Re:Rod Roller D-L ratio, cages
Posted by: C Benson (IP Logged)
Date: November 21, 2002 11:25AM
<HTML>Hi,,,Some of the rollers in m/cycle use are .25dx/ .5 L ///Crankpin more likely would use ''square at .25 x .25 ,,,,or .375 x.375 w/ cages on the crankpin prefferd,,,,Loose rollers seem ok if thrust plates are used to control the skewing of rollers,,,Indian used .375 rolls w/ cast iron cages from 1913 to 1951,,,,and back then advertised they held more records than all other makes combined ! ! When fitting a new [assy] we always honed the sleve to get a good fit,,,the variation in the press of the sleeve would be more than the tolerance,,,so this was essential,,,We also graded[ threw out] the rollers,,,NEVER were they all the same size,, never ,,,,order a extra bag of rollers These engines run for years and are abused by idiots daily and stand the abuse,,,,,All those big harleys[ small h on purpose yeh ]]]]that passed U on the freeway ,use this roller system,,,1913--to date something must work,,, Don't quote me on this part from memory,,,, Cast iron cages to 4000 rpm,,,,alloy above,,,,Loose rolls can be used to 4or 5000 but small rollers do better at high speed i think ,,,Vincent used .120 x .200 rolls on crankpin to 5800rpm,,these were loose ,, that was the limit on racing these,,,,,a 30 inch motor prod' 30-40-hp,,, we ran a 30 '' motor to 8400rpm in 1970,,,above 7000 rpm we had FLOUR of CAGE glistening in the oil,,,,but always finnished,,,,,From all this I would guess square rolls loose will work if ya keep a thrust plate in there to hold alignmet,,,Jim has superior experience and engineering knowledge ,,But I have been working in the auto / bike field since 1951 or thereabouts,,so I feel this input may have value to add to the overall view,, Cheers Ben</HTML>