Head types

[Hshan]

Umm…

As for Hemis: Hemis (I've seen the FAQ) - #5 by oppositelock

Reverse flow - there’s one very old thread that never got any response from the devs, but I guess one point from the FAQ fits here pretty well:

@MrChips

7. Hemis, sidevalve, and flathead engines

There are no plans to implement these head designs. The reasoning here is that they were technically surpassed by other existing designs at the time the game starts in 1946. Of course there were very good, even iconic, engines made using these designs, and this is not to diminish their achievements. Automation is technically reasonably accurate, and this would mean there would be no real incentive to use the older tech because it would give you an overall worse performing engine compared to the same effort being put into a different, also available head design.

Angled inlines: Suggestion: Inclined engines, etc
This is a very old thread, but the newer one didn’t get a dev response. Anyway, I guess the reasons for “no” haven’t changed - PITA in terms of art, little to no practical benefit in the game (how often couldn’t you fit an inline because of its height? I can’t recall having such problem personally).

Valve sizes/angles - basically watch some of the recent Little Dev Updates. They are coming, in a way of, yes, different head types. Regular/eco/performance. And you can roleplay performance 2-valve heads as hemis On that note, you can already sorta emulate reverse flows too - just give the top end some -3 quality

BTW, hemi is actually a combustion chamber shape, forcing the valve angle - do you want to choose from other shapes too, to decive whether you like +1%/-1% efficiency? Okay, maybe 3%. What I mean is that it would be a very minor effect.