Questions tagged [horsepower]

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2answers
39 views

Are there any methods to figure out how aerodynamic a race car is without a Cd number?

For the top speed of a car, I believe it's usually limited by drag and horsepower. However, I've also learned that gearing can affect the top speed and acceleration of a car. Are there any methods to ...
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1answer
58 views

Is there such thing as horsepower per cylinder?

I've heard of power per liter but is there such a thing as power per cylinder? I mean, I know more cylinders would mean more power for an engine. For example, a 6.0 L naturally aspirated V12 can make ...
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2answers
58 views

Effect of same engine but with slightly less capacity (cc) and hp

There's a vehicle whose engine is 1332cc which produces 94 hp in its home country. It was recently launched in my country with the same engine, but they downsized it to 1299cc (91 hp) for tax benefits....
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1answer
83 views

Which engine type gives more HP- two or four cycle?

Same max. RPM and CC of course. And if possible, an explanation would be nice. Thanks!
0
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1answer
250 views

CC per HP in a 2-stroke engine?

I have a bunch of 2-stroke engines and the websites that I found only tell me about 4-cycle engines. Do you happen to know the ratio of cc to HP?
1
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1answer
258 views

Lighten flywheel to increase top speed?

i have an old gasoline fueled skiff that only makes 3-4 knots. I find this to be strange since the engine is rated at 10-12 horsepower. It isn't that heavy and i figure it should be able to do more. ...
7
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5answers
7k views

Does an increase in horsepower allow a greater speed in any given gear?

I wasn't sure if this was the best place to post this, or if I should go post it in the physics stackexchange as well. I can crosspost if this question would be more fitting over there. To put this ...
1
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0answers
536 views

What limits the max power rating of a V belt drive?

We know that belt drives are limited in their max possible power rating and most high power/torque applications(trucks) use gear drives. I wanted to know the main factor that limits the power/torque ...
4
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4answers
129 views

Work over time; humans versus automobiles

I've been doing some research lately on torque and horsepower to understand how they are connected to one another. Take my car, a 2.0 TDI, outputs 390 Nm torque. 390 Nm alone without considering an ...
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4answers
492 views

Is horsepower determined by the pressure in the combustion chamber?

Forgive me I'm new and learning all this. I want to know is the horsepower determined by how much pressure is in the conbustion chamber? I asked cause i seen away to increase horsepower is to add a ...
2
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1answer
286 views

Where did the term horsepower originate?

After searching through the archive under the tag horsepower, horsepower history, history horsepower and horsepower history I didn't see this question asked but where and why do we use "horse" in the ...
1
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1answer
1k views

Engine specifications for 10.2 liter Chevrolet V8 [closed]

In an effort to design a theoretical engine capable of outputting 3000 horsepower, I was hoping to emulate the 10.2 liter Chevrolet V8. What are the specifications for this engine? I was hoping for ...
8
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2answers
835 views

Shouldn't a loss of compression equal a loss of power?

I recently did a compression test on a Nissan B13 GA16DE and got 125, 127, 122 and 140 PSI (cold). A few years ago, all 4 cylinders got 135-140 PSI, cold. Shouldn't this loss of compression have led ...
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1answer
439 views

Please explain Horsepower and Torque [duplicate]

I have been trying to understand both of these for a while. While I kind of understand them for some reason I feel like I'm missing the point. Simple explanations leave me confused and longer ...
10
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2answers
6k views

Horsepower at wheels calculation

I have used Torque Pro App for sometime in my Hyundai i10 Era (2011 model) and it gives me Horsepower at wheels. But the values seems to be much less. To find out the problem, I logged the car OBD ...
2
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0answers
69 views

How durable are engines at maximum power [closed]

The maximum horsepower figures of most car engines have been high for many decades.How long would an engine last on the dyno when making max HP ? How would this expected life drop when aftermarket ...
2
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0answers
314 views

What actually is brake horsepower (BHP)? [duplicate]

I know that BHP is the measure of power of an engine. I realised that I have no idea how the number (for example 540 BHP) relates to the engine itself. Does 1 HP mean one rotation of the crankshaft ...
8
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4answers
17k views

Conversion from kW to HP?

Many of the European manufacturers of cars and motorcycles publish their ICE power numbers to reflect kW rather than HP. Is there a reason for this? What is the conversion for kW to HP?
5
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3answers
4k views

How accurate and precise is a dyno and why?

It was pointed out to me that if you do two back to back runs of the same car on the same dyno the graph of the results will be different. Also, if you run the exact same car on two different dynos ...
8
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1answer
973 views

How do old cars actually lose horsepower?

I have heard that when a car gets old it slowly but surely loses its horsepower to some degree. For example, I used to drive a 1997 Ford Fiesta with a 1.25L 1242cc engine that supposedly produces a ...
10
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1answer
1k views

How do you plan an engine build?

What must be accounted for when building an engine for performance applications? How do you methodically plan a build? Take for instance a stock Small Block Chevy. Budget I understand with an ...
11
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5answers
541k views

What is the meaning of BHP and torque in bikes or cars?

BHP = Brake horse power. It says that it is brake horse power but it is generally relates with high pick up (your bikes reaches top speed in lesser time). So what does this actually mean?. Torque = ...