We use cookies for analytics, advertising and to improve our site. To find out more see our privacy policy.
>
Shop
>
Engine
>
S&S Engines

S&S Engines

S&S KN-Series Engines
S&S KN-Series Engines
Knucklehead - the name describes a true legend and this engine design is without a doubt one of the important milestones in the history of Harley-Davidson. Introduced in the year 1936 the ohv-engined models in short time became synonyms for sporting, fast and reliable touring machines. Economically this layout proved to be a huge success for the Motor Company, too, because brand followers - and many others - quickly realized the outstanding qualities of this motorcycle. Design and technology of the Knucklehead turned out to be supremely sound and it became the prototype of all Milwaukee Big Twins, which significantly influenced all successive model groups down to the present day. The KN-Series engines by S&S closely resemble the appearance of a stock Knucklehead engine. However, numerous reforms enhance power, engine life, and reliability. The main improvement in design is the 1958-65 style flywheel assembly, which uses a splined sprocket shaft and a Timken sprocket shaft bearing on the drive side. This increased flywheel stability and strenght became necessary to handle the significantly increased power development. The rocker arm cover “tins” are another modern improvement. They are made from die-cast aluminum, and instead of being held in place by the valve guide, they are held down by valve spring pressure. A special gasket on the bottom of the lower “tin” provides a positive seal, and is much easier to service if needed, since the valve guides do not have to be pressed.
The selection includes 93” (1560 cc) engines with crankcases for early style chassis thru 1947, with 1955-64 tin primary and 1936-64 transmissions.
S&S KN-Series engines come completely assembled and ready to run with a electronic S&S Super Stock ignition system and Super E carburetor.
more …
S&S SH93-Series Shovelhead Style Engines
S&S SH93-Series Shovelhead Style Engines
The legend lives! For die-hard Shovelhead enthusiasts we offer these complete, ready-to-install Long Block engines, assembled by S&S builders with the finest parts on the market today. Start with the bullet proof crankcases, flywheels, cylinders, and heads which proved their performance since so many years, and finish with the latest premium valve train components. Crankcases and cylinder heads come with natural aluminum finish, the cast iron cylinders are black powdercoated. Billet gear cover, tappet guides, and rocker boxes look outstanding and offer the kind of performance you expect from an industry leader like S&S.
What you can’t see inside the engine is just as impressive. The S&S Shovelhead style tappet guides are designed around the quiet, dependable Evolution style tappets. The corrected tappet guide bore geometry assures correct valve timing with carefully selected S&S Evolution style camshafts installed in the gearcase. The unique adjustable Quickee pushrods are collapsible for easy removal and installation, but are stronger than stock style pushrods. Inside the billet rocker covers are S&S’s exclusive forged roller rocker arms. Top end oiling is provided through the pushrods which makes external oil lines obsolete. To let them breathe deeply all S&S Shovelhead engines are supplied with a Super E carburetor because tests showed that it provides the best performance on the street.
Last but not least S&S SH engines are equipped with S&S Super Stock ignition systems. All these features result in Shovelhead engines with the kind of quiet power that some folks may just have a hard time believing.
more …

Complete S&S engines

Do you have a custom project in the basement or garage and are still missing the engine? Then you've come to the right place: we offer Knucklehead, Panhead, Shovel, Evo, with different displacements and completely assembled by S&S from new parts.

Another scenario. The recently acquired project gives problems. You opened up the engine and experience: the connecting rods wobble, all bearings have considerable play, the pistons are from Moskwitsch stocks and have different diameters, valves from who-knows-where leak and prevent proper compression. In short, everything is worn out. In this situation the complete engine from S&S is just what the doctor ordered!

The mounting points are the same as on original cases. If you choose a version with longer cylinders, you have to make sure that the rocker covers do not interfere with the 4-speed frame. Minor milling work must be taken into account at this point. Unspectacular, but it should be mentioned here.

Proven Performance

When asked about a manufacturer of high-performance engines, the majority of enthusiasts of American V-Twin engines mention the name S&S. The engines still power more custom bikes than all other brands put together and they have always been our first choice when it comes to upgrading standard bikes with extra power and performance. The sometimes rather tame standard Harleys are transformed into respectable muscle bikes in no time. S&S sums this up very aptly in their motto "Proven Performance".

Compared to today, the typical stroker engines of the 60s and 70s were rather crude units and earned a reputation for unreliability and short service. But that was a long time ago and S&S has made great progress in its company history, not only in terms of performance, but also in terms of reliability and mileage.

Twice the performance with the same service life as an original engine - is that possible?

Unfortunately, performance depends on some restrictions, which - depending on your country - have to be observed, on order to not attract too much attention from the "authorities". Longevity is also possible, the materials used make this possible. If you obey the rules when running in and prepare the engine for its years of service with good sense and only turin it on after the S&S engine has warmed up properly, you will ber ylikely experience a long service life. Answer to the question in one sentence: In our opinion, buying a factory-assembled S&S engine is the safest way to achieve this goal.

How do you know you have a genuine S&S engine?

All complete engines from S&S come with a certificate that confirms that it is "The Real Thing". If this certificate is missing, you should assume that the unit was not assembled by S&S in Viola WI, USA. The certificate belongs to the engine like the registration certificate belongs to the motorcycle. When reselling the Harley, the trustworthy seller will provide the certificate.

Are there performance data sheets for S&S engines?

The power output of the individual engine depends on parts such as the air filter and exhaust. A data sheet can only be created for a specific configuration. If you need performance data for registration, you therefore have to go to a test bench. If you need the engine capacity for tax purposes, check the certificate.

Have any questions?

Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com