Talk:Tatra 80

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Mis-described engine

The T80 liquid-cooled V12, like the quite different T77's air/oil-cooled V8, doesn't easily fall into any of the usual valve descriptions. The T80 is described by everyone (Tatra copycat reportage is routinely unreliable), including factory historian Karel Rosenkranz, as side-valve (which Americans would call L-head), but it isn't. Side-valve engines have their valve-stems parallel to the cylinders, with an inverted L-shaped combustion chamber but, like the T77's though arranged differently, the T80's is another high-cam OHV engine with no pushrods. The valve-stems are horizontal, not parallel to the cylinders, and the combustion chamber is a sort of asymmetrical hemi, not an L-head. The engine is not SV and plainly not sleeve-valve, and there isn't an established shorthand for it, but it shouldn't be misrepresented by using one of the familiar categories. The 1932 Auburn 12-160's 45deg Lycoming V12 had similar horizontal valve stems and wedge-shaped combustion chambers, but with a lower camshaft and vertical 'walking beam' rockers, albeit shorter than the Tatra T77's horizontal ones. Heckmotor97 (talk) 15:00, 17 August 2022 (UTC)[reply]

Number built, and dates?

The 'History' text concludes with: "Tatra built 22 Type 80 cars between 1931 and 1935", while the 'Overview' side panel has 25 produced. Factory archivist Karel Rosenkranz, in his enormous 'Tatra 100 Years - Passenger Cars' has 26 produced from 1932-38. Heckmotor97 (talk) 13:06, 18 August 2022 (UTC)[reply]