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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

54.9 HP

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

Stock Engines are the starting point for all the modifications. The only way to validate what the performance gain was for any change is to have dyno runs before and after. These are the before runs of several bikes.

Stock Engine (49-states) with no modifications (Baseline)

Stock engines can show up with a wide variation in available power. This particular bike represents a typical dyno run for a stock 49-states bike.

Year: 1994
Model: EVO
Bore: Stock
Stroke: Stock
Displacement: 1340cc
Cases: H-D
Assembly: H-D
Ignition: Stock 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: Stock H-D - 208 Duration Intake- 202 Duration Exhaust - .472 Lift
Pushrods: H-D
Carb: Stock CV w/No Modifications
Carb Jetting Information: Stock
Manifold: Stock
Air Cleaner: Stock
Ignition: Stock
Ignition Timing: 32 BTDC
Coil: Stock H-D Dual Fire
Pipes: Stock with stock mufflers
Dyno Tuning Facilities: CycleRama, Pinellas Park, FL. (813) 546-0889

lr80_549.gif (8216 bytes)

Stock Engine ( California ) with no modifications (Baseline)

Stock California engines show up with less power than the 49-states version of the big twin. This particular bike may not represents a typical dyno run for a stock California bike. Things like air filter, ignition timing, spark plugs and carburetor adjustments can have quite an impact upon engine performance.

RPMs

SAE Corrected Horsepower

Ft. Lbs. Torque

Notes

2000

 19.7

51.9 

 

2500

24.9

52.3

 

3000

30.1

52.7

 Maximum Torque

3500

34.0

51.1

 

4000

36.1

47.5

 

4500

38.1

44.5

 

5000

38.2

40.1

 Maximum HP

5250

   

Stock Rev limiter

As you can see, the California model bikes have much less power than their 49-state cousins.

 

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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 -+-