I have a working 3.0L 1982 Porsche air-cooled 6 cylinder running on ECUMaster Black with DBW, sequential injection, and sequential firing Smart Coils (single Audi COP), just one per cylinder.
I am going to build a potentially hotter motor with slightly larger displacement, hotter cams and higher compression ratio. These engines benefit from a dual spark plug conversion - and it’s not a big jump in costs since the heads would have to go to air-cooled machine shop anyway for some porting, etc.
Can I safely run dual output on each of my 6 sequential coil outputs for the 12 Smart Coils? Thanks, Patrick
shouldn’t be any issues but double check signal just in case if internal pulldowns in coils are “to strong” for a signal in this case they will be connected in parallel so value will be halved and you need to check if reach 5v for spark request . but is I said above I wouldn’t expect issues.
I built a 3.2 (short stroke) with twin plug ignition. I’m also using Audi 4-wire smart COPs. Upper/lower plug pairs are triggered with the same EMU Black output. Upper COPs and lower COPs are on separately fused power circuits, but that’s just so I can disable each separately if needed for testing.
I’m in the process of installing the engine in the chassis, but I did run it on a test stand with no apparent ignition issues. Started and ran on first attempt.
Thank you very much! I felt about 90% sure that I’d be A-OK doing what you did. I, also, will employ a separate fused circuit for power to coils. I do have a question due to that good looking photo… I’ve been asked why my Audi coils protrude so far out of the upper valve cover. Can you share your spark plug part no and Audi coil part no? Your coil height looks more desirable than my “tall” ones! Thanks guys! Patrick
I think it’s used for a variety of 4 cylinder Audis.
Re: dual plug
I had the lower plug holes drilled and tapped for 12mm plugs (your uppers are 14mm), partly for space and partly to have less effect on compression ratio. I also used JIS height NGK plugs, which are a bit shorter. Remember to get the valve covers drilled and open up the plug hole in the chain case.
Great information on plugs and coils. Just now working on gathering all my fact finding so I HOPEFULLY do this upgrade correctly. I’m learning that there are a lot of moving pieces to get this right when you ditch CIS pc’s, etc. Thanks again. Patrick
