Machinists Union Racing was a CART Indy Car team owned by the International Association of Machinists and Aerospace Workers and run by the IAM's national automotive coordinator , a former appointee to the United States Metric Board. The team competed in CART from 1981 to 1990. All team members were card-carrying members of the IAM. They had initially experimented with building their own chassis in 1980 but it was abandoned before it hit the track. The union and Schaefer also sponsored a NASCAR Winston Cup entry for Joe Ruttman in the 1989 Daytona 500 fielded by CalCar Motorsports.