Search found 95 matches

by BRUCEROE
Fri Aug 06, 2010 3:01 pm
Forum: Q&A
Topic: rotary megajolt
Replies: 27
Views: 32717

Agreed, disregard my comments about radial aircraft (not rotary) engines. Bruce Roe
by BRUCEROE
Fri Aug 06, 2010 3:26 am
Forum: Q&A
Topic: rotary megajolt
Replies: 27
Views: 32717

I may be entirely off track here, thinking of a radial engine. A 3 cylinder engine will have firing intervals at multiples of 120 degrees,
won't it? Then you may have a possibiity. Just what it the firing interval, will the engine work with waste fire? Bruce Roe
by BRUCEROE
Wed Aug 04, 2010 8:14 pm
Forum: Q&A
Topic: rotary megajolt
Replies: 27
Views: 32717

Even with dual plugs per cylinder, you can't use the same coil to fire them. An EDIS coil drives 2 plugs which reach TDC at the same time. But the expectation is that one is a compression stroke needing a lot of spark energy, and the other is an exhaust stroke needing minimal energy. 2 plugs on the ...
by BRUCEROE
Wed Aug 04, 2010 4:09 am
Forum: Q&A
Topic: rotary megajolt
Replies: 27
Views: 32717

The MJLJ-EDIS can operate engines with a 90, 120, or 180 degrees crank rotation between power strokes, or multiples of these. That doesn't usually work on a radial with an odd number of cylinders. If you don't have 2 cylinders reaching TDC at the same time, it would take twice as many coils. Bruce Roe
by BRUCEROE
Wed Jul 28, 2010 9:48 pm
Forum: Q&A
Topic: TPS specification
Replies: 2
Views: 2437

The usual way to use a TPS, is apply +5V and ground to your pins 1 & 4. Then sense voltage out to the MJ from 2 or 3. Th MJ can supply the +5V. Exact resistance not important. Bruce Roe
by BRUCEROE
Wed Jul 21, 2010 2:57 pm
Forum: Assembly
Topic: Hardware revlimiter fried
Replies: 14
Views: 12985

Engine

If its not a straight 4, what is the configuration? On my 2 cyl I used a V8 EDIS, because the 90 degree angle between cylinders was the same as a V8. Bruce Roe
by BRUCEROE
Thu Jul 15, 2010 4:58 am
Forum: Installation
Topic: Installation with no alternator
Replies: 2
Views: 2272

POWER

Go to the OPERATION section, BATTERY CURRENT FOR EDIS April 2010. The EDIS uses electronic dwell control, so it only takes the current needed to charge the coil(s) each revolution. Current increases with rpm, of course. Much more efficient than a points system, that burns up extra power in a ballast...
by BRUCEROE
Wed Jul 14, 2010 10:56 pm
Forum: Installation
Topic: Testing coilpack input?
Replies: 5
Views: 3297

Funky Diver recommends a good test, because it will find shorted turns or breaking down insulation that won't show up with an ohm meter. If a couple plugs don't spark, switch the EDIS coil driver wires. If the same plugs don't spark, its the coil. If different plugs, its the EDIS driver output. Bruc...
by BRUCEROE
Tue Jul 06, 2010 9:14 pm
Forum: Installation
Topic: TPS on SU carbs
Replies: 6
Views: 4919

If you can get reliable & repeatable output, a reduced rotation TPS would work. Either calibrate the controller for a lower range of voltages, or use an OP AMP to boost voltage back up to nominal levels. Bruce Roe
by BRUCEROE
Tue Jun 29, 2010 4:24 pm
Forum: Operation
Topic: Timing way out
Replies: 7
Views: 5669

Can't see the trigger wheel setup, is this a factory thing? The phasing appears OK, the "double hole" is where the missing tooth is? The wiring checks, reasonable VR gap with wires shielded & not reversed? I'd take the plugs out but wires still connected, wire the bases to ground. Unplug the MJLJ so...
by BRUCEROE
Tue Jun 29, 2010 3:44 pm
Forum: Powered by Megajolt Gallery
Topic: My 1380 mini
Replies: 5
Views: 14156

Great work, nice pictures. Did you remove one tooth from the trigger wheel before installing the engine? Bruce Roe
by BRUCEROE
Tue Jun 29, 2010 4:28 am
Forum: Operation
Topic: Timing way out
Replies: 7
Views: 5669

Do you have a 36 - 1 tooth trigger wheel pattern for the VR? The only thing visible in the picture is starter gear teeth. Bruce Roe
by BRUCEROE
Mon Jun 28, 2010 1:17 am
Forum: Operation
Topic: Timing way out
Replies: 7
Views: 5669

Are you running an EDIS4? Can you show a picture of the relation of the VR to the trigger wheel when cylinder 1 is at TDC? Bruce Roe
by BRUCEROE
Sun Jun 20, 2010 1:55 am
Forum: Operation
Topic: 1 cyl. motorcycle missfiring from in and ex
Replies: 16
Views: 9946

If running a single cylinder on a dual output coil, the other output of the coil must be grounded to complete the plug circuit. Bruce Roe
by BRUCEROE
Fri Jun 18, 2010 4:16 pm
Forum: Operation
Topic: Map conversion: TPS --> MAP? And MAP load bins?
Replies: 1
Views: 2050

TPS to MAP

A MAP is better if your setup can use it. The engine torque is pretty much proportional to Manifold Absolute Pressure. But Throttle Position has a very poor relation to torque. First the restriction isn't a linear relation. Then, it only takes a little throttle for max torque at low rpm, but max thr...