[ROVERNET - UK] P6 -SD1 spark plug gap?

Thu Jan 18 06:07:29 GMT 2007

You don't really Need to upgrade the coil if the system works fine!
I would recommend if for a V8 though.

PVS

----- Original Message ----- 
From: "Slatskars" <slatskars at comcast.net>
To: <rovernet at lyris.ccdata.com>
Sent: Thursday, January 18, 2007 4:09 PM
Subject: Re: [ROVERNET - UK] P6 -SD1 spark plug gap?

> I still have an old CDI floating around somewhere in the shop. I built it
> years ago from an Allied Kit. I believe that it was the same
electronically
> as a Delta. It worked quite well on several cars to the point of having to
> replace the points because the fiber rub bar wore out, but the points were
> still very good.
>
> I now use Pertronix, but have not upgraded my coils. I will have to look
> into that!
>
> Slats
> ----- Original Message ----- 
> From: "Paul Smith" <Paul.Smith at auroraenergy.com.au>
> To: <rovernet at lyris.ccdata.com>
> Sent: Wednesday, January 17, 2007 1:33 PM
> Subject: RE: [ROVERNET - UK] P6 -SD1 spark plug gap?
>
>
> There are 2 main types of electronic ignition, TAI and Capacitor Discharge
> Ignition.
> Personally I like CDI but they are out of favour currently.
> I think Pertronix are a Hall Effect or inductive sensor triggering a TAI.
I
> have points triggering a TAI.
> On a normal (Kettering) ignition, the points take 3 to 4 amps (more on
Jags,
> don't kow why) which runs through the coil primary.  The coil is a step up
> transformer.  When the points open breaking the current (fairly quickly,
> there is arcing) the spike change induces a high voltage in the
secondary -
> the HT side which goes to the spark plugs.   If you get 15kv it will
produce
> an ok spark at the plug.
> However it gets trickier...
> As the revs rise, the time for the primary current to establish itself
> (recover) once the points close can mean it never reaches the 3A, so the
> secondary voltage falls.  This happens with V8s easily, since there is
half
> the time of a 4 for each cylinder fire.
> Soooo the solution is to extend the dwell time - the time that the points
> are closed establishing that current.  This can be achieved mechanically
by
> 2 sets of points, so that one close shortly after the other opens.  A TAI
> does it electronically, by switching a transistor to reestablish primary
> coil current.  The other solution is a better coil - they have higher
> permeability ferrite in them, I don't know more.
> This also removes arcing (and thus lots of wear) from the points since
they
> now handle 0.3A or so.
> The next step (a la Pertronix) is to replace the points with a non contact
> trigger, a magnet of some form.  This elimminates the need to adjust at
> regular intervals.
>
> PVS
>
> -----Original Message-----
> From: rovernet-bounces at lyris.ccdata.com
> [mailto:rovernet-bounces at lyris.ccdata.com]On Behalf Of geffandjulie
> Sent: Thursday, 18 January 2007 4:50 am
> To: rovernet at lyris.ccdata.com
> Subject: Re: [ROVERNET - UK] P6 -SD1 spark plug gap?
>
>
> What is a transistor-assisted ignition?  That's a new term. I think I
> understand electronic ignition, and the Pertronix system, but...
> ----- Original Message ----- 
> From: "Paul Smith" <Paul.Smith at auroraenergy.com.au>
> To: <rovernet at lyris.ccdata.com>
> Sent: Tuesday, January 16, 2007 1:28 PM
> Subject: RE: [ROVERNET - UK] P6 -SD1 spark plug gap?
>
>
> P6B used ballasted coil.
> Yes, any coil should do the job, I usually get one off a Jap car, they
last
> and work well.
> Right at the moment I have the Lucas on my P6B, it is working fine, and I
> added a Transistor Assisted Ignition to improve voltage.  Can take
pictures
> and show wiring.
>
> PVS
>
> -----Original Message-----
> From: rovernet-bounces at lyris.ccdata.com
> [mailto:rovernet-bounces at lyris.ccdata.com]On Behalf Of geffandjulie
> Sent: Wednesday, 17 January 2007 5:03 am
> To: rovernet at lyris.ccdata.com
> Subject: Re: [ROVERNET - UK] P6 -SD1 spark plug gap?
>
>
> Thanks. Can I try a higher voltage coil? And does it need to be ballasted?
I
> am showing my ignorance!
> ----- Original Message ----- 
> From: "Paul Smith" <Paul.Smith at auroraenergy.com.au>
> To: <rovernet at lyris.ccdata.com>
> Sent: Monday, January 15, 2007 7:39 PM
> Subject: RE: [ROVERNET - UK] P6 -SD1 spark plug gap?
>
>
> Yep.
> The max gap is determined by the coil voltage (not so great with Lucas
> standard), the min gap by what makes the mixture burn and the plug not
foul.
> Try .025.
>
> PVS
>
> -----Original Message-----
> From: rovernet-bounces at lyris.ccdata.com
> [mailto:rovernet-bounces at lyris.ccdata.com]On Behalf Of geffandjulie
> Sent: Tuesday, 16 January 2007 2:19 pm
> To: Rovernet05
> Subject: [ROVERNET - UK] P6 -SD1 spark plug gap?
>
>
> I have SD-1 heads on my P6. Based on advice, I have installed the correct
> SD-1 plugs, NGK BP6ES. However, I set the gap to .030" vs. the .025 book
> figure for the Champion N92YC.   It has a standard Lucas distributor and
> coil. It starts but runs rough.
> ***Is the gap too wide?***
> Thanks in advance.
> Geff and Julie McCarthy
> AvMedSafe
> 503-241-8468
>
>
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