I have a Lucas sport with conventional points, Champion N9YC's and
gapped at .038 and works just great.
>-----Original Message-----
>From: mgbob@juno.com [SMTP:mgbob@juno.com]
>Sent: Tuesday, July 08, 1997 4:24 AM
>To: gofastmg@juno.com
>Cc: AdrianJones@CompuServe.COM; mgs@autox.team.net
>Subject: Re: Reading Spark Plugs
>
>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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