Service silent hectic alternator

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Service silent hectic alternator
Streblow

Service silent hectic alternator

Service silent hectic alternator

Service silent hectic alternator

Service silent hectic alternator

8th pictures

Service silent hectic alternator
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The assembly of the silent hectic on the BMW R 80 GS Basic.

Service silent hectic alternator
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On the left you serial parts, on the right the SH 5. The SH 5 does not have the diode plate on the generator regulator.

Service silent hectic alternator
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The Bosch Lima with carbon brushes.

Service silent hectic alternator
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The SH 5 generator from Silent Hastik, here still without the black runner.

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The runner of the silent hectic now rotates outside.

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Check the new alternator.

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Three-phase current controller from Silent Hastik for precise control of the alternator.

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The BMW R 80 GS Basic without alternator and engine.

counselor

workshop

Service silent hectic alternator

Service: SH 5 Silent hectic alternator
Modern power plant for oldies

Content of

The new SH 5 alternator from Silent Hastik for BMW two-valve boxers and Moto Guzzi from V35 to the last Le Mans promises more charging current without thermal problems. MOTORRAD Classic tried the innovation.

Nicolas Streblow

04/17/2013

When Bosch developed the alternators in the 1970s, which sit on the crankshaft of BMW two-valve boxers and Moto Guzzi V engines, there was no compulsory lighting or electronic transistor ignition systems. The charge balance was correct, at most frequent short-distance traffic in the city no longer adequately filled the battery. With the lights on, electronic ignition and additional heated grips, this type of alternator no longer delivers enough power in the lower third of the speed. In addition, the efficiency drops due to the high temperatures in the constant stop and go in the city.

But the old generators don’t like high continuous speeds either. The double-bearing crankshaft can bend so far that the coals start to bounce on the rotor, which is not exactly beneficial for durability. In addition, the generator behind the engine cover runs hot. Heat and vibrations also cause the rotor’s winding to break, as can be seen from a flickering charge indicator light.

The result: not enough juice for the battery

The battery is draining rapidly because it is no longer being charged. In addition, heat and vibrations often put an end to the diode plate in BMW models, which, together with the regulator, manages the charging current of the alternator. It too sits nice and warm behind the engine cover above the alternator. The standard alternator survives best at speeds between slightly below 3000 and almost 6000 tours. It works optimally there, wear and temperature are kept within limits.

Many boxer drivers and guzzisti probably remind these lines of their own mishaps from the last four decades. Other controllers (“Authority regulator”) and – at least on paper – more powerful alternators rarely brought improvement. If so, it was usually short-lived. Because the thermal problem as well as the limited durability at high continuous speeds can only be overcome with a new design.

Solution: a new design

However, with increasing output of the alternator, more and more heat is generated, so that only half a year of development time went into the cooling.

The solution: A rotor that now also functions as a fan, it lowers the temperature from around 180 to 100 degrees, measured in the stator. The magnets do not lose any magnetic force up to 250 degrees, so there are sufficient thermal reserves. Power curves and voltmeters provide information about the performance of the SH 5. A prepared motorcycle was deliberately not used for the measurement, but a private BMW R 80 GS Basic with an otherwise standard ignition system. Shortly after starting, the on-board voltage with the battery not fully charged is around 13 volts, and at a slightly higher idle speed it is already 14 volts.

After driving ten kilometers, the battery is charged enough that the Silent hectic alternator delivers 14 volts while idling with the lights on. While the so-called zero ampere speed – the alternator provides enough power for the ignition and lights, but does not yet charge the battery – is between 2700 and 3200 rpm for the Bosch generator, this value fluctuates around 1300 rpm for the SH Type 5 . This means that there is always enough power available from idle. The construction was able to prove its durability in racing as well as in airplanes.

You can’t see anything of the renovation

The pilot series model was installed by Ralf Huschke from Huschke and Wirth in Bochum. As a development partner of Silent Hastik, Ralf ensures that Toni’s constructions can be assembled with reasonable effort. We thank you for your patience during the photo production. The new generator replaces the old one, the diode plate is thrown out, as is the regulator.

In its place, the supplied Lima controller is installed, which is both regulator and rectifier – a necessity due to the changed generator technology with permanent magnets. You can’t see anything of the renovation. Only when the engine is running is it noticeable that something has changed: the charge control lamp goes out immediately after the engine is started, and that already at the lowest idle speed!

facts and figures


Service silent hectic alternator


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On the left the series parts, on the right the SH 5. The diode plate is no longer necessary, the rotor (center) now rotates on the outside.

The Silent hectic alternator SH type 5 is available for the following models:

BMW two-valve boxer:

  • all models from / 5 to / 6 to 7/1976, stator centering 105 mm (crankshaft with cone) 
  • all models from / 6 from 8/1976 to the R 80 GS Basic, stator centering 107mm (crankshaft with cone)

Moto Guzzi:

  • all models and years of construction from the V 35 to the last Le Mans 1000, stator centering 105 mm (crankshaft with cone)
  • all models and years of construction with 1100 cm³ engines, stator centering 105 mm (cylindrical crankshaft)

Price:

  • Alternator SH 5 complete with regulator 497 euros, installation around 120 euros

For comparison, the current prices for BMW original parts:

  • Alternator complete 644.58 euros
  • Single stator, only ring winding, plus installation: 135 euros
  • Rotor: 332 euros (in exchange with free dealers 119 euros)

Information at www.silent-hektik.de and www.hw-bochum.de

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