It’s worth noting that the engine illustrated is a gasoline direct injection engine, which are fairly common on new cars but historically not so.Until the early 2000s most fuel injected gasoline engines were multi-point injection – the fuel was injected in to the incoming air stream immediately before the cylinder, and before that indirect injection which injected where the carburettor was.Then there are carburettor engines.Most diesel engines have been direct injection for many decades now, due to the behaviour of the fuel.

I just took a close look at it, and I think you’re right. It’s not the easiest thing to see due to the wireframe, but with a second look it does appear that the injectors are just behind the valve.So yes, it’s multi-point injection, rather than direct injection which is the new hotness for gasoline. Formula 1 will allow it from next year with the new V6 formula!
I’m currently rebuilding a 2.0 TDCI engine .. an interesting feature is the crowns of the pistons. With direct injection the fuel is aimed at specifically shaped depressions in the piston crowns which causes vertices between the automised fuel and air improving the mix for a cleaner burn.V6 turbo with energy recovery on the turbo itself. They’re also allowed to use that energy to re-spool the turbo to eliminate lag. They’ve also hugely bumped the KEERS and built it in to the throttle map – no more button for it.

I can’t remember the exact figures, but it means that they have so much torque when they go full throttle it’ll spin the wheels at almost any speed.I’m looking forward to them slipping around the corners again. Also to engines blowing up, since that doesn’t happen much due to 5 year old engine designs.

This totally amazed me when I started working on cars. Both carburetors and direct injection creates a mixture of gasoline and air BEFORE this mixture enters the cylinder. Direct injection now seems like a misnomer 😉 It makes a lot of sense if you think about the incredibly violent conditions inside the cylinder head though. I’m always surprised that spark plugs survive as easily as they do, I imagine a high accuracy injector nozzle in that situation would not last as long as current injectors. Has anyone done a true direct-injection design,Jacob, can you update the drawing slightly? “The fuel injectors spray gas into the cylinder…” is incorrect, it should be closer to “The fuel injectors spray gas into the intake mainfold where it mixes with air before being sucked into the cylinder”

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