Ther was an interesting article in Moss Motoring last month
something that I wasn't aware of. You may have to do some re wireing if
you are using a sport coil otherwise you will only get 20000 volts out of
it just like an ordinary coil. Check it out...
...Art
On Tue, 8 Jul 1997, ROBERT G. HOWARD wrote:
> Hi Rick,
> Addressing the Sports Coil idea, at the GOF Newton sports coils were
> mentioned. In the discussion, it was stated that a rule-of-thumb for
> spark plug gap is .001" per M volts. Since the standard Lucas coil
> delivers about 22-25M volts, depending on incoming voltage, the spark
> plugs should be gapped at .025. The Lucas sports coil delivers about
> 40M volts, so the plugs should be gapped at .040 to utilise the extra
> power. This was new to me, but it was then explained that Champion and
> NGK make plugs called "large gap" or something similar, that are
> especially configured for the extra gap and extra voltage. One might
> wish to check clearance between plug and piston if compression has been
> increased.
> Bob
>
> On Mon, 07 Jul 1997 20:50:47 EDT gofastmg@juno.com (Rick Morrison)
> writes:
> >
> >On Mon, 7 Jul 1997 18:40:03 -0400 Adrian Jones
> ><AdrianJones@compuserve.com> writes:
> >>Hi Folks,
> >>Here's an interesting little topic. ( Well I think so anyway)
> >>Is it possible to "fine tune" your carb mixtures by looking at the
> >>condition of your plugs? If so, here's some questions:
> >>A recent post said that the outer plugs (#1 and 4) tend to run rich,
> >>at
> >>least on an MGB. Does this apply to a Midget and if so , why?
> >
> > Yes. Both have the two exhaust valves adjacent to each other,
> >effectivly doubling the heat that must be transfered, added to
> >slighlty reduced water flow around the two centre cylinders adds up to
> >a pair that run slighlty hotter, consequently slightly leaner
> >
> >>If the engine was burning oil or if there was a slight ignition miss
> >>on o=
> >>ne
> >>or more cylinders, wouldn't this confuse the issue. =
> >
> >Yes. these problems, when noticed should be addressed before plug
> >condition can be used as a tuning tool
> >
> >>Is it OK to use a brass wire brush to clean the plugs.
> >
> >NO. any wire brush will leave minute tracks across the insulator
> >which can lead to lessend plug effeciency and longevity.
> >
> >
> >JC Whitney has something that uses grit and is powered by the car
> >>battery=
> >>=2E =
> >>
> >>Cost $8. Anybody used it?
> >
> >Got one ( not from J.C. Whitless) and it does a reasonable job on
> >normal plugs. Not so good on heavily fouled or sooted ones. Just
> >remember to get all the grit out before reinstalling the plugs
> >
> >>Are we looking for a light brown color? The cleanest plug so far,#4,
> >
> >>has=
> >> a
> >>definite reddish deposit.
> >
> >This can sometime be caused by additive and/or dyes in the gasoline
> >you are using. You might switch brands for a while with a new set of
> >plugs, and see if the condition changes.
> >
> >>Don't we want a slightly rich mixture for more power? Wouldn't this
> >>eventually foul the plugs with carbon? =
> >
> >If the plugs are getting carbon fouled, it's too rich. The carbon is
> >the result of less than optimum combustion.
> >
> >>Should the spark plug gap be kept at 25 thou. I have a Sports Coil
> >>but
> >>regular CB points.
> >>In the mornings, I need to do the "in and out and in and out" thing
> >on
> >>the
> >>choke as I go through the gears to keep it running smooth until it is
> >>warmed up nicely. Is this normal
> >
> >Yep, perfectly normal.
> >
> >>Like the man says, "Old farts want to know!"
> >>
> >>Adrian. (Being an old fart sure beats the alternative!)
> >
> >>From one old fart to another.
> >Rick Morrison
> >72 MGBGT
> >74 Midget
> >
> >>
>
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