threewood
Well-Known Member
You guys are lucky having all those car shows so close. I am lined up this weekend with a few dates and horse riding or I would drive down. I just washed my car too!
1968 Coronet 500 Project
- Thread starter JimKueneman
- Start date
JimKueneman
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JimKueneman
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Went to a show with Bill and his RoadRunner today. No trophies but nice Mopars and cooler weather. The RR Vert is a modern Hemi not original.
JimKueneman
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Few more
JimKueneman
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Maybe I'll just go to the Karchner Caverns show down the road next Saturday...
JimKueneman
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Day one of the Pertronix ignition upgrade. The plate screws are drilled and tapped for #8-32's... my distributor has #10-32 screws holding the plate and I did not have a #10-32 tap in the tool box. Need to stop at Ace tonight. The plate is also made of Chinesium pot metal, one little pry and a small corner snapped off. It is going exactly how I expect aftermarket upgrades to go..... I am sure the multiple spark feature will screw up the FiTech so I am also prepared to design an updated filter as well.
EngineerDoug
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Hey Jim,
Thanks! That helps a lot. I appreciate it.
Thanks! That helps a lot. I appreciate it.
threewood
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Did the kit not come with new screws? Same issue with mine on the screws but they had some included.
JimKueneman
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I don’t know it’s probably in the garbage can with the instructions!
Glenwood
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Instructions? Never heard of them.
threewood
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Oh, and don't use an advance light with the Pertronix III because it won't work. Use an old school induction light.
Pic of mine. Notice the ground strap goes down between the plate and body.
Pic of mine. Notice the ground strap goes down between the plate and body.
threewood
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JimKueneman
Well-Known Member
Crap did not think about that. Not sure if I follow, aren't they all induction?
threewood
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Well, the newer advance lights go wonky. I switched to an old Sears light and it worked. So it might just be advance lights. Same issue with MSD ignitions.
JimKueneman
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I have a really old Snap-On with a dial on the back to move the advance
JimKueneman
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Yup the multi spark totally wonks out the FiTech reading the RPM. I took a guess at what the multi spark would look like and had a circuit ready. The guess was wrong and the circuit failed but I now have scope shots of how the multi spark is implemented so I can simulate a design a circuit. It is going to be a bit more complicated than the one I had originally to protect the FiTech from the points for sure.....
Ye ol'debounce circuit might be the trick. I just designed and qualified a debounce circuit using 4 2N7002 FETs and a R-C. Takes an erratic train of 3us pulses and outputs a 120ms single pulse. Works from 9-30V and -40 to +70C. PM, or call me if you want a breadboard to try out.
JimKueneman
Well-Known Member
Need to take 2 20us or so pulses (clamped at 12V) spaced about 150us apart and make them a single pulse at over 8V.
You could do a NAND gate debounce, but will need to keep voltage fairly stable. The problem with my circuit is you stretch the second pulse, and you probably want a solid 150us single pulse. One Shot LM555 might work?
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