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Old 09-12-2011, 05:12 PM   #1
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Default whats the plug gap for a 93 4.9l

My truck has no stickers under the hood so nothing to be sure on but I was thinkin its .44 and if u set it a lil higher will it do any good
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Old 09-13-2011, 02:36 AM   #2
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I set mine to 54 and noticed a power gain, then get the rest of the stuff for a sixlitre tuneup. Big difference in horsepower and MPG if you can keep your foot out of it. Do a search for the sixlitre tuneup.
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Old 09-13-2011, 04:02 AM   #3
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stock specifications:
gap=.042"-.046"
torque=14-20Ft-Lb -@LLD@T@
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Old 09-13-2011, 06:00 AM   #4
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I always gap at .044
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Old 09-13-2011, 09:56 AM   #5
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I say if the gap is larger than stock specs, get a higher output coil because widening the gap is going to increase the coil's dwell time (saturation,) which in turn will make it output at a higher voltage and possibly reducing it's life from operating at a slightly warmer temp.

Then again, having a coil with too high of an output will only eat up sparkplugs like PEZ under low compression ratios (8.8-9BAR)

Higher CR=higher voltage needed to overcome compression
Lower CR=lower voltage needed to overcome compression
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Last edited by bluecar5556; 09-13-2011 at 10:28 AM.
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Old 09-13-2011, 10:22 AM   #6
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Normal secondary ignition coil oscilloscope pattern
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Old 09-14-2011, 01:44 AM   #7
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Default Coils

An aftermarket MSD Streetfire coil outputs 48,000 volts. The factory Ford coil outputs 50,000 volts. An aftermarket high output coil is not needed. I would rather use the factory Ford than the Chinese MSD. If it was a high RPM motor, I would agree with you, but stock motors don't hit the RPMs that would necessitate a high output coil. Just my 2 cents.
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Old 09-14-2011, 02:07 AM   #8
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Quote:
Originally Posted by bluecar5556 View Post
Higher CR=higher voltage needed to overcome compression
Lower CR=lower voltage needed to overcome compression
Exactly my point,
Higher CR=higher output
Lower CR=lower output

The dwell time, the coil must saturate longer to overcome a larger gap, therefore the coil WILL be higher output. The ford coil spec 50kv is @ .044" electrode gap, not @.054" that some people run.
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92' F150 XLT 351 2x4 E40D, had 3.08:1 stock, now with 3.55:1 Stock wheel and tire size

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Old 09-14-2011, 02:07 AM
 
 
 
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