FS: trigger wheel system for type 4, Megasquirt, $120 shipped |
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FS: trigger wheel system for type 4, Megasquirt, $120 shipped |
jarred |
Jan 9 2015, 04:43 PM
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#1
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Newbie Group: Members Posts: 20 Joined: 13-March 09 From: seattle Member No.: 10,159 Region Association: Pacific Northwest |
Designed these for my 914 and bus megasquirt projects but built a batch of 10 while I was at it in case anyone else found them useful. Specifics...
This is a 24-2 trigger wheel and sensor that mounts inside a Bosch distributor (009, 035, 050, etc) and uses a Hall effect pickup to generate a trigger signal for coil on plug or wasted spark ignition systems. Installs in 5 minutes and is much more discrete than all of those on crank 36-1 VR based systems with the brackets, etc. Tested on VW/Porsche type 4, VW type 1, and Porsche 356 and 912 engines, but will fit a broad range of Bosch 4 cylinder distributors. Can parallel two wasted spark coil packs for twin plug applications. I recommend the VW 2.0 coil pack VAG part 032905106B/032905106E which fires with logic level signals rather than requiring ignitors. Uses the Allegro 617 hall effect sensor. This sensor is internally pulled up to the power supply with a 10k resistor, so if you need a 5 volt square wave output (logic level) then power it with five volts. Need 12V? Power it with 12 Volts. 3 wires, power ground and signal all in a shielded cable ~5 feet in length. Wheel is a 24-2 which looks like a 12-1 on the crank. Will work with most Megasquirts but please do your research. I currently have 10 in stock and ready to ship. |
jarred |
Jan 11 2015, 11:06 AM
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#2
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Newbie Group: Members Posts: 20 Joined: 13-March 09 From: seattle Member No.: 10,159 Region Association: Pacific Northwest |
My system can't do it; it was designed to replace the points/rotor/cap for ignition triggering (and modern FI sync). Just browsing the d-jet into on the web it looks like the FI points/switches are down in the base of the distributor. It would be interesting to see if you could use two hall effect sensors to drive IGBT's that would then switch the injectors to ground instead of those mechanical points. Just depends on whether the cam on the distributor shaft would give a consistent trigger signal. It might need to be ground into a more square profile similar to a trigger wheel (wouldn't have to be exact). Lot of work just to modify a small part of a very antiquated injection system. Is there really a need out there for this?
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Mueller |
Jan 11 2015, 11:11 AM
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#3
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914 Freak! Group: Members Posts: 17,150 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
My system can't do it; it was designed to replace the points/rotor/cap for ignition triggering (and modern FI sync). Just browsing the d-jet into on the web it looks like the FI points/switches are down in the base of the distributor. It would be interesting to see if you could use two hall effect sensors to drive IGBT's that would then switch the injectors to ground instead of those mechanical points. Just depends on whether the cam on the distributor shaft would give a consistent trigger signal. It might need to be ground into a more square profile similar to a trigger wheel (wouldn't have to be exact). Lot of work just to modify a small part of a very antiquated injection system. Is there really a need out there for this? Hi Jarred, see link right above your post...I made this circuit many moons ago and it did work, I think there is very small market...I had some interest from some Volvo guys that had D-jet as well, but never followed thru. Feel free to pursue it further if you'd like, I no longer have a car or parts to test this out on and have plenty of other things to keep me busy right now. |
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