Reply To: 1950 Speeditwin 6039 Rods

[JAY T. WALLS]

Here is the real answer, On a Speeditwin that just gets run as a fishing motor and has the clearances it was set up at the factory to run on gasoline/oil it was determined that the hole was no problem. If you wanted to race the Speeditwin at 6500 RPM you would need to set it up with the modern V4 rods and do the modifications to those rods tp be able to run them. In the early days of “C” Service builders got away with working with these stock rods but as RPM’s went up the stock rods would break. When OMC came out with the 75 HP V4 Starflight most all racers got rid of the stock rods and went to the 75 HP rod as it could be modified to run and could stand the RPM. Racers of today run any of the rods up to the 100HP V4 rod. When your building one you do the machining so that the oil holes are up on both rods and the clearances are right for running lots of RPM’s.
Jay