I have a Nissan Pintara (in Australia) which is a 4 cylinder with dual plugs, leads and coils, but only one distributor.
As I understand it, the first plug fires just before top dead centre, as it should, and the second plug is positioned at the exhaust valve (it may even be in the exhaust manifold) and fires during the exhaust stroke to burn any excess fuel, to help reduce emissions. I don't think this is what we want in an aircraft, though we do care about emissions, we want redundancy. The car is not here, my farther has it 1800km away, so I can't check it, as if looking from the outside will tell me !!!! (I'm not going to pull it just to check :-). Regards Barry Kruyssen Cairns, Australia RAA 19-3873 k...@bigpond.com http://users.tpg.com.au/barryk/KR2.htm ----- Original Message ----- I have a Nissan pickup with the z24 engine. I know it is dual ignition (8 spark plugs) don't know if it has 2 separate timing sensors, but pretty sure it has a two level distributor cap and rotary button to provide separate high voltage circuits. I can look into it in a day or so. could even pull it out and meaure the shaft, gear etc., if that would help (just let me know) my guess is you would have to modify it to make it work for you. Will have to wait for the rain to stop, seems theres still an airplane in the garage. BTW the four cylinder ford ranger has 8 spark plugs, but I think they have a distributorless ignition system. Best Regards Riley Collins Rutledge, TN
