5-7HEAVEN
Well-Known Member
My Project Scooterguy w/Tanaka 47R engine is done!
Project 29er started late last year, but a few changes will be made. The same goals of quick acceleration, brute midrange and 40 mph cruising speeds are in mind.
However, with what I have learned from my center frame engine build, there are issues I'd rather not deal with. Chain jumping and breaking is one. And no matter how well you seal a two-stroke engine, EVERYTHING behind the front of the engine gets covered with a fine mist of engine oil. Besides that, there are interferences with exhaust, Happy Time fuel tank and the rider's legs. Burns on both legs are possible.
This build will use TWO CY460 4.5 hp engines, rack-mounted w/Staton twin-engine gearbox. The NuVinci hub is already mounted on HD double-walled aluminum rims. "Big Apple" 29" tires should work very well for this street application.
The frame being used will either be a steel KONA or aluminum DIAMONDBACK 29" unit. I really like the Happy Time 4-liter fuel tank. It holds enough gas to feed a Tanaka 47R for nine days. Five days of feeding two engines will work for me.
Exhaust and noise might pose issues for the twins. I've run a SBP Happy Time expansion pipe on a center frame-mount 460 engine before. Despite the serious mismatch between exhaust port and SBP pipe, there was a huge power gain, especially at low and midrange. This pipe also made the 460 EXTREMELY quiet, which was surprising. The only downside was that engine oil spray from the muffler was very significant. This shouldn't pose a serious problem if exhaust tubing extends past the rear wheel.
Since both engines have separate centrifugal clutches, their throttles do not need to be synchronized. Methinks that two hand grip throttles and a set of hydraulic disc brakes will simplify matters on the handlebars.
Engine clutch springs are my favorite things to break, especially miles from home. Twin engines should eliminate a total breakdown on the road. If one engine craps out, the other will bring me home.
I can't wait to get this show on the road!
Project 29er started late last year, but a few changes will be made. The same goals of quick acceleration, brute midrange and 40 mph cruising speeds are in mind.
However, with what I have learned from my center frame engine build, there are issues I'd rather not deal with. Chain jumping and breaking is one. And no matter how well you seal a two-stroke engine, EVERYTHING behind the front of the engine gets covered with a fine mist of engine oil. Besides that, there are interferences with exhaust, Happy Time fuel tank and the rider's legs. Burns on both legs are possible.
This build will use TWO CY460 4.5 hp engines, rack-mounted w/Staton twin-engine gearbox. The NuVinci hub is already mounted on HD double-walled aluminum rims. "Big Apple" 29" tires should work very well for this street application.
The frame being used will either be a steel KONA or aluminum DIAMONDBACK 29" unit. I really like the Happy Time 4-liter fuel tank. It holds enough gas to feed a Tanaka 47R for nine days. Five days of feeding two engines will work for me.
Exhaust and noise might pose issues for the twins. I've run a SBP Happy Time expansion pipe on a center frame-mount 460 engine before. Despite the serious mismatch between exhaust port and SBP pipe, there was a huge power gain, especially at low and midrange. This pipe also made the 460 EXTREMELY quiet, which was surprising. The only downside was that engine oil spray from the muffler was very significant. This shouldn't pose a serious problem if exhaust tubing extends past the rear wheel.
Since both engines have separate centrifugal clutches, their throttles do not need to be synchronized. Methinks that two hand grip throttles and a set of hydraulic disc brakes will simplify matters on the handlebars.
Engine clutch springs are my favorite things to break, especially miles from home. Twin engines should eliminate a total breakdown on the road. If one engine craps out, the other will bring me home.
I can't wait to get this show on the road!
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