Normally Aspirated Engine BMEP Comparison

Brake mean effective pressure, or BMEP, is the measure of efficiency that express engine output relative to engine displacement. Simply put, BMEP is the average effective pressure of the cylinders as they progress through intake, compression, ignition and exhaust strokes.

The work accomplished during one engine cycle divided by the engine swept volume. It is essentially the engine torque normalized by the engine displacement. The word "brake" denotes the actual torque/power available at the engine flywheel as measured on a dynamometer. Thus, BMEP is a measure of the useful power output of the engine. The best NA engines are the ones that can maintain high BMEP at high rpm.

http://www.tsrsoftware.com/bmep.htm


4-Stroke BMEP = (HP * 13000) / (Disp [liters] * RPM [@max HP])

Excellent Engine Design


2004 Honda S2000 Inline-4: (250 * 13000) / (2.157 * 7800) = 193 psi

2003 Honda S2000 Inline-4: (240 * 13000) / (1.997 * 8300) = 188 psi

Porsche 911 GT3 Flat-6: (380 * 13000) / (3.600 * 7400) = 185 psi

McLaren F1 (BMW) V-12: (627 * 13000) / (6.064 * 7400) = 182 psi

Ferrari 360 Stradale V-8: (425 * 13000) / (3.586 * 8500) = 181 psi

Ferrari Enzo V-12: (650 * 13000) / (5.998 * 7800) = 181 psi


Very Good Engine Design


Lotus Elise (Toyota) Inline-4: (190 * 13000) / (1.796 * 7800) = 176 psi

Acura RSX Type-S Inline-4: (200 * 13000) / (1.998 * 7400) = 176 psi

Acura TL V-6: (270 * 13000) / (3.210 * 6200) = 176 psi

BMW 330i w/PP Inline-6: (235 * 13000) / (2.979 * 5900) = 174 psi

Saleen S7 OHV V-8: (550 * 13000) / (7.008 * 5900) = 173 psi

Nissan 350Z V-6: (287 * 13000) / (3.498 * 6200) = 172 psi

Porsche Carrera GT V-10: (605 * 13000) / (5.733 * 8000) = 171 psi

Maserati Coupe V-8: (390 * 13000) / (4.244 * 7000) = 171 psi

BMW M3 Inline-6: (333 * 13000) / (3.246 * 7900) = 169 psi

Porsche Boxster S Flat-6: (258 * 13000) / (3.179 * 6250) = 169 psi

 

Good Engine Design


Acura NSX V-6: (290 * 13000) / (3.179 * 7100) = 167 psi

Porsche 911 Flat-6: (315 * 13000) / (3.596 * 6800) = 167 psi

Honda Accord V-6: (240 * 13000) / (2.997 * 6250) = 167 psi

Lamborghini Gallardo V-10: (493 * 13000) / (4.961 * 7800) = 166 psi

Porsche Cayenne V-8: (340 * 13000) / (4.511 * 6000) = 163 psi

Rolls-Royce Phantom (BMW) V-12: (453 * 13000) / (6.749 * 5350) = 163 psi

Lamborghini Murcielago V-12: (580 * 13000) / (6.192 * 7500) = 162 psi

Acura TSX Inline-4: (200 * 13000) / (2.354 * 6800) = 162 psi

Lexus GS430/SC430 V-8: (300 * 13000) / (4.293 * 5600) = 162 psi

Infiniti G35 Sedan V-6: (260 * 13000) / (3.498 * 6000) = 161 psi

Lexus IS300 Inline-6: (215 * 13000) / (2.997 * 5800) = 161 psi

Honda Civic Si Inline-4: (160 * 13000) / (1.998 * 6500) = 160 psi

Audi TT 3.2 V-6: (247 * 13000) / (3.189 * 6300) = 160 psi

Mitsubishi Eclipse GTS V-6: (210 * 13000) / (2.972 * 5750) = 160 psi

 

Average Engine Design


Ford SVT Focus Inline-4: (170 * 13000) / (1.988 * 7000) = 159 psi

Audi A8L V-8: (330 * 13000) / (4.172 * 6500) = 158 psi

Toyota Camry/Solara V-6: (225 * 13000) / (3.311 * 5600) = 158 psi

BMW M5 V-8: (394 * 13000) / (4.941 * 6600) = 157 psi

BMW 745i V-8: (325 * 13000) / (4.398 * 6100) = 157 psi

Subaru Impreza 2.5 RS Flat-4: (165 * 13000) / (2.457 * 5600) = 156 psi

Aston Martin Vanquish V-12: (460 * 13000) / (5.925 * 6500) = 155 psi

Chevy Corvette C5 Z06 OHV V-8: (405 * 13000) / (5.665 * 6000) = 155 psi

Infiniti M45/Q45 V-8: (340 * 13000) / (4.494 * 6400) = 154 psi

Mitsubishi Lancer Ralliart Inline-4: (162 * 13000) / (2.378 * 5750) = 154 psi

Mazda 6s V-6: (220 * 13000) / (2.967 * 6300) = 153 psi

Subaru Outback H6-3.0 Flat-6: (212 * 13000) / (3.0 * 6000) = 153 psi

Chrysler Crossfire (Mercedes) V-6: (215 * 13000) / (3.199 * 5700) = 153 psi

Audi S4 V-8: (340 * 13000) / (4.163 * 7000) = 152 psi

Nissan Sentra SE-R Spec V Inline-4: (175 * 13000) / (2.488 * 6000) = 152 psi

Jaguar S-type/XJ8/XK8 V-8: (294 * 13000) / (4.196 * 6000) = 152 psi

VW Phaeton W-12: (420 * 13000) / (5.998 * 6000) = 152 psi

Mercedes CLK55 AMG V-8: (362 * 13000) / (5.439 * 5750) = 151 psi

VW GTI VR6 V-6: (200 * 13000) / (2.792 * 6200) = 150 psi

Cadillac CTS V-6: (255 * 13000) / (3.564 * 6200) = 150 psi

 

Poor Engine Design


Hyundai Tiburon GT V-6: (181 * 13000) / (2.657 * 6000) = 148 psi

Jaguar X-type 3.0 V-6: (227 * 13000) / (2.967 * 6800) = 146 psi

VW Passat W-8: (270 * 13000) / (3.998 * 6000) = 146 psi

Ford Mustang Mach 1 V-8: (310 * 13000) / (4.605 * 6000) = 146 psi

Chevy Corvette C6 OHV V-8: (400 * 13000) / (5.970 * 6000) = 145 psi

Mazda Miata Inline-4: (142 * 13000) / (1.839 * 7000) = 143 psi

Chevy Corvette C5 OHV V-8: (350 * 13000) / (5.665 * 5600) = 143 psi

Cadillac XLR/SRX V-8: (320 * 13000) / (4.565 * 6400) = 142 psi

Mercedes CLK500/E500/SL500 V-8: (302 * 13000) / (4.966 * 5600) = 141 psi

Dodge Viper SRT-10 OHV V-10: (500 * 13000) / (8.285 * 5600) = 140 psi