What does FSI mean
Discussion
Just catching up on a few posts.
I understand diesels run hotter than petrols as a general rule.
Thermodynamic efficiency is governed by the temperature difference between the outside of the cylinder and the inside - diesels run hotter, and are thus more thermodynamically efficient.
High combustion temperatures tend to result in harmful NOX chemicals - the Government don't like these, so they ask manafacturers to fit EGR valves. There's no (or at least less) oxygen in the exhaust gas, so the combustion temperatures are lowered, and thus less oxides of nitrogen.
Lean combustion happens faster than 'non lean', the faster the combustion the hotter it is at peak temperature, and the more nasty the exhaust.
As far as direct injection engines blocking ports and valves - no experience of this, so not able to comment.
Thanks for the welcome, lovely website, great forum, and smashing people
I understand diesels run hotter than petrols as a general rule.
Thermodynamic efficiency is governed by the temperature difference between the outside of the cylinder and the inside - diesels run hotter, and are thus more thermodynamically efficient.
High combustion temperatures tend to result in harmful NOX chemicals - the Government don't like these, so they ask manafacturers to fit EGR valves. There's no (or at least less) oxygen in the exhaust gas, so the combustion temperatures are lowered, and thus less oxides of nitrogen.
Lean combustion happens faster than 'non lean', the faster the combustion the hotter it is at peak temperature, and the more nasty the exhaust.
As far as direct injection engines blocking ports and valves - no experience of this, so not able to comment.
Thanks for the welcome, lovely website, great forum, and smashing people
I think it possible to seperate out combustion temperature, which can only realistically be measured in a lab and running temperature.
The running temperature (ie temperature of the block / head / coolant etc) is influenced by the amount of material in the engine. Diesels tend to be bigger and heavier, and therefore warm up slower.
I was involved in a project at one stage in my life to understand why the old XR3i engine was slow to warm up - answer, too much water in the block.
The running temperature (ie temperature of the block / head / coolant etc) is influenced by the amount of material in the engine. Diesels tend to be bigger and heavier, and therefore warm up slower.
I was involved in a project at one stage in my life to understand why the old XR3i engine was slow to warm up - answer, too much water in the block.
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