2018 BMW HP4 Race

Engine Configuration Inline-Four, 4 stroke,
Engine Displacement 999 cc
Engine Cooling Liquid
Compression Ratio 13.7- 13.9:1
Combustion Chamber Design Pentroof
Valves Per Cylinder 4
Intake Valves Per Cylinder 2 (titanium)
Exhaust Valves Per Cylinder 2 (titanium)
Bore x Stroke 80.0 mm x 49.7 mm
Conecting Rod Length
Connecting Rod Material Steel
Claimed Peak Horsepower 215 bhp @ 13,900 rpm
Claimed Peak Torque 88.5 lbs. - ft. @ 10,000 rpm
Engine Redline 14,500 rpm
Valve Angle (Included) 11.2 degrees Intake/ 13.3 degrees Exhaust (24.5 degrees)
Combustion Chamber Volume 19.5cc
Valve Train Type DOHC, Reduction gear and Link-plate Chain, Finger Followers, Shim-in-retainer Lash Adjustment
Valve Adjustment Interval  
Intake Valve Diameter 33.5 mm
Exhaust Valve Diameter 27.2 mm
Intake Valve Stem Diameter 5.0mm
Exhaust Valve Stem Diameter 5.0mm
Intake Valve Maximum Lift  
Exhaust Valve Maximum Lift  
Intake Valve Timing
Open BTDC  
Close ABDC  
Exhaust Valve Timing
Open BTDC  
Close ABDC  
Valve Timing Measuring Point 3.0mm (lift)
Fuel Delivery System BMW BMS-K-P Digital Fuel Injection
Throttle Body Venturi Size 48 mm
Air Filter Type Pleated Paper
Exhaust System Type 4-1-2 (Titanium)
Ignition System Digital
Lubrication System Wet Sump
Oil Capacity 4.1 quarts (3.9 liters)
Fuel Capacity 4.6 gallons (17.5 liters)
Transmission Type 6-speed, Constant Mesh
Clutch Type Multi-plate, Wet, Back-torque-limiting
Clutch Actuation System Cable
Clutch Spring Type Coil
Number Of Clutch Springs 6
Number of Clutch Plates 19
Drive Plates 10
Driven Plates 9
Primary Drive Gear (straight cut)
Primary Drive Gear Teeth (Ratio) 76/46 (1.652:1)
Final Drive Sprocket Teeth (Ratio) 3/16 (2.687:1)
Transmission Gear Teeth (Ratios)
6th 31/24 (1.291:1)
5th 35/25 (1.400:1)
4th 34/22 (1.545:1)
3rd 38/22 (1.727:1)
2nd 44/22 (2.000:1)
1st 43/18 (2.388:1)
Transmission Overall Ratios
6th 5.730:1
5th 6.214:1
4th 6.858:1
3rd 7666:1
2nd 8.877:1
1st 10.600:1