C/M Pistons PSI Piston-Punch (3)
C/M Pistons PSI Piston-Punch (3)
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Retrofit Kit. Piston Engine Energy
Dr Sydney Nicola Bennett is working on
March 22 - April 1. 2026 & onward
Piston Engines. New Air-Lung breathing source. Equivlant or higher than Combustion PSI. Clean burning as its air compression
UNDERSTANDING STROKE - BORE & PISTONS
With Wind-Tunnel Piston-Punch "Lung" based Air Compression Energy. Metered or not
Dr Sydney Nicola Bennett's design effectively replaces all forms of combustion
Oil - Gas refined to gasoline or diesel. Replaced
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https://faceprofiledrsydneynbennett.blogspot.com/2026/03/blog-post_22.html
PISTON ENGINES. FLYWHEELS - DEFINED
Dual Mass Flywheels
One of history's great art and science collisions is the invention of the potter's wheel in Mesopotamia around 3500 B.C. Potter's wheels led to the creation of flywheels, which helped artisans achieve smoother, more consistent revolutions while throwing clay. These foot-driven instruments are still used today, and the same principles are at work in the dual-mass flywheels you'll find in many modern cars with manual and dual-clutch transmissions.
A car's flywheel is a disc, usually made of aluminum, steel, or cast iron, bolted up to the end of the engine crankshaft. It's there to help start the engine, keep it running smoothly, and send power to the transmission. Automatics technically have flex plates instead of flywheels, but they're designed to accomplish the basically same thing.
The teeth on the flywheel's outer edge mesh with starter gears to help generate the oomph needed to get a diesel or gasoline engine to fire up. When it does, each power stroke creates a jolt of torque. The flywheel's weight and inertia help smooth out that power delivery, harnessing energy as rotational momentum.
A single-mass flywheel's surface engages directly with the clutch, and the clutch plate springs provide some dampening. But with a dual-mass flywheel, one disc that bolts to the crankshaft, and a second disc — hence "dual-mass" — syncs with the clutch. The two masses are connected by springs that dampen like suspension struts. Automakers will opt for a dual-mass flywheel in applications where there's massive torque, fewer cylinders, or a desire to quell noise, vibration and harshness.
1. Pros
Imagine cranking a horizontal steel rod with a 25-pound weight on the end. It's tough at first, but gets easier and smoother to turn as the weight picks up speed. This is what's happening when a flywheel spins, and how flywheels help keep the engine running when you're not accelerating.
Once a single-mass flywheel starts to rotate, its force is absorbed by the clutch and transmission driveline. In a dual-mass flywheel, when the first mass rotates, it compresses springs, which starts the second mass rotating along while absorbing some more of the shock coming through the crankshaft. That means less vibration is transferred to the transmission.
In high-torque situations like towing, this equates to transmission preservation and longevity. This is why a dual-mass flywheel is appealing in diesel engines, which outsell gas in heavy-duty trucks due to their stump-pulling prowess, and tend to run for eons.
In smaller engines with fewer cylinders, there are fewer overlapping power strokes. Automakers will fit dual-mass flywheels on four-cylinder cars, for example, to quell some of the harshness of those sporadic jolts — which are less of an issue in the best inline-sixes. Volkswagen, for example, uses dual-mass flywheels across the Golf GTI and Golf R turbocharged 2.0-liter inline-4 engine lineup, as well in Audi DSG transmissions.
Dual-mass flywheels provide a comfort benefit, because they help stifle the clunky shock that can come when accelerating from a standstill at lower RPMs. That can make stop-and-go traffic a little more pleasant. The result is everyday driving with smoothness and refinement, thanks to reduced drivetrain noise and vibration that might otherwise buzz through the the cabin.
2. Cons
Perhaps the biggest disadvantage of dual-mass flywheels is that they are expensive. And while a single-mass flywheel isn't necessarily cheap, it can be resurfaced, and that costs just a fraction of a new one. Dual-mass flywheels can't be resurfaced — you have to replace the whole thing if it fails.
If there's one thing failure loves, it's complexity. Two masses, springs, and associated parts introduce more potential problems. Single-mass flywheels are one solid lump.
Another consideration is weight. Factory dual-mass flywheels are usually pretty heavy, coming in at around 30 pounds. Where some see smoothness, others see sloth. All that mass sitting between the engine and transmission requires power to push, and time to unwind, which can feel less responsive. This is why enthusiasts and aftermarket performance parts companies turn to lightweight, dual-mass flywheels, with some coming in at 10 pounds.
Also from a performance standpoint, dual-mass flywheel parts may be tuned to handle a specific power output from the factory, which might not hold up if you add boost through a tune or new turbocharger. In these cases, owners can opt for a single-mass flywheel conversion, which up the noise and vibrations, but deliver a more direct power engagement between the engine and transmission.
https://www.jalopnik.com/2125199/why-automakers-use-dual-mass-flywheels/
Long-Vs-Short Stroke Engines
Just about every piston engine is defined by two basic measurements: bore and stroke. Bore is the diameter of the cylinder. Stroke is the distance the piston travels from bottom dead center to top dead center. Introduce a bit of math, including cylinder count, and those measurements eventually lead us to the overall displacement of an engine.
When bore and stroke are equal, the engine is described as "square." A long stroke is called an undersquare, meaning that the stroke is significantly longer than the bore, and a short stroke is called an oversquare, meaning it has a bore larger than the stroke.
When comparing long-stroke and short-stroke engines, and their associated benefits and drawbacks, it's useful to compare engines of equal displacement. That way, we can talk about the changes in bore and stroke as they relate to each other, and how those differences in engine design have effects on power, efficiency, and packaging.
Stroke Length
An increase in the distance a piston travels inside the cylinder, aka the stroke length, also increases the stresses acting on the piston and crankshaft. The longer the stroke, the more inertia has to be managed inside the cylinder. This is one of the main reasons why long stroke engines are not designed to rev very high.
A short-stroke engine has less inertial stress. Since the piston has less distance to travel, the acceleration of the piston is lower at the same rpm. All other factors being equal, this means that the engine can rev to a higher rpm before stress becomes a limiting factor. Short-stroke engines have an advantage where engine manufacturers are looking to maximize power, because power output is directly linked to engine speed — higher rpm means more horsepower. Some of your favorite high-revving supercars likely have short stroke.
Breathing Valves
However, engine speed isn't the complete picture. Stroke length also affects valve timing and combustion behavior, all of which shape performance.
So, the bottom end of an engine, with its cylinders and crankshaft have inertial stresses to deal with. Then, there's the effect bore has on the top end and components like valves. Larger bore cylinders have more room for valves, which regulate the flow of air and fuel into the combustion chamber. Larger valves allow for increased airflow into the cylinder.
Short-stroke engines directly benefit from this. Since their larger bores result in better breathing, they can create power at higher rpms. The opposite happens with long stroke engines. Since they have smaller bores, their valve sizes and resulting air flow is limited. Generally, this limited airflow is what makes long-stroke engines limited in their production of power.
There are also the effects that bore and stroke have on turbulence. Turbulence is basically the movement of the air-fuel mixture inside the cylinder. Smaller bores and deeper chambers hold longer turbulence and give faster combustion. Cylinders with larger bores and flatter chambers promote quick decay of turbulence. Earlier ignition timing is required to counter that, but that is also a double-edged sword, since it exposes the piston crown and the cylinder head to heat for longer periods. This increase in exposure can lead to an increase in heat loss and a decrease in efficiency.
Torque
A persistent belief is that long-stroke engines inherently produce more torque. That is not always true. Differences in bore and stroke result in changes in pressure, as well as lengthening or shortening of the effective lever arm, and those effects cancel each other out when the displacement stays the same. So stroke length by itself does not determine torque.
What does differ is where torque is produced. Ever heard the term "low-end torque"? Long stroke engines typically reach their peak torque at lower rpm. Smaller bores and valves limit high speed breathing, but the combustion process is well suited to lower engine speeds and a strong torque delivery at low rpm. This is why, when most people think of long-stroke engines, they think of relaxed performance at low speeds. This is also part of the reason why semi trucks don't use V8s, as the low RPMs put less strain on their engine, increasing reliability and decreasing operating costs.
Friction
As bore and stroke vary, so does friction. A longer stroke increases piston travel distance, raising friction. By limiting the distance a piston has to move, short-stroke engines have reduced friction and windage. Windage is the air resistance that the piston faces as it moves inside the cylinder, and like friction, it can cause loss of energy inside the engine. Another way short stroke engines manage the loss of energy is with a smaller crankshaft throw, which results in rotating components moving through a smaller arc.
Another issue to keep in mind is cooling. If the surface area of a piston is smaller, it's easier to cool. But as bore size increases, so does the distance heat must travel from the piston crown to the cylinder wall.
Long stroke engines with smaller bores benefit from easier piston cooling and reduced heat concentration. There's clearly a balance between these two dimensions: bore and stroke. Each has its benefits and drawbacks, and automakers have to design engines with all the science and math in mind.
https://www.jalopnik.com/2087668/long-stroke-versus-short-stroke-engines/
DR SYDNEY NICOLA BENNETT. CIG - C/M
P. Eng Design Engineer. Dr Sydney Nicola Bennett at C/M
C/M CYPRESS MOTOR SPORTS - PRIVATIZED
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LINK
Pistons PSI Piston-Punch (1)
https://faceprofiledrsydneynbennett.blogspot.com/2026/03/httpsfaceprofiledrsydneynbennett.html
Pistons PSI Piston-Punch (2)
https://faceprofiledrsydneynbennett.blogspot.com/2026/03/httpsfaceprofiledrsydneynbennett_22.html
Pistons PSI Piston-Punch (3)
https://faceprofiledrsydneynbennett.blogspot.com/2026/03/cm-pistons-psi-piston-punch-3.html
Pistons PSI Piston-Punch (4)
https://faceprofiledrsydneynbennett.blogspot.com/2026/03/httpsyoutube.html
STATIONARY VS MOTION METERING
Per Mile & Kilometer Metering Rates. If metered
https://faceprofiledrsydneynbennett.blogspot.com/2026/03/cm-2026-meter-rates-vs-2025.html
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