QUOTE (dajogejr @ Jul 7 2008, 07:26 AM)
index.php?act=findpost&pid=4681B9ES @ .018 is all I run Mark....the only reason I don't run BR series is my Hotwires have a resistor built into them....
Although the methanol cools the motor better, the actual combustion is hotter than gas. That's the need for a colder plug.
I run BR plugs with my Dyna mostly because it doesn't seem to make a difference on the dyno or with plug life, and the Dyna manual states that you are supposed to run resistor plugs.
With your Hotwires, I think you mean they have capacitors in them, not resistors.
I was curious mostly about the heat ranges folks run with, due to the following:
1.) I was out of BR8ES plugs in my garage yesterday.
2.) While everything you stated about methanol combustion temperature is correct, the flame propogation is quite different than gasoline or nitromethane, and I could probably make a case for going to a hotter heat range plug as well as I could for going colder. My professional experience doen't necessarilly correlate to what to do with a two stroke and all of the books on the subject I have read seem to be all over the place with what has been run. You have to remember, the heat range of the plug has nothing to do with spark temp. or cylinder temp. (if you have read the post this far, I assume you didn't make that misconception).