The engine is a stressed member of the chassis, which significantly reduces overall weight and makes for a stiff chassis and precise handling. The camshaft profiles and Variable Valve Timing (VVT) phasing are also designed to match the desired performance of this engine.The length and shape of the intake velocity stacks, combined with the airbox volume, are tuned to maximize performance across the engine speed range.Pistons are shaped to match the combustion chamber dimensions of the cylinder heads.Cylinder heads have smaller valves and port dimensions, and a different combustion chamber shape, which increases the velocity of flow through the combustion chambers at lower RPM, and increases torque output at low and midrange RPM (providing up to 10% more torque from 3000 to 6000 RPM).This one’s just like the 1250 Rev Max we’ve already discussed at length, but Harley rates this one at 121 horses instead of 150 – though it claims the same 94 lb-ft of torque for both engines. The 1250cc Revolution Max 1250T engine is the mechanical heart of the Sportster S, a liquid-cooled V-Twin engine tuned to make big torque at low revs, with a torque curve that stays flat through the powerband – engine performance designed to deliver strong acceleration from a start with robust power through the mid-range, quoth H-D. From stop light to stop light, and corner to corner, the Sportster S model offers riders extraordinary power and performance and creates a new standard for the most enduring Harley-Davidson model.” Since 1957, we must admit, really is pretty enduring. A taut, lightweight chassis and premium suspension deliver responsive, intuitive handling. A 121-horsepower Revolution Max 1250T V-Twin engine puts the Sportster S rider in command of unrelenting, on-demand torque. This one’s “designed to deliver a thrilling riding experience and ushers in a new era of Sportster performance. The new 2021 Harley-Davidson Sportster S that was unveiled this morning looks so much like the earlier prototype we dubbed Custom 1250 and already closely examined, most of the conjecture is already over except for the how much and when.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |