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


Motor Oil Quality Designations

Performance and Technical information about engine motor oil for your high performance motorcycle.

If you own a new, or fairly new vehicle, to keep your warranty valid you must use an oil that meets the manufacturer's specifications. Virtually all well known motor oils  exceed warranty requirements for US, European, and Japanese motorcycles. But what about the other letters and symbols you find on the bottle, such as API, SJ, SH, CF, CG-4? Or SAE 5W-30?

API stands for the American Petroleum Institute, which publish standards high quality oils must meet.

SJ was adopted in 1996 and covers oils used in gasoline engines in current and earlier passenger cars, sport utility vehicles, vans and light trucks operated under vehicle manufacturers' recommended maintenance procedures. SJ oils may be used where SH and earlier categories have been recommended.

SH applies to gasoline engines in cars, vans and light trucks and indicates that the oil provides improved control of engine deposits, oil oxidization, and engine wear compared to earlier oils. It also provides protection against rust and corrosion.

CF was adopted in 1994 for use in indirect injected off-road diesel engines that use a broad range of fuels, including those with a high sulfur content. It offers effective control of piston deposits, wear and corrosion of the copper-coated bearings used in this type of engine.

CF-2 is formulated for use in two-stroke diesel engines requiring highly effective control over cylinder and ring-face scuffing and deposits.

CF-4 covers oils for use in high-speed, four-stroke diesel engines. They are designed for use in on-highway, heavy-duty truck applications.

CG-4 describes oils for use in high-speed, four-stroke diesel engines, and is suitable for both highway and off-road applications. They provide effective control of high temperature piston deposits, wear, corrosion, foaming, oxidation stability and soot accumulation. These oils are especially effective in engines required to meet 1994 emission standards.

SAE stands for Society of Automotive Engineers. Motor oils have SAE grades, or numbers that indicate viscosity. In other words, the SAE numbers tell you the "thickness" of the oil. The lower the number, the "thinner" the oil.

W signifies its winter rating, showing that it will perform well in particularly cold weather.

When you buy oil, or have it changed, be sure not only to pick the right API rating for your engine, but ask for the SAE viscosity recommended in your owner's manual. Normally, manufacturers recommend multi-viscosity grades, which are suitable for use over a wide temperature range.

Today, motorcycle manufacturers usually specify SAE 20W-50 oil. This will give excellent protection in virtually all parts of the US.

Oil Help

For questions on oil and lubrication, click on Oil Help.



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 -+-