autolite 3923 or 3924 - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 10 Old 04-06-2007, 09:48 AM Thread Starter
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autolite 3923 or 3924

stock shortblock
performer heads with 1.9 valve
crower 15511 cam w/1.6 rockers
performer rpm2 intake

hellion 62mm turbo kit on 11psi

stock ignition , good wires and cap

would you run a/r 3924's or a/r 3923's on a set up like this and why ?


1990 Notchback stock bottom end , TW's , F cam , Systemax and 66mm in the works.
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post #2 of 10 Old 04-06-2007, 09:53 AM
 
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With alum. heads and power adder run the autolite 3922's

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post #3 of 10 Old 04-06-2007, 10:18 AM Thread Starter
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With alum. heads and power adder run the autolite 3922's
got ya .... any reason behind that ? 3922 are 2 steps colder correct ?

1990 Notchback stock bottom end , TW's , F cam , Systemax and 66mm in the works.
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post #4 of 10 Old 04-06-2007, 12:30 PM
 
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got ya .... any reason behind that ? 3922 are 2 steps colder correct ?
Yeah, 1 range colder with the alum heads and an additional range colder for the boost......
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post #5 of 10 Old 04-06-2007, 02:11 PM
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I bought a used set ow TW Heads and called Trick Flow and asked what plug they recommended and they said 3924, so I went w/ a 3923, would that be a problem? Car is about 5 days from running.
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post #6 of 10 Old 04-06-2007, 02:31 PM
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I run 3923's on my TW Heads. Haven't had the car under a full load of boost, but it has seen many bottles of nitrous and the 3923's. Trick flow recommends the 3924's as a stock style plug for the TW cylinder heads, when adding boost/nitrous i would recommend going w/ the 3923's. Don't go any colder than what you have too. Same goes for plug gap, the wider the gap the better the potential to ignite the fuel mixture, only go as tight as needed.

93' SSP Notch 579hp/556tq - SOLD
00' GT 641hp/536tq - Novi 2K(17psi)
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post #7 of 10 Old 04-06-2007, 05:14 PM
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3923's

95 cobra 90 gt
hp turbo kit black-on-black
systemax heads and intake
stupid little bolt-on's
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post #8 of 10 Old 04-06-2007, 05:26 PM
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3923

80 coupe, N/A 347, tko500 1.34, 6.30 @ 109.01, 9.87 @ 137.06

16 GT, daily driver on pump 93, Procharger 1.42, 6.31 @ 109.59, 9.80 @ 141.57
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post #9 of 10 Old 04-06-2007, 07:31 PM
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I could be wrong but aren't 3922 3 heat ranges colder.
Anyway I ran 3923 gaped @ .027 one both my performer and my Track heat heads.

Big Bore Boss 347 FTI 225cc High Port, FTI Cam, Box R Intake under stock hood, T-56 Magnum, 4.30 gears.
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post #10 of 10 Old 04-06-2007, 08:31 PM
 
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yes correct 3925 s are stock, 24 s are 1 step colder 23 s are 2 steps colder

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