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Distributor, Cap and Wires 180° out - Runs okay...
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Topic: Distributor, Cap and Wires 180° out - Runs okay... (Read 1106 times)
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Gaugster
Sr. Member
Posts: 396
Distributor, Cap and Wires 180° out - Runs okay...
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on:
August 13, 2020, 04:25:42 PM »
I was going to throw some stones and hijack My427stang's post but figured I'd just swipe one of the pics from it instead. Based on the scenario below should I reorientate my mechanical advance distributor? When I bought my Cougar it ran but was in a state of disrepair. Vacuum leaks galore, corroded cap & rotor etc...When I bought the car my distributor was wired completely 180° different than what I find on-line for firing order. Seeing the recent dyno motor pics reminded me to inquire with the experts. Here's my old 390 with a new QF 680 carb that I recently installed. My plug wires are routed basically 180° from what is normal. The engine has always had a slight sputter at cruising speeds of 45-50mph. A very notable drop off in torque after 4500 rpm. This was true with both the old and new carb. I have always attributed these to an old tired engine. The carb was changed as I suspected the throttle body and butterflies of the old carb to be worn. It was a 1st generation Demon 650 and no proper throttle stop had been installed.
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Last Edit: August 13, 2020, 04:27:48 PM by Gaugster
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John - '68 Cougar XR7 390 FE (X-Code) 6R80 AUTO
blykins
Hero Member
Posts: 4828
Re: Distributor, Cap and Wires 180° out - Runs okay...
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Reply #1 on:
August 13, 2020, 04:46:40 PM »
As long as the firing order is correct and the rotor is pointing at the #1 plug wire at TDC of the compression stroke, it will run. Doesn't matter at all if the #1 plug wire is on the cap facing the rear of the cap or at the front.
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Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
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fryedaddy
Hero Member
Posts: 1253
Re: Distributor, Cap and Wires 180° out - Runs okay...
«
Reply #2 on:
August 13, 2020, 05:00:27 PM »
when i got my 428 out of the machine shop it was 180 off.i didnt know so i wired it up correctly,pointing at no 1.it would not start,so i lifted the dist out and spun it 1/2 turn and dropped it in and it fired right up
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1966 comet caliente 428 4 speed owned since 1983 1973 f250 ranger xlt 360 4 speed papaw bought new
turbohunter
Hero Member
Posts: 2509
Re: Distributor, Cap and Wires 180° out - Runs okay...
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Reply #3 on:
August 13, 2020, 05:01:46 PM »
I kinda enjoy seeing where folks put no.1 then checking how clear there runs are. Ross has a nice clean set of runs there.
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Marc
'61 F100 292Y
'66 Mustang Injected 428
'66 Q code Country Squire wagon
Gaugster
Sr. Member
Posts: 396
Re: Distributor, Cap and Wires 180° out - Runs okay...
«
Reply #4 on:
August 13, 2020, 06:40:48 PM »
Thanks all for the input. I too like to check out they lay of plug wires but it's apples to oranges for my motor currently. In my case it's easy to keep #7 and #8 apart.
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John - '68 Cougar XR7 390 FE (X-Code) 6R80 AUTO
Nightmist66
Hero Member
Posts: 1209
Re: Distributor, Cap and Wires 180° out - Runs okay...
«
Reply #5 on:
August 13, 2020, 06:47:32 PM »
As Brent said, the engine doesn't care where #1 is, as long as you time the rotor on TDC compression and the rest of the firing order is correct. Here's my junk:
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Jared
66 Fairlane GT 390 - .035" Over 390, Wide Ratio Top Loader, 9" w/spool, 4.86
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Distributor, Cap and Wires 180° out - Runs okay...