Blackmore teamed with fellow businessman and enthusiast Earl Evans to jointly purchase a 30 percent stake in the team midway through 2024.
They bought out Jess Dane to join Jamie Whincup (30 percent) and Tony Quinn (40 percent) as co-owners.
Blackmore confirmed to Speedcafe he has resigned as a director for now but will retain his ownership stake.
“I’ve got some significant business opportunities that I need to focus on that will tie me up for several months,” he said.
“That’s where my attention needs to be and it wouldn’t be fair to Triple Eight or myself to be stretched too thin.
“I’ll remain a shareholder and look to return to a directorship once that has been taken care of.”
Blackmore’s main business interest is ownership of the highly successful South Cross Truck Rentals.
The change means Blackmore will no longer have a direct vote on Triple Eight business matters.
Blackmore said there was no internal pressure to step back as a director, with the move his own decision.
Whincup, Quinn and Evans remain directors of Triple Eight along with chairman Rex Devantier.
Blackmore bought into the business alongside Evans after both exited their previous sponsorship of Erebus Motorsport at the end of 2023.
The former will be absent from the next two Supercars events but is expected to attend the upcoming Darwin SpeedSeries round.
Triple Eight now runs cars in Mustang Cup following Blackmore’s purchase of a Dark Horse R now driven by young gun Ollie Wickham.
Whincup will also miss this weekend’s NTI Townsville 500 as he represents the team at the Goodwood Festival of Speed in the UK.
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