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Big End Bearings

Norton Models (not Commando or P11)

Re: Big End Bearings

Postby Rohan » Thu Jul 28, 2016 3:21 pm

acotrel wrote: As I understand it the Triumph Trident cranks were made planar then twisted to give the journal offsets - sounds butcherous to me.


Thats what forging stuff is all about - keeps the grain of the metal structure to advantage.

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Re: Big End Bearings

Postby annajeannette » Tue Aug 09, 2016 6:15 am

Possum wrote:I have a 650cc crank with big-ends at 1.700" diameter and a bit ordinary looking, so it needs a regrind and new large journal end shells

Is it possible to get new journal end shells at 1.690" diameter? (0.060" oversize)

If so, where?

Cheers, Possum


Journal end shells do not go to this size so its a large end journal end rebuild with hot metal spraying a specialist job or find a standard crankshaft

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Re: Big End Bearings

Postby annajeannette » Tue Aug 09, 2016 6:36 am

Possum wrote:I have a 650cc crank with big-ends at 1.700" diameter and a bit ordinary looking, so it needs a regrind and new large end shells

Is it possible to get new large end shells at 1.690" diameter? (0.060" oversize)

If so, where?

Cheers, Possum


Warning make sure you know what oil pump you have on the bike has there are two types the early type the 3 start pump and the later 6 start pump both you have to use different large end shells early 650 and early atlas used end shells with No oil Holes in the shells the later type did have oil holes so do not fit early bike with later large end shells unless you use the 6 start oil pump has you have oiling problems and quickly worn large journals so now you know the 6 start oil pump came out after 1964 a Plumstead up rated the old oil pump to run a double the speed by the gearing IE the Six Start oil pump

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Re: Big End Bearings

Postby dicklee » Wed Mar 29, 2017 6:17 pm

The V12 Jaguar cranks were made by forging and twisting. The process is done hot, and usually followed by further heat treatment, so there isn't a problem with residual stresses. It allows a complex crank to be made in relatively(!) simple forging dies.

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