SOHC.co.uk Forums > CB750
What's this all about ?? Aftermarket CB750 bearing shells for sale on Amazon?
AshimotoK0:
--- Quote from: K2-K6 on May 19, 2024, 07:01:50 AM ---
--- Quote from: Bryanj on May 17, 2024, 05:35:02 PM ---That would mean you could regrind a crank, does anybody know if the journals are hardened cos i dont
--- End quote ---
If needing treatment after grind, process like this available https://aalberts-st-heat.co.uk/tufftride-qpq#:~:text=The%20Tufftride%C2%AE%20process%20of,the%20characteristic%20black%20surface%20finish. Suitable for materials that can't accept nitride treatment.
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My mate Graham Curtis refurbishes Honda cranks of the pressed together variety (must have done at least 100) and I asked him about the depth of hardening on those. He reckons it's around 2mm on the crankpins ... yes I know it's not a plain bearing crank but gives an indication. He told me the crank parts are copper coated in areas where the parts are not hardened as part of the hardening process.
K2-K6:
Yes, you'd definitely need a "depth" hardened surface to run rollers or balls on, thats in comparison to plain bearing arrangement.
AshimotoK0:
Interesting that bikes like the DOHC 750 and CB400N used the same size shells as the 1st CB750 and also for the DOHC that there is an extra size available 'Bearing E ... Blue'. I always knew that CBX1000 shells fitted the SOHC fours though.
K2-K6:
Very interesting within Honda, is that they've built so so many different types in configuration and application, all good to compare design traits etc.
The three mentioned above all allmin the same area in regard to bhp per cylinder, more importantly loading (torque) and speed all being close to specify a bearing for use in.
The detail in your thread about prototype 750, the small original big ends suggest it either started as a roller bearing crank or sized upward 8f origin in plain bearing, to control crank twist perhaps.
Around that time were the car engine 4 cylinder too, with roller bearing crankshaft.
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