Descendant only in the fact it came later. The engines share nothing from memory. The K series was an all new small capacity engine (1400cc) on release. Compared to the O, M and L (diesel) it's a fully aluminium block and head with steel damp liners. The K series had its bore and stroke upped to bring it to 1800cc after launch, along with adding variable valve control with the VCC engine.
The two engines share very little in common, the most frequent thing being they're normally both attached to a a PG1 gearbox.
Descendant only in the fact it came later. The engines share nothing from memory. The K series was an all new small capacity engine (1400cc) on release. Compared to the O, M and L (diesel) it's a fully aluminium block and head with steel damp liners. The K series had its bore and stroke upped to bring it to 1800cc after launch, along with adding variable valve control with the VCC engine.
The two engines share very little in common, the most frequent thing being they're normally both attached to a a PG1 gearbox.
Source: UK MG owner that used to own 300bhp ZR.