Other Stuff > Misc / Open

Anyone seen this before?

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Tomb:
My father had a Royal Enfield Crusader Sport with a worn crank big end on its last regrind, no more shells available, we went to the local crank grinders and asked if they had any shells 10 thou smaller, Austin Allegro were but the outside diameter was bigger so I bored out the conrod big end to fit the Allegro shells, they reground the crank and my father ran the Crusader for years like that. It was 28 years ago, he still has the Crusader.

Another mate had an XL185 with a cam that had eaten the head bearings, I bored the head out bigger, cylindrically ground the cam journals to clean them up, and made a phosphor bronze bush to fit, it was a floating bush with oil holes and scrolls for oil distribution, again ran for years like that and was sold running perfectly.

Not in the same league as the posted mods but when you're an engineer its bread and butter.

K2-K6:
No problem with anything regarding engineering on here, I was just idly looking through stuff on a snowy day and thought it of interest.

As already said,  there's some very clever people around working on all sort of things. The last two examples show how much can be lost if education thinks of everything just has an academic focus without real practical elements to let people discover their own skills and the scope of what they can achieve.
I like going to things like the Goodwood festival of speed,  not just for the vehicles being run up the hill,  but just to spend the day in the paddock with such an extraordinarily diverse range of engineering. It never ceases to amaze me the quality of thinking in creating some of these things. I've seen some very clever solutions and engineering concepts there.
But also on this site,  the shear skill levels,  huge research, and dedication to look after and get things running I feel is inspiring.

Bryanj:
In the big end vein the early 500 triumph twins had a white metalled steel cap and alloy rods, the crank pin being the same diameter as the later shelled sort we had the crank ground then bored the rods to fit shells, which cut into the bolts so put half roundish slots in the shells where the bolts were (new bolts of course) and spent hours filing small slots for the tangs on the shells--worked fine for many years considering it had the fancy alloy barrels and head

K2-K6:
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Is this a real bike or model? Photo looks quite convincing,  but did it exist as prototype?

hairygit:
Looks real enough, although the carbs look wrong.

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