That's a good rundown, thank you.
The Honda Civic VX from 92-95 introduced a type of valve lifting that created a vortex with the air and fuel as it entered the combustion chamber. They explained that it was a clever way to achieve more efficient fuel atomization. I remember a mention of the droplet particle size; the smaller, the more complete fuel burnoff.
Quick question: what kind of diesel van would you say is the most efficient and reliable?
Regarding the diesel van, what country are you considering?
USA.
This is complex because of US emissions law. The big three use truck engines in their vans. This is not ideal because of the large displacement, unnecessary unless towing heavy trailers. The import options are technically ideal, but parts and service can be an issue. I would choose the Mercedes sprinter, parts are expensive but available, rarely needed. A 2006 or older Duramax from GMC can achieve 20 mpg and offer incredible durability. I’d avoid Cummins or the Ford Navistar engines unless you’re considering a 7.3 or a 12V Cummins.
That's a good run-down, thanks for the info!
