Preferred COP and Coil Units?

Spenser309 · Post by **Spenser309** » Tue Nov 29, 2005 6:11 pm

im guessing that the LS2 coils wouldnt need an ignition driver then?

no vb921's

PFM · Post by **PFM** » Thu Dec 08, 2005 5:33 pm

OK I have been looking but must be a bit slow, I am looking at 4 GSXR COP units, DENSO 129700-4400, sweet if they are what I think. There are only two pins on the unit plus the HV end for the spark plug. If it had three pins I think it would make sense but how do you wire this thing to a MSnS unit? I thought it would have 12v, ground and trigger.

This whole COP thing is just too cool. I need to fire 12 spark plugs, for a twin plug flat six and I dont think all the loose ends have been closed for this deal but I am patient.

Any ideas Im all ears, well eyes.

Thanks in advance

PFM

16V-Sauger · Post by **16V-Sauger** » Sun Apr 16, 2006 3:18 am

http://www.directupload.net/show/d/653/OIT4tx4H.jpg

from a audi s3

Jon k · Post by **Jon k** » Sun Apr 16, 2006 5:40 am

gielamonster wrote:
Does anyone know of any COP units for non-DOHC motors? I'd like to find some that are only 2-3" long instead of 5". Assuming there aren't any to be found, any ideas on how to make the fit of these a little more permanent? I was thinking an extra sleeve of insulating material around the whole thing, that made for a snugger fit with the head.

On my BMW coils, you can pull the rubber extending boot off and the coil is about 2" in length, myabe if you cut the boot down? I think theres a resistor in there though, not entirely sure.

arny528 · Post by **arny528** » Sun Apr 16, 2006 12:58 pm

Jon k wrote: On my BMW coils, you can pull the rubber extending boot off and the coil is about 2" in length, myabe if you cut the boot down? I think theres a resistor in there though, not entirely sure.

They do have a resistance, and it is different for different models. I believe I've seen 1.8k resistance for Bosch and 1k for Bremi coils (or vice versa) for the same M50B25 engine. I'm not sure how much is that resistance important, but I had an idea to put normal plug wires on them, so they could be mounted at a more convenient location on another engine.

Scummer · Post by **Scummer** » Mon Apr 17, 2006 10:13 am

I'm running the coilpacks from a Mitsubishi 3000GT on Mazda KL03 engine for wasted spark setup. My dwell time is set to 4.5ms
So far the car runs great.

Thomas

Jon k · Post by **Jon k** » Wed Apr 26, 2006 8:19 am

Scummer wrote:I'm running the coilpacks from a Mitsubishi 3000GT on Mazda KL03 engine for wasted spark setup. My dwell time is set to 4.5ms
So far the car runs great.

Thomas

For people running 4 coils or more, can you post pics of your MS board to see how 2+ VB921s are mounted?

PSIG · Post by **PSIG** » Wed Apr 26, 2006 9:41 am

PFM wrote:...There are only two pins on the unit plus the HV end for the spark plug. If it had three pins I think it would make sense but how do you wire this thing to a MSnS unit? I thought it would have 12v, ground and trigger. ...

Just 2 terminals is perfect, as the standard MS coil wiring is +12v to one terminal and the other terminal goes to the VB921 controlling it. Done.

gielamonster · Post by **gielamonster** » Thu Apr 27, 2006 11:55 am

Bruce Bowling wrote:
efahl wrote:I'm rather utilitarian, I think this is rather cool myself (Corvette LS-2 CNP):

http://hotrod.com/techarticles/engine/1 ... 2_18_z.jpg

Solves a lot of packaging problems, delivers good energy and widely available. Don't know about cost and driver requirements, but I'd guess that there are junkyard sources for LS-1 coils+wires just about anywhere here in the US.

Eric
I believe these are the GM part number 12558948, the connector is GM 12102741, HT wire is either GM 15301401 or 12569111

Look this up on www.gmpartsdirect.com

I have played with these on the bench and they work off of a +5V pulse, set for dwell time. Looking into the connector on the coil, from left to right, the pins are denoted A,B,C,D, with a keyway between A and B on the connector rim. The pinout is A=GND, B=Ref Low (i.e. return gnd to ECU), C=Ign trigger, D=+12V

Bruce, I got my LS1 coils yesterday. Do I just wire them up with the the trigger wire I had controlling my VB921s going directly to pin C?

Also, any guesses at a starting dwell setting for these coils? And are they auto-dwell capable? So as long I have a large enough dwell specified, they'll shut off before that, when they're properly charged, correct?

Jon k · Post by **Jon k** » Thu Apr 27, 2006 12:19 pm

gielamonster wrote:
Bruce Bowling wrote:
efahl wrote:I'm rather utilitarian, I think this is rather cool myself (Corvette LS-2 CNP):

http://hotrod.com/techarticles/engine/1 ... 2_18_z.jpg

Solves a lot of packaging problems, delivers good energy and widely available. Don't know about cost and driver requirements, but I'd guess that there are junkyard sources for LS-1 coils+wires just about anywhere here in the US.

Eric
I believe these are the GM part number 12558948, the connector is GM 12102741, HT wire is either GM 15301401 or 12569111

Look this up on www.gmpartsdirect.com

I have played with these on the bench and they work off of a +5V pulse, set for dwell time. Looking into the connector on the coil, from left to right, the pins are denoted A,B,C,D, with a keyway between A and B on the connector rim. The pinout is A=GND, B=Ref Low (i.e. return gnd to ECU), C=Ign trigger, D=+12V
Bruce, I got my LS1 coils yesterday. Do I just wire them up with the the trigger wire I had controlling my VB921s going directly to pin C?

Also, any guesses at a starting dwell setting for these coils? And are they auto-dwell capable? So as long I have a large enough dwell specified, they'll shut off before that, when they're properly charged, correct?

Also - any idea on BMW coil pack dwell times?

gielamonster · Post by **gielamonster** » Thu Apr 27, 2006 12:58 pm

I googled "LS1 dwell" and found a lot of AEM guys use them. Only one post actually mentioned a value for dwell, and it said 5ms burns them out. So sounds like they're not auto-dwell? not a biggie, I have a lab-grade .01 ohm resistor to scope with.

Jon k · Post by **Jon k** » Thu Apr 27, 2006 1:37 pm

gielamonster wrote:I googled "LS1 dwell" and found a lot of AEM guys use them. Only one post actually mentioned a value for dwell, and it said 5ms burns them out. So sounds like they're not auto-dwell? not a biggie, I have a lab-grade .01 ohm resistor to scope with.

Any info on BMW coils? If I sent someone a coil could they scope it?

Jon k · Post by **Jon k** » Mon Mar 05, 2007 4:31 pm

Jon k wrote:
gielamonster wrote:I googled "LS1 dwell" and found a lot of AEM guys use them. Only one post actually mentioned a value for dwell, and it said 5ms burns them out. So sounds like they're not auto-dwell? not a biggie, I have a lab-grade .01 ohm resistor to scope with.
Any info on BMW coils? If I sent someone a coil could they scope it?

FWIW I am running BMW COP coils from a 1992 BMW M50 (bosch, but also bremi coils available for same engine/ecu) at 3.0 ms run and 4.0ms crank

tristanlee85 · Post by **tristanlee85** » Tue Mar 06, 2007 11:55 pm

I was wondering, does anyone have a list of different applications the COPs are found on (year, make, model, etc)? I'd like to hit up the junkyard and look for some that fit well, but I haven't seen a list anywhere.

mac1 · Post by **mac1** » Thu Feb 17, 2022 10:36 am

Here are my measurements for a
Honda CBR 1000rr coils
129700-4840
Total length with boot 5.6"
without boot 4.72"
boot is 1.6" long and is covers up .65" of the coil end
Total usable length (129700-4840) 4.8" from top of seal to the end of the boot

So I now assume the 2 digits in the part number is the Usable length sticking down the bore.
YOu take that number and subtract the length of boot that slips over the plug and in this case would be (1.6 - .65) .95" reach to the plug when slipped over the threads.
YOu need plugs with removable Terminal !!

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Preferred COP and Coil Units?

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