QUOTE(kart54 @ Jan 17 2007, 02:04 PM)
I posted this in the garage section and got no response so I thgought I would try here. Working on the race car last night I flipped my main power switch to test something else I was doing. After a couple of minutes I heard the oil in the coil making noise. When I jumped out of the cockpit and went to the engine compartment I found the coil was so hot it burned my fingers.
What will cause a coil to burn like that? Is it a fault within the coil itself or something external?
The coil was an MSD blaster 2 and my ignition is a Crane XR700 optical with rev limiter.
I went out today and got a new coil but I want to make sure I'm not going to fry this one as well by just installing it. Anything I should check first?
Any help greatly appreciated.
Thanks
Randy
Randy, coils should be switched only with the ignition and pretty much that means the car should be starting. By leaving the coil on with 12v running into it and nothing to break the ground (the coil was able to ground out to a spark plug because the dist wasn't turning), the outter windings were sitting at 40,000V and began boiling the oil inside it. At that point it is fried quite literally.
Make sure you only power the coil when you are actually ready to start the car in the future. I have a toggle switch mounted right by my key - I turn the key to run the engine on the starter until oil pressure comes up, then while still holding the key I flick the switch with my index finger to relay 12V to both the coil and the ignition box and the car fires up.
edited to clear up bad previous editing - hahah