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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

DEWEY'S CUSTOM
Rammer Performance Air Cleaners
TC Performance Heads 100+HP

Pro Tuning on a Shade Tree Budget

   
Harley-Davidson

Engine Performance Dyno Runs
82 HP

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

Stage Three Engine Design

The Stage Three Basic engine represents a more extensive approach to improve engine performance with bolt-on components and a bolt-in camshaft. 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 $1500 to $1800. The performance of this type of engine provides dramatic improvements over a stock engine. An increases of 30 HP and 20 Ft.Lbs of torque was seen over the stock bike.
Development of this engine has been a carefully documented series of changes with the specific intent of creating a Stage Three engine that anyone with reasonably good mechanical skills could do over a weekend. The 82 horsepower obtained by bolting this engine combination together created an excellent perfoming bike.
In moving this bike from a Stage Two engine to a Stage Three engine, a set of Screamin Eagle Evolution heads were added. 
The major changes in making a Stage Two Basic engine over the Stage One Advanced is the addition of an Andrews EV-46 camshaft. The original cam bearing was removed and replaced with a Torrington. The stock Harley-Davidson  push rods were used.
Prior testing with the Screamin Eagle 6000 RPM street  ignition module had already produced excellent. No reason was seen to change from the SE ingition module. A maximum of 73.9 HP occured at 5950 RPMs, with maximum torque of 78.1 ft. lbs. at 4100 RPMs.
The HP and torque curves for this engine combination was very smooth, with a broad torque curve over 70 ft. lbs. starting at 2500 RPMs and extending to 5400 RPMs.

Year: 1997
Model: EVO
Bore: Stock
Stroke: Stock
Displacement: 1340cc
Cases: H-D
Assembly: Stephen Mullen
Crankshaft and Flywheel: H-D
Heads: Screamin Eagle
Intake Valves: 1.90"
Exhaust Valves: 1.62"
Valve Springs: H-D
Porting: None
Compression Ratio: 9.5:1
Pistons: H-D Stock
Cam: Andrew EV-46
Pushrods: H-D
Carb: Stock Keihin CV with DynoJet recalibration kit installed
Carb Jetting Information: 175 main jet, 45 slow jet installed

                                    needle clip in highest position
Carb Idle mixture screw: CCP replacement
Manifold: Stock
Air Cleaner: Screamin Eagle K&N
Ignition: Screamin Eagle 6000 RPM street module
Ignition Timing: 34 BTDC
Coil: Screamin Eagle Dual Fire

Plug Wires: Magnecor 8.5mm
Pipes: Stock headers with HD Slip-on Baloney cuts

Gaskets: James Gaskets
Dyno Tuning Facilities: CycleRama, Pinellas Park, FL. (813) 546-0889

81.7 HP @ 5700 RPM
87.1 ft. lbs. Torque @ 3900 RPM

97fxd_0820.jpg (54592 bytes)

 

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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
Shovelhead
Sportster
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
Camshafts
Selecting a cam
Install a TC 88/95 cam
Install a Big Twin cam
Install Sportster cams

Camshaft Specifications
Twin Cam
EVO
Shovel
XL


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

SHOP TALK
Shop Manual
Carburetor
Carburetor Troubleshooting
Exhaust
Ignition
Finding Manifold Leaks
Camshafts
Cylinder Heads
Pistons and Cylinders
Clutch
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
Miscellaneous
Performance Calculations
Estimate Horsepower
Estimate 1/4 Mile Time
Estimate Top Speed

Engine Displacement
Exhaust Length
Gear Ratios
MPH at RPM
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 -+-