Engine Performance Dyno Runs
Technical information on Stage 2 engines for Harley-Davidson motorcycles.
Stage Two Engine Basic
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.
This particular engine combination uses 3 very popular
components: The Andrews EV-27 cam, a Crane HI-4E ignition module and a Thunderheader.
Year: 1997 FXDWG
Assembly: Don Anderson
Ignition: Stock H-D
Crankshaft and Flywheel: H-D
Intake Valves: Stock Diameter
Exhaust Valves: Stock Diameter
Valve Springs: H-D
Compression Ratio: 8.5:1
Cam: Andrews EV-27
Pushrods: H-D Stock
Carb: Stock CV w/Yost Power Tube Kit
Carb Jetting Information: 170 main jet 45 slow jet
Air Cleaner: Screamin Eagle K&N filter element
Ignition: Crane HI-4E
Coil: Crane Single Fire
Dyno Tuning Facilities: R&R Cycles, Manchester, NH