Want more performance from your older in-line four or six cylinder engine including Chrysler flathead 218, 230, 237, 251 & 265 L6 and Slant 6 170, 198 & 225; Chevrolet 216, 235 & 261 and 153 L4, 194, 215, 230, 250 & 292 L6, Ford 144, 170, 200, 240, 250 or 300 L6? Having trouble finding speed equipment that is anything more than “dress-up” parts?

    A reliable and inexpensive Eaton supercharger can be adapted to your engine without complex machining or welding to provide power beyond that available by normally aspirated methods.
    The M62 and M90 are original equipment on many late model GM cars including Buick, Chevrolet, Oldsmobile and Pontiac with the “L67” code 3800 V6 pushrod engine, which are easily found in wrecking yards, and frequently on eBay.
    What can you expect from a supercharger? More power in every RPM range, power immediately without the need to rev the engine, far more power than can be produced without some external source (nitrous &c.).
    How much power? The limit is generally related to the head gasket seal and compression ratio, but 1.5 horsepower per cubic inch is easy, 2 horsepower is fairly common, and 3 horsepower is possible. Yes, it can be done by the traditional methods (carburetion, cam, compression), but a supercharged engine lasts longer at the same power level, requires less expensive speed equipment, and is generally easier and less critical to design and build. Superchargers have been successfully used on automobile engines for 100 years, it's not a new idea.     But, why not just use a turbocharger? Click here for some reasons why a supercharger may be a better choice for your project:

    Do you have a 1989-2009 BMW Mini Cooper, Buick, Ford, Holden, Jaguar, Mercedes, Mercury, Nissan, Oldsmobile, or Pontiac V-6 or I-4 with the Eaton factory supercharger, but want even more power?

    Before making any decisions about modifying or replacing your Eaton supercharger, get the best help available, and do it right the first time. This book is not a repair manual. Use it with your service manual for best results. Not an expert mechanic? You’ll still find many improvements you can make yourself with common hand tools.
    Speed & custom shop owners, tuners, engine builders and mechanics: many of the modifications described in detail in this booklet will be completely new and attractive to your performance-minded customers, and add many billing hours to your service department.
    In addition to proven modifications, I also include many ideas, potential adaptation of concepts known to produce results in other engines, &c. that in my opinion may provide the innovator and craftsman with new methods of gaining a competitive advantage (although these carry the usual risks of cost vs. benefit, development time, &c.). If you’re serious about performance from your Eaton-supercharged engine you don't just want this booklet - you need it.
    Don’t rely on a shop, even one with a proven history, to prepare your supercharger to out-perform the owner’s personal car or those of their premiere (famous) customers. Do they just use the same techniques and parts that everyone else uses? Why? With this information you can become part of the design team, rather than just the sponsoring driver.
    The Eaton M45, M62, or M90 can be greatly improved without extra parts or high expense.

    Topics covered in depth include: Flow bench tests; why don’t they provide useful results?
Supercharger vs. engine size; compares capacity vs. drive ratio for efficiency, how to predict
    when speeding up your existing model isn’t enough.
Supercharger drive ratio calculations; pulley diameter vs. engine RPM.
Exhaust port size vs. shape; which is more important, and why.
Reducing supercharger case temperature for higher charge density, more power and longer life.
Adapting another Eaton model for higher capacity, alternate intake position, intercooler use.
Countershaft use for reversing intake position, alternate drive ratios.
Estimating boost from drive ratio.
Compression ratio vs. boost; with calculations and tables.
Octane improvement; which alternate fuels are useful, cost-effective, dangerous and why.
Cam design for high boost; which cam events are affected, and why.
Clockwise rotation? counterclockwise rotation? What difference does it make? What to do about it?
Porting, the “black art” of modifying the supercharger for higher boost, lower charge temperature,
    reduced pumping loss, and longer life; more detailed information than currently available     I guarantee that you’ll find well-tested and effective information in this booklet that you’ve never seen before, and that will help you plan and complete your project. I identify parts and procedures that, in my opinion, have little or no value, or are not cost-effective - avoid these and save yourself time and money.
    Consider this: if this booklet 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.     Please note: this is not a “coffee table book”, it is a research tool for those who seriously want to improve their Eaton supercharger. It does not include information on your engine, or automobile. It is not a repair manual. I assume that you either are, or have a good working relationship with, an experienced mechanic. If your car won’t start, your float bowl leaks, the spark plugs foul, &c. my booklet will not help you. It does not contain information on tune-ups, or explain how to adjust, disassemble or rebuild the engine. If you do not already have this information do not buy this booklet. If you’re pleased with how your engine runs now, this booklet is not going to be of much use, although you might find it interesting.
    This booklet is only directly relevant to the Eaton Generation I· through V· superchargers, both OEM and as sold through Magnuson &c. The newest TVS &c. are not covered, although the information and comments are generally applicable.
    This booklet does not address other positive displacement twin rotor Roots variants such as those manufactured by B&M, BDS, Camden, Chinn, Dyer, Fageol, GMC, Hampton, Holley, Italmeccanica, Littlefield, M.A.G., Marshall, Moss, Nordec, Ogura, Pepco, S.Co.T., Wade, Weiand, or Volumex.     The proposed price of this booklet is $14.95 + postage. The draft version is roughly 40,000 words as of May 2009 and may be substantially larger when completed. It is not available yet. Do not order, all payments will be refunded. Click here to receive notification when this booklet is available: .