ESE's works engine tuner

[philou]

if the transfer ports and the blowdown are not granted, there is no point in enlarging the admission.

for admission, I am inspired by the kart rotax max cylinder.

[Javier Ruda]

for admission, I am inspired by the kart rotax max cylinder.

I see. Bigger Boyessen ports with a “sky jump” down to the crankcase. I seems doable.

[philou]

cdi ignitech on SEM ignition for rotax 122 Aprilia RS.

the pick-up is inside the flywheel and triggers on 2 magnets side by side.

the oscilloscope gives 2 sinusoids for the top sensor.

ignitech indicates that their cdi works on this ignition. without further indications.

now the bike starts. but can't find a configuration that works.
the cdi is a P2-race.

do you have an idea of configuration?

[Javier Ruda]

the cdi is a P2-race

From IGNITECH website, P2 is for 2 cylinders. It seems the pick up is “reading” the 2 magnets.

I have Zeeltronic, and you have to input there the static advance angle. That is the position of the pick up vs tdc.

Edit: original pick up on Rotax 122 is 36° before TDC and Zeeltronic has a “compensation” of 30 us (microseconds). Compensation is like a fixed delay.

[philou]

several configurations have been tested.

ignition is erratic. clearly visible under the strobe light.

spark plug and cap with resistor.

ignition of the 123 is different from the 122

[Javier Ruda]

several configurations have been tested.

ignition is erratic. clearly visible under the strobe light.

Bonsoir philou, this is how to match flywheel and stator, from rotax 123 service manual. Your layout seems very different, it may be difficult to follow the procedure.

[wobbly]

It does not matter that the CDI is a P2 - just turn off the second channel and it will operate as a single.
The input trigger system I have my doubts it will work.
The CDI input works when it sees a dropping voltage from the trigger pass thru zero volts - and having two magnets side by side with a pair of close signals one after the other
is not what was designed for at all.

In fact all Ignitech DC DCCDI are designed to use a normal reluctor pickup , that has a magnet surrounded by the coil , and a voltage is generated by a non magnetic trigger lobe on the flywheel.
Having magnets inside ( or outside ) only works with Hall Effect sensors , and this setup has to be ordered as a special input from the factory - only 4Ts use this usually.
This input is not switchable between the two systems , its one or the other.
The Ignitech has a similar input setup to a Zeel , except the Ignitech uses a base advance of the actual trigger firing position BTDC - the Zeel must have a base advance greater than the max advance in the curve.

[philou]

it is indeed an inductive sensor that is used. Not hall sensor.

zeeltronic does not want to bother with SEM ignitions.

I guess that the passage of the 2 magnets side by side gives 2 top too close and that the case is lost

I tested all possible configurations and no change





Édit : ignitech provides an add-on for the SEM.



I have to check if I have correctly connected the blue wire of the case with the black ground of the stator.
the load coils being on the same part as the pick-up. maybe my problem comes from there.

[wobbly]

That is very wierd then , as only Hall Effect triggers use a magnet in the flywheel - an inductive trigger will not work correctly using magnets.
There is a way of programming a two lobe / close gap input.
The factory did one for me when splitting the second lobe in 1/2 on an RD400 to get rid of the wasted spark.
But that is on a very old hard drive somewhere - its done by creating a " virtual single lobe ".

[philou]

a gutted SEM stator.

the pickup is just a winding on the same metal frame as the CDI charging coils.

I will check my wiring. maybe i did shit
I retain the idea of the virtual single lobe.

[Muciek]

You will probably need a circuit to convert that pickup signal into the normal like pickup coil ". Friend did work with ktm lc4 with sem ignition and he was fighting with that too (he made cdi replacements with 2 ign curves)

[husaberg]

You will probably need a circuit to convert that pickup signal into the normal like pickup coil ". Friend did work with ktm lc4 with sem ignition and he was fighting with that too (he made cdi replacements with 2 ign curves)

i wouldn't be surprised if he couldn't have put on a later Husaberg with that already.
i know my old 01 501 does. pretty sure it SEM as well.

[Muciek]

i wouldn't be surprised if he couldn't have put on a later Husaberg with that already.
i know my old 01 501 does. pretty sure it SEM as well.

He was selling DC CDI replacement for the older SEM ones , because HV charging coils were getting old and failed in the stator (sometimes it was CDI box or both of them ). KTM had 12v rectifier and big capacitor that was enough to get it easily (if you could name it that way) started .

[philou]

an American offers the SEM stator rewinding service.
apparently with success.

his observation is that the quality of the original thread is crap.

ignitech tells me that their boxes work with it.
I explained the problem to them.
at the strobe light, the cdi is lost. ignition timing is completely random, with variations of over 45 degrees leading and lagging.

[Niels Abildgaard]

he second lobe in 1/2 on an RD400 to get rid of the wasted spark.
".

Excuse my ignorance,but what was benefit of getting rid of wasted spark?