Power für den Mercedes-Benz Motor

Increased power for the 190SL engine

For all those who would like some more horsepower in their 190SL, our in-house developed engine is the answer. The car looks no different from the outside; the extra muscle lurks under the bonnet.

It’s a sad fact that has been proven many times on the test bench: the standard 121 921 engine in the 190 SL does not meet its factory specification of 105 hp / 77kW. Its real power is generally between 86 and 89PS.

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Blog Kontaktloser Zündverteiler

Contactless distributor

The Mercedes-Benz 190SL W121 used seven different types of distributor. None of them is available anymore. A distributor with the part number 002 158 02 01 is available under the Bosch product number 0 231 170 138. However, this is fitted with a vacuum box and has to be converted, as it doesn’t have the same range of adjustment as the original distributors. The difference is around four degrees. Using a stroboscopic lamp, the ignition point is adjusted to 38° at 3500 rpm and must not change to more than 41° at maximum speed. If you set the replacement distributor to 41° at maximum speed, you will get 18° before OT at 800 rpm. This is too much. Maximum ignition timing at 800 rpm is 15° before TDC. This means you have to retard the ignition timing. To make matters worse, the points on the contact breaker that adjusts the ignition timing are subject to constant wear. Retrofitting a transistor ignition system can help with this As we only have one centrifugal adjustment on this distributor, it is not advisable to experiment with different ignition systems on old distributors that already have weak mechanical advance springs and worn shafts. The result will simply be unsatisfactory.

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190SL running rough and juddering

It’s a never-ending story.

Carburettor system, constant air leaks, rough-running engine, idling speed too high, juddering when accelerating, engine cutting out when under load and dying when braking.

These are all typical signs of an erratic fuel/air mixture. If the wrong air is drawn in – no matter where it’s from – the fuel-air mixture in the combustion chamber becomes too lean and causes this problem.
A common fix is to reattach the carburettor but this doesn’t always get the engine running smoothly. If the carburettors have been fitted to the vehicle for a long time, air intake leaks can be caused, for example, by a worn butterfly valve. You can carry out the following preliminary test:

  • Allow the engine to idle at operating temperature.
  • Spray all joints with a can of brake cleaner.
  • If the engine changes when the spray jet is directed at a particular location, you have located the leak.
  • Don’t forget to spray between the cylinder head and the intake manifold. The bypass hose between the two intake manifolds may also be leaking.

Any owner can check the operation of their carburettor for themselves by following these guidelines.

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Mercedes-Benz 190SL Verstärkter Anlasser

Uprated starter motor

The starter motor works really hard in your Mercedes-Benz 190SL.

It certainly has its hands full, especially when the car has been standing for a long periods or when the engine is very hot.

It’s probably also getting on in years and is hardly the youngest kid on the block. Its windings are unlikely to be in great condition, and if its brushes are also worn out, it won’t turn the engine as quickly as it used to.

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Intervallschaltung für Mercedes-Benz Scheibenwischer

Interval switch for windscreen wipers

Mercedes-Benz 190SL drivers are doubtless familiar with the shortcomings of the windscreen wipers when driving in light rain: you’re continually having to use one hand to operate the switch. It’s hard to drive like that for any distance. Alternatively, you can ask your passenger to pull the switch.

What you don’t want, however, is another switch on the dashboard. Not only doesn’t it look great, but it’s not authentic.

There is a solution, and that is to fit a relay, activated by the windscreen washer foot pump that you’ll find in nearly every W121 in the top left of the footwell next to the dipswitch.

Step on the pump briefly with your left foot to activate the interval switch. The wiper then operates twice and then once every 5 seconds after that. Step on it again to deactivate the switch. The interval switch is also deactivated when the ignition is switched off. Fitting isn’t particularly difficult. We offer the relay prewired to the wiring harness together with the fitting instructions. We would also be happy to install this interval circuit for the windscreen wipers in your Mercedes-Benz 190SL.

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