Hi all,

I'd just like to post my progress.  I have sent away for some very slick magnetic switches that are meant for VW ignition conversion.  The kit has a rotor with some magnets on it and and this switch.  I'll need one rotor and two of these switches to form a SPDT switch in the distributor housing.  For now I'm making the stock distributor do this.  The photos below show the stock distributor/points and some modified ignition parts.  The modified one is not finished but I'll explain my plans.  I posted both stock and modified for comparison. 

The stock points breaker arm (riding on the cam lobes) will be the common pole of the SPDT switch.  Each of the phenolic blocks will have a springy phosphor-bronze leaf contact and each with separate wires leading out of the housing ... including the common wire ... no condenser.  So the common will contact one leaf contact or the other ... not both.   Timing and vacuum advance stay intact.  That's it for what it takes to run the Plasma CDI design I'm building. 

Peace,

Greg

Quote from: insane4evr on September 21, 2008, 05:18:33 PM
@ Groundloop,

Thanks.
So, does that mean that for a 4-cylinder engine, the RPM of the distributor is the same as the main shaft?

The distributor is connected to the camshaft, usually by meshing of gears. The crankshaft is connected to the camshaft, usually with gears and a chain or belt of some kind. The crankshaft turns 2 times to every 1 time of the camshaft, in your typical IC engine.

@Groundloop and michaelpaul,

Thanks. So, in a 4-stroke engine, if the repetition rate of a spark of one cylinder is every 42.5 milliseconds, then:

F=1/T = 1/.0425 = 23.529 Hz or rps.
23.529 x 60 = 1411 distributor RPM
1411 x 2 = 2822 crankshaft RPM. Correct? I hope I am learning thus stuff.

Quote from: insane4evr on September 21, 2008, 11:22:57 PM
@Groundloop and michaelpaul,

Thanks. So, in a 4-stroke engine, if the repetition rate of a spark of one cylinder is every 42.5 milliseconds, then:

F=1/T = 1/.0425 = 23.529 Hz or rps.
23.529 x 60 = 1411 distributor RPM
1411 x 2 = 2822 crankshaft RPM. Correct? I hope I am learning thus stuff.

Your math is correct.
Mike

Quote from: Aka on September 19, 2008, 11:30:59 AM
I have remade the Nexus diagram as requested by Luc with the changes

adding every single diode made the image far too complex so its just image and description changes

the blank area on the left may be large enough for a parts list when we get the info

@Luc

please delete the image if anything is incorrect... I wasn't sure about the half wave bridge rectifier as on the original it said 3 to 5 1N5408 but you mentioned 4 diodes in series so I drew the diodes in the same direction as on the original and drew the diodes like the others to show them in series

EDIT: changed font error and size of image

Been watching from the sidelines but felt the need to jump in and ask some questions regarding Bill's Nexus circuit.

1. If the output from the MOT is connected to engine ground, and engine ground is connected to the minus terminal of the battery - are they not the same electrical potential? Why does bill say to connect the capacitor to minus battery terminal and NOT the output of the MOT. It seems to me that the circuit would work either way. What am I missing here?

2. The inverter is marked NEU and HOT on the output. Since the output is an AC voltage how do the terms NEU and HOT apply?

My cousin and I created the nexus circuit and tried it on one plug removed from my 1996 Geo Metro  - just as Bill demonstrated in his video. With the engine running and the 400 watt inverter turned off there was no spark at the plug. When I removed the DC connection (60 1N5408's) then the HV spark showed up. That should have been my first clue. I connected the 120V DC back to the plug and turned the Inverter on.....Instant smoke! I am now a member of the fried inverter club

I will try the simple dual LED trick posted earlier to determine whether I have a negative or positive HV spike and connect the diodes accordingly. I believe this is a crucial step in getting the Nexus circuit to work - and to keep from frying inverters!

Cheers,
Tom