mfg Posted December 5, 2020 Report Share Posted December 5, 2020 Crankshafts used in the R2 Studebaker Avanti engine are the same cranks used in the R4 Avanti engine......True? Link to comment Share on other sites More sharing options...
r1lark Posted December 8, 2020 Report Share Posted December 8, 2020 (edited) False...................... Edited December 8, 2020 by r1lark Link to comment Share on other sites More sharing options...
mfg Posted December 8, 2020 Author Report Share Posted December 8, 2020 27 minutes ago, r1lark said: False...................... False is CORRECT! Link to comment Share on other sites More sharing options...
r1lark Posted December 10, 2020 Report Share Posted December 10, 2020 Do we know the exact differences between a standard 289 crank and the R3/R4 cranks? I've seen comments that the counterweights were a little larger, and the fillets on the journals have a larger radius (I think Alan posted that way back when), and also the journal sizes were slightly different to provide slightly more bearing clearance. Link to comment Share on other sites More sharing options...
studegary Posted December 10, 2020 Report Share Posted December 10, 2020 23 minutes ago, r1lark said: Do we know the exact differences between a standard 289 crank and the R3/R4 cranks? I've seen comments that the counterweights were a little larger, and the fillets on the journals have a larger radius (I think Alan posted that way back when), and also the journal sizes were slightly different to provide slightly more bearing clearance. What Studebaker stated upon release of the R3; "Magnafluxed crankshaft of rugged construction, bearings fitted with extra clearance." Link to comment Share on other sites More sharing options...
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