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Old 12-01-2012, 09:49 PM   #31
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Sometimes new plugs even if not the correct heat range will run better for a while than old crusty plugs.
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Old 12-03-2012, 01:39 AM   #32
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So would Iridum plugs stay clearer longer, if used as the bottom plugs on my dual plugged engines, both do which tend to foul the bottom plugs?
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Old 12-03-2012, 04:26 AM   #33
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Old 12-03-2012, 05:12 PM   #34
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Originally Posted by supershaft View Post
I have heard the same stories with all sorts of new plug designs. Remember tons of people reporting all kinds of advantages running Autolite plugs in oilheads? It just wasn't so. Still isn't!

Tracking one hp gains is more complicted than swapping plugs for another run. Oil temps and engine temps need to be duplicated not to mention tire temps and traction and that's just the tip of the iceberg. All that takes time and equipment that most for one reason or another don't have. It's hard enough on an engine dyno, let alone wheel dyno's.
I ran the Autolite plugs in my R1100r and they did work better with that engine than the stock plug. It got rid of the surging that the R1100 series was noted for. There are many posts with information on the benefits of this plug in those engines. It never was about hp gains etc, just drive ability issues. I'm not an engineer so I can't explain why or how, but they did affect ( to the better ) the running of the R1100 engine.
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Old 12-04-2012, 01:50 AM   #35
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Yeah, I don't know. I've had/have two R1100S with well over 150k combined on them. I've run about every spark plug that will fit in the hole. Only time they get replaced is when the electrode is gone. And trust me, I've run them to the size of pencil lead. What makes a huge difference on those bikes is taking the time to really tune and synch the throttle bodies. I have never had a surging issue on a stock R1100S which was notorious for surging. I've also tuned it out of RTs and 1150GS by the same methods. None of the 1100/1150's should surge stock. Surging in modern computer controlled bikes is caused by the bike going from rich to lean as the computer tries to maintain a certain fuel map while looking at a lot of variables.

As for longevity in spark plugs with the FI bikes, the BMW plugs seem to last the longest. I think I just have NGK's in the airhead, but have used champion and autolite, and really, they all last a really long time, carbon and oil fouling aside. We are talking about bikes that are 30 or so years old. They just weren't weren't made to run on today's gas all the time. If you want to see a real improvement right away, go invest in some pure gas, and by some champions.
It's eight and a half gallons of gas; and an engine. What more do you need?-- BMW R80G/S

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Old 12-04-2012, 02:41 AM   #36
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Originally Posted by robtg View Post
How many airhead riders are going to notice an extra 1-2 hp from super-wizbang sparkplugs when they seldom see full throttle or more than 5000rpm on their tachometer?
not me .. R80 G/S gets run hard all the time ... err most of the time
have not had a chance to pickup a new set of plugs yet. but for $15 what the heck, it's worth a try.

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