View Full Version : Gear drive timing set

03-05-2011, 12:03 AM
Has anyone ever put a gear drive timing set on a ski boat motor? Would there be any advantage? If it was a "quiet" set, how loud would it be?

03-05-2011, 12:38 AM
They sound cool on the street, but I think after a day or two on the lake you would have your fill of the sound they make. Especially since the driver and observer seat are so close to the front of the engine.

03-05-2011, 08:40 AM
The only advantages to a gear set is that you don't have to worry about skipping a tooth (chipping a tooth is a possibility) also they keep the timing more accurate above 5000 rpm so for our boats its a waste. Disadvantages are the gear sets cause some unusual harmonic vibrations that can travel to the camshaft and cause problems especially on computer controlled engines with knock sensors, gears use more horsepower than a chain, even quite gears are noisy, can be costly to install modifing covers, oil galleys, metal shavings getting in motor alignment problems with drive belts etc., If your looking for more hp out of your timing set a belt setup is a better option. The best option imo replace with a quality timing chain set (there is a reason that indmar and ilmor dont change those items, chains are the most reliable)