Shop the BMW N55 Build: Parts by Stage

Every part for a built N55, in the order you'll fit it.

Start at the block, then the head studs and rotating assembly, and work out from there. Every part here is listed for the N55 and sold on epoxy54.com.

Customer BMW N55 build running EPOXY54Customer N55 build
Planning the build?Read the order of work in our N55 forged build parts list.
1

Block reinforcement

Like the N54, the N55 is an open-deck block. EPOXY54 fills the top 3/4" of the water jacket for closed-deck strength without machining, and coolant still flows underneath. Do it first. It's block insurance for every part you bolt on after.

How it's done: N54 / N55 closed deck conversion · Installation guide · Fill volume guide

2

Head studs

More boost pushes harder on the head. Head studs clamp harder than the factory stretch bolts and can be reused.

3

Pistons and rods

The core of a built N55. 84.0 mm is the stock bore, 84.5 mm is 0.5 mm oversize. Pick the rod for your power target.

4

Bearings

Fresh rod and main bearings are cheap next to the engine they protect. Measure your clearances and pick the size.

5

Valvetrain

Do the guides and stem seals while the head is apart.

6

Fuel

The low-pressure fuel side is the usual limit on an N55 running E85 or a bigger turbo. Pick the pump module for your chassis.

7

Boost and cooling

More boost means more heat. Upgrade the intercooler and radiator together.

8

Oil and ignition

A catch can keeps oil vapour out of the intake. Tuned engines run colder plugs and healthy coils.

9

Clutch (manual cars)

The factory clutch is next to go once torque goes up.

See it in real builds

N55s and N54s running EPOXY54 are on our customer builds page. Questions about your combo? Call (604) 809-7398 or email support@epoxy54.com.

Shop all BMW N55 parts