RE: OS 18 TZ vs OS 21 RG
Here is the real debate, are the numbers true corrected numbers? the .21 will make more torque but less RPM's,the .18 will make more RPM's but less torque,Rotational mass will determine the engines ability to move the drivetrain to a certain point with XX amount of weight being pushed.Truth is the .21 will leave you with more options to run hotter fuel and make more mods to produce more power. So what do you really want out of the engine?