Supercars confirms Holden engine changes
Supercars has confirmed that half of the Supercars grid will run with engine updates in place later in the 2021 season.
A change to the rocker ratio of the Holden engine built by KRE Race Engines has been approved by the Supercars Commission – with the ratio increasing from 1.60 to 1.65.
Triple Eight, Team 18, Brad Jones Racing, Team Sydney and Matt Stone Racing all run the KRE unit, with Walkinshaw Andretti United and Erebus using Walkinshaw Racing engines.
The change will bring the Holden unit inline with the engine in the Ford Mustang, although there will be no change to the maximum power unit.
“The 1.65 rocker that was made available to the Ford engine builders has also been made available to the GM engine builders,” a Supercars spokesperson said.
“All engines must still comply with the maximum aggregate engine power, irrespective of which rocker is applied.”
The change will only come in when the relevant parts are available for all teams to use.