Crankfire Ignition/Nutek - - Page 2

stownsen914 · 05-04-2018, 08:08 PM

I am running twin plug, so 6 coils. It was set up years ago by someone else, but I think it was done per the manual. I'll try to snap a couple pics for you tomorrow. I can tell you that the ECI unit is mounted in the cockpit passenger side, and coils are in the engine bay.

Scott

Bb5280 · 05-05-2018, 01:07 PM

Scott and/or Fred - based on page 1 of the supplement, would i be right in assuming if i have coil 123 go to left aide (driver side) and coil 345 go to the right side; hook 1 to cyl 1/4 2 to cyl 6/3 3 to cyl 2/5 and then the same on the right side; will the system fire in the right order (it was programmed for a porsche 911 so i am assuming it will fire in the right sequence)

fred cook · fred cook's Garage

Quote:

Originally Posted by Bb5280

Scott and/or Fred - based on page 1 of the supplement, would i be right in assuming if i have coil 123 go to left aide (driver side) and coil 345 go to the right side; hook 1 to cyl 1/4 2 to cyl 6/3 3 to cyl 2/5 and then the same on the right side; will the system fire in the right order (it was programmed for a porsche 911 so i am assuming it will fire in the right sequence)

According to what I read in the manual, 1 to 1/4, 2 to 3/6, 3 to 2/5, 4 to 1/4, 5 to 3/6 and 6 to 2/5 should work. The firing order is 1-6-2-4-3-5 which would match up with the 1-6 numbers on the box.

Bb5280 · 05-05-2018, 08:11 PM

Ok - traced all lines from box to coils. Does this make any sense?

Coils 1-2-3 left side over cyl 1-2-3
Coils 4-5-6 right side over cyl 4-5-6

From box 1 port line goes to coil 1
From box 2 port line goes to coil 4
From bix 3 port line goes to coil 6
From box 4 port line goes to coil 3
From box 5 port line goes to coil 2
From box 6 port line goes to coil 5

That to me almost seems random and wrong! Am i missing something. If this was right the control box would have to fire port 1-3-5-2-4-6 to Have the correct firing sequence of 1-6-2-4-3-5. I would think the box would not be programmed that way.

stownsen914 · 05-06-2018, 07:59 AM

On the fourth page down in the manual I posted, it lists the connections as 1 and 2 on the box for cyls 1 and 4, 3 and 4 on the box for cyls 3 and 6, and 5 and 6 for cyls 2 and 5. Yours seems different for some reason.

It's difficult for me to get to my coils in the engine bay because the car is stored under a lift and I can barely open the rear deck lid / whaletail, or I'd look more closely. A couple pics below (sorry for them being sideways).

I'm not sure if the previous owner set it up differently for some reason, but if it were me, I'd try doing it the way the manual says. It will be obvious quickly if it's not right (the engine won't run right), and it shouldn't hurt anything to try. As a backup, you can do it however the PO had it. Of course you can also test the setup without running the engine if you prefer by turning the engine over manually and seeing when the sparkplugs fire.

Scott

Bb5280 · 05-06-2018, 09:04 AM

Ok - thanks scott - i missed that - and it is wired right based on that. Last question PROMISE! Prev owner had each coil plugged to one cylinder - so on the waste spark system, what would be right is top of coil fires plug top in cylinder one and the waste spark goes to bottom of 4. He had wired top and bottom of coil 1 to top and bottom of cylinder one. What would be the reason this would not work? If the coils is firing two anyway, why would it matter if both coil one went to cylinder one?

stownsen914 · 05-06-2018, 09:33 AM

No problem - happy to help!

Re: your question, I'm not sure, but no doubt there is a good reason why they choose to mix the cylinders like that. I'd guess it has something to do with optimizing charging time and maximizing energy in the coils for discharge. I'm not sure that explains why it would be preferable to have the cylinders mixed on the coils like that. Maybe call Electromotive? I believe they do that same thing, so could probably explain.

Scott

Bb5280 · 05-06-2018, 09:52 AM

How di i buy you a beer - thanks so much for all the help - you race at all in the midwest?

fred cook · fred cook's Garage

Quote:

Originally Posted by Bb5280

Ok - thanks scott - i missed that - and it is wired right based on that. Last question PROMISE! Prev owner had each coil plugged to one cylinder - so on the waste spark system, what would be right is top of coil fires plug top in cylinder one and the waste spark goes to bottom of 4. He had wired top and bottom of coil 1 to top and bottom of cylinder one. What would be the reason this would not work? If the coils is firing two anyway, why would it matter if both coil one went to cylinder one?

To answer your question, it would not matter. However, if one coil fire both plugs in (for example) cylinder #1 and that coil went bad then the cylinder would be completely dead. By using the wasted spark method, losing a coil would not completely kill a cylinder. If, however, the engine had very high compression, having only one plug firing in the cylinder might cause pre-ignition or detonation. So, every method has trade offs. My guess is that using a single coil per cylinder allowed for the use of very short plug wires that would not have to criss cross the engine. If you want to go to the wasted spark method, you should mount all the coils on the shelf like my car and stownsen914's car. That will allow the plug wires to be routed around the engine instead of over it. Just my .02 C. worth!

stownsen914 · 05-06-2018, 06:45 PM

Quote:

Originally Posted by Bb5280

How di i buy you a beer - thanks so much for all the help - you race at all in the midwest?

You doing vintage racing or club racing with your car? I got as far west as Mid Ohio a bunch of years ago. Would love to get out there again. Then we can have a couple cold ones!

Bb5280 · 05-07-2018, 06:25 PM

Absolutely - vintage vscda - bought the car, ran grattan - engine was never right and it blew - so i rebuilt itand getting started again. How about you - you race the 914?