Note that the marks when lined up may not be horizontal, but angled slightly. Once TDC is established the marks on the cam gears should line up. This can be done by eye but a dial gauge is preferable for accuracy. Place a rod through the spark plug hole onto the piston and rotate the engine until the piston is at TDC. Rotate the engine until the cam gears Îtopâ marks are roughly at the top of the wheels. To check the cam timing remove the rocker cover and the spark plug from number 1 cylinder (nearest the crank pulley). The following is recommended before starting to tune an engine:Ĭorrect cam timing is critical for maximum engine performance. Forced induction engines should use a detonation monitor (or similar device) to make sure that detonation is detected before it can damage the engine, and an exhaust gas temperature meter. While it is possible to tune an engine without either, it is not recommended as there is too much guesswork involved. You will need a dyno and lambda meter to tune an engine. It is a guide only the final determination of engine parameters is the responsibility of the person tuning the engine. This is a brief guide to tuning the Honda engine. Technical Information OBD1 Tuning Disclaimer
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