For example, a V8 Bi-Turbo G63 AMG has 577 BHP and a Twin-Turbo V8 Koeniggsegg has 1160 BHP. How do virtually the same engines have such a large discrepancy?
In: Engineering
At it’s core, an engine is an air pump. The more air it can pump, the more power it makes.
There are four main ways to get an engine to be able to pump more air:
* Make it bigger (displacement). This is the most direct way.
* Make it pump faster (rpm). If it goes faster, it will pump more air in the same amount of time (i.e. you go farther running for a minute than walking for a minute).
* Pressurize the air going in (turbo/supercharging). If the air is “smaller”, more fits in the pump at once.
* Remove restrictions to airflow. If the pump is less restricted, it can move more air. Think about trying to breathe through a straw versus breathing through a snorkel.
If one engine makes more power than another, it’s doing it by one or more of the above.
V8 only tells you how the cylinders are oriented. it doesn’t tell you displacement, flow characteristics, stroke bore ratio, etc etc. and as both a turbo’d, V8 doesn’t tell you how much boost they’re running the turbo’s at. the G63 run s 17.4 psi boost. the Koeniggsegg runs 24.7 to 31.9 psi. the G63 is a 4.0L. Koeniggsegg runs a 5.0L
Cylinders and displacement is not a good estimate of a cars performance. There are many more design elements.
It’s like say two people weigh 250lbs but one can bench press 300lbs while another can do only 150lbs. Why?
Your definition of “virtually the same” is incorrect. The G63 is luxury SUV and the Koeniggsegg is a barely legal race car.
Yes, both have dual turbo 5L-ish V8 engines, but all the fuel management and engine computer controls are completely different.
Well, they’re not remotely virtually the same. V means the shape of the pistons is V-shaped. 8 because there are 8 pistons/cylinders. Other than that, they’re completely different engines. The Koeniggsegg engine is larger, 5.0L versus 4.0L. The Koeniggsegg engine revs up to 8,500rpm while the AMG engine only revs to 6,000rpm.
Basically the engines are completely different except their general shape and number of pistons.
The size of the cylinders can change the efficiency of the engine can be better or worse and if there are power adders eg turbos superchargers nitrous can all change the power output of and engine tldr not all v8s are the same size and there are things that can be done to change the power output becides size
It’s like trying to measure your FPS in a video game SOLELY by how many cores your processor has. There are LOTS of other variables involved with the various other parts – RAM speed, bus speed, video card, settings, etc.
In a car you have total CC displacement (i.e how big the cylinders are), intake manifold, exhaust manifold, air intake, lubrication, fuel, transmission, exhaust layout, just to name a few.
1st: Horsepower is a measure literally of torque and RPM. With a given RPM you can increase the horsepower by increasing the torque. Likewise your engine can gain horsepower by running higher rpms for a given torque number.
To gain torque you need to move more air as an engine is just an air pump. The more air you move, the more energy you have. That combined with the stroke length gives you torque.
To increase torque therefore you can increase the size of the engine, increase the air flowing into the engine to allow for more fuel to burn, decrease the drag and rotating mass of each part.
Turbo charging increase the air flowing into the engine so more fuel can burn.
A larger displacement increases the size of the cylinder so more air can be compressed and (longer throw or fatter cylinder) more torque.
Increasing the cylinders decreases the mass of a given piston and gives you more pistons to derive torque from. It also allows for higher RPM because it is smoother. The problem is more resistance and more parts to break so there is a limit to the return.
**The question you want is how does increasing the engine size by 25% increase the output by ~100%**
So they increased the size of the cylinders, changed parts so they can rev higher and increased the boost running into the engine.
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