General Engine Description, The average engine life expectancy is about 140,000 to 150,000 miles.
But some owners feel the M3 lacks low to mid-range rpm “grunt”. In other words, it doesn’t pull to their liking below 4,500 rpms. M3 Engine Anatomy. A 16.5% flow increase is achieved by machining the intake ports to 29.5 mm (26 mm stock). See “Metric Mechanic HiFlo ST M3 Head” chart on the next page. By using stock cams and porting, the engine ends up with a very flexible power band on the street. Stock camming also helps the engine pass emissions. Metric Mechanic 29.5 mm M3 Intake Ports compared to stock port sizes which are about the diameter of a quarter. MM Surface Turbulence valves with Manganese Bronze valve guides. Valve Springs: Our springs are taller with a slightly reduced wire diameter. The stock spring exerts 78 lbs. of pressure on the valve seat and 185 lbs. on the nose of the cam at full lift. Our MM valve increases the seat pressure to 90 lbs. Exhaust Flow : On a well designed engine, exhaust flow would be 85% of the intake flow. On the stock M3, exhaust outflows, Timing Chain Assembly. BMW M3 Value adjustment :The M3 valve adjustment is .013” plus or minus .001”. This space is created by changing out an assortment of 33 mm diameter shim pads ranging in thickness from 3.25 mm to 4.35 mm.
Tags : bmw m3 s14 engine, manganese bronze, bmw m3, surface turbulence, stock cams, intake ports, wire diameter, stock port, chain assembly, exhaust flow, engine description, valve adjustment, street stock, valve guides, camming
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