[Healeys] Petronix Ignitor

[Bob Spidell]

Ah ... fewer cylinders==longer dwell==hotter module?  Offhand, I don't know the dwell angle for a 4-cyl--anyone 
know?--think it's about 35deg for a 6-cyl.

The Pertronix coil comes in 1.5 and 3.0 ohm versions; I think a stock Healey coil is about 1.5 ohms (not sure).   You're 
right, their website should make it clear which impedance coil should be used with which engines--with a Pertronix--if 
it's significant.   From the website: '... it's the perfect coil to go with the PerTronix Ignitor breakerless ignition 
...' and '... coil can benefit virtually any distributor type inductive system ...'  I see the Pertronix II has 
'adjustable dwell' and senses coil impedance;  too bad it doesn't come in a pos-ground version.

  I'm still not convinced there's a problem; unless the dwell for a 4-cyl is significantly longer than a 6-cyl.  If 
their 1.5ohm coil won't work well with a Pertronix without ballast they should make that clear.  My BJ8 doesn't have any 
ignition problems with heat, but I've only run it to 115degF in Death Valley (they're supposedly good to 300deg).


Bob



On 10/3/2011 9:25 PM, Alan Seigrist wrote:
> They say if you have a V8 or V12, there's no need for ballast.  6cyl
> racer doesn't need it, but 6cyl street car should.  4cyl definitely.
> Something about an fully charged coil over heating the module.  You're
> probably fine with the 6cyl but might have problems at idle on very
> hot days.
>
>
>
> On 10/4/11, Bob Spidell<bspidell at comcast.net>  wrote:
>> re: "... If you have a 4 cyl motor, you have to get a 3 ohm coil to go with
>> the Pertronix. "
>>
>> Soooooo ... the 4-cyl coils are different than the 6-cyl?
>>
>> I've run Pertronix with a stock (6-cyl) coil for years.
>>
>> Bob
>>
>>
>>


-- 
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Bob Spidell           San Jose, CA            bspidell at comcast.net

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