Engine tweak coming for Holden Supercars teams

A number of Holden teams, including series leader Triple Eight Race Engineering, will have an updated engine package at their disposal at some point during the 2021 Supercars season.

Engine tweak coming for Holden Supercars teams

Motorsport.com has learned that a change to the homologation of the KRE Race Engines-built V8s, an increase in the rocker ratio from 1.60 to 1.65, has been approved by the Supercars Commission.

KRE is closely aligned with Triple Eight and provides engines for the Red Bull-backed team and its customer squads such as Team 18.

Brad Jones Racing also runs KRE power across its four entries.

According to a Supercars spokesperson the change will bring the KRE motors in line with the Ford units used in the Mustangs and that there is no change to the maximum power limit.

"The 1.65 rocker that was made available to the Ford engine builders has also been made available to the GM engine builders," read a statement provided to Motorsport.com.

"All engines must still comply with the maximum aggregate engine power, irrespective of which rocker is applied."

When the updated KRE engine package will make its debut is currently unclear. Triple Eight confirmed that the change will only be made when the required parts are available for all KRE engines in the field. 

Walkinshaw Racing is the other GM engine supplier in the field, powering the Walkinshaw Andretti United and Erebus Motorsport Commodores.

Based on that statement, WR would also be eligible to apply for the same change should it be possible without breaking the AEP.

Engine rules have been in the news recently after Jordan Boys was stripped of his maiden Super2 race win.

The WR-built motor in his Image Racing Holden failed post-race checks due to cylinder heads that didn't match the Engine Specification Document.

WR countered that it had Supercars' blessing to fit the heads as a short-term solution to a lack of stock.

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