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Conn Rod oilways

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Dare I ask a question which I can probably guess ?

Conn rod oilways -should they point outwards to bearing or inwards to crank ?

Norton manual and you-tube combat rebuild does not refer to this although the Haynes manual is specific ?

I have reassembled the crank in the t/chest ready for mating and notice that my Drive side is inwards but my Timing side is outwards. I can still change this but as I've torqued to 43 ( RGM billets) and hesitant to undo and retorque if not necessary

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Oil-spray holes should point outwards on a Norton. You will also need a 6 start oil pump to keep the bottom feed oil pressure high, especially if you have pressure fed rockers as well.

That torque number for the rod caps seem very excessive.   25lbs.ft is the norm unless you have custom made rods. Even then you would need very special bolts to cope with any torquing beyond 30 lbs.ft. Check the number and make certain the bolts have not stretched or the threads pulled.

Norton Big-end conrod bolts /nuts    - 500 & 600cc                       15lbs.ft

                                                              - 650 & 750cc                       25lbs.ft

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I fit bottom shells in the top to block these holes off, I put very shallow but wide slots in the sides of the rods on the big end diameter so the oil coming out of the shells is directed upwards on both sides but I doubt this is needed. Why they put holes in the top shells where the pressure of combustion is at its highest on the shells was an odd decision.

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If by RGM billet, Robert means Thunder Engineering rods then the manufacturer specifies final torquing to 40 to 43 lb ft, so the figures he quoted may not be so excessive after all.

Hi Alan

yes you're spot on, my rods are Thunder Engineering and very pretty they are ! and the torque setting is correct with the bolts supplied

I will turn the rod round as per advice on the oilway , glad to have confirmation

Thank you 

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Hi Robert, yes they are too good to hide away in the engine!

I am using Thunder rods in my 1964 99 mongrel rebuild (99 replacement engine in a 650ss cycle) to replace the pair of odd and battered rods that it was rebuilt with over 30 years ago, before being left in a damp shed.

Good luck with the rebuild.

 

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