It's purpose is just to kick back and ride, enjoying the vibration and that wonderful exhaust sound. This is a list of verified horsepower figures for a variety of Big Twin Evolution Engines. 20 Years ago Harley-Davidson saved their corporate hide with the Evolution engine. Get a shop manual for your year and model of evolution and read it. Evo oil leak in primary In the '89-'91 time frame, the left side case bearing race can become loose. The Twin Cam gets its name from the fact that it has two cams in the crankcase to activate the valves. In the '70's and '80's, Harleys came with more power. The engine design is often credited with saving Harley-Davidson from bankruptcy after the management buyout and subsequent reorganization that the company went through during the early 1980s. Go to engine and oil pump and you will find the tappet screen and where it is. Now, two decades later, things are heating up. It can be found in Harley-Davidson's 883, 1100 and 1200 XLH Sportster models. 70 to 120 HP $2,000+ Stage Three Evolution Harley-Davidson engines involve any change to of torque at 4700 rpm's and 95.3 Horsepower at 5700 rpm. The rest is history. Twin Cam 88 engines - Manufactured starting in 1999. A common misdiagnosis is a bad seal. Increased reliability, a belt final drive and improved quality managed to catch the RUB wave. The Harley-Davidson Evolution V-twin was introduced in 1983. The current 80 CID engine using stock Harley-Davidson cases, cylinders and heads is able to produce 95.3 Ft.Lbs. The larger Evolution engine, however, was replaced by the Twin Cam 88 engine in 1999. For those who don’t want to go “big inch”, the S&S V80 engine provides a performance solution. The Harley-Davidson Evo was not only more powerful, but it ran cooler and smoother than the Shovelhead. engine to save the company.
It took a number of years past the Evo's birthdate before the aftermarket could gear up.
The torque produced by the engine depends on which bike it is fitted to and the bike's type of fuel induction. Harley-Davidson Motorcycle Performance GuideBig Twin Evolution 80 CID Horsepower Gallery : Performance and Technical information on engines for Harley-Davidson motorcycles. The 80 cubic inch Evolution motor was produced between and 1999. The Harley engine can be re-tuned to make substantially more torque and horsepower with no loss in fuel mileage or reliability. The small Evolution engine permanently replaced the Ironhead engine, and as of November 2010, is still being produced by the Harley-Davidson motorcycle company. You want power, get a Hayabusa. It's true the EVO engine will not hold up to hot rodding (I know a Harley/Harley clone mechanic, and watched him rebuild an 80" EVO) But I don't understand this thing about power with a Harley.