Drilling new conrods

[Bob Culver]

Presumably Austin had some firm basis for the rod drillings. It would be interesting to know just how function. Were the baffles to direct draining oil to the rods? When first introduced Austins would not have been providing for sustained revs beyond normal valve bounce (or near). The trench at the top is agin all theory, often ridged on the trailing side; whether due reduced film as per theory or dirt entry I dunno. On the upstroke considerable oil must enter at the drillings