Get XiED(tm)! Performance Parts

Don't let the Harley heat monster ruin your riding.
Reduce  Engine Surging
Improve Throttle Response
Reduce Engine Ping


HD 2007/2008 Engines

High Heat on 2007/08 HD engines

HD 2007/08 Performance Recommendations

Cool your exhaust temperature with the Wide Band O2 upgrade for 2007/08 HD

Harley Camshaft Specification Tables

HD Twin Cam Engine Builds
TC 128 HP 95 CID
TC 100HP Street Engine

The basics of Fuel Injection explained

Rammer Performance Air Cleaners
TC Performance Heads 100+HP

Pro Tuning on a Shade Tree Budget


Engine Performance Dyno Runs
95.3 HP

Performance and Technical information on Stage 3 engines for Harley-Davidson motorcycles.

Stage Three

An 80 CID engine using stock Harley-Davidson cases, cylinders and heads with 95.3 Ft.Lbs. of torque at 4700 rpm's is not your usual cruiser. The maximum power is reading just over 95 Horsepower at 5700 rpm. The motor was specifically tuned for DYNO SHOOTOUTS and DRAG RACING. The power is very strong between 4000 and 6000 RPM. Outside of this RPM range, the engine power drops rapidly. The engine in this particular state of tuning, does not make a pleasant street motor. The very narrow power band limits low speed cruising. In this case, low speed is anything under 3000 RPM's and you have to consider the decibel level of the exhaust. The noise level of an uncorked SuperTrapp pipe is only marginally lower than a top fuel drag bike. This bike is LOUD!!

The street version of this engine combination is the Stage Three Round Two engine with 85HP. Replacing the velocity stack with the Mikuni Air Cleaner and adding the SuperTrapp exhaust system baffles drops the horse power by 10HP, but changes the personality of the engine completely. The SuperTrapp exhaust system with 18 disks and an open end cap has a pleasant engine sound, without being excessively loud. The engine produces smooth, if not exhilarating acceleration from any speed with just a twist of the wrist. The engine is quite content moving the bike from stop light to stop light, or for taking a brisk ride down a deserted country road.

Extensive testing with a variety of other exhaust systems was performed. Straight pipes at 22 inches, 30 inches and 36 inches were tried with no additional horse power gains. A special set of adjustable 3 step pipes was also tried at a variety of lengths with no improvement over the SuperTrapp exhaust system. The most promising exhaust system in matching the power produced by the SuperTrapp 2-1 system was the Cycle Shack slash cut pipes. The testing of the Cycle Shack pipes without the baffles yielded just under 92 horsepower. The Cycle Shack pipes produce a smooth horsepower curve, but do not product the high torque of the SuperTrapp. One curiosity of the test was that the Cycle Shack pipes did not exhibit the rapid drop in power seen when using the SuperTrapp exhaust.

Year: 1994
Model: EVO
Bore: Stock
Stroke: Stock
Displacement: 1340cc
Cases: 1997 H-D
Assembly: Owner
Crankshaft and Flywheel: H-D
Heads: H-D
Intake Valves: Stock Diameter
Exhaust Valves: Stock Diameter
Valve Springs: Crane
Porting: CycleRama, Pinellas Park, FL. (813) 546-0889
Compression Ratio: 10.5:1
Pistons: JE 10.5:1
Cam: 3Suns - 252 Duration - .550 Lift
Pushrods: Crane Time-Savers
Carburetor: Mikuni HSR-42
Carburetor Jetting Information: 175 Main
Manifold: Mikuni
Air Cleaner: Velocity Stack
Ignition: Crane HI-4
Ignition Timing: 32 BTDC
Coil: Crane
Pipes: RevTech SuperTrapp 2-1 open pipe
Dyno Tuning Facilities: CycleRama, Pinellas Park, FL. (813) 546-0889

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Table of Contents
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Modification, Installation, Maintenance and Tuning Index  will help you find most of the information you want on one page.

How to get Professional Tuning Results at home
Testing the Innovate Motorsport LM-1 portable air fuel meter

Profession Tuning on a Shade Tree Budget

Veypor VR2 Data Logger and Instrument Panel
Video Installation and Demo
Purchase VR2

Engine Performance
How to Build a
TC96 2007 Engines
TC88 70HP Stage1  
TC95 128HP Stage 3
TC95 100HP Street
TC96 2007 Stage 1/2
EVO 64 HP Stage 1
EVO 74 HP Stage 2
EVO 82 HP Stage 3
EVO 95 HP Stage 3
883 to 1200 Upgrade
Shovelhead Modifications

New EFI for EVO and TC

Performance Gallery
Horsepower Gallery
Evolution 80
Twin Cam 88/95
Evolution Unlimited
Sportster Unlimited
Drag Strip Gallery
Land Speed Racing Gallery
CV Carburetor
Modifying the CV carb
Tuning a CV carb
Selecting a cam
Install a TC 88/95 cam
Install a Big Twin cam
Install Sportster cams

Camshaft Specifications
Twin Cam

Exhaust Systems
EVO Exhaust Testing
TC Exhaust Testing
Khrome Werks AR100 test
Making Drag Pipes Work

Shop Manual
Carburetor Troubleshooting
Finding Manifold Leaks
Cylinder Heads
Pistons and Cylinders
Belt Drive
Shop Manual Appendix
$20 Bike Lift
Plug Wires
Spark Plugs
Engine Tuning
Nitrous Oxide
Motor Oil
Stutter Box
General Information
WEB Links
Buy Books and Manuals
Performance Calculations
Estimate Horsepower
Estimate 1/4 Mile Time
Estimate Top Speed

Engine Displacement
Exhaust Length
Gear Ratios
Air Density

The Nightrider Diaries
The ramblings of a genius a, a madman and something in between.

Where is Sifton Cams?

Autocom Active-7 tested

Harley-Davidson EFI
-EFI basics explained
-EFI modifications explained

183 HP, 2 carbs, 2680cc

Copyright 1997-2006  Stephen Mullen, Oldsmar, FL -+-