DIY Network

Gas-Powered Model-Airplane Engines -- 4-Stroke Engine Test From "Radio Control Hobbies" episode RCH-203

In this segment, Chris Chianelli and model-engine expert Randy Linsalato demonstrate the procedures in tuning a gas-powered 4-stroke model engine.

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	Figure A
	Figure B
	Figure C

4-Stroke Engine Test

Important: This demonstration shows provides some of the basic information for operation of this particular model engine. There are variations in operation for each particular model. Read and carefully follow the manufacturer's instructions that come with yours, whether it is this particular model or another. Additional information about assembly as well as running, troubleshooting and fine-tuning the model can be found in the manufacturer's instructions.

• The monstrous Saito 170 4-stroke engine (figure A and B) is bigger and may seem more intimidating than the 2-stroke model fine-tuned in the previous segment, but the adjustment is done in the same way -- using high-speed and low-speed needle-valve adjustments.

• The 4-stroke engine utilizes rocker arms visible on the sides of the engine (figure C). Since this is a ringed engine, it can be run at a very rich fuel/air mix.

• To break in this engine, it's advisable to bench adjust it for optimum operation, and run it through 3 or 4 tanks of fuel. For the first tank, avoid running the engine above 4000 rpm.