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BernieAre you sure the gear on the RHS is to drive a distributor ?It looks more like an air compressor to me. Probably to feed the air brake system.If that is the case it will not matter too much about the gear ratio to drive it.I guess the AEC engine prototype would be a diesel so would not have a distributor as such, but a fuel pump for the injectors.Phil
Thanks the pictures do help.Well that's my thoughts anyway, others may have different suggestions.
I would guess since the PDs work out to nice even metric numbers you are working in mod gears vs DP? Then it might not help so much, but I really like this gear design/animation page. https://geargenerator.comYou can set up any train you like, control what is driven by what etc. The only thing it doesn't give is centre distances, but that can be calculated from the PC and angle you input...or down load a dxf
You should be able to draw the gears using teh FMGears tab in Fusion 360 to see how they fit within the casing.Well that's my thoughts anyway, others may have different suggestions.