From April:
https://the-race.com/formula-1/red-bull ... f1-engine/
“The first single cylinder engine will be imminently running for the 2026 rules. We move into the new facility at the end of May. We’ve attracted some fantastic talent into the group.
“So, we’re pleased with progress.”
Single-cylinder engines are usually early prototypes before the real thing is pursued at full scale.
Horner was not more specific than saying it will run “imminently” but it is understood that dyno running is not meant to take place before July 1, which could be the timeline Red Bull is working towards.
They moved into the facility in May. Reported that a single cylinder would be running no earlier than July 1st, and now they have a V6
2 months later? Impressive if so. However I'm not sure that's the case or atleast if it IS the case, then that V6 engine is likely a very very very pre-production prototype which will be nothing like the engine we see 3 years now.
I think it's far more likely that the "running" engine was the single cylinder concept engine. Words are used ambiguously by Horner and the journos.
A lion must kill its prey.