<P> The cars are powered by EFI V8 engines with compacted graphite iron blocks and pushrod valvetrain s actuating two - valves per cylinder , and are limited to 358 cubic inches ' ( about 5.8 liters ) displacement . However , modern technology has allowed power outputs near 900 horsepower ( 670 kW ) in unrestricted form while retaining the conventional basic engine design . In fact , before NASCAR instituted the gear rule , Cup engines were capable of operating more than 10,000 rpm . A NASCAR Cup Series engine with the maximum bore of 4.185 inches ( 106.3 millimeters ) and stroke of 3.25 inches ( 82.55 millimeters ) at 9,000 rpm has a mean piston speed of 80.44 fps ( 24.75 m / s ) . Contemporary Cup engines run 9,800 rpm , 87.59 fps ( 26.95 m / s ) , at the road course events on Pocono Pennsylvania 's long front stretch and at the . 526 - mile short - track Martinsville Speedway . At the backbone 1.5 - to 2.0 - mile tri-oval tracks of NASCAR , the engines produce over 850 hp running 92 -- 9400 rpm for 500 miles , 600 mi for the Coca - Cola 600 Charlotte race . </P>
<P> The cars are powered by EFI V8 engines with compacted graphite iron blocks and pushrod valvetrain s actuating two - valves per cylinder , and are limited to 358 cubic inches ' ( about 5.8 liters ) displacement . However , modern technology has allowed power outputs near 900 horsepower ( 670 kW ) in unrestricted form while retaining the conventional basic engine design . In fact , before NASCAR instituted the gear rule , Cup engines were capable of operating more than 10,000 rpm . A NASCAR Cup Series engine with the maximum bore of 4.185 inches ( 106.3 millimeters ) and stroke of 3.25 inches ( 82.55 millimeters ) at 9,000 rpm has a mean piston speed of 80.44 fps ( 24.75 m / s ) . Contemporary Cup engines run 9,800 rpm , 87.59 fps ( 26.95 m / s ) , at the road course events on Pocono Pennsylvania 's long front stretch and at the . 526 - mile short - track Martinsville Speedway . At the backbone 1.5 - to 2.0 - mile tri-oval tracks of NASCAR , the engines produce over 850 hp running 92 -- 9400 rpm for 500 miles , 600 mi for the Coca - Cola 600 Charlotte race . </P>
what kind of engines are in nascar cars
what kind of engines are in nascar cars
EFI V8
EFI V8