SUNBEAM S7 and S8 MOTORCYCLES
  • SUNBEAM MOTORCYCLES. HEADER PAGE.
  • SUNBEAM NEWS and START PAGE
  • About the bike.
  • Distributor Internals
  • Redundant spark ignition.
  • Coil Information.
  • Beam-Spark Ignition Unit
  • FOR SALE
  • Smiths Chronometric Speedometer
  • Calibrating Smiths Chronometric Speedometer.
  • Speedometer Drives.
  • Companies and Products.
  • My other bikes.
  • The Horn. and Rear Brake Spring.
  • HOW TO PAGE
  • Modifications Page One
  • Modifications Page Two
  • Modifications Page Three
  • Dipsticks,sumps and oil weirs.
  • The Electrics
  • Sunbeam Dynamo in depth.
  • Repairs and Maintenance.
  • Carburettors
  • S8 Front forks.
  • Full width front brake on the S8.
  • Top dead centre.
  • Your Sunbeam.
  • All things wheels.
  • Data Sheets.
  • Engine breathing and oil leaks.
  • Putting the engine together.
  • Stainless Steel Exhaust
  • Tools
  • All things final drive
  • I80 Degree Crankshaft
  • Completed engine speed ignition sytem.


Ignition Coils.

The coils shown in the pictures  below are all modern voltage driven types. The single output coil has a large metal clamp so it can be bolted to the the metal framework of the vehicle. The twin output coils have two studs which can be bolted to the framework of the motorbike. This can be seen in the pictures featured in page ' Redundant spark ignition'. The twin output coil is mounted underneath the seat and is fixed by the studs to the metal of the battery box.


Picture
A modern six volt single ended ignition coil. ( Shown above )

Picture
A modern six volt twin output coil.

Below is shown the twin output coil with direct connections to spark-plugs, so the distributor cap and rotor arm can be dispensed with not only simplifying the system but making it more efficient.
Picture
Picture
Ignition circuit with single ended coil and distributor.

Picture
Ignition circuit showing twin output coil
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