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Author Topic: Harley Exhaust Systems  (Read 1926 times)
« on: June 25, 2015, 03:17:21 PM »

chris, you forgot to mention the single crank pin that gives that beautiful sound at idle, the shovelhead is the best sounding motor of them all. you can idle them down to about 700 rpm and the sound like no other but it's kind of hard on the bearings. i keep mine around 900 or so. the evo is happier at 1k rpm.

The Harley's crankshaft, being a multiple piece unit, is kind of unique.  The bottom end is total roller bearing - there is only sleeve bearings in the gearcase.  The Pans, Shovels, and Twin Cams use straight roller bearings, the Evos use tapered (Timken style) on the mains.  The rod bearing is triple-row roller, and they have roller cam(s).  Of course, the Evo has one cam, the Twin Cam has two.  And they are dry sump - a "feature" only usually seen in high-performance racing engines.

There are many folks that view the Harley Big Twin design as being "crude" or low-tech.  But its simplicity, serviceability and ability to be infinitely rebuilt is the reason you see Electra Glides with 400,000 miles on them and have never had the bottom end apart.
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