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


Stage 2 Engine Development and Modification

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

Stage Two Harley-Davidson engines involve Stage 1 changes plus changes to some internal "bolt-in" engine components. These "bolt-in" modifications include camshafts and milling of the heads to increase compression. Some special tools and knowledge of engines is required to perform stage two modifications.
These modifications will provide from 60 to 80 horsepower at the rear wheel of a late model 80 CID Harley-Davidson big twin Evolution engine, depending upon the condition of the engine and the components used.

All the Stage One parts plus the parts listed below can go into a Stage Two engine. The components listed have all been tested on Harley-Davidson engines. When installed and tuned properly, these components will improve the rear wheel horsepower of your big twin engine. Items that are not listed here have not been tested or do not improve rear-wheel horsepower of your motorcycle. An example of not being listed are drag pipes. Drag pipes, even properly tuned, will not improve the street performance of your H-D.


Some of the most popular cams for use in Stage 2 engine are listed below with an approximate grouping of cams with similar specifications and performance.

Bolt-in Camshaft Selector

Bike and riding Style Heavy Bike
Heavy Bike Performance or Light Bike Touring Light Bike

RPM Range

Idle to 4500 1500 to 5000 2000 to 5500
Andrews EV-13
EV-27 EV-3
Crane Fireball 300 Fireball 310 Fireball 316
Screamin Eagle SE-3 SE-4 SE-1
V-Thunder EVL-3000 EVL-3010 EVL-3020

Bolt-in Camshaft Selector
TWIN-CAM 88/95

Bike and riding Style Heavy Bike
Heavy Bike Performance or Light Bike Touring Light Bike

RPM Range

Idle to 4500 1500 to 5000 2000 to 5500
Andrews TW-21
Crane HTC 300 HTC 310 HTC 316
Screamin Eagle SE-203 SE-203

Any camshaft with with a duration under 250 degrees and lifts below .500 can be considered bolt in. Extensive testing by Jerry Branch (Branch Flowmetrics) indicates that any group of camshafts with similar lift, duration and lobe separation angles tend to perform in similar fashion. To attempt to identify and test every bolt-in camshaft would be time consuming and expensive. The Motorcycle Performance Guide staff has reviewed J. Branch's results and agrees with the results. In practical terms, this means that the Crane 300 and EV-13 will provide about the same power, so goes the Crane 316 and EV-46. This also means that you will see only minor differences between the EV-13 and EV-27.

Need to find a cam to meet your specifications? Look through the Motorcycle Performance Guides complete list of Harley-Davidson camshafts for BIg Twin, Sportster and Twin Cam 88 engines.

Build a 74 HP Stage 2 engine.
82 HP XL
84 HP XL


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 -+-