The pressures are much lower in a petrol injector system, so I suspect the tolerances may be less demanding.
A diesel is injecting against the cylinder pressure at or near tdc, a petrol injector is injecting at near atmospheric pressure well before the compression stroke completes. The compression ratio of a diesel is also higher than a petrol engine.
The lubrication requirements of high pressure pumps is more demanding than of lower pressure pumps.
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I did this a few years ago, I'd driven a diesel for a while but it was in the garage and I'd borrowed a petrol for a couple of weeks, got used to putting petrol in. Got the diesel back, practically empty and autopilotted about £10-£15 worth of petrol before I realised what I'd done
I just brimmed it with diesel and kept it topped up for a few days. Engine was fine. German, of course.
but because diesel is more viscous it can clog petrol injectors and you get loss of peak power and laggy response - we got that when a garage put diesel contaminated petrol in our car a while back. It never was the same again, even after all the cleaning solvents they threw into it. Petrol in a diesel is more dangerous due to the compression causing auto-ignition explosions contrary to the timing strokes and cylinder positions - so actual mechanical damage to multiple components is possible if you keep it running.
Absolutely, and there is risk of catalyst poisoning. From what the guy who came out to me said, a Diesel engine will just die when the petrol gets to the engine (having created havoc to the fuel components on the way)
Diesel in a petrol engine may run, but it won’t be doing a modern petrol engine any favours at all. You might get away with it in a carburettor B series engine or an old Ford Kent engine, but that’s about it.
As an aside, some old farm engines used to run on something called tractor vaporising oil - something akin to paraffin. They used to start on petrol, then once started and warmed up, they would be switched to TVO. But that was in the days when a cat was something to control the rat and mouse population (and keep the farm dogs in order )
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Quite so - neither petrol nor diesel ignite under pressure. Diesel burns when it is injected into the cylinder because the air in there has been compressed and is hot. Petrol won't readily ignite under those conditions, which is why it needs a spark plug to get it burning.
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Oh petrol will burn very happily in those conditions, which is why petrol engines work at lower compression ratios than diesel engines so that they don't "diesel" and the spark plug can control the combustion.
There is a video on youtube of someone driving an old diesel car filled with petrol. Apparently it drove quite well. That wouldn't have had the modern common rail diesel pump though, those do seem to be the weak link if not the injectors which won't be designed for a fuel that runny.
Liquids don't compress as much as gases, so would there even be enough heat for autoignition with an oxidiser when you're compressing liquid fuel?
A beemer M47 diesel (from 20 years ago or so) has an injection pressure of 250-1350 bar[1], so it wouldn't surprise me for a modern diesel to hit double that peak pressure.
Faster you can get the fuel in, the less the piston moves during the burny bit - and the less the piston moves during the burny bit, the less wasted energy goes down the exhaust.
[1]: Rover 75 & MG ZT owners workshop manual, haynes (2010) (not sure why they quoted a range)
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