ESP Modified 36mm 30.5cc Big-Bore Kit 4HP Chang Yang 31RC
Item #: BB51
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Note: due to heavy demand, this ESP engine has a lead time of approx 5 days.
This custom-built CY31RC engine, available exclusively at WRP, offers simply amazing performance. 30.5cc's of modified power. 36mm bore, 30mm stroke. Hands-down the best stock (unported) 30.5cc motor available. 4+ horsepower, and 5.5+ horsepower with a tuned pipe. Available in black or chrome, and with or without inner clutch. WRP has taken the hassle out of getting a massive 30.5cc motor - we've custom built them for you. The engine comes fully assembled and ready to bolt-on.
So where does the power come from? We start with a Chung Yang stuffed crank CY29RC engine (35mm bore, 30mm stroke - 28.9cc). The 35mm top-end is removed and set aside. We want a larger, 36mm top-end for increased displacement and power! But the stock 36mm cylinder does not have room for the long 30mm stuffed crankshaft, so ESP has machined out the proper spacing. This is a more efficient and reliable solution than stacking gaskets to achieve the needed space, as there is proper spark plug clearance, the piston ring remains in the well-plated area of the cylinder, and the ignition coil remains properly gapped to the flywheel. The squish band is cut so there will be .020"-.025" of squish (using the stock .020" cylinder gasket), and the combustion chamber is machined to get the compression ratio down to 14:1 for running on premium pump 91 or higher octane gasoline. The head geometry is reshaped to the proven standard 'hemisphere' shaped combustion chamber, and the squish area equals 50% bore area, for more efficient burning. These engines are not ported - the port timing and shape is still stock.
For Scooters: Fits Goped brand Sport, Liquimatic, Bigfoot, X-ped, Super X-ped, Super Bigfoot, Go-Quad, Super Go-Quad, Go-Quad 30, GSR26R, GSR29R, and Homebuilders Kit.
For R/C: Fits a wide variety of 1:5 and 1:6 R/C cars, planes, boats, and helicopters. Same mounting dimensions as Zenoah G230RC / G260RC. For cars - fits FG: Marder, Leopard, Monster Beetle, Monster Truck, Stadium Truck, Pajero, Sportsline, etc. Also fits Duratrax Firehammer, Firehammer MT, XTM Grizzly, Carson Attack, HPI Baja 5b, Traxxas Monster Buggy, MCD Rally, MCD Race Runner, MCD 4x4 Monster Truck, and most other large scale onroad and offroad RC cars.
Note: Please allow 5 to 10 working days for delivery
Sale Price : $289.00
Was : $299.00
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