Dinan vs. RD Sport 4.6L M3 Stroker Motor Shootout

Dyno shootout by Alekshop:

From the time Dinan and RD Sport each introduced their 4.6L stroker motors, it’s always been our dream to have a dyno shootout to see how they would match up against each other. Both companies make 4.6 liter stroker motors, but each took a slightly different approach in their design. Dinan chose to design a shorter stroke and bigger bore, while RD Sport chose to design a longer stroke and slightly smaller bore. The shorter stroke approach gives the Dinan stroker a 4608 cc displacement, and the longer stroke approach gives RD Sport a 4619 cc displacement. Practically speaking, both engines are the same displacement, but in theory the longer stroke of the RD engine should give it a torque advantage. We always wanted to put this theory to the test, so we called up our buddy “Mr. Data Collector” who would set it up and collect all the data.

The Dinan stroker motor was purchased by Alekshop customer “Dray-M3.” This car is well known to Alekshop dyno days and has been dyno’d on three previous occasions. Dray-M3 always wanted to dyno his car, but we wanted to wait until Alekshop customer “Sleeper” finished his RD Sport stroker so we could dyno them together and turn this into a mini stroker shootout. But scheduling this shootout wasn’t as easy as it sounds. It seemed that everybody’s schedules never meshed. After six months of trying, we finally found a one-week window of opportunity where everybody was available. Not wanting to pass up this golden opportunity, we set it up and made it happen.