Hello everyone, I'M new to the forum and I own a 91 FSM650e. This is my 3rd fiat 126, I owned 2 126 bis's before.

I'm working on an electronic ignition system with microprocessor advance and dwell control mainly for my fsm but it can be adapted to other cars with points.

I'm also working on a LED tachometer. Both systems work on the table without problems nowadays. I've bought a single cylinder 2 stroke engine for testing purposes. I'll try to control the engine with my electronic ignition and also use my tachometer on it.


is there anybody around who worked or works on a similar system? If there is I'd like to add them to my friends list and exchange ideas etc.

here is a video of my ignition

and an other

I've tried to post videos with no luck as a beginner can not post links in the forum. but if you search "ozkal ozsoy" on youtube, then my page appears and videos of the electronic ignition are a bit down at the page.

see ya

Hi,
I'm starting to look at something similar, maybe a bit more basic than yours. I'm planning to run two coil on plugs and am working an adapter for my distributor to mount these. I have been trying to get some details about the Fiat nanoplex system as this controls the dwell angle using a crankshaft speed + position sensor along with a manifold vacuum sensor I believe, but I've only recently started looking and most of the details are in polish or Italian which I can't read! The nanoplex is a fixed module so there is no option to modify the timing unless another unit is plugged into it to modify the coil output values.


I'm adding a rev counter, but I'm modifying an off the shelf one for an analogue read out.


I can't see any videos on your last post and chance you can upload them again?


Thanks


Michael

Hello Michael,

Nanoplex modules are hard to find here and expensive.

I also made a rev counter recently by using LEDs as the display.

as a novice I'M not able to put links into my posts but if you search youtube for my name: "ozkal ozsoy" then you can easily filnd my channel and see the ignition and led tachometer-rev counter videos.

The rev counter works great on the bench by using the same power supply with my microprocessor based ignition with sparks firing just next to it. But recently I've tested the rev counter on the car and that didn't work out well. The power supply on the car should be much more loaded with ripples and noise, the noise filters etc i've installed on the circuit didn't help and it didn't work well. I'll try to find a scope somewhere and check things and do some more research about automotive electric noise reduction.

My electronic ignition has two versions, first is the simple one which replaces only the points and the condenser. it has a hall sensor and two transistors along with some more protective components. It again works on the bench fine. didn't test it on the car yet.

the other ignition is the microprocessor based one. A small PIC microcontroller looks for crankshaft position via a hall sensor. Also measures rpms with the same input and adjusts the spark timing. It works on the bench fine but won't work on the car as my led tachometer. I need some more info and will do reading about the subject.

lets keep in touch maybe we can cooperate.

Hi guys, I try to ask here.....

I was taking a look to electronic ignition for old engines (500/126).
Here there is a big/old ignition coil (measuring my 500 coil it gives me 8mH for 3 Ohm).
Measuring dwell angle (on distributor) it seems to be 55°, so at 900 rmp I should have about 9ms of ignition coil activation; obviously time would be smaller increasing RPMs...
Taking a look to my Punto 1100, dwell time it's always 2,4ms regardless RPMs, so I suppose to put Punto ignition coil on my 500 engine and keep dwell time to 2,4ms.
Then I discovered I can't exceed nominal/primary current for primary coil, so I'll use current control circuit on ignition coil driver.
How many current?
I can measure ignition coil current, but it depends (obviously) from primary coil resistance, I measured 2,24 and 2,27 Ohm on two different coils.
Now coil datasheet reports it should be 0,54 Ohm (instead 2,24)......
So, I suppose primary resistance would increase due to old coil, so I suppose also inductance will change.
Now, how can get current limit for coil? Should I take care of nominal value reported on datasheet?