"Harley-Davidson Tech Papers"

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Harley-Davidson

British motorcycles

Automotive performance

My Harley-Davidson Articles

Last update:

What Fits What critique 

“What Fits What” booklet critique

Jan 12, 2012

Sifton cams for big twins 

Sifton cams for big twins

Dec. 28, 2011

45 Transmission Ratios 

45 3-speed + overdrive tranmission

Sep. 6, 2010

45, K, XL, UL, V etc. Cam Identification 

OHV, 45, K, KR, XL, UL, V etc. Cam Identification

Jun. 25, 2010

Big Twin OHV oil pump data and comparison 

Big Twin OHV oil pump data and comparison

May 30, 2010

Supercharger Drive Methods 

Supercharger drive methods, including calculations

Sep. 15, 2009

Big Twin 4 & 5-Speed Transmission Ratios 

Big Twin 4 & 5-speed transmission ratios

Jun. 12, 2008

KH & Sportster 4-Speed Transmission Ratios 

KH & Sportster 1956-90 4-speed transmission ratios

Jun. 12, 2008

Evo Sportster & Buell 4 & 5-Speed Transmission Ratios 

Evo Sportster & Buell 4 & 5-speed transmission ratios

Jun. 12, 2008

Alternate Harley-Davidson Cams for the 45 

Alternate Andrews cams for the 45

Apr. 12, 2008

Sportster Cams 

Sportster Cams (Andrews added)

Apr. 11, 2008

45 WLDR & WR Front Drive Magneto 

45 WLDR & WR Front Drive Magneto

Jan. 20, 2008

Converting H-D Drum Brakes to Dual Leading Shoe 

Converting H-D Drum Brakes to Dual Leading Shoe

Jan. 5, 2008

Twin Leading Shoe Drum Brakes 

“Twin Leading Shoe” brakes? What does that mean?

Jan. 5, 2008

Identifying panhead head castings 

Identifying panhead head castings, including S&S dual port

Dec. 19, 2007

Identifying casting numbers 

Identifying early H-D casting numbers

Nov. 24, 2007

British Transmission Ideas for the Harley-Davidson 45 

British Transmission Ideas for the Harley-Davidson 45, illustrated

Oct. 26, 2007

45 Solo Frame Modification Ideas 

45 Solo Frame Modification Ideas (draft copy)

Aug. 28, 2007

Supercharger carburetor choices 

Supercharger carburetor choices

Aug. 8, 2007

Magneto use on Harley-Davidson OHV big twins 

Magneto use on Harley-Davidson OHV big twins

Aug. 2, 2007

Why not just use a turbocharger? 

Why not just use a turbocharger?

Jul. 28, 2007

Re-timing Cams and Pinion Gears 

Re-timing Cams and Pinion Gears

Jun. 23, 2007

Indian Chief, Scout & 741  bore & stroke data 

Indian Chief, Scout & 741 bore & stroke data

May 26, 2007

Planning a nitrous-equipped engine 

Planning a nitrous-equipped engine

Apr. 17, 2007

45 Transmission Torque Plate Ideas 

45 Transmission Torque Plate Ideas (draft copy)

Apr. 1, 2007

Sprung Vs. Unsprung Weight 

Sprung Vs. Unsprung Weight (draft copy)

Jan. 20, 2007

Flywheel Weight vs. Inertia 

Flywheel Weight vs. Inertia (draft copy)

Jan. 20, 2007

45 “Magnum” Comments 

45 “Magnum” Comments, with photos by enigmas

Nov. 24, 2006

Connecting Rod vs. Stroke Analysis 

Connecting Rod vs. Stroke Analysis

May 8, 2006

Motorcycle Chain Types Explained 

Motorcycle Chain Types Explained

Jan. 11, 2006

Keihin CV Carburetor diagrams 

Keihin CV Carburetor diagrams

Jan. 3, 2006

 

Brain-destroying waste of time

Dec. 24, 2005

KR Cam Tables 

KR Cam Tables

Oct. 29, 2005

Side-Valve Compression Ratio Increase vs. Power 

Side-Valve Compression Ratio Increase vs. Power

Jan. 14, 2005

The Otto Cycle: Compression Ratio vs. Efficiency 

The Otto Cycle: Compression Ratio vs. Efficiency

Mar. 22, 2004

Side-Valve Cams by Web-Cam 

Side-Valve Cams by Web-Cam

Jan. 28, 2004

1925-29 Model J Motor Data 

1925-29 Model J Motor Data

Nov. 2, 2003

Piston Position as a Percentage of Stroke Length 

Piston Position as a Percentage of Stroke Length

Mar. 22, 2003

Are Harley-Davidsons That Bad? 

Are Harley-Davidsons That Bad?

Dec. 1, 2002

Spark Plug Selection 

Spark Plug Selection

Nov. 26, 2002

45 Solo Frame Identification 

45 Solo Frame Identification

June 6, 2002

Harley-Davidson Thread Sizes 

Harley-Davidson Thread Sizes

June 7, 2000

Cam Timing vs. Compression Analysis 

Cam Timing vs. Compression Analysis

Feb. 18, 2001

Flywheel Balance Factor Comments 

Flywheel Balance Factor Comments

Oct. 7, 2001

Data Charts

Mikuni VM Carburetor diagrams & data 

Mikuni VM Carburetor diagrams

Mikuni VM Carburetor parts by number 

Mikuni Carburetor part numbers

45 Engine Displacement 

45 Engine Displacement

Tire Size & Width 

Tire Size & Width

U-Series Engine Displacement 

U-Series Engine Displacement

45 Gear Ratios 

45 Gear Ratios

OHV Engine Displacement 

OHV Engine Displacement

Big Twin Gear Ratios 

Big Twin Gear Ratios

Connecting Rod Dimensions 

Connecting Rod Dimensions

Crank-Pin Dimensions 

Crank-Pin Dimensions

Rod Ratio (Rod Length vs. Stroke) 

Rod Ratio (Rod Length vs. Stroke)

 

Mopar Charts

My British Motorcycle Articles (newest text in Italics)

Last Update:

Norton Transmission Ratio Choices 

Norton transmission ratio choices

Jun. 12, 2008

BSA A50, A65 & A70 transmission ratio choices 

BSA A50, A65 & A70 transmission ratio choices

Jun. 12, 2008

BSA A7, A10 & Gold Star transmission ratio choices 

BSA A7, A10 & Gold Star transmission ratio choices

Jun. 12, 2008

Yamaha XS1 & XS650 Transmission Ratio Choices 

Yamaha XS1 & XS650 transmission ratio choices

Jun. 12, 2008

Twin Leading Shoe Drum Brake 

“Twin Leading Shoe”? What does that mean?

Oct. 29, 2007

Motorcycle Chassis Design and Modification 

Motorcycle chassis design and modification

Oct. 24, 2007

Amal pre-Monobloc 274, 275, 276 & 289 carburetor data 

Amal pre-Monobloc 274, 275, 276 & 289 carburetor data

Jun. 9, 2007

Twin Leading Shoe Drum Brake 

“Twin Leading Shoe”? What does that mean?

Jun. 2, 2007

Swing-arm modification for racing 

Swing-arm modification for racing

May 31, 2007

Improving chassis stiffness 

Improving fork action

May 10, 2007

Norton 400, 500, 600, 650 750 & 828 Twin Performance Comments 

Norton 400, 500, 600, 650 750 & 828 twin performance comments

Apr. 26, 2007

JRC, OKO, KOSO, & bgm PWK replica carburetor use on British motorcycles 

JRC carburetor use on British motorcycles

Apr. 12, 2007

BSA A50, A65 & A70 Unit Twin Performance Comments 

BSA A50, A65 & A70 unit twin performance comments

Apr. 6, 2007

BSA A7 & A10 Pre-unit Twin Performance Comments 

BSA A7 & A10 pre-unit twin performance comments

Apr. 6, 2007

BSA A75 & Triumph T150, T160 &c. 750 Triple Comments 

BSA A75 & Triumph T150, T160 &c. 750 triple comments

Apr. 1, 2007

Convert single leading shoe to twin leading shoe drum brake 

Convert a single leading shoe drum brake to twin leading shoe

Mar. 23, 2007

Motorcycle Chain Types Explained 

Motorcycle chain types explained

Mar. 08, 2006

Royal Enfield Comments 

Royal Enfield data

Jan. 26, 2007

Fabricating an Aluminum Oil Tank 

Fabricating an aluminum oil tank

Jan. 20, 2007

British Twin Leading Shoe Brake Comments 

British twin leading shoe brake comments, including Norton

Jan. 20, 2007

BSA M20/21 Side-Valve Motor Mods 

BSA M20/21 side-valve motor mods

May 15, 2006

Amal “GP” data + factory specs 

Amal “GP” data + factory specs, pictures and data as PDF files

May 3, 2006

Amal “TT” factory specs 

Amal “TT” factory specs, pictures and data

May 2, 2006

Wal Phillips Fuel Injector Comments 

Wal Phillips fuel injector comments

Oct. 10, 2005

Triumph “C” Range (350, 500 unit) Twin Performance Comments 

Triumph “C” Range (350, 500 unit) twin performance comments

Feb. 7, 2005

Compression Ratio Increase vs. Power Comments 

Compression ratio increase vs. power comments

Jan. 14, 2005

My Automotive Articles (newest text in Italics)

Last update:

Adapting a V8 intake manifold from another engine 

Adapting a V8 intake manifold from another engine

Oct. 18, 2007

GMC supercharger manifold construction ideas 

GMC supercharger manifold construction ideas

Oct. 18, 2007

Master engine data table 

Master engine data table (new: Rover V8)

Sep. 29, 2007

Long Center Branch Exhaust Header Comments 

Long Center Branch Exhaust Header Comments

Sep. 24, 2007

Exhaust Header Design Comments 

Exhaust Header Design Comments

Sep. 23, 2007

Supercharger compression ratio vs. boost calculations 

Supercharger compression ratio vs. boost calculations

Sep. 17, 2007

Eaton factory superchargers 

Eaton factory superchargers

Sep. 17, 2007

Making a V-8 log manifold 

Making a V-8 log manifold, illustrations added

Jun. 3, 2007

How to increase unibody chassis stiffness 

How to increase unibody chassis stiffness

May 27, 2007

Master engine data table 

Master engine data table

May 27, 2007

Crankshaft journal overlap effects and measurement 

Crankshaft journal overlap: analysis, measurement and effects

Feb. 28, 2007

Edelbrock V-8 intake manifolds 

Edelbrock V-8 intake manifolds: part nºs, use, carburetors, etc.

Jan. 23, 2007

Chrysler 1951-58 hemi commentary 

Chrysler 1951-58 hemi commentary

Nov. 22, 2006

Cam timing vs. compression analysis 

Cam timing vs. compression analysis

Nov. 15, 2006

Crankshaft balance comments 

Crankshaft balance comments

Oct. 5, 2006

V-8 intake manifold comments 

Intake manifold comments

Jul. 31, 2006

Weiand chrysler 6-Pack manifold comments 

Weiand Chrysler RB 6-Pack manifold comments

May 24, 2005

Gas mileage comments 

Gas mileage comments

Jun. 1, 2004

Overdrive automotive transmission ratios 

Overdrive automotive transmission ratios

May 22, 2004

The Otto Cycle: compression ratio vs. efficiency 

The Otto Cycle: compression ratio vs. efficiency

Mar. 22, 2004

How to fabricate and install a screen baffle in your oil pan 

How to fabricate and install a screen baffle in your oil pan

Dec. 14, 2003

Sprung vs. unsprung weight explained 

Sprung vs. unsprung weight explained

Nov. 14, 2003

Common V-8 engine bore center distances 

Common V-8 engine bore center distances

Nov. 5, 2003

DeSoto 1952-57 hemi commentary 

DeSoto 1952-57 hemi commentary

Sep. 19, 2003

Dodge 1953-57 hemi commentary 

Dodge 1953-57 hemi commentary

Sep. 19, 2003

Billet? Cast? Forged? What does that mean? Which is best? 

Billet? Cast? Forged? What does that mean? Which is best?

Aug. 7, 2003

GMC supercharger V-8 intake manifold construction ideas 

GMC supercharger V-8 intake manifold construction ideas (rough draft)

Aug. 4, 2003

V-8 head mill vs. intake manifold mill dimensions 

V-8 head mill vs. intake manifold mill dimensions (rough draft)

Aug. 1, 2003

V-8 cast-iron intake manifold improvements 

V-8 cast-iron intake manifold improvements (rough draft)

Jul. 8, 2003

Power brake vacuum pump installation 

Power brake vacuum pump installation

May 9, 2003

Obsolete TRW part #s for Chrysler, DeSoto, Dodge & Plymouth 

Obsolete TRW part #s for Chrysler, DeSoto, Dodge & Plymouth

Apr. 23, 2003

Piston position as a percentage of stroke length 

Piston position as a percentage of stroke length

Mar. 22, 2003

Combustion chamber shape breathing improvement 

Combustion chamber shape breathing improvement

Dec. 26, 2002

Are American V-8 motors that bad? 

Are American V-8 motors that bad?

Dec. 1, 2002

Connecting rod vs. stroke effects 

Connecting rod vs. stroke effects

Sep. 21, 2001

Chrysler cast-iron exhaust manifold improvements 

Cast-iron exhaust manifold improvements

Aug. 1, 2002

Planning a nitrous-assisted motor 

Planning a nitrous-assisted motor

Jul. 1, 2000

Chrysler MP factory cam data 

Chrysler MP factory cam data

Jul. 14, 2000

Useful Sites

Aluminum alloys and nomenclature decoded

Champion sparkplug nomenclature - decode the part numbers

NGK sparkplug nomenclature - decode the part numbers

H-D factory KR, XLR, etc. high-performance and racing literaure and data

H-D 45/BSA hybrid

KB & Silv-O-Lite pistons home page

Great pictures (courtesy of enigmas) of BSA M21 trans in 45 solo

Fork Geometry, Rake & Trail Explained

Reading & Understanding Spark Plugs, by Gordon Jennings

RB Racing's On-Line Calculators

SU Carburetor Needle Decoder & Search Engine
Looks for slightly different needles based on the one you have - try it out!

Click here for Harley-Davidson stroker flywheels

Knuckle, Panhead
1941-54
Pan, Shovelhead
1955-71
Shovelhead
1972-81
Sportster
1957-*
45 WL, trike
1937-73
74, 80” Flathead
1937-48
80”
84”
86”
88”
80”
84”
86”
88”
80”
4-1/2”
4-5/8”
4-13/16”
4-7/16”
4-1/2”
4-5/8”
84”
86”
88”
92”

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"Harley-Davidson" name for reference purposes only. Not affiliated with Harley-Davidson Motor Co.

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