All Harley Davidson V Twins have a design flaw with small engine

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Bart S

New member
crankcases, can't control high pressures.? Harley Davidson V Twins with small crankcases present some real challenges when it comes to controlling crankcase pressures. As the pistons rise and fall in their cylinders, the volume of the crankcase changes the same amount as the displacement of the engine.
Without some type of venting system the seals and the gaskets would fail immediately.
Bottom Line: its normal for all HD Engines to leak oil from the breather tube that attaches to the air box., then the oil leaks out and gets all over the engine and on your pants legs, its a mess!
Why don't HD just make a bigger crankcase and forget about the stupid oil tank?
 
I agree. As much as I like HD it's still a puzzle as to WHY so many people want to shell out so much cash for a 50 year old engine design that leaks, vibrates, too heavy, too slow, too thirsty. A Ducatti is the polar opposite -- no leaks, smooth as butter, trim & sleek, fast as hell and gets decent fuel mileage. I don't blame HD for building the bikes that they do -- they're simply filling supply & demand. Heck, they even tried to go high tech with the V-Rod but the public stayed away in droves. As long as there are middle age biker wannabes that like to dress up in leather chaps and salad bowl helmets there will always be a Harley Davidson.
 
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