TF & Speedmaster Flow Tests
Here's back to back tests of a stock SBM OOTB Trick Flow 190cc CNC port and a non-professionally hand ported Speedmaster 186cc port. TF has stock 45 deg valve angle. SM has 50 deg valve angle with valves sunk 0.090". No swirl meter on the first two tests. Swirl meter was used for the last two tests. One port is a right hand port, the other is a left hand port, which changes the swirl direction. The swirl meter reduces flow because of the slight resistance added by the meter.
Here's back to back tests of a stock SBM OOTB Trick Flow 190cc CNC port and a non-professionally hand ported Speedmaster 186cc port. TF has stock 45 deg valve angle. SM has 50 deg valve angle with valves sunk 0.090". No swirl meter on the first two tests. Swirl meter was used for the last two tests. One port is a right hand port, the other is a left hand port, which changes the swirl direction. The swirl meter reduces flow because of the slight resistance added by the meter.
