M20 Low Compression 2.7 Stroker Engine
Build sheet
Customer：Nick- Head：731 with 42mm intake valves fitted (std 885 head) and Rhd porting
- Cam：custom low comp grind 272 duration 11mm lift
- Bottom End：Stock low compression eta 2.7, 135mm rods, 8.5:1 pistons
- Intake：RHD ITB’s
- Exhaust：Generic production headers
This is a popular low cost BMW stroker option performed by taking an ETA 2.7L bottom end and fitting a 323i 731 option cylinder head. These components are a compatible direct bolt on fit.
This engine had already been built by others. Internal components were completely stock however it had a large 290 degree cam which was not compatible with an engine that only has around 8.5-9 : 1 compression. Externally the engine was fitted with extractors, an aftermarket ecu and a cold air intake. Power was a disappointing 123rwKw
Build job was to fit some stock 325i 42mm intake valves and do some basic head porting. Then reassemble with a smaller 272 degree camshaft and fit a set of RHD ITB’s
Power gain was 25rwKw up to a healthy 148.4rwKw (198rwHp) remember this is a very low compression engine, the improvement to the mid range torque was most significant making this a very strong engine both on the road and on the track.
