The con rod length would be 'nice to know' because if I knew it I could calculate crankshaft rotation vs. piston position BTDC. That is important for getting accuracy and consistency checking the cam and in timing the magneto. It's true that piston weight and balance factor aren't easily found. But, that's not because these factors aren't important, which they are, it's because in the old days they were "irrelevant" because mechanics simply replaced scuffed pistons with new ones from the manufacturer so the balance factor didn't change. Unfortunately, with those parts no longer available we have to use aftermarket replacements whose weights differ significantly.Simon.Gardiner wrote:I'm not sure that the exact weight of a piston is as important as the size and clearance ... I'd suggest that values like con-rod length and balance factor are also 'nice to know's not 'need to know's - which may be why they're not often found, along with a lot of other information!)
That thought has crossed my mind. I did write a book on Gold Stars (now in its 5th edition), but the amount of information on Black Ariels makes that about Gold Stars seem copious by comparison. Despite that, a shop manual might emerge from all of this, which would be of interest to roughly three other people...john.whiting wrote:If you want that kind of detail on a 1928 motor,you will have to write the book yourself.
cmfalco wrote:.....important to the proper rebuild of a motorcycle that needs to be reliable for 4000 miles with minimal maintenance during that two-week period.
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