How to find the right RC Combustion Engines AI guide

What the AI looks for in RC Combustion Engines

Size class for your chassis

Twelve to fifteen-size blocks fit tenth-scale nitro cars. Twenty-one-size blocks fit eighth-scale buggies and truggies. Larger blocks are mainly for big monster trucks. Mount pattern, clutch diameter and pipe fitment depend on the size class.

Shaft and exhaust layout

Match the crank type (SG or threaded) and the exhaust direction (rear or side) to your mounts, header and clutch. The wrong layout means new mounts, a new pipe and a new clutch, not just a new engine.

Intended use

Off-road and bashing engines favour low-end torque and durability. On-road racing engines favour high RPM, and their port timing is tuned for that. A high-revving racing engine runs poorly and wears quickly in a heavy basher truck.

Starter compatibility

Check whether the engine comes with a pull-start, roto-start or bare backplate for a starter box, and confirm that system suits your car. Many race engines ship without a pull-start, and adding one later costs extra and adds weight.

Parts support

Prefer engines whose piston and sleeve, rod, carb and plugs are sold as separate spares. Engines wear out, and an engine with no parts available is disposable.