Engines

       You own a cool classic BMW that has a worn out engine or you’re just tired of going slow. You’d like a performance engine for excitement but you don’t want any short comings. 
       The answer is a “state of the art” Metric Mechanic engine for your classic BMW that produces 40-70% more power without sacrificing drivability, reliability, fuel economy, or emissions while lasting 2-3 times longer than your stock engine. The Rally engine drives like a stock engine elevated on steroids with a wide, broad power band that revs smoothly to about 750-1500 RPM over stock. This defines the nature of an MM Rally engine. 

       The key to performance and longevity in a Metric Mechanic Rally engine is the extremely light MM X Strutted Billet piston at just 225-260 grams and Titanium H+ beam rod at only 345-360 grams. This results in a 30-50% weight reduction from stock. Both are made from  US Aerospace tempered alloys of billet aluminum and titanium. From CAD design to CNC machining, we have total control of production and quality.

        An MM Rally engine is proudly made in Richland, Missouri USA for all the world driving enthusiasts who want a superior, powerful engine that’s reliable with civil manners for their classic BMW. A Rally engine will put a smile on your face when you push down on the gas pedal. 
        For more information, check out our engine booklets (found under "technical articles" or on each engine listing), intended to educate and enlighten you on the inner workings of a “state of the art” Metric Mechanic Rally engine. Click on and enjoy the read. 
          Knowledge that enlightens is a beautiful gift,
          From the staff of Metric Mechanic 

MM Rally Engines

with MM's extremely lightweight X strutted billet piston & titanium rod assembly

View all

MM Sport Engines

20% less cost for only 15% less power

View all

MM Rally Engines and Options
Fueled by a passion for innovation, Metric Mechanic Rally engines are the evolution of over 4 decades of constantly working to improve our engines to be the very best.
-Most Metric Mechanic Rally engines will make 35% to 65% more power and have 2 to 3 times the engine life of a stock BMW engine when installed, tuned, and maintained correctly.
-The key, MM Rally engines have extremely light Billet Strutted pistons and Titanium H+ beam rods that are 35% to 60% lighter yet 4 times stronger than stock. This is huge!
-MM's patented Surface Turbulence looks like concentric U shaped grooves machined in the top of our billet piston, increased fuel atomization fora more complete combustion. This reduces detonation, fuel consumption, and emissions.
-Factory engine problems are re-engineered to eliminate reliability issues.
-MM Rally engines are civil. They have a broad power band, smoother running, and good drivability.
-Most Rally engines will require a clutch and flywheel upgrade, with little to no upgrades required to the rest of the drivetrain.
-An MM Rally engine is of the BMW enthusiast who wants a fun daily driver or enjoys track events.
A Rally engine will heighten your driving experience and put a smile on your face.