ProTek 321B Samurai .21 3-port engine

ProTek R/C’s all-new 321B “Samurai” off-road 3-Port engine offers a short-stroke design, turbo head, rear ceramic bearing and an easy-to-tune carburettor with elliptical venturi insert. Other features include a black-coated crankcase and an ABC piston and cylinder. The handcrafted engine has been built by a world-renown Japanese engine manufacturer, to the specs of A Main’s top pro drivers.

Features:
– Custom 7 & 8mm elliptical restrictors
– Ceramic rear bearing
– ABC piston and cylinder
– Ultra hot ProTek P3 turbo glow plug
– Strengthened black-coated crankcase

Specifications:
– Displacement: 3.46cc
– Bore: 16.6mm
– Stroke: 16.0mm
– Practical RPM: 3,000 – 40,000
– Power Output: 2.5hp/34,000 RPM
– Weight: 355g

Source: A Main Hobbies [amain.com]