Does Size Matter? Engine Displacement….How Low Can They Go?

K.Aoi said:
It's not actually that bad, direct injection goes a long way to helping solve pre-ignition issues on turbo engines because of the cooling effect of the misting of the fuel. High performance engines will pull timing a lot, but those usually recommend premium to start with. My Taos has a 1.5T and when I watch the timing it doesn't really retard much if at all even when hot and towing on an uphill, using regular gas.
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Maybe it's not advancing as much as it could either?
 
barryh said:
The whole history of car manufacture has been one of ever increasing specific power outputs. At each step of the way I imagine every generation has had the same thoughts about too much power from a small engine and yet the 6.8 HP per litre for the model T has increased to a record of 354 HP/litre for the Mercedes AMG one. Provided the engine is designed properly I see no problem at all with the current trend of small forced induction engines because they combine excellent low/mid range torque with outstanding fuel economy. The only thing I don't like is the complexity but that will only be a valid criticism if it goes wrong.
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source: https://fcr-ccc.nrcan-rncan.gc.ca/en

I find it interesting that there isn't much mileage difference between the turbo AWD CRV and the N/A Subaru's? The Subaru's seem to accomplish the same thing without a turbo? My 2018 Outback with MPFI isn't quite as efficient overall but is rated at 7.3l/100km hwy(better aero I guess?), which is mostly what we do.
 
Pew said:
We already do, the Ford focus had a 3 cylinder, 1L turbo mated to a 6-speed manual or 6-speed traditional automatic. Sold in the USA from '15 to I think '17 or '19..
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IndyIan said:
Maybe not directly caused by it's small displacement, but that engine wasn't very good. Turbo was probably pretty busy and had some issues, and it couldn't keep the coolant in the right places, and also the wet oil pump belt shredded and clogged the oil pump. Ford only recalled them for the oil pump belt.
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Tiny engine with a big turbo and a wet belt design. What could go wrong? Only everything...

 
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