EVO 74 HP

	Harley-Davidson Engine Performance Dyno Runs 73.9 HP
	Performance and Technical information on Stage 2 engines for Harley-Davidson motorcycles.
	Basic Stage Two Engine Design The Stage Two Basic engine represents a more extensive approach to improve engine performance with bolt-on components and a bolt-in camshaft. Most people can perform these modifications themselves. Modifications over stock engine are underlined in the list below. The estimated cost for these modifications ranges from $700 to $1000. The performance return for these changes can be large for the dollars spent. Increases up to 30 HP and 20 Ft.Lbs of torque can be seen on some bikes. The major changes for a Stage Two Basic engine over the Stage One Advanced is the addition of an Andrews EV-46 camshaft. The original cam bearing was removed and replaced with a Torrington. The stock Harley-Davidson push rods were used. Prior testing with the Screamin Eagle 6000 RPM street ignition module had already produced excellent. No reason was seen to change from the SE ingition module. A maximum of 73.9 HP occured at 5950 RPMs, with maximum torque of 78.1 ft. lbs. at 4100 RPMs. The HP and torque curves for this engine combination was very smooth, with a broad torque curve over 70 ft. lbs. starting at 2500 RPMs and extending to 5400 RPMs. Year: 1997 Model: EVO Bore: Stock Stroke: Stock Displacement: 1340cc Cases: H-D Assembly: H-D Crankshaft and Flywheel: H-D Heads: H-D Intake Valves: Stock Diameter Exhaust Valves: Stock Diameter Valve Springs: H-D Porting: None Compression Ratio: 8.5:1 Pistons: H-D Cam: Andrew EV-46 Pushrods: H-D Carb: Stock Keihin CV with DynoJet recalibration kit installed Carb Jetting Information: 180 main jet, 45 slow jet installed Manifold: Stock Air Cleaner: Screamin Eagle K&N Ignition: Screamin Eagle 6000 RPM street module Ignition Timing: 32° BTDC Coil: Screamin Eagle Dual Fire Plug Wires: Magnecor 8.8mm Pipes: Stock headers with HD Slip-on Baloney cuts Dyno Tuning Facilities: CycleRama, Pinellas Park, FL. (813) 546-0889
73.9 HP @ 5950 RPM 78.1 ft. lbs. Torque @ 4100 RPM
Last updated March 26, 2009 Copyright© 1996,1997,1998 Stephen P. Mullen P.O.Box 1085, Oldsmar,FL 34677 All rights reserved Contact SPMullen@nightrider.com Count	The Horsepower Gallery provides an extensive list of bikes , the power they produced and the major engine components.

Basic Stage Two Engine Design