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


Unlimited Sportster Engines
Horsepower Gallery


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

This is a list of verified horsepower figures for a variety of Sportster Unlimited Displacement Engines. The list provides information on the maximum horsepower recorded, the type of engine cases, the engine displacement in cubic inches (CID), head type with who did the modifications, type of camshaft, type of carburetor, type exhaust system, owner of the bike, the type of frame the engine was mounted in and the source of the data. Data sources used in building this list include Cycle-Rama, AMI, and various magazines. All horsepower figures listed here were confirmed on a dynamometer.

To have your bike listed here, send a copy of your dyno sheet data along with the other information listed in the Horsepower Gallery to us at the V-Twin Café.

Max Torque Engine Case CID Heads Compression Camshaft Carb Pipes Owner Bike From
100   HD 89 HD   Andrews N83 Mikuni HSR-45 Drag Pipes James Reader 1995 XL Dyno Run
105 103 S&S 89 S&S 12.4:1 Andrews BV S&S Super G Custom 2-1 Jim Livermore 1998 Custom Hillside Motorcycle Munnsville, NY
114 92 HD 79 S&S Greg Coen 11.5:1 Red Shift .585" S&S Super D Custom 2-1 Mo Coen Kosman Drag Greg Coen Motor Company
117 99   88 STD   Red Shift .643" S&S Super D ThunderJet Carl's   1991 XL Southside Johnny Glendale, AZ
120 99   88 STD
Reed Racing
11.5:1 Red Shift .643" Mikuni HSR-45 Kooks Header Steve Saunders 98 Buell S3 Flash Engineering
130   S&S 107 STD   Red Shift .723" Zipper's S&S Super D Custom Drag Smitty Smith 1999 XL American Iron Feb. 2000
133 120 HD 74 STD John Sachs 8:1 HD 883 AeroCharger w/40mm CV Kooks AreoCharger Jim Dye 96 Buell S2 World Wide Dynamics
136 176 HD 89 STD by John Sachs   Sachs Aerocharger w/40mm CV Aerocharger Jim Luzzi . World Dynamics
137   HD 89 HD   Andrews N83 Mikuni HSR-45
Nitrous Oxide
Drag Pipes James Reader 1995 XL Dyno Run
143 129 S&S 100 Zipper's Billet   Redshift Zipper's S&S Super D Bassani George Crim and Art Northrup 94 XL Dyno Run
Aaron WIlson
164   HD 89 HD   Stock HD Mikuni HSR-42
Nitrous Oxide
AeroCharger Joel Cox 1995 XL Dyno Run
176 140 HD 79 STD by John Sachs   Sachs Aerocharger w/40mm CV Aerocharger Jim Dye Buell World Dynamics


Table of Contents
Search the site 
Nightrider COPYRIGHT

Ask us a Question

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 -+-