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I began researching the BSA M20 engine decades ago for a personal project, which was never completed. The extensive notes I made for what was originally intended to be a comprehensive booklet were never fully collated, synchronized, or put in some order of logic, In some cases the same component is discussed in more than one section.
It’s not going to be finished as I wanted it to be, but in my opinion there is much useful data, advice, ideas, comparisons and explanations that will be extremely helpful to an M20 owner. It’ the completee results of my research on obtaining the best speed & performance from your classic BSA “M20” 500cc or “M21” 600cc single.
Your “obsolete” side-valve engine is capable of surprising speed & power, without loss of original appearance or reliability. It's the most modern and complete do-it-yourself literature you can buy to get the most from your M20. Before making any decisions about modifying your motor, get the best help available, and do it right the first time.
I guarantee that you’ll find information in this product you’ve never seen before, and that will help you plan and complete your project. Consider this: if this product saves you from making even a single mistake or bad purchase, or gives you one new idea, doesn’t that make this purchase worth while? The price is a small fraction of what you will invest in the motor - plan more intelligently, and get better results.
This product addresses only the 1946-63 engines, although the information and comments are generally applicable to Norton Model H and similar big side-valve engines.
It includes 45,000 words in 64 pages, plus a copy of the factory maintainance mauual, on the following subjects, some with black & white illustrations, diagrams and charts:
Bore & stroke chart; gives engine size for all bore oversizes and stroker flywheels.
Strokers; details on installing alternate stroke flywheels such as M21, selecting components, where clearancing is necessary, calculating piston compression
distances, skirt lengths, much more.
Cam choices; listing part numbers, duration, overlap, lobe center angle, lift etc. for many BSA factory and aftermarket high-performance cams, with comments.
Porting; improving the existing ports, and creating a new updraft intake port.
Cam phasing; how the power curve of an engine can be altered by changing the position(s) of the cam gears etc.
Building a short-stroke 500cc motor; for vintage racing.
Cylinder head improvements; including pop-up, valve reliefs, etc.
Lightening and improving valve gear; with diagrams.
Stronger valve springs; choices and requirements.
Transmission ratio chart; gives ratios and RPM loss, as well as tooth counts of all factory gearsets for the 4-speed transmission.
Transmission ratio selection; how to pick the best choice for your racing format.
Conversion to overhead valve; using both factory BSA parts, and components adapted from other brands.
Please note: this is not a coffee table book, or a repair manual. It is intended to be a research tool for those who seriously want to improve their M20 engines. I assume that you either are, or have a good working relationship with, an experienced mechanic. If your engine won’t start, float bowl leaks, spark plugs foul, &c. my product will not help you. |
Total price: $9.95. This is not an actual, physical booklet, but an encrypted PDF file which you can read from any computer or lap-top using “Acrobat Reader”.
The PDF format offers advantages over a printed product: the printed text and illustrations may be zoomed much larger permitting close inspection of fine detail. You can read it anywhere (doctor’s office, train station) on your smart phone or tablet.
The file will be promptly e-mailed to you on receipt of payment. There is no “hard copy”. There is no “print-out”. There is no tracking number. You must set your e-mail spam filters and preferences to accept mail from jdiamond@optonline.net. If you do not receive the file promptly, the problem is your e-mail. If you don’t understand what this is, don’t purchase it, there are no refunds. |
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See these Victory Library booklets |
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