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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
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Originally Posted by wwest View Post
Yes, the SCR in the CDI is self-firing due to the alternator charging voltage voltage (not necessarily the battery voltage too) being too high, the tach bounces due to the extra firing pulses, sometimes the extra firing pulses are high enough to trip the engine rev limiter.....BANG!

The rev limiter locks up, also due to the high voltage, and you cannot restart the engine until the ignition is switched off for long enough to "unlatch" the rev limiter. In my case that was a slow count to 5.
Get an MSD vs. the stock CDI. My MSD just laughs at the overcharging voltages I see occasionally. Of course, it may not laugh forever....
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 09-29-2011, 10:40 AM
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