Stage Three Engine Design

This Stage Three  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 $1200 to $2000. 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 engine is an excellent example of what a Twin Cam 88 engine can do. This big bore kit has not been added to this engine, making the results even more impressive.  Note the broad torque curve on this engine.

For those of you who are interested, the stock bike dyno run is also shown. A stock bike makes 59.1 horsepower with 72.4 ft. lbs. of torque.

Year: 1999 FXD
Model: Twin Cam
Owner:
Bore: Stock
Stroke: Stock
Displacement: 88CID
Cases: H-D
Assembly: H-D
Crankshaft and Flywheel: H-D
Heads: BC Gerolamy
Intake Valves: Stock Diameter
Exhaust Valves: Stock Diameter
Valve Springs: H-D
Porting: None
Compression Ratio: 9.0:1
Pistons: H-D
Cam: Andrew TW-37
Pushrods: H-D
Carb: CV w/SE jet kit
Carb Jetting Information:
Manifold: Stock
Air Cleaner: Screamin Eagle K&N
Ignition:
Coil:
Plug Wires:
Pipes: Stock header pipe w/Cycle Shack Slip-ons
Dyno Tuning Facilities:  Greg Coen Motor Company