Kolm BX-310-4

The BX-310-4 is exactly the flat four twin that so many have waited for. It is now at last possible to build 33% to 50% scale models powered by a 4-cylinder four stroke engine.

The Kolm BX-310-4 is ideal for all models up to 50 kilos (110 lbs) in weight and with the optional electric starter leaves nothing to be desired.

Nickel-Silicon plated cylinder surfaces, far lighter than steel cylinder liners guarantee high wear resistance

Assembled heat-treated steel crankshaft with Tungsten balance weight inserts

Conrods are CNC milled from high strength steel, and have a spindled bore surface for the big end needle roller bearings

Plain bronze small end bearings

Single camshaft acting on overhead valves by pushrods

A light weight, low inertia valve train allows relatively high RPM

Crankcase CNC milled from high-strength aerospace alloy

Excellent Müller-Microprocessor-Ignition developed by Günter Müller in Germany, now made in Austria by Kolm Engines

Valves and pistons are manufactured at Kolm Engines in Austria on modern CNC machines

Two Walbro carburetors HDA-48D

Engine length adjustable by longer and shorter optional prop hubs

Rapid spares delivery and repair service from Germany by Toni Clark practical scale GmbH. 

Each and every Kolm engine is tested in the factory and run for thirty minutes. Of this test a detailed proof certificate is supplied.