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NASCAR: Unleaded


Jim Covey, Engine Technical Director for GM Racing:
"If the teams can get through today's race -- given the stress 500 unrestricted miles puts on an engine anyway -- they will feel more comfortable going to a (track like) Bristol or Martinsville. Of all the tracks on the circuit, California Speedway is the toughest race track on an engine. If they can make it here, there shouldn't be any concerns at the other tracks on the tour."
And if they can't?

NASCAR debuted unleaded fuel in the Cup series today.

Dale Earnhardt Inc. driver Martin Truex Jr. fell out of Sunday's race on lap 16 due to a blown engine. Last year's championship contender Dale Earnhardt Jr. scored his second consecutive DNF and fell to 41st in the standings after his engine gave up on lap 120. Junior initially started to lose oil pressure on lap 66:
"I was really, really worried about the engines today because we blew two motors at the test in Las Vegas (in January) and I saw (teammate) Martin (Truex Jr.) blow up early on. We were able to get this one into the garage the first time without blowing it up like a grenade. If it's still intact, it's a lot easier for our guys to take it back to the shop and figure out what may be causing the problem. But, we went back out and it blew up big time. We're lucky to have next weekend off so we can spent that extra week figuring it out and be ready to race at Vegas. Everybody needs to keep their heads up and we'll figure it out."
DEI driver Paul Menard finished 20th, but also radioed in at one point with a vibration he thought was coming from the engine. Kasey Kahne's engine blew up early in the race, too, and Ken Schrader, Dave Blaney and John Andretti also had trouble.

The teams have had plenty of time to prepare for the switch to unleaded, but engine builders haven't mastered the adjustments necessary to compensate for the additional wear and tear on valves and valve seats caused by unleaded's lack of lubricity.

But that concern seemed to be an issue of running 500 miles vs. 300 or less.

These cars had trouble before they'd run even 100 laps. So, is it the fuel ... or is that just a coincidence?

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