[DML] Re: Bolt On Performance.

["content22207" <brobertson@xxxxxxxxxxxx>]

Come on Martin, you know that you can't run aggressive ignition
(advance and plug gap as well as spark energy) on forced induction.
Even high compression gets dicey. MSD modules can compensate for turbo
boost, if I'm not mistaken.

Probably the only way manufacturers were able to get away with 10,000
volt ignition in the 1960's were 10:1 and 11:1 compression ratios that
prevailed. Timing was much closer to TDC as well. That may be one
reason GM pursued HEI in the 70's. Compression ratios dropped
precipitously, and spark moved closer to the bottom of the cylinder
for emissions. Basic engines didn't change a lick, however (every
domestic engine used in the 70's was a dumbed down 60's design, with
various bolt on emissions devices). I know my 1977-1979 Ford products
are much happier with high voltage ignition than the original coils (I
do retain the Duraspark modules). Everything changed radically in the
80's, but HEI may have been a necessity in the 70's.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@...> wrote:
>
> I can tell you that a stock original coil runs the spark quite happily 
> on #2727's Renault turbo engine at 1.2 bar of boost. A so-called 
> "performance" coil started misfiring at about 4psi...
> 
> Martin
> 




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