug the head so you have two completely independent ignition systems.
Nothing like a bit of redundancy to improve reliability. I think some small piston engined aircraft have dual ignition systems (two magnetos).
 
Yes cam, dual magnetos, part of the pre flight check is turn turn one off and then the other.
Bentley ran dual ignition for a while, points and magneto, dual plug head, points and coil worked one set, maggy ran the other.
 
Some old multi-cylinder aircraft (especially radial engines) would have a hand-cranked magneto for starting. Before hopping into the cockpit, the pilot would turn the propellor over by hand to suck in a fresh charge of fuel. Then he'd strap himself in and crank the magneto which would fire all the plugs. One of the pistons will be somewhere in its power stroke, so when that plug fired it would kick the engine into life. No starter motor required.

When I was a little kid in primary school, my much older brother Bob (now deceased) was studying aeronautical engineering and used to fly light aircraft like Tiger Moths. He scrounged one of those old hand-crank magnetos from an aircraft workshop somewhere. It had a couple of wire tails hanging out of it. He told me to hold onto the wires while he cranked the handle. I was expecting a barely noticeable tingle of electricity, but I got such a jolt that I nearly jumped out of my skin. I wasn't too happy about it until he gave it to me. I took it to school and zapped several other kids with it. I don't remember what became of it, but I suspect my dad might have confiscated it.
 
A mate once used a rubber sanding disc attached to a push bike lighting dynamo and suggested I touch the pole.I only did it once that ccurry me of do in what mates suggest
 
You must log in or register to reply here.
Back
Top