With this strange formula, can you really evaluate the best naturally aspirated engine?

Wechat automobile 2021-08-12 08:51:54 阅读数:194

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strange formula really evaluate best

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Not too long in the future , We will miss the roar of the internal combustion engine in the past , Even many young people may forget what an internal combustion engine is .


See the diesel locomotive , Now people feel as strange as seeing carriages , Maybe there will be “ Diesel locomotive takes you to experience the original fun ” This kind of advertisement .


Nowadays, internal combustion engines have begun the era of scarcity , Turbines have become standard , Naturally aspirated , In particular, large displacement natural inhalation almost becomes “ Watch for Animals ”.


fun , Old school cognition , It's better to suck it from yourself .


Today we have an interesting formula , Like a physicist, calculate whether a naturally aspirated engine is good or not .


The trial method is not perfect , The substitution variable is only the horsepower 、 displacement 、 High and low speed .


It's fun after all , Except fast , And tossing .


Welcome to discuss at the end of the article .


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Author / Cool car *WanWan


  Preface  


Before , stay carthrottle I read a very interesting article on , Here to enjoy and discuss with you .


Which naturally aspirated engine is the best naturally aspirated engine in the world ?


Maybe someone will vote for Ferrari V12 engine , Some people prefer Lamborghini or Aston Martin , Maybe it's Carrera GT Or Lexus LFA Upper V10?


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One might point out that the best is actually from GM LS3 Or dodge 392Hemi? perhaps , In the early 90 The naturally aspirated version of the s 2JZ, Honda F20C Or Mazda renesis Rotor engine ?


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Is there a formula that can objectively , Instead of really measuring a naturally aspirated engine through subjective emotion ?


A lot of people will definitely say , Yes !


And give a familiar concept : Power up . In short , Increasing power is : The horsepower of the engine (hp)/ The displacement of the engine ( l ), The number obtained is the so-called power rise .


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however , Power rise is a very non objective calculation method , It's more biased towards high-speed engines .


The high-speed engine turns faster , So you can breathe in more air and produce more horsepower . For many models with large displacement , It does not require high speed to provide high horsepower , After all , No matter how high the speed is, it can't make up for the disadvantage of displacement .


therefore , In terms of power rise , Honda's small displacement and high-speed engine is often among the best , But some famous machines we are familiar with are not on the list .


And here , Is that we introduce a new formula .


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First , We divide engine horsepower by engine displacement by a number of engine peak speeds . The intuitive formula is : Engine horsepower / Engine displacement / Engine speed at peak output .


Be careful , Here is the engine peak output speed , Not the engine red line speed . After all , The engine's peak output speed is the most important , The red line is just a speed number designed by the manufacturer to prevent engine damage .


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Then , Multiply the previous number by a number called petrolheadedry The constant , English is constant of petrolheadedry. This constant is 2314000, The purpose of this constant is to ensure that the best naturally aspirated engine can be achieved 100 Value of score .


Here's the explanation , The definition of the best naturally aspirated engine is to use civil fuel , The compression ratio reaches 14.3:1. meanwhile , The fraction of rotor engine and two-stroke engine will be halved to reflect the difference between their stroke and traditional four stroke engine .


Ok, Explain so many theoretical details , Let's look at the specific figures .


 The Top 


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At the top , We see that F1 engine . The purpose of including racing engines here is to include as many naturally aspirated engines as possible .


This is from Ferrari F2004 The naturally aspirated engine became the first , And from 2006 Year of F1 Racing V8 Naturally aspirated racing engines followed .


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these F1 Naturally aspirated engines can achieve 20000rpm Speed of .


Of course ,F1 The engine does not use civilian fuel , however ,F1 The energy density and ideal ratio of engine fuel are similar to civil fuel , therefore , It also guarantees F1 Engine can be compared with ordinary engine .


next , We saw Pagani zonda R.


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This engine comes from AMG To build the V12 engine , however , What we must emphasize is , This is an illegal road version . Then , We saw the first legal road version of the vehicle :Ariel Atom 500 and Caparo T1.


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According to the data , The engines of both cars are from motorcycles , So you can easily achieve 10000rpm Speed of . next , We see that it's still a racing engine , It includes GP2 And some super motorcycles .


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lamborghini Huracan Performante It's the first one on this list “ normal ” The models .


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It can be seen that as one of the fastest models in the north ring of Nurburgring, it does have its own uniqueness . next , We saw some old cars , For example, with Mazda rotor engine 787B, And Cosworth DFV Racing engine .


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stay 60-80 years , quite a lot F1 The cars all use the... From Cosworth DFV engine , It was also one of the most successful racing engines of the year .


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next , We saw the first car that everyone could afford !Toyobaru!( notes : This is a toyota and subaru The joint name of ).


Considering the displacement and speed of the car , Especially the price , Who can imagine this ordinary GT 86 Have a Ferrari FXX K An engine with a high score ?


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Of course , There are some surprises on this form , Like Ferrari 812 Superfast Beat the LaFerrra.


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 The Middle 


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This form has nothing to say , So let's just pick some key points .


ferrari F50 Performed quite badly .


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Although this engine and Ferrari are F1 On the court V12 Racing engines are closely related , But its performance is not satisfactory . Again .BMW code-named E60 Of M5 Also used from F1 The engine of , But the score is not satisfactory .


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Although the displacement is larger ,AMG German muscle engine (6.2 Upgrade ) Got a pretty high score , And beat lower displacement such as Audi 4.2 l V8 Ford V8 engine .


code-named E30 Of M3 Defeated the code named E46 Of M3. This is absolutely amazing .


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Shelby GT350R Just cheaper than a Mustang GT A little better .


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Although Biran bokini huracan performante It's a lot more expensive , Historical status is also higher , however LFA And Carrera GT Have not been able to successfully enter the top few .


Ferrari's most classic 250GTO and 80 Vintage style F512M Eye catching performance , Especially when you consider the production year of these two cars .


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Japan's V6 The engine was disappointing . Especially Nissan VQ engine , As a modern engine and Nissan's many years of improvement , But the score is cold and says everything .


 The Bottom 


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First , It should be noted that there is a lower limit in this form , This is it. motorwagen.


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This is the first car in human history , So this one motorwagen Of 6.5 We were given a minimum value .


next , We saw some old models , The Beatles in Germany during World War II and the largest engine ever used in cars :BMW V12 Aviation Engine .


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although BMW This engine can only last a minute :[email protected]


The Prius is an interesting car . Because the car's engine uses the Atkinson cycle , Therefore, it will suck in less air than a naturally aspirated engine with the same displacement .


Then , We see that XK120.


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This is an extremely conservative engine to ensure reliability . Need to know , stay 1950 year , This car, this engine with 160km/h At the same speed for a whole week . The same principle can also be used in Toyota century , Rolls-Royce phantom And audi A8 W12 On the version .


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RX-8 The performance is very average , This is because the efficiency of the rotor engine is appalling .


The rotor engine has excellent performance in size and weight , But there are inherent deficiencies in fuel consumption and durability . This engine needs further tuning to stimulate its potential , Like Mazda 787b, But these modifications will make the rotor engine closer to a racing engine than a legitimate engine .


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BMW Of V8 The engine performed unexpectedly badly , Especially considering the price of the vehicle with this engine .


 What‘s next?


We have to look at the original comments on this article , After all , This new concept is always accompanied by criticism and correction .


 TheMindGarage   One parameter that these formulas do not take into account is the oil-gas mixing ratio . Like the Prius , In order to save fuel, reduce the fuel ratio .


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 AccountDeleted   This formula does not take into account... At peak torque rpm And engine weight , So it's pretty unreliable . The maximum speed should still be taken into account in these formulas . Another thing that is not considered is 2000rpm Output torque and horsepower . meanwhile , This formula significantly reduces the fraction of high output engines at low speeds .


 MunuelKunz   My car is Opel/Vauxhall Adam S,[email protected], engine 1.4 l , fraction 50.60, Then I found that this formula only applies to naturally aspirated engines .


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 Gareth   I love the idea , I also agree that power increase is not an objective figure . however , This formula has a serious error , And may not be able to correct .


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It is meaningless to just take a specific engine speed without comparing the engine output curve . This is why the Japanese system V6 Engines perform poorly on this formula, but they actually have a very wide torque curve , Especially the output at low speed .


If you use this formula , A standard Ferrari 458 The engine is only better than a Honda K20A High engine 2 A little bit .


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But in fact, Ferrari can provide additional... Per liter 10% The torque , So as to ensure daily use . And if we go further , ferrari V8 The engine is better than some V12 The torque per liter of the engine is even higher !


Toyobaru(GT86) And lower scores K20 In fact, the output is similar to :[email protected] however ,K20 Can be in 8000rpm Output 221hp and GT86 At that speed, the power of has fallen precipitously .


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Sum up ,BMEP Maybe it's the formula you want .


 Turtles   I like this comparison very much . I wonder how displacement affects power ? How does high speed affect power ? Is there a linear relationship between the two entries ?


 TheMindGarage:( reply )  It seems that the larger the displacement of each cylinder , The lower the score . however , Engines with many cylinders are designed to reduce efficiency ( Overly complex design ). Of course , There are some exceptions here .SLS AMG Although each cylinder has the maximum displacement , But the score is still high .


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