OE Oil Cooler Blanking Plate

What It Replaces

The standard H2 engine carries an oil/water heat exchanger mounted to the block — functionally similar to a Laminova core, transferring heat between the oil and the coolant. On the motorcycle it does two useful jobs: it sheds oil heat under sustained load, and it brings the oil up to temperature quickly from cold by borrowing heat from the coolant.

Our blanking plate fits in its place. Oil leaves the block, passes through the plate and returns to the block directly, with the heat exchanger and its associated coolant plumbing removed from the engine entirely. It fixes with four bolts and requires no additional pipework of its own.

Why Delete It In a Car?

In a car installation the OE heat exchanger is usually redundant and frequently in the way. Almost every serious H2 conversion runs its own oil cooling — a remote cooler, or a Laminova-type exchanger positioned to suit the car — because the engine is no longer sitting in a motorcycle's airflow and the coolant system has typically been re-engineered around a car radiator anyway.

Once you have your own oil cooling, the factory unit becomes a second, uncontrolled heat path tied into a coolant circuit you have already changed, plus a lump of hardware occupying space on the side of the block. Removing it simplifies the plumbing, frees up packaging, and puts oil temperature management where you can actually control it.

It also pairs naturally with a dry sump conversion, where the oil circuit is being redesigned from the ground up and cooling is best specified as part of that system rather than inherited from the motorcycle. The plate is sold separately from the dry sump kit, so it is only added where remote oil cooling is actually being used.

An Honest Caveat

This part removes cooling capability. That is the point of it — but only if something else is doing that job. Fitting a blanking plate to an engine with no other oil cooling provision will run oil temperatures higher than the engine was designed for, and on the high-compression Z H2 and H2 SX variants, elevated oil and charge temperatures are exactly what erodes your knock margin.

Equally, the loss of the coolant-to-oil warm-up path means the oil takes longer to reach temperature from cold. In a road car used for short journeys that is worth thinking about; in a track or competition car it rarely matters.

None of this is a reason to avoid the part. It is a reason to specify the oil system as a whole rather than component by component — which is a conversation we are happy to have before you buy anything.

Engine Fitment

Suitable for the supercharged H2 family — Ninja H2, Ninja H2R, Ninja H2 SX and Z H2. The variants differ in compression ratio, camshafts, cylinder head and supercharger specification, but those differences do not affect this mounting.

If your engine has been previously modified around the oil cooler mounting, or you are unsure which variant you have, tell us before ordering. Our H2 engine reference explains how to identify an engine properly — the engine number prefix alone will not tell you.