D
dave1490
Guest
some of the thing,s that can be done to an engine,and why.
This custom-built 27.2cc Zenoah G260RC engine, available exclusively at DDM, offers simply amazing performance and legendary Zenoah quality. 27.2cc's of modified and fully ported power. 34mm bore, 30mm stroke. Get the high-revving benefits of a modified G260RC together with the increased low-end grunt from a longer crankshaft. Aprox 4.25+ horsepower, and 5.5+ horsepower with a tuned pipe. Available in black or chrome, and with or without inner clutch. DDM has taken the hassle out of getting a top-quality modified Zenoah G260RC-based 27.2cc engine - 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 brand-new Zenoah G260RC engine (34mm bore, 28mm stroke - 25.4cc). This is the largest bore Zenoah has available. But we want more displacement for more power, while still keeping the high-quality Zenoah cylinder assembly! So, the stock 28mm crankshaft is removed and set aside. We want a longer 30mm crankshaft for increased displacement and power! But the stock Zenoah 34mm G260RC cylinder does not have room for the long 30mm 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.
After the ESP cylinder spacing modifications are complete, ESP then fully ports the engine. ESP completely tears down the engine and spends hours, cutting in great detail, the porting that will have you grinning from ear to ear. Detail like this is almost impossible to do on a milling machine - even a CNC milling machine.
Compare this to other offerings on the market and you will quickly see that DDM and ESP put power in your trigger finger without putting a huge dent in your wallet. Portwork includes:
1) Cylinder precision ported (exhaust, intake, and transfers enlarged and reshaped).
2) Polished exhaust port (for smooth flow and low carbon build up) and superb rough finish on the intake, cases, and transfer tunnels for better gas/air mixing.
3) Resurfaced intake, exhaust, and spark plug gasket surface on cylinder to insure no leaks.
4) Perfectly matched cylinder transfer tunnels to cases and case gasket matched.
5) Case porting to insure better flow into the transfer tunnels.
6) Cylinder skirt work to aid flow into the transfer tunnels.
7) New gaskets and piston c-clips.
8) Easy to read carb tuning instructions to get the most reliable power from your engine.
9) E.S.P. logo etched into side of crankcase.
This custom-built 27.2cc Zenoah G260RC engine, available exclusively at DDM, offers simply amazing performance and legendary Zenoah quality. 27.2cc's of modified and fully ported power. 34mm bore, 30mm stroke. Get the high-revving benefits of a modified G260RC together with the increased low-end grunt from a longer crankshaft. Aprox 4.25+ horsepower, and 5.5+ horsepower with a tuned pipe. Available in black or chrome, and with or without inner clutch. DDM has taken the hassle out of getting a top-quality modified Zenoah G260RC-based 27.2cc engine - 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 brand-new Zenoah G260RC engine (34mm bore, 28mm stroke - 25.4cc). This is the largest bore Zenoah has available. But we want more displacement for more power, while still keeping the high-quality Zenoah cylinder assembly! So, the stock 28mm crankshaft is removed and set aside. We want a longer 30mm crankshaft for increased displacement and power! But the stock Zenoah 34mm G260RC cylinder does not have room for the long 30mm 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.
After the ESP cylinder spacing modifications are complete, ESP then fully ports the engine. ESP completely tears down the engine and spends hours, cutting in great detail, the porting that will have you grinning from ear to ear. Detail like this is almost impossible to do on a milling machine - even a CNC milling machine.
Compare this to other offerings on the market and you will quickly see that DDM and ESP put power in your trigger finger without putting a huge dent in your wallet. Portwork includes:
1) Cylinder precision ported (exhaust, intake, and transfers enlarged and reshaped).
2) Polished exhaust port (for smooth flow and low carbon build up) and superb rough finish on the intake, cases, and transfer tunnels for better gas/air mixing.
3) Resurfaced intake, exhaust, and spark plug gasket surface on cylinder to insure no leaks.
4) Perfectly matched cylinder transfer tunnels to cases and case gasket matched.
5) Case porting to insure better flow into the transfer tunnels.
6) Cylinder skirt work to aid flow into the transfer tunnels.
7) New gaskets and piston c-clips.
8) Easy to read carb tuning instructions to get the most reliable power from your engine.
9) E.S.P. logo etched into side of crankcase.
IMO, with max hp and torque at 11,00rpm and 8,000rpm, the STATON 18.75:1 box, when used in conjunction with NuVinci hub, is the only transmission that would be able to successfully harness and make full use of ANY high-rpm engine. 
