One thing I have noticed about Japanese (heavy) commercial vehicles is that they do seem to favour large n/a engines. Maybe not now, but not in the dim and distant past (before turbo's became the norm) either. And this applies to buses (coaches specifically) as well as trucks.
For some context or comparison, when I started with Stagecoach in 2003, the coach fleet were all Plaxton bodied Volvo B10's, so called because the engine was "about 10 litres". They were actually 9.6, but Volvo must have decided that was close enough!. A couple of years later the B10 coaches were replaced by B7 coaches which, according to Wikipedia, could have a 6.7, 7.1 or 7.3 litre engine.
A couple of years ago I was spending quite a lot of time on a couple of websites with cars/vehicles for sale in Japan, one of which also had commercial vehicles of all sizes as well as cars. With this thread in mind I went back on it to have see if I could find some big engines. Pretty much straight way I found a 2003 Nissan coach with a 21.3 litre engine, also found a Mitsubishi Fuso coach with a 20 litre engine, but very common for coaches of around that age to have engines of 15 litres or more.
But when I was looking at that website before, I came upon a really beefy looking 6x4 Nissan Big Thumb(!) tractor unit. This had had a 26.5 litre n/a V10, which you could be forgiven for thinking plenty big enough. But one of its rivals at the time was the Isuzu Giga which could be had with a 30,390cc engine(!), also V10, and approx 600PS.
Going down a little in size, I also came upon a weird Frankentstein's monster of a van from Toyota. This grafted the cab of the Dyna truck on to the fairly compact Hiace van body, but it could be had with a 4.0 straight six diesel. Assuming that was more or less the same engine as the J60 Landcruiser used, in n/a form this would have made circa 100PS, so a very low stressed engine!.
I have no doubt the reliability of these big n/a engines was absolutely top notch. So I suspect the reason they didn't have much impact in UK/European markets is that there was some kind of restrictions inlace to stop the Japanese heavy commercials doing the same as the cars did!.
Exchange rates may have also been a factor though?
Edited by badbusdriver on 07/10/2023 at 09:47
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