North American Turbocoupe Organization



Spark gap? Quick help, please.
WyldeSoul Offline
Member
#1
Just picked up some motorcraft plugs from the local dealer, and they said that they were gapped properly.

The thing is, it looks like there's less than a 1mm gap on them. I know the turbo cars need a small gap, but shouldn't it be a bit bigger than that? I can't even fit my gap checker in there to see what the gap is.
The Wench 1987 Turbocoupe. 5 speed. Black with Raven/Charcoal interior. Beater.
Mods: Cone filter, manual 2 stage boost controller (Gillis style), Thrush Glasspack (Pre-axle dump.)
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Joe F Offline
Posting Freak
#2
IIRC the recommended gap is 0.032"; if you're running a lot of boost you may want to reduce it to prevent spark blow-out.
JR's Place - My '87 Turbocoupe
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WyldeSoul Offline
Member
#3
Righto, thanks.
The Wench 1987 Turbocoupe. 5 speed. Black with Raven/Charcoal interior. Beater.
Mods: Cone filter, manual 2 stage boost controller (Gillis style), Thrush Glasspack (Pre-axle dump.)
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Dan S Offline
Administrator
#4
Local dealer must be smoking something illegal or just pulled the answer from a convenient location :eek: ! I'm not at home, so I can't look up the spec, but I would not go beyond .035 on the high side or .025 on the low side depending on psi settings for your turbo or your type of ignition coil.

Too much gap with higher psi could blow out the fire! Big Grin

(Sorry for the delay, I got tied up in a meeting and the reply sat on my computer. I see Brother Joe Cool gave you some good info).
Dan S
Custom 88 TC, Mandarin Copper Pearl Metallic
http://natomessageboard.com/ubbthreads.p...5#comments
1972 Ford F-100 SWB Styleside
2015 Lincoln MKC 2.3 EcoBoost AWD
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Pete D Offline
Administrator
#5
I have never see an Autolite 764 copper come out of the box at less than 0.045"
Pete Dunham


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Robert Camp Offline
Posting Freak
#6
And boost cannot "blow" out the spark! The increase in pressure results in a higher impedance across the gap. The voltage is not enough to ionize the mixture. If the secondary voltage could be increased it would spark.
Robert Camp
'86 Medium Regatta Blue TC, 5-speed, original owner.
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Dan S Offline
Administrator
#7
Quote:Originally posted by Robert Camp:
And boost cannot "blow" out the spark! The increase in pressure results in a higher impedance across the gap. The voltage is not enough to ionize the mixture. If the secondary voltage could be increased it would spark.
Merely a figure of speech!
Dan S
Custom 88 TC, Mandarin Copper Pearl Metallic
http://natomessageboard.com/ubbthreads.p...5#comments
1972 Ford F-100 SWB Styleside
2015 Lincoln MKC 2.3 EcoBoost AWD
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