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Reduce  Engine Surging
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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
66.0 HP

Performance and Technical information on Stage 1 engines for Harley-Davidson motorcycles.

Basic Stage one Engine Design

The Stage One Basic engine represents a simple approach to improve engine performance with bolt-on componentst. 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 $700 to $1000. The performance return for these changes can be large for the dollars spent. Increases up to 10 HP and 10 Ft.Lbs of torque can be seen on some bikes.

This dyno run was sent to us by Sam Weatherby from the Seatle area. The dyno run was performed by Eastside H-D/Buell in Belleview, WA. This is the highest performance numbers seen on a late model, stock cam bike. A maximum of 66 HP occured at 4900 RPMs, with maximum torque of 78 ft. lbs. at 4000 RPMs. The HP and torque curves for this engine combination was very smooth, with a broad torque curve over 70 ft. lbs. starting at uder 2300 RPMs and extending to 4900 RPMs.

Year: 1998
Model: EVO
Bore: Stock
Stroke: Stock
Displacement: 1340cc
Cases: H-D
Assembly: H-D
Crankshaft and Flywheel: H-D
Heads: H-D
Intake Valves: Stock Diameter
Exhaust Valves: Stock Diameter
Valve Springs: H-D
Porting: None
Compression Ratio: 8.5:1
Pistons: H-D
Cam: H-D
Pushrods: H-D
Carb: Stock Keihin CV with Yost tuning kit installed
Carb Jetting Information: 180 main jet, 45 slow jet installed, needle 2nd groove
Manifold: Stock
Air Cleaner: Screamin Eagle K&N
Ignition: H-D stock
Ignition Timing: 32░ BTDC
Coil: H-D

Plug Wires: H-D
Pipes: Stock headers with HD Slip-on Baloney cuts
Dyno Tuning Facilities: Eastside H-D, Belleview, WA.

66 HP @ 4900 RPM
78 ft. lbs. Torque @ 4000 RPM

98fxd_sweatherby.JPG (24941 bytes)

 

Last updated June 22, 2006
Copyrightę 1996,1997,1998
Stephen P. Mullen
P.O.Box 1085, Oldsmar,FL 34677
All rights reserved
Contact SPMullen@nightrider.com
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The Horsepower Gallery provides an extensive list of bikes , the power they produced and the major engine components.

 

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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
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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 -+-