11-09-2020, 03:52 PM
(11-08-2020, 01:01 AM)Dave_imp Wrote: I know the above replies have centered around European standards (and BMW), but what about Harley? I know they have added water cooled heads to some of their models, but that rear cylinder must get really hot. I also know Harley is offering a water-cooled model, but a water-cooled Harley just isn't the same (like above responses indicate for our beloved CB1100).Harley and Indian did incorporate many new technologies into modern engines to keep the rear cylinder cooler, from water cooled heads to switching off the rear cylinder. Don't forget that Ducati still has the air-cooled twin in the scrambler range both 800 and 1100, and tho the rear cylinder gets hot as hell, seizing rear cylinder is not a common issue.
Harleys problem with seizing cylinders in the twin-cam was not the lack of cooling actually but a poorly designed oil pump that wouldn't create enough pressure for the rear cylinder. Those things were sorted out.
Little rumours: I was told that Honda is doing the same in the new CB1100 where it will purposely kill the spark on cylinders 2 and 3 if the temperature becomes too high, now I have been trying to fact-check that for a while now without success, but will get to the bottom of it eventually, until then I won't believe it
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