Alright this is a numbers game for sure. alright hp/l is greater on imports then American cars usually. Lets see how they make this power and this also goes along with the motorcycles. American engines are made to produce more mid range power then almost any Japanese car. Jap cars are made to make hp at very high rpms. American cars usually have bigger tq numbers lower rpms while jap cars usually are torque-less. Rx-8s about those.... well they make a ton of power per liter but look at the torque! its a damn joke. I went to the drag strip and this guy had a extremely loud high revving rotary motor and couldn't keep up with most b series n/a hondas. rotary motors are really only good with turbos, which then you have to rebuild the motor and so on so forth. The new ford motors are super impressive. the eco-boost and the duratec line of motors are honestly detuned. the new 5.0L makes 412 hp at the crank. tune it and it puts 402 whp down. They are really detuned from factory. the 3.7 in the v6 mustangs are at 305hp at the crank they usually pick up 25hp on a tune. they are extremely tunable. I have a vw Gti that has grabs 172tq at 1900rpm. It runs out of steam in the higher rpm range but thats cause its made to be a tq monster. the german/euro cars has similar ways of making power that the American cars have. Bigger motor, higher intake velocity= more tq. Slap a cylinder head with the flow that a Japanese motor has on a high displacement motor and rev the piss out of it youll achieve the beloved hp/L ratio but your tq will go down the drain.
This man knows what he's talking about...
And don't get me started on rotary engines, OMG the biggest lame brain idea...
It's completely Asinine their "displacement" numbers. They're not amazing "per litre" power makers... They're HUGE f*cking engines. Each face, on the mazda built rotaries, is 654cc... Each face... there's 3 faces on each rotor. for EACH rotor, the potential engine displacement is 654... so 654x3 is 1962cc... 2 liters PER rotor... That means a twin rotor is 4 liters... FOUR liters. I don't care that each rotor is spinning at 1/3 the speed of the eccentric shaft, the COMPLETE combustion cycle of EACH rotor is 3 faces. 3 faces per 2 rotors is 4 liters....
200hp from a 4 liter engine ISN'T phenonal nor is its HP/liter. They're a complete sham. I was a big fan of rotary engines until I realized the way they're "counted" is a numbers game. It's creative math... I'm not impressed at all by the torque they put out... a conventional ICE will out do any rotary displacement for displacement. There's a reason they get horrible gas mileage... it's not because it's inefficient, it's because that's as efficient as you can get a 4 liter engine with no power... Rotary engines are a joke.
NOW, lets get down to the torque thing...
Torque... That's what we HAVE here... that's what's needed in this country, we have high speed freeways and lots of acceleration is needed. Torqueless wonders are only fast because they save time shifting and they carry torque up into Higher RPMs. Horsepower in and of itself is ONLY a function of torque and RPM.
I hate when people talk about HP/liter because it's a fantasy number... It's used by people who don't know what they're talking about to try to sound like they've got the upper hand...
HP/Liter... BS, you can make 100hp/liter with carburated cars... many Toyota Levins and Truenos can pull off that number. The REAL test of efficient power is TORQUEper Liter...
Natural Aspiration and small engines just can NOT get the torque they need to do anything. You have to rev the hell out of car to get the power down with small engines. Most companies are recognizing this. Honda had a car called the S2000. I'm sure most of us car guys are very familiar with said car. This car, when it came out, was the epitome of the Honda Powered 4cylinder Gutless wonder... The car was SO bad that halfway through its lifecycle Honda ACTUALLY increased the displacement and lowered the Rev limit because its customers complained of lack of power...
Lack of power? How can that be it was making 100+hp / liter... the problem was it was BARELY making 75lb-ft per liter AT its peak, which means it was making 50- 60lbs-ft per liter in most of its rev range.... You know what 50lbs-ft per liter is in that car?! 100lbs-ft of torque... 100lbsft of toque!!!!! That's a f*cking GEO METRO! The S2000 handles, yes, i give it that. And one a race track at high revs, it can put its 160lbs-ft to use more often... However on the road, they were completely useless...
Torque is FAR more important than Horsepower... well Both are very important, but the ONE thing I'm REALLY happy about with American manufacturers is that they're picking up the torch... Most Japanese manufacturers are trying to make their small engines as powerful as possible but they're STILL lacking torque. It's because they don't have to worry about the acceleration loads on their highways. The highways that we have here require TORQUE. In Europe (Especially Germany and France) They have the SAME highway issues, need for acceleration... a lot of American manufacturers and European manufacturers recognize the need for a car to be livable day to day and reliable. They've all employed some form of forced induction NOT for horsepower... but for TORQUE and fuel efficiency. Take a look at Mercedes dropping their Big engines and going turbo... BMW that once said "Turbocharging is the cheap shortcut to horsepower" is now realizing in order to not get embarassed by their competition, they need to put some huffers on their cars... Low and behold, BMW 528i is back, this time with a 4 cylinder turbo... And amazingly, it gets better gas mileage AND is FASTER than its naturally aspirated predecessor (still over priced though).
the new Dodge Dart uses a 1.4 liter engine turbocharged... The base engine is a 2.0 with 160 horsepower and 148lbs-ft of torque... The 1.4 liter is 160 horsepower and 184lbs-ft of torque.... I'll give you a few seconds to guess which one is faster...
they both have 160hp, but one is going to get murdered by the other and one with the smaller engine (which, BTW is actually more fuel efficient as well) is going to be the faster of the two...
Torque is the determining factor in the importance of an engine... you can make 100hp/liter all day, but you can't make 100lbs-ft per liter... Not without some help.