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S&S

S&S

In 1958 George Smith and his wife Marjorie started a small company called S&S Cycle. Located in Blue Island Illinois, the Smith´s new company began by selling lightweight aluminum pushrods for Harley-Davidson Motorcycles. George Smith´s vision was clear and simple: "I want to make all bikes go faster". This was a goal he pursued for the rest of his life.Even through George an Marge Smith have passed away, the company they founded still shares that vision and S&S Cycle has grown to be the worlds most respected manufacturer of high performance engines and components for American V-Twins.

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Products by S&S in our web shop:

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 74” (1200 cc) and 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.
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S&S P-Series Engines
S&S P-Series Engines
The Panhead engine, which was originally produced from 1948 until 1965, has been hailed as the coolest looking classic engine of all time and the new P-Series engines from S&S captures that retro styling from the 50’s and 60’s, but with 21st century engineering. These engines were built to run and are loaded with modern technology. The heads are a new design based on the S&S Shovelhead SH-Series engines, topped with roller rockers (1.500 ratio). Also incorporated is the S&S hydraulic valve train, increasing cam choices dramatically and improving oiling throughout the engine. All P-Series engines feature 1958-65 style flywheel assemblies, which use a splined sprocket shaft and a Timken sprocket shaft bearing on the drive side. This increases flywheel stability and handles the significantly increased power development.
P-series engines are available in two versions to fit 1948-’99 style chassis. The first is designed for 1955-‘64 style tin primary applications, but can also be installed in 1948-’54 chassis if a 1955-’64 style inner tin primary cover is used. The second version fits 1965-’69 style chassis using the early alloy primary. Match your performance needs with a choice of displacements: 74” (1200cc) and 93” (1530cc). All versions will fit in your stock frame. Included with every P-series engine are a Super E carburetor and a S&S Super Stock ignition with billet timer housing. Exhaust flanges are designed to accept Shovelhead type pipes.
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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.
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S&S Super Stock Shovelhead Cylinder Heads
S&S Super Stock Shovelhead Cylinder Heads
Primarily designed for stock replacement applications where traditional looks and improved performance are important. These cylinder heads are made from the same high-quality aircraft-cylinder head material like the Evolution heads. The intake port is the same diameter and is positioned in the same location as stock which means stock manifolds bolt right up. A directional vane like the one used in S&S Evo heads to route the air around the valve stem and guide area is located in the floor of the port. Standard intake valve diameter is stock at 1 15/16“. The combustion chamber is identical to stock enabling installation on any engine with hemispherical domed pistons. The exhaust port is also stock configuration and readily accepts stock style exhaust systems. Standard exhaust valve diameter is also stock at 1 3/4“. The pre-installed .590“ lift valve springs are used for greater cam lift versatility, the valve seats are compatible with present day unleaded fuel. Although these heads for Shovel big Twins are designed for stock replacement applications, flow characteristics have been improved up to 9% more flow. S&S Shovelhead cylinder heads easily bolt on and fit like stock. Frame and other clearancing problems are non-existent. Exhaust systems with stock dimensions can be used. Stock rocker cover assemblies are not included and are installed using hardware provided. They are available as stock replacement and as a 2-plug version for 3 5/8” Big Bore cylinders. Each High Output Super Stock Shovelhead cylinder head kit includes front and rear cylinder heads completely assembled with valve seats, valve guides, valves, valve springs, spring collars, valve keepers and valve guide seals ready to run. Also included are gaskets required for installation including cylinder base and head gaskets, rocker cover and exhaust port gaskets, rocker cover and exhaust pipe mounting hardware and installation instructions.
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S&S Oil Pump Twin Cam
S&S Oil Pump Twin Cam
As soon as they became available, the S&S gear drive cams were hailed as the solution to high performance valve train problems in Twin Cam 88 engines, so the S&S TC oil pump incorporates a modified version of the S&S gear drive cams, and actually uses the cam drive gears to pump and scavenge oil to and from the engine.
The S&S oil pump provides for the lubrication requirements of big inch high-performance engines, but of course it also works great for stock displacement street engines. It comes as a kit and replaces the stock oil pump, cam support plate, bearing retainer plate, bearings and gear cover. It is compatible with S&S or stock Twin Cam crankcases. The polished billet gear cover is not just decorative but supports the outer ends of the cams. Cams are not included and must be purchased separately based on the application.

Oil Pressure

The stock Twin Cam 88 engine‘s oil pressure sending unit measures pressure before the oil filter, so the actual oil pressure going to the engine can vary tremendously depending on oil filter restriction. However, the S&S oil pump regulates pressure after the oil filter which results in more consistent oil pressure through a wide range of engine temperatures. There is no advantage to increasing the hot running oil pressure. More pressure will only increase the likelihood of oil leaks and will increase the volume of oil that needs to be scavenged from the crankcase. A larger volume of oil in the crankcase robs power due to increased drag on the flywheels, but more importantly it increases the amount of heat generated as the flywheels plow through the extra oil. The lost power is converted to heat. The S&S pump has been shown to reduce oil temperature by approx. 10° C. Less oil in the crankcase also has an added benefit of reducing oil carryover (oil blowing out of your crankcase breather). To further reduce oil carry over, it is recommended that the engine builder install the S&S Breather Valve for Twin Cam A style engines when the S&S oil pump is installed. Engines built with S&S crankcases only require the special wave spring, since a breather valve is included with all S&S crankcases.
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