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> Spark Plug GAp, with MSD
jim_hoyland
post Aug 16 2009, 02:10 PM
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I'm running a Bosch blue coil, Mallory unilite, and MSD 6. The MSD went in 2 weeks ago and I did not change the spark plug gap. Runs fine. Should the gap be increased ? or is it only increased if you run the Blaster coil.
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messix
post Aug 16 2009, 02:31 PM
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.040 -.045 is safe.
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J P Stein
post Aug 16 2009, 02:34 PM
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QUOTE(jim_hoyland @ Aug 16 2009, 01:10 PM) *

Should the gap be increased ? or is it only increased if you run the Blaster coil.


Leave it at the stock settings. With the Blaster you can go to .045-.050.
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MDG
post Aug 16 2009, 07:46 PM
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MSD 6AL, Blaster Coil; gapped at .050 - works great on mine. The -6 that is.
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yeahmag
post Aug 17 2009, 12:59 AM
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Mallory Unilite, Mallory 6AL, and a Blue Coil - Gaped at .040 (NGK B6ES-11 is pre-gaped at .040")
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jim_hoyland
post Aug 17 2009, 10:29 AM
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QUOTE(yeahmag @ Aug 16 2009, 11:59 PM) *

Mallory Unilite, Mallory 6AL, and a Blue Coil - Gaped at .040 (NGK B6ES-11 is pre-gaped at .040")


Is the NGK B6ES-11 a cooler plug ?
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yeahmag
post Aug 17 2009, 10:48 AM
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Stock NGK replacement plug for the 914. The "-11" signifies the .040" pre-gap. The advantage there is that the plug is built for the gap. Otherwise, bending the electrode out on a "standard" plug will result in a non-parallel plug gap.
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jim_hoyland
post Aug 17 2009, 02:55 PM
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QUOTE(yeahmag @ Aug 17 2009, 09:48 AM) *

Stock NGK replacement plug for the 914. The "-11" signifies the .040" pre-gap. The advantage there is that the plug is built for the gap. Otherwise, bending the electrode out on a "standard" plug will result in a non-parallel plug gap.


Thanks for the lesson; never knew that. How is a standard NGK gap plug designated ?
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J P Stein
post Aug 17 2009, 02:58 PM
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I mis-spoke, I'm afraid. The blue coil comes up short with a big gap on plugs whem used over 6K rpms firing 6 cylinders. It may work out fine for those not going there.
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jim_hoyland
post Aug 17 2009, 04:13 PM
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QUOTE(J P Stein @ Aug 17 2009, 01:58 PM) *

I mis-spoke, I'm afraid. The blue coil comes up short with a big gap on plugs whem used over 6K rpms firing 6 cylinders. It may work out fine for those not going there.


My '75 is a 1.8L 4 banger with the L-Jet; nothing special, but I did upgrade to the Mallory and MSD. Truly runs smoother through all RPMs.
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yeahmag
post Aug 17 2009, 04:20 PM
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The standard NGK is just a B6ES (no -11 designation)
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