Just had an item on my iPhone news channel. Diesels will offer the most stringent of tests - the slightest sign of smoke will result in a fail.
Yet cars over 40 years old will be exempt from MoT. Do the government think these will all be maintained in a condition that keeps them 'smoke-free'? Even from new, is there such a thing as a genuinely smoke-free exhaust? And what do they mean by "smoke"?
Blue smoke? Grey smoke? Even from new, the manufacturers do not guarantee absolutely no burning of engine oil .
In a cylinder, the downward power stroke will burn off the minute film of oil left as the piston descends, and which will be expelled through the exhaust as the piston then makes its upward stroke. And this applies to all internal combustion engines, regardless of which fuel is used.
When accelerating heavily, I have seen diesel cars emit a brownish grey smoke as they have passed me. So, with the high speed revving that is a required part of a diesel emission test, I would imagine a similar output of visible fumes. Sounds to me that a lot of diesel owners are going to be hammered on a government whim - or could it be a sinister plan to find a way of ejecting perfectly good vehicles from our roads?
Yet cars over 40 years old will be exempt from MoT. Do the government think these will all be maintained in a condition that keeps them 'smoke-free'? Even from new, is there such a thing as a genuinely smoke-free exhaust? And what do they mean by "smoke"?
Blue smoke? Grey smoke? Even from new, the manufacturers do not guarantee absolutely no burning of engine oil .
In a cylinder, the downward power stroke will burn off the minute film of oil left as the piston descends, and which will be expelled through the exhaust as the piston then makes its upward stroke. And this applies to all internal combustion engines, regardless of which fuel is used.
When accelerating heavily, I have seen diesel cars emit a brownish grey smoke as they have passed me. So, with the high speed revving that is a required part of a diesel emission test, I would imagine a similar output of visible fumes. Sounds to me that a lot of diesel owners are going to be hammered on a government whim - or could it be a sinister plan to find a way of ejecting perfectly good vehicles from our roads?
