Engine Family
McLaren M840T (V8)
V8 (90°, flat-plane)4.0L (3,994 cc)Twin-Turbo (Speedtail: + hybrid)2017–present612–1036 hp
Designed by McLaren (with Ricardo). Evolution of the M838 (stroke +3.6 mm, ~41% new parts); Ricardo-built. Variant codes: M840T→720S/765LT/750S/Sabre; M840TE→GT/GTS (smaller turbos); M840TR→Senna/Elva; hybridised M840T→Speedtail (1,036 hp combined). FLAG: kept as a separate page from the M838 by displacement (3.8 vs 4.0), per the one-displacement-per-family convention; the two share architecture/lineage.
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