Listen to this article Firestone advise against running when track and ambient temperatures don’t add up to 100degF and for most of this week, Speedway, IN has been struggling to reach that number. This week’s 2.4-liter engine test, conducted by Team Penske-Chevrolet and Chip Ganassi Racing-Honda on a slightly modified version of IndyCar’s standard road course layout, had to be extended to three days after cold and rain hampered meaningful running on the first two days. That first on-track testing of the 2024 engines (run without the hybrid components) concluded yesterday but further poor weather has caused disruption to the ‘regular’ current-spec IndyCar test. So bleak was the outlook for this week that Ganassi – which was only taking part in the test having pulled out of the postponed Texas Motor Speedway test due to cold weather – has switched its test day to Barber Motorsports Park next Monday. There, the quartet of Scott Dixon, Alex Palou, Marcus Ericsson and Jimmie Johnson will be joined by Rinus VeeKay and Conor Da …