This coil was on my 65' s.b. when I got it. Does anyone know what the 293 was intended for?
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Re: 293 Coil?
If I'm not mistaken, it's the part number. Coils only carried the last three digits of the part number. According to my trusty NCRS Pocket Spec Guide (only goes to 1967, sorry), it should be 202 for base engines and 203 for TI cars. I've been told they don't interchange, but some of the more knowledgable posters can confirm this. Bill Braun 33186 -
Re: 293 Coil?
Bob ---- Don't know what GM cars it was originally specified for, but I've seen them on 70's vintage V-8's in the scrap yards (picked up a few myself). Believe they were one of the last coils prior to the switch to HEI system. The full part # is 1115293, and the abreviation (as Bill has mentioned) is debossed on the coil can. For this particular coil, the 3 digits are high on the can, and the letters "B - R" are debossed immediately under the numbers. These letters stand for ballast resistor (think it means ballast resistor REQUIRED, either as part of the wiring, or separate). Don't know the spec's, but can vouch for the fact they work perfectly as a replacement for the mid-year "202"s.Comment
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Re: 293 Coil?
Agree. You'll see LOTS of BR-293 on Shark era passenger cars in the scrap yards. Finding the Corvette BR-270 (SB) and BR-287 (BB) coil is the art of the hunt!
As far as 'ballast resistor' goes, discrete ballast resistors (those mounted on firewall) ended in '68 timeframe (think this is the right year) and the function of the ballast resistor was built into the engine wiring harness (controlled resistance added via wire gauge changes, in-inline crimp/splice, and controlled length of wiring).
If you've had the fun of pulling apart some of these coils as I have, you see a theme. Earlier coils without 'BR' designation have solid continuous transformer core laminations. The 'BR' units have tiny break in magnetic core (gap) with plastic inserts -- appears primary to secondary magnetic coupling was being controlled....Comment
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