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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 Andy Kenopensky, a former appointee to the United States Metric Board. The team competed in CART from 1981 to 1990.

The team was the brainchild of IAM president William Winpisinger. It began sponsoring racing in 1978 by sponsoring a USAC Champ Car race at Trenton Speedway and sponsoring the Indy Car driven by Jerry Karl. The union formed its own team in 1981. From 1981 to 1988 it was additionally sponsored by Schaefer Beer alongside the Machinists Union branding. The team's most notable drivers during this time were Josele Garza who drove for the team from 1983 to 1987 and Roger Mears who drove for the team in 1982 and 1983.^{[citation needed]} Garza finished 12th in the CART championship in 1985 and 11th in 1987. Garza brought the team its best CART finish of second at the Michigan 500 in 1986. Mears finished 9th in 1982 and 12th in 1983 and finished fourth at Riverside International Raceway in 1982. Scott Atchison and Kevin Cogan drove for the team in 1988 and saw little success, although Cogan did register the team's best finish of third at the Long Beach Grand Prix in 1988, finishing 13th in the 1988 championship while Atchison finished 20th. Veteran driver Pancho Carter joined the team with co-sponsorship from Hardee's and finished 13th and 20th in two seasons with the team with a best finish of 7th, coming in his first race for the team.

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.

Throughout his involvement in the sport, team manager Andy Kenopensky was a constant critic of CART's management of the sport and complained that the racing was too expensive and that rules were being crafted to benefit large-budget teams at the expense of small-budget teams such as his own.^[1][2]

The union and Schaefer also sponsored a NASCAR Winston Cup entry for Joe Ruttman in the 1989 Daytona 500 fielded by CalCar Motorsports.^[3]

• Scott Atchison (1988)
• Pancho Carter (1987, 1989–1990)
• Kevin Cogan (1988–1989)
• Larry Dickson (1981)
• Chip Ganassi (1985–1986)
• Josele Garza (1983–1987)
• Pete Halsmer (1985)
• Jerry Karl (1978)
• Rupert Keegan (1985)
• Peter Kuhn (1984)
• Jan Lammers (1986)
• Randy Lewis (1984)
• Roger Mears (1982–1983)
• Rick Miaskiewicz (1987)
• Mike Nish (1986)
• Johnny Parsons (1984, 1986)
• Scott Pruett (1988)
• Chip Robinson (1987)
• Tom Sneva (1987)
• Sammy Swindell (1987) (failed to qualify)
• Phil Threshie (1980)
• Rich Vogler (1988)
• Desiré Wilson (1986)

(key)

Year	Chassis	Engine	Drivers	No.	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17
1980					ONT	INDY	MIL	POC	MDO	MCH	WGL	MIL	ONT	MCH	MXC	PHX
	IAM 001	Donovan V8	Phil Threshie	30		DNQ	22	25		DNQ		DNQ
			Larry Dickson										35			22
1981					PHX	MIL	ATL		MCH	RIV	MIL	MCH	WGL	MXC	PHX
	Penske PC-7/79	Cosworth DFX	Larry Dickson	31		10	10	12	9	16	12	8	7	22	DNQ
	IAM 001	Donovan V8	Teddy Pilette	67										DNQ1
1982					PHX	ATL	MIL	CLE	MCH	MIL	POC	RIV	ROA	MCH	PHX
	Penske PC-9B/81	Cosworth DFX	Roger Mears	31	8		22	21
	Penske PC-7/79					4			17	14	9	4	8	8
	Penske PC-10/82			9											7
1983					ATL	INDY	MIL	CLE	MCH	ROA	POC	RIV	MDO	MCH	CPL	LAG	PHX
	Penske PC-10/82	Cosworth DFX	Roger Mears	9	7	28	8	6	DNQ	8	16	9	12	16	7	6	16
			Josele Garza	55		25		17	19	11	9	20	23	17	11	12
1984					LBH	PHX	INDY	MIL	POR	MEA	CLE	MCH	ROA	POC	MDO	SAN	MCH	PHX	LAG	CPL
	Penske PC-10/82	Cosworth DFX	Josele Garza	55	23	DNQ
	March 84C						10	DNS	7	23	17	11	7	25	11	4	10	8	13	10
	Penske PC-10/82		Roger Mears				DNQ
1985					LBH	INDY	MIL	POR	MEA	CLE	MCH	ROA	POC	MDO	SAN	MCH	LAG	PHX	MIA
	March 85C	Cosworth DFX	Josele Garza	55	28	31	7	12	27	6	19	18	26	11	6	6	7	10	9
			Pete Halsmer	59		DNQ	15	8	19							11
			Chip Ganassi								22
			Rupert Keegan											19			12		10
1986					PHX	LBH	INDY	MIL	POR	MEA	CLE	TOR	MCH	POC	MDO	SAN	MCH	ROA	LAG	PHX	MIA
	March 85C/86C	Cosworth DFX	Josele Garza	55	23	7	18	7	17	8	7	23	2	7	14						24
			Desiré Wilson															19	16
				59											13
			Chip Ganassi		14		21
			Rick Miaskiewicz (R)															DNS
			Johnny Parsons					22			21		16	29
				95			27
				55												7	23			11
			Mike Nish (R)	45			DNQ
				59				DNS	10	24		22
	Eagle 86GC		Jan Lammers																8	23	9
1987					LBH	PHX	INDY	MIL	POR	MEA	CLE	TOR	MCH	POC	ROA	MDO	NAZ	LAG	MIA
	March 87C	Cosworth DFX	Pancho Carter	29			27						20	6	14	14	17	12	14
			Josele Garza	55	5	6	17	22	6	24	16	17	12	11	11	8	8	8	18
	March 86C		Mike Nish	59	DNQ	DNQ
			Rick Miaskiewicz								14	12				16
	March 87C								22
	March 86C		Tony Bettenhausen Jr.					DNQ
		Pontiac V8	Sammy Swindell				DNQ
1988					PHX	LBH	INDY	MIL	POR	CLE	TOR	MEA	MCH	POC	MDO	ROA	NAZ	LAG	MIA
	March 88C	Cosworth DFX	Kevin Cogan	11			11	22	20	10	24					24	15	9	4
	March 87C				8	3
			Scott Pruett									16			20
			Rich Vogler										15	11
				29			17
			Scott Atchison	55			DNQ											25	9
	March 86C				12	9	DNQ	16	25	12	13	10	10	12	15	20	DNQ
1989					PHX	LBH	INDY	MIL	DET	POR	CLE	MEA	TOR	MCH	POC	MDO	ROA	NAZ	LAG
	March 88C	Cosworth DFX	Kevin Cogan	11	10	26	32	19	17	24	11	12	9	25	22	10	18		8
			Johnny Rutherford															DNQ
			Rich Vogler	29			DNQ