[Fot] Ignition coil for 6 cylinder with points (racing)

[Jason Sukey]

Thanks for all the ignition advice over the past few days.  No more fooling
around, I just ordered a 123Tune USB distributor.  Yet one more racing
problem solved by throwing $ at it. :)

Jason

On Wed, Sep 11, 2019 at 8:20 AM fubog1 via Fot <fot at autox.team.net> wrote:

> I agree, a lot of electrons going through there, and the red plastic
> rubbing block on the modern points has its limit.
> Points are fine on a 4-cylinder engine, if all is kept in order, but a
> 6-cylinder at those revs is pretty much at the limit; it has to do with
> coil saturation time, the amount of time that the points are closed.
> There's a limit to how fast the points can be made to open and close, just
> like a cam/valve action, and the modern optical & magnetic units are
> instantaneous and allow max saturation time for a good spark.
> A 6-cylinder @ those revs would likely benefit from a modern unit.
> Glen
>
>
> -----Original Message-----
> From: Bill Tobin via Fot <fot at autox.team.net>
> To: fot <fot at autox.team.net>
> Sent: Mon, Sep 9, 2019 1:18 pm
> Subject: Re: [Fot] Ignition coil for 6 cylinder with points (racing)
>
> Jason, sounds like you have too much current going through the points.
> Maybe try an external ballast resistor. (Ask me how I learned this!).
> Why not go Pertronix or other pointless distributors? KISS. But always
> carry a spare!
> Cheers, Bill
> On 9/9/2019 11:07 AM, Jason Sukey via Fot wrote:
>
> Had a wonderful time at the Glen, still chasing some gremlins, but getting
> closer!
>
> I've been struggling with points on my GT6, before I throw them away and
> buy a 123tune dizzy, I'd like to survey the other 6 cylinder guys to see if
> anyone has found a good setup that works with points.
>
> My engine is about 12.5:1 compression, typically shifting just under 7000
> rpm, but will rev to 7300 rpm depending on the situation.?? Lucas 25D6
> dizzy built by Advanced Distributors.
> NGK BP8ES plugs, .028" gap.
> Points are the ones with the red plastic that come in the green "lucas"
> box, gapped to .015"
>
> The problem:?? I keep melting the plastic block on the points causing the
> point gap to close up to zero.?? At the suggestion of Jeff at Advanced
> Distributors, I replaced the 1.5 ohm coil with a 3.0 ohm coil (no ballast
> resistor).?? With the 3.0 ohm coil, the points??seem to last, but the car
> won't rev past 5000 rpm.
>
> With the hotter 1.5 ohm coil, the car runs really strong, and as long as I
> don't let the engine idle for very long, the points will last a couple
> sessions.?? I've been thru three sets of points, tried two different
> condensers all with similar results.
>
> The tow crew at Watkins Glen is very efficient, I pulled off behind the
> armco on the pace lap and was still able to watch all but the first two
> laps of the all Triumph feature from the stands!
>
> Jason Sukey
>
>
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