Engine Optimisation

In the early 1960’s my mother ran a very nice Mercedes 230SL, one of the very first in the area and it may have been the foundation of my interest in cars.

Mercedes 230SL
Gorgeous!

It had a 2.3 litre straight 6 cylinder engine with Bosch mechanical fuel injection, one of the very early production cars to have injection rather than carburettors. The W113 model range was also one of the first to have separate heating controls for passenger and driver. Radial tyres and crumple zones front and rear made for an advanced vehicle for the 60’s

The car was very well engineered and was a joy to drive but every couple of months (according to Mother) it would start to misbehave slightly, reluctant to start, the occasional misfire and not revving smoothly. Of course the local Mercedes garage was always quick to respond, sending a mechanic to sort out the issue and leaving a large bill in return.

After several of these episodes (and bills too) the mechanic confided to mother that the problem was the fuel injection system ‘gumming’ up. This was because the car was only used for short trips. His preferred solution was to drive to the nearby A1 and thrash the car in 2nd gear for about 10 miles, a callout job he enjoyed!

DPF’s – A modern problem.

These days a different problem afflicts modern engines, particularly diesels, the DPF – Diesel Particulate Filter.

DPF - Diesel Particulate Filter
DPF

A DPF is a filter that captures and stores exhaust soot (some refer to them as soot traps) in order to reduce emissions from diesel cars.

But because they only have a finite capacity, this trapped soot periodically has to be emptied or ‘burned off’ to regenerate the DPF.

This regeneration process cleanly burns off the excess soot deposited in the filter, reducing the harmful exhaust emission and helps to prevent the tell-tale black smoke you used to see from diesel vehicles, particularly when accelerating.

I have recently been a passenger in a small diesel van that was used for very short journeys and it seemed to have a permanent warning light.

“DPF Full – Please take an extended drive”

Plus ca change, plus c’est la meme chose….

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