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Hi. Due a short circuit on my original coil, I going trought some experiments on my amazon.
I post on bboard, and some members suggest use a blue bosch coil - a red one would be too much for a set of points. Agree.
First, I put a blue coil with 7 mm standard wires. Run a lot best than the shorted original coil, but remain some rough at idle and a bit of misfire at 5000 or more rpm (B18A engine, one ZS175 carb, C camshaft, overhauled).
Also, due some bobble on my dizzie, I adapt a electronic ignition into it (original a taiwaneese accufire, after a US compufire unit, both available for 009 distrib on VW stores, simple devices, no need additional changes, advance rely on the gadgtes of the distributor; I believe Pertronix is a evolutionated version of that simple low cost devices). After my first unit was fried due a short (my mistake) I have a replacement on my toolbox.
Due I have a brazilian red coil (and the ignition don't use points now), as a next step I change the coil and add a 0.8 omhs resistor (as the red coil instructions state). No more misfire at high rpm, but rough idle remain aboard.
After reading about procedures for reduce emission (to pass local tests, my crux), I open the sparks from 0.028-0.032 to 0.032-0.038, voila!, the idle are firm and "round" (after read on some ignition handbooks, the double voltage of the red coil help to jump on more spaced spark points).
Also, as a measure to reduce the electrical lost (the wires bright at midnight), I change the wires to old style solid copper. Also, I close the rubber covers of the wires (at the side contacting the wire) con gasket sealer.
No more midnight lights on the car, but now I ear the "fried-eggs-sound-band" on my radio. After read a article on Popular Mechanics, I return to carbon wire for the wire from the coil to the distributor - the wires from distributor to sparks remain on solid copper. Radio sound acceptable now (good FM, regular AM, I ear usually only news on the car).
This is only a single case, I'm not sure would be possible replicated it on other one. At last, it work for me.
Happy volving
Joaquin
Rojo 121 Amazon
Lima - Peru
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