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Join Date: Feb 2018
Location: SW Washington State
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Change SC coil location from engine to electrical panel?

Since I'm in the middle of an engine wire harness repair and rewiring project, I've considered moving the ignition coil from the fan housing to the electrical panel on the left side of the engine bay, like the later model cars did. I'm running a WOSP high-amp alternator with internal regulator, so I have space on the electrical panel where the external regulator used to be.

Aside from cleaning up the appearance of the back of the engine, and moving some of the wires off the engine, it seems to me that moving the coil will put it in a non-vibrating and cooler spot, which should help it last longer.

Are there any downsides to doing this?

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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.

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Old 12-19-2023, 11:14 PM
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IMHO you should at least use a GND sealed wire from the coil to the rotor cap as voltage spikes are hughe and could affect i.E. the signal from the dizzy to the CDI unit
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911 SC 3.0, 1982, black, US model – with own digital CPU based lambda ECU build and digital MAP based ignition control

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Old 12-20-2023, 12:51 AM
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Andrew, you mean a shielded wire from the coil secondary to distributor? Don't you think this would lead to arcing inside the cable, since it carries over 40,000V spikes.
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Old 12-20-2023, 01:42 AM
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Fairly common on Twin Plug applications where space may be a premium.

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Steve
1981 SC Steel Widebody Outlaw in Pacific Blue and Artic White, 930/51 to 3.2l, K27 7006 Turbo, P&P Twin Plug heads, Twinfire Ignition, BLwur, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, DOD, DP Lid, 044 pump, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters.
Old 12-20-2023, 03:03 AM
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Arrow

No down sides moving the coil that I have noticed.
I have created a plug and play harness with connectors for ease of component configuration and maintenance.

I’ll probably change the terminal blocked connections to a fused connection block with a protective cover.


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Old 12-20-2023, 06:51 AM
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