Sounds like you know what your talking about ! You might want to go to MSD s website. A ballest resister doesn't effect spark performance in anyway, it is for lack of better wording a inline fuse.
I "not" douting you know what your talking about. If it made for a weaker spark then what would the point of it be?
Hotter coils are used to burn fuel better. Yes we open gaps on plugs bigger with hotter spark but not with out a CDI.
[CDI] the red box MSD sells. Under high rpm compression puts spark "out", CDI won't let that happen so a bigger gap can be used. [fact]
If a ballest resister made for a weaker spark why the hell did they put them on every HEMI car or wedge car i have ever driven or seen.
Automotive coils with out a ballest resister on tractors can cause problems ! It cost me a eletronic ign , it burned the eletronic pick up right out of the dist. Petronics told me to put a ballest resister in next time due to the auto coil.
There is no doubting you know the theory on how it all works, but not in this case.
I have a brand new wireing harness in the tractor as well so that there wasn't any chance of there being a unseen problem.
I have sence installed the MSD 6al CDI box and openeed up the plug gap to .050 and it runs great. And guess what MSD wants that ballest resister in place.
I only spin this motor around 1800 rpm with 240 psi cylinder presure , this by no means is a big harry pulling motor. Good clean spark helps these old tractor motors out alot.
The cylinder combustion chamber design on 60 year old tractors is very poor , so anything you can do to make for a better burn can only help .
John i'm not taking a shot at you , i'm just passing on what i have learned and been told from the companys that sell the products.
Remember when Chrysler tried out there first computers on the cars" lean burn" in the late 70s. WOW was that a flop
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