- Posts: 21
- Thank you received: 0
3 ohm coils
- djbragg
- Topic Author
- Offline
- User
Less
More
22 Jan 2019 07:39 #797280
by djbragg
3 ohm coils was created by djbragg
I have a 1976 KZ900 with dyna s and 3 ohm coils, coils go to 5 ohm when heated with hair dryer, is this normal?
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
Less
More
- Posts: 18640
- Thank you received: 2098
- loudhvx
- Offline
- KZr Legend
Less
More
- Posts: 10868
- Thank you received: 1616
22 Jan 2019 13:48 - 22 Jan 2019 13:53 #797317
by loudhvx
It is normal for them to go up by some amount, but 5 ohms seems a bit much. I would have expected closer to 4 ohms. There are a lot of variables, though. For one thing, how accurate is your meter?
Here is a link to some data on typical Kz coils and how they respond to heat.
s3.amazonaws.com/gpzweb/Ignition/Ignitio...s/IgnitionCoils.html
Assuming you have the large, green Dyna 3.0 ohm coil,
I found on a very similar, 3.0 ohm Accel Supercoil, with self-heating from use, would raise the resistance from 3.2 ohm cold to 3.8 ohm hot. That was in open air, not moving.
A hair dryer might heat it more if it's really close maybe. And in normal use, when mounted under the tank on a really hot day with stop and go traffic it may get hotter than my test. I was only demonstrating that the resistance goes up significantly, but not really tracking the temp versus resistance.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
Replied by loudhvx on topic 3 ohm coils
djbragg wrote: I have a 1976 KZ900 with dyna s and 3 ohm coils, coils go to 5 ohm when heated with hair dryer, is this normal?
It is normal for them to go up by some amount, but 5 ohms seems a bit much. I would have expected closer to 4 ohms. There are a lot of variables, though. For one thing, how accurate is your meter?
Here is a link to some data on typical Kz coils and how they respond to heat.
s3.amazonaws.com/gpzweb/Ignition/Ignitio...s/IgnitionCoils.html
Assuming you have the large, green Dyna 3.0 ohm coil,
I found on a very similar, 3.0 ohm Accel Supercoil, with self-heating from use, would raise the resistance from 3.2 ohm cold to 3.8 ohm hot. That was in open air, not moving.
A hair dryer might heat it more if it's really close maybe. And in normal use, when mounted under the tank on a really hot day with stop and go traffic it may get hotter than my test. I was only demonstrating that the resistance goes up significantly, but not really tracking the temp versus resistance.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
Last edit: 22 Jan 2019 13:53 by loudhvx.
Please Log in or Create an account to join the conversation.