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Hall Sensors dying on Holt 75

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michelko:
After the small adjustments it is running fine. no more fried sensors so far.
Here are some pics from the trigger setup.

petertha:
Thanks for the pictures. I've been working on a spreadsheet that calculates some ignition related parameters. I think I understand your shutter type disc/wheel configuration. I have a few questions:

- what is the shutter open window size & magnet diameter it is exposing. Just as an example, 4mm wide window exposing 3mm diameter magnet, 22mm wheel/disc diameter....
- do you have an estimate of your typical idle rpm & max rpm range?
- presumably the trigger wheel is made of steel? What is plate thickness?
- you mentioned you moved the trigger wheel to 0.4mm from sensor, what is the distance between magnet to sensor face?
- when you had difficulties before, do you recall if the engine was at sustained low speed? And now you are basically repeating the run & no further issues?
- does either the Chinese or the MBI module instructions/documents mention anything about a minimum or maximum dwell time?

I don't want to speculate on anything because I am complete novice to this ignition stuff, but just wondering about some things...

michelko:
Hi Peter,
i attached a drawing of the trigger wheel made of mild steel
Idle rpm is about 900rpm, max not measured yet. I believe it would be around 4-5000 rpm.
Distance between Magnet and sensor is aprox 2,2mm, the magnet is a 3mm dia neodym.
No dokumentaion with the chinese ignition.  But they are firing at opening of the window while the transistor ignition is firing at closing.
Just like a kettering Ignition with points and capacitor

Greetings

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