Basic Stage one Engine Design
The Stage One Basic engine represents a simple approach to
improve engine performance with bolt-on componentst. 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
10 HP and 10 Ft.Lbs of torque can be seen on some bikes.
This dyno run was sent to us by. The dyno run was performed
by Fast Company in Kirkland, WA. This is the highest performance numbers seen on a Twin
Cam 88 equipped with a carburetor. A maximum of 69 HP occured at 5200 RPMs, with maximum
torque of 79 ft. lbs. at 4000 RPMs. The HP and torque curves for this engine combination
was very smooth, with a broad torque curve over 70 ft. lbs. starting at uder 2300 RPMs and
extending to 5000 RPMs.
Year: 1999 FXDWG
Model: Twin Cam 88
Owner: B.D.
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: 9.2:1
Pistons: H-D
Cam: H-D
Pushrods: H-D
Carb: Stock Keihin CV - rejetted
Manifold: Stock
Air Cleaner: Screamin Eagle K&N
Ignition: HD
Ignition Timing:
Coil: H-D
Plug Wires: H-D
Pipes: Stock Exhaust with Screamin Eagle Slip On Mufflers
Dyno Tuning Facilities: Fast Company, Kirkland, WA.
