In message , "Mike Cawood, HND BIT" writes
Sorry but that's wrong. Older diesels were known as indirect injection, that is to say that the fuel was not injected directly into the combustion chamber but into a pre-chamber.
yes you are right :) but they still had one injector per cylinder, and the timing was done by the order and time of the injection of fuel into the cylinders.
In message , "aussie bongo (*_*)" writes
I wasn't disputing that part, only the bit about not being able to have indirect injection.
The original point was about oil change intervals being longer on modern DI engines compared with older iDI engines but that is in part due to the iDI engine suffering from oil dilution with unburnt fuel washing past the rings.
On my car there's no mention of early oil changes - where needed through adverse conditions - in the service book, but is in the handbook.
Mike Cawood, HND BIT ( snipped-for-privacy@nospaam.homecall.co.uk) gurgled happily, sounding much like they were saying :
Bollocks. True - the timing is provided by the injection. But direct injection and indirect injection are different ways of doing it - indirect isn't into the manifold, like on a petrol, with the valve doing the inlet timing, but into a pre-combustion chamber.
It was previously believed the nobody would accept direct injection diesel engines in cars for refinement reasons. Then along came the old VW golf. Turns out that we could tolerate the clatter after all...
Newer direct injection diesels have more sophisticated control which can help blunt the violence of compression ignition. Also power is usefully more independent of engine revs...
When did VW start using DI in cars? I think Rover and Fiat got there first, in the late 80s.
I've got a 2002 TDCI which has done 72k, 65k of which is down to me.
Front discs replaced at 40k. Front Shockers were goosed after 50k It likes eating tyres - but wears the backs as well as the fronts
Good performance, great handling, pretty practical to boot - best car I have owned.
It depends. Albion were using mechanical direct injection pre WW2. Makes the engine far too coarse for car use though but great for economy.
Think it is electronic injection that makes it practical today - you can pulse the feed rather than just squirting it in.
Some people maybe. It was one of the factors that made me get rid of my Discovery (also DI) - the clatter got to me. Not straightaway, but slowly and surely.
Not quite. Audi put the 1.9 TDI donk into the 80 before the Golf sniffed it.
Austin put the 2.0 direct injection donk into the Maestro and Montego before Audi as I recall too.
At least in the United Kingdom...
Indeed, both the Fiat multijet's and latest large capcity VAG V6's with piezo crystal injectors fire upto 19 separate pulses of fuel into each cylinder PER power stroke.
PSA and all the other Elecronically fuelled DI's use atleast some pre-injection too.
Tim..
You obviously drive quite hard- discs should last upto 50k (tho 40k isnt bad) but tyres should last 20-25k even on a fairly enthusastically driven Focus. I had no problem in getting that mileage on mine.
Rear tyre wear should not be an issue. Have the bushes and geometry checked.
Tim..
One small point in favour of the diesel is that a petrol engine uses fuel enrichment when cold so nicely washing the cylinder bores while diesel does not ( diesel is more a lubricant than petrol which is more like a solvent ), does this make sense ???.
Paul
yes paul. petrol cleans away oil and diesel is a oil.thus petrol cleans some of the oil from the cylinder walls, where diesel oils and helps to lubricate the cylinder walls.
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