coil problem..and coils off of other bikes??

[match417]

Two things...1)My coils are out, I picked up a bike yesterday to part out, pulled the coils off of it, tested them, the resistance values on the primary and secondary side were just barely above the working range. So I tried them out anyway..and what do you know..they are bad too. Super weak spark. My old coils had a more decent spark but they are both bad, and the spark wasn't hot enough the ignite anything. So basically I need a set of coils, and I don't want old ones, if I do get old FZR ones I'll need the resistance values on the primary and secondary. I tried running a 10 gauge wire straight to the battery for a great coil ground, still didn't work. So I'm gonna hop over to the wanted section and post an ad.

2) has anyone had luck with coils from other bikes working on theirs? Coils from another TDI setup? Something newer. Does anyone know if the YZF600 coils are TDI or CDI? If they are TDI i'm buying some.

[sweekster]

YZF600 coils will work.

[jong22250]

or you can do the coil conversion ,http://www.fzrarchives.com/ipb/index.ph ... opic=14281

[match417]

I've thought about this conversion before, but car coils aren't made to handle up to 11,500 RPM's. We tested the limitations of coils when I was in tuning school. They will cut out and stop working for a second or two whenever they get above the range they are made to handle. Maybe the escort coils were made to handle well above the rpm the car would get to, but usually going above 7k or 8k RPMs is hard to do on stock car coils. This is why I have R6 coil over plugs to put on my Toyota when I drop the engine in.

[fzrbrandon]

Just throwing it out there, but I've got a set of Accels that I'm selling. Two caveats: 1 - They're probably a bit more than you're looking to spend. 2 - If you're running the airbox, you'll need to get creative with placement because they're a bit bigger than the stockers. Caveat #2 was a problem for me because I wanted to run the airbox - hence me selling them...

Brandon

[jong22250]

been running the coil conversion for 2 years now i mounted mine in the space between the motor and the fuel tank to the left of the shut off for the tank 12,000 miles no problems and i hammer the shit out this bike every chance get, i.e every time it starts up,oh ya coils are junk yard ones so there stock and i am running accel wires.

[match417]

been running the coil conversion for 2 years now i mounted mine in the space between the motor and the fuel tank to the left of the shut off for the tank 12,000 miles no problems and i hammer the shit out this bike every chance get, i.e every time it starts up,oh ya coils are junk yard ones so there stock and i am running accel wires.

just out of curiosity what RPM range did you have the coils up to with no issues? And what year did you pull the coils off of? I've seen some strong coils, but there are also some pretty weak ones too.

[reelrazor]

I've thought about this conversion before, but car coils aren't made to handle up to 11,500 RPM's. We tested the limitations of coils when I was in tuning school. They will cut out and stop working for a second or two whenever they get above the range they are made to handle. Maybe the escort coils were made to handle well above the rpm the car would get to, but usually going above 7k or 8k RPMs is hard to do on stock car coils.

just out of curiosity what RPM range did you have the coils up to with no issues? And what year did you pull the coils off of? I've seen some strong coils, but there are also some pretty weak ones too.

It's all about dwell time(coil saturation), and spark duration...most of the problem with any car coil and high rpm issues is that the car coil is subject to (often) mechanical spark timing mechanisms(distributors).....coils driven by the FZR's ignitor box won't have these issues because the TCI box controls the dwell time (and circuit 'open' time/spark duration). Those cars that do drive their coils with electronic ignitors are subject to the limitations of the ignitor they're supplied with. This is why an aftermarket 'box' will often provide a marked improvement to any car engine that is still inductive ignition.

and the problem with "strong coils" is that they generally have more impedence...this lengthens the time necessary to fully saturate the coils (and also to collapse the field).

I myself used twin lead (waste spark) automotive coil packs (BMW) on two cylinder two strokes revving to 12,500 RPM and they worked as well as the accel units (I was getting the BMW coil packs for free-they aren't cherap by any means). And, both were superior to the OEM coil pack...in themselves allowing 1000 more RPM (the stockers gave up at 11,500)-and 12,5 was my calculated max piston velocity ceiling anyway.

The escort coils are modern tech 'E' wound coils-low resistance, fast saturation times- lots of people have switched to them, and the Subaru units with good results.

If you are sweating it, I would buy Brandon's Accels. Good price, great guy. I'm either switching to them, or some inductive C-O-P units. If the accels, I would mount one on each side, off the downtube bolts.

[jong22250]

i have hit 11,000 rpm many many many times

[yamaha_george]

I've thought about this conversion before, but car coils aren't made to handle up to 11,500 RPM's. We tested the limitations of coils when I was in tuning school. They will cut out and stop working for a second or two whenever they get above the range they are made to handle. Maybe the escort coils were made to handle well above the rpm the car would get to, but usually going above 7k or 8k RPMs is hard to do on stock car coils.

just out of curiosity what RPM range did you have the coils up to with no issues? And what year did you pull the coils off of? I've seen some strong coils, but there are also some pretty weak ones too.

It's all about dwell time(coil saturation), and spark duration...most of the problem with any car coil and high rpm issues is that the car coil is subject to (often) mechanical spark timing mechanisms(distributors).....coils driven by the FZR's ignitor box won't have these issues because the TCI box controls the dwell time (and circuit 'open' time/spark duration). Those cars that do drive their coils with electronic ignitors are subject to the limitations of the ignitor they're supplied with. This is why an aftermarket 'box' will often provide a marked improvement to any car engine that is still inductive ignition.

and the problem with "strong coils" is that they generally have more impedence...this lengthens the time necessary to fully saturate the coils (and also to collapse the field).

I myself used twin lead (waste spark) automotive coil packs (BMW) on two cylinder two strokes revving to 12,500 RPM and they worked as well as the accel units (I was getting the BMW coil packs for free-they aren't cherap by any means). And, both were superior to the OEM coil pack...in themselves allowing 1000 more RPM (the stockers gave up at 11,500)-and 12,5 was my calculated max piston velocity ceiling anyway.

The escort coils are modern tech 'E' wound coils-low resistance, fast saturation times- lots of people have switched to them, and the Subaru units with good results.

If you are sweating it, I would buy Brandon's Accels. Good price, great guy. I'm either switching to them, or some inductive C-O-P units. If the accels, I would mount one on each side, off the downtube bolts.

RR,
if you go with C-O-P units will you please do a HOW-TO for the WIKI Please.

[reelrazor]

RR,
if you go with C-O-P units will you please do a HOW-TO for the WIKI Please.

I will. As of yet, I haven't found any decently priced inductive ignition c-o-p coils. They are out there, people make them, but they also want a pretty penny for them. I SUSPECT some of the early high end Ford/Lincoln/Mercury C-O-Ps are inductive. But haven't gotten confirmation of that-soon as I get one in my hand, you can bet I will meter them, 'cause they will be an easy junkyard find