Is this normal??
Stellar HDF Member
Joined: Aug 2008
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From: Southern Nevada (Pahrump)
Yep, forgot about exhaust types....
Extreme HDF Member
Joined: Sep 2010
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From: Phoenix '53, '88, '09 Big Twins
on the old bikes, you'd tune the carb to the rear cylinder, leaving the front a little rich. or fiddle with sparkplugs
mike
Tourer
Joined: Sep 2011
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From: Long Island
It is a 60/40 system and I have no explanation for it. Would like to hear the explanation from a Harley engineer. Or anyone.
Elite HDF Member
Joined: Jun 2007
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From: NW Arkansas
Normal, my left muffler never gets too hot that I can't lay my hand on it......stock header on a 08 Ultra, with 4" Jackpot mufflers.
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Joined: May 2011
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From: Los Angeles, ca.
I also believed the rear cylinder runs hotter than the front as it does not have very good air flow, and what air flow it gets is most warm air passing by the front cylinder. I also have a 2004 Roadstar 1700cc, and that back cylinder runs much leaner than the front, but both pipes are equally hot (you cant lay your hand on either one)
I just changed pipes and thought something was not right..
thanks for the replies
mike
I just changed pipes and thought something was not right..
thanks for the replies
mike
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From: earth
I also believed the rear cylinder runs hotter than the front as it does not have very good air flow, and what air flow it gets is most warm air passing by the front cylinder. I also have a 2004 Roadstar 1700cc, and that back cylinder runs much leaner than the front, but both pipes are equally hot (you cant lay your hand on either one)
I just changed pipes and thought something was not right..
thanks for the replies
mike
I just changed pipes and thought something was not right..
thanks for the replies
mike
Your factory pipes, by design routes most of the exhaust to the right side so it stands to reason that the left is a little cooler. Why are they built that way? Best guess is to get some of the performance benefit of scavenging while maintaining the widely desireable symetrical appearance.
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Joined: May 2011
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From: Los Angeles, ca.
Thanks fabrik8r
I think you nailed it. I was just in awe of how much difference there was in temperature between the two pipes in a completely cold engine. Like I stated I had just changed mufflers and had not noticed this until now....
Thanks for the explanation...
mike
I think you nailed it. I was just in awe of how much difference there was in temperature between the two pipes in a completely cold engine. Like I stated I had just changed mufflers and had not noticed this until now....
Thanks for the explanation...
mike
Your factory pipes, by design routes most of the exhaust to the right side so it stands to reason that the left is a little cooler. Why are they built that way? Best guess is to get some of the performance benefit of scavenging while maintaining the widely desireable symetrical appearance.