Technical > Matt Shaff's Engine Shop

Rod bearing clearance

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Paul New:
I can tell you with my GRP rods I run Clevite CB663-HND in my combo and run .0035 clearance granted when I ordered my crank I ordered it sized wheee I wanted it.

THE FRENCHTOWN FLYER:

--- Quote from: Dunc the Funk on May 23, 2020, 07:07:34 AM ---Thanks for that advice re machining, that's the stuff I just don't know yet. Just referred to my crank figures. After block & caps re-sized & align honed I used King X bearings on them looking for 1 thou and gained a consistent 1.5 thou on all 5 which was actually better. Probably visit machine shop next week, I'd like to know how round the rod bores are too.

--- End quote ---

My crankshaft grinder does not trust Plastigage readings to give an accurate clearance measurement. Use a dial bore gauge.

dreracecar:
Unless you cycle the rods constantly. you should run alu rods a couple times and then pull them for re-sizing anyway to straighten out the roundness in the bores after they take their first set-- doing this increases the lifespan on everything and get an accurate measurment

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