Questions tagged [horsepower]

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2 answers
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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 ...
0 votes
1 answer
68 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 ...
0 votes
3 answers
90 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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1 vote
1 answer
89 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!
  • 137
0 votes
1 answer
636 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?
  • 137
1 vote
1 answer
273 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 votes
5 answers
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 vote
0 answers
590 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 ...
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4 votes
4 answers
140 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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1 vote
4 answers
523 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 ...
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2 votes
1 answer
312 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 vote
1 answer
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 votes
2 answers
848 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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0 votes
1 answer
450 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 votes
2 answers
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 ...
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2 votes
0 answers
70 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 ...
  • 2,053
2 votes
0 answers
316 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 votes
4 answers
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?
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5 votes
3 answers
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 votes
1 answer
1k 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 votes
1 answer
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 votes
5 answers
543k 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 = ...
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