Electronic ignition thread / High Voltage / Forums

Forums

4hv.org :: Forums :: High Voltage

« Previous topic | Next topic »

Electronic ignition thread

first previous 9 10 11 12 next last

Move Thread

LAN_403

paris

Thu Jun 27 2013, 08:11AM

Registered Member #3042 Joined: Wed Jul 28 2010, 12:36AM
Location:
Posts: 121

your right , I went and got one pulled it apart , dont know what its from , 80s jap car.
wanted to see for myself whats in there .

with ford model T it had a fly wheel magneto with 16 coils so at 1000 rpm , 16 x 1000 / 60 = 266 hz , that went to a comutator on the cam shaft (1/2 speed) from there it went to 4 individual trembler coils each being triggered on , but also the 266 hz is running thru primary so the spark plugs have multi sparks, crude version of what your after.

also the comutator body was connected to a lever onto the steering column for adv retard.
Ive got T fly wheel mag set up Im flogging off at the moment ,weighs 22 kg!!
16 pan cake coils in series.

another idea is twin plug on each cyl but then I spose the racing rules dont allow that for classic racing ,best idea = joe hunt or morris but thats rediculous money

Ash Small

Thu Jun 27 2013, 02:33PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

paris wrote ...

another idea is twin plug on each cyl but then I spose the racing rules dont allow that for classic racing ,best idea = joe hunt or morris but thats rediculous money

Not a lot of room for any more plugs

I wasn't actually planning on racing it, but after last weekend.............

I've run magnetos before, but if I can build something out of a MO inverter and an SiC fet, plus a couple of 555's, which sits on the plug, and is fed ~300V from a small SMPS, with maybe a couple of smoothing caps, it should be lighter than a mag and I'll have less rotating mass.

Ash Small

Fri Jun 28 2013, 09:52PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

Carburettors arrived this morning, I've just designed some manifolds, but will have to wait until my lathe is here before I machine them.

paris

Fri Jun 28 2013, 10:44PM

Registered Member #3042 Joined: Wed Jul 28 2010, 12:36AM
Location:
Posts: 121

hmmm....... 2 cyl / 8 valve / su carb bowls indicate cylinder bank leans forward..... wait and see

Ash Small

Fri Jun 28 2013, 11:22PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

paris wrote ...

hmmm....... 2 cyl / 8 valve / su carb bowls indicate cylinder bank leans forward..... wait and see

Those particular carbs will allow me to tilt the engine foreward if I decide to. I have the figure of 15 degrees in mind, but I'm still undecided.

On the subject of 'foreward leaning engines', here's another 'mad' photo from last weekend:

Ash Small

Wed Jul 03 2013, 10:09AM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

The Champion G63 spark plugs arrived this morning

These are un-suppressed racing plugs.

Now I can start making some sparks

paris

Fri Jul 05 2013, 09:30AM

Registered Member #3042 Joined: Wed Jul 28 2010, 12:36AM
Location:
Posts: 121

those are long and no ribs. Are you using flywheel sensor then ? Im guessing the motors in pieces.

Ash Small

Fri Jul 05 2013, 10:37PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

paris wrote ...

those are long and no ribs. Are you using flywheel sensor then ? Im guessing the motors in pieces.

Yes, I bought the motor in bits. It seems to be standard practice around here, so you can see exactly what you're buying. I had a choice with some of the parts as well, other cranks, nikasil barrels, and different heads were offered to me. I basically picked the parts I wanted. I've pretty much got everything for the engine now, except the ignition system.

Ignition was previously driven from the exhaust camshaft. The interspan pickups are still there, but configured for a 360 degree crank rather than the 180 degree crank I have.

The plugs are quite long, but the head is pretty thick, and they are angled slightly in the head.

I found this article from 1970 on CDI ignition, which is quite interesting:

Ash Small

Sat Dec 14 2013, 10:59PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

I picked up a clutch for it today, if anyone is still following this thread:

EDIT: If anyone is looking for anything similar, maybe BSA, Norton, Triumph, Godden, Weslake, etc (can obviously be made to fit anything), 'The Man' has a pile of blanks waiting to be machined. As well as diaphragm, four and six spring versions are also available, along with a smaller, lighter version.Maybe I'll post pics of the sealed bearing later. PM for more details.

(sealed bearing)

paris

Sun Dec 15 2013, 01:44AM

Registered Member #3042 Joined: Wed Jul 28 2010, 12:36AM
Location:
Posts: 121

"the man" is pretty good!! .....been wondering about the ign circuit , I was not keen to see 2n3055 .
in mean time I went and got a splitdorf mag = 4.5kg spark plug :0)

first previous 9 10 11 12 next last

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob