BMW 320si N45B20S
A problematic engine, but one with so much potential.
BMW’s homologation special was nothing short of phenomenal when it was first released, revving to an astonishing 7300rpm, sportier suspension and much more. Everyone that drove one seemed to fall in love, (us included!)
Unfortunately these blocks are sleeved with recycled aluminum liners, which crack and fail over time. The solution? To re-sleeve with steel liners!
Here at Element Performance we are proud to offer rebuilding and re-sleeving services. With several more of these cars coming to us every month, we are committed to keeping these limited edition cars on the road.
320si N45B20S Services
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![320si engine bay timing chain failed engine cracked liners rebuilt]()
Timing Chains
A common failure point for these engines. Pieces of the guide break down over time and can block the oil pickup and cause engine failure. A job worth doing preventatively!
We use the OEM supplier for our timing chains, so you know it will stand the test of time.
These can be done same day, whilst you wait.
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![320si servicing shim adjustment clearances]()
Valve Shim Adjustment
The N45B20s shares the same drivetrain design as the much loved S54.
An often forgotten servicing requirement for these engines. It is reccomended that shims are adjusted every 30,000 miles.
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![320si e90 rebuild n45b20s engine cracked liners steel aluminum]()
Rebuilds
Full rebuilding services, all new seals, bolts and timing chains replaced.
Looking for performance power upgrades too? Let us know and we can help make that idea a reality!
