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


80 CID Evolution
Engine Performance Dyno Runs
111 HP

Performance and Technical information on Stage 4 engines for Harley-Davidson motorcycles.

Accelerate 'til you see GOD,
then brake.


Stage Four Harley-Davidson engines are "anything goes". This 124 horsepower 80 CID Evolution engine with a turbo charger is in the best tradition of a low cast Stage 4 engine. Make note of the dyno sheet. The horsepower and torque rise at the same rate.

Stage Four Engine Specifications

Year: 1997
Model: FLHT
Bore: 3.5"
Stroke: 4.25"
Displacement: 81 CID
Cases: H-D
Assembly: James Meador
Crankshaft and Flywheel: H-D
Heads: H-D
Intake Valves:
Exhaust Valves:
Valve Springs: H-D Stock
Porting: None
Compression Ratio: 8.5:1 Stock
Pistons: H-D Stock
Cam: Crane 3002-B
Pushrods: Crane Time Savers
Carb: Keihin CV
Carb Jetting Information: .228 Main
Manifold: H-D Stock
Air Cleaner: 
K&N AeroCharger modifed by James Meador
Ignition: V-Thunder Programmable
Ignition Timing: 33 BTDC / 28 TDC @ 4 lbs. boost
Coil: Dyna Single Fire
Turbo Connections
Turbocharger: AeroCharger
Installation by: Owner - Jim Meado
Dyno Tuning Facilities:
Turbo Connection

Tuning notes:

111 HP @ 4100 RPM
124 ft. lbs. Torque @ 4400 RPM
80 CID Evolution

jmead_dyno124.jpg (13619 bytes)

The lower of the two dyno runs is before the "high boost" switch is turned on. For those of you who wonder why the chart gets ragged? This engine is having a few tuning problems at 4500 RPMs. If the tuning issues are solved on this bike, it will be close to 130 horsepower.



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 -+-