hall switches for MS&S-extra trigger

[frank280zx]

I thought only xander was wasted from als those watery french 'yellow' milk`

 

I sat in his car, adn apart from his Idle, the thing ran pretty strong, especially since he was only running 7psi ( OK OK maybe the sandblasting grit in your vent system adds to the thrill by you having to close your eyes on full boost )

I'm very curious to see where it will lead under 10 or even 15 psi !! since he has teh flat top pistons !!

[Jolane]

I don't know how I did not see this thread. Good work on the sensors. I just completed my Master's Degree and for my project I built a Distributorless ignition system (DIS) from scratch using an 8051. I used a SBC for my subject engine. I also designed and fabricated all the sensors brackets, trigger wheels, etc... a lot of work. Maybe listing what I did will help someone else, or give some other ideas...

I made an aluminum trigger wheel that mounted to my harnomic balancer. It bolted between the pulley and the balancer, with effectively no added thickness to misalign the pulley. It was pinned into place, and the pulley clamped down and held the trigger wheel against the balancer. For a sensor I used a Cherry Hall Effect. It is an industrial piece, already packaged in a very nice threaded case. It is internally biased, so the triggers need to be ferrous metal (steel), instead of magnets. I made sure to secure the triggers into the wheel securely so they did not come loose over time.

This sensor was very easy to use, including mounting, and is very durable. It is also a little more pricey at ~$28 at Digikey, but heck, the wires are already attached. Just use a good weatherpak connector and you are set.

I know the debates about using steel targets versus magnets, and really do not feel that magnets offer much more in "safety" from false triggering. It is also easier to machine steel than magnets, and the total cost is probably a wash in the end.

I would not hesitate to use a crankshaft trigger mounted on the front of the engine, as long as the belts are not near the sensor (in case one breaks). I do think that one mounted in the bellhousing would tend to get dirty from clutch dust, but the sensor is probably better protected from everything else. I think the real ease comes in making the trigger wheel and sensor bracket. Seems easier to make one from the front of an engine.

I am interested to see how your setup works out. Having a good cranking signal is an excellent sign!

Good Luck!

Joshua

[Xander]

Those cherry brand sensors are nice. If I would have known about them before then I would have bought one of those instead. They have a magnetic version also. So I could replace the one I have got in the future.