Hi,
I’m playing current open beta branch of automation (Build: 200203.11823.1719.Manual). Found a bug while playing campaign, but all of the following metrics I have produced in sandbox.
You might want to check out Boxer 4, Dircet Acting OHC, (full cast iron) Eco Single Carburettor settings. I can only make them not knock with Regular leaded fuel in 1955 with quite extreme settings:
- Minimal engine size: 50x50 mm
- Compression 6.0:1, Cam 100
- Standard intake, Fuel Mixture 13.2, Ignition timing 0, RPM limit 7500
- Exhaust Cast Log, 12.7mm diameter, Second mufffler Reverse Flow
- All quality sliders at default 0
They can’t really be this bad, right?
Why I believe this is a bug:
- No other engine acts this way
- Octane ratings for other Boxer-4 carburettor configurations, with all other settings the same:
Single barrel,single carburettor: 74.8 RON
Single barrel, twin carburettor74.0 RON
!!!Single barrel eco, single carburettor 92.0 RON !!!
Single barrel eco, twin carburettor 74 RON
2 barrel, single carburettor 74,8 RON
2 barrel, twin carburettor 72.9 RON
DCOE, Singe carburettor 73.7 RON
DCOE, Twin Carburettor 72.2 RON
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In comparison, Boxer 6, Direct acting OHC, all other settings the same
SIngle barrel eco, sing carburettor 75.2 RON
Single barrel eco, twin carburettor 72.9 RON -
I checked all the other engine block types available in 1955, all of their single barrel eco, single carbs are ~75 RON. Boxer 4 stands out alone.
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I checked all the engine block types in 2020: boxer-4 89.7 RON, all the others 73.5 ±1 RON.
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I checked other valve systems for Boxer 4: all of their single eco carbs have abnormally high RON:s. PR and DAOHC 92 RON, OHC and DOHC 90.5 RON.
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Therefore there’s some bug in single barrel eco, single carburettors setting files, that affects ONLY boxer-4 engines. Misstype in a datasheet, I presume.
Maybe this bug has slipped by, because who the heck uses boxer 4 engines anyways. 
thanks for pointing out!