A Perfect Fit Can Destroy an Engine?#piston #engineering #mechanic #carengine

It’s called crosshatch. The ring gap is very important also.

Rings, that's why

only F1 engine have clearance so small that they must warm the engine before starting it because when cold F1 Engine are technically seized

It’s called cross hatch honing of the cylinder wall. It’s designed to hold oil on the wall for lubrication of the rings. Furthermore, Pistons come in three types generally, cast, HYPERREUTECTIC and forged. Forge pistons, expand and contract more. Therefore they need more clearance to accommodate this. and there more DUARABLE therefore they’re used in racing and performance engines.

I like the clip of a pneumatic cylinder that has nothing to do with this.

Aluminum expansion is 2 to 3 times more than cast iron.

Pistons also taper from the skirt to the crown because the top end of the piston gets hotter and expands more than the skirt.

I seem to recall way back in the early eighties or maybe even farther back, when engine manufacturers were touting their new-found ability to laser cylinder walls, thus, to leave them "mercury-smooth." It seems they have since learned some kind of lesson there.

If you wanna see what happens when the piston is as tight as the cylinder is just run an engine without coolant. That'll answer your question.

But CJs' dap up 🔥🔥🔥✋️

Hydrodynamic wedge

That's why manufacturers use cast pistons for better expansion control vs forged.

That's why you NEVER RUN A CAR OUT OF OIL..NO OIL DEAD ENGINE..IT LOCKS UP. 🚗❤

the pistons expands

this gap is important for oil circulation inside engine

“Crosshatch”.. it’s so the oil has a surface to grab, and to drain🤷🏻

One of them shown was a twin cylinder air compressor 😐

Is that the people have noted? You’re already making a meal of this? You could answer the question in 10 seconds rings rings rings compression oil and scraper rings

You need the least amount of resistance as possible around the piston and so there needs to be a sufficient air gap to allow for the piston to expand from the heat to allow for the piston to move up and down as freely as possible and the multiple springy piston rings are the key thing that allows for the piston to move as freely as possible while providing a reliable seal for the air gap between the piston and the piston bore allowing for the essential compession that's absolutely needed to allow for the engine to actually run because without the compression in the combustion chamber there isn't any internal combustion engines in existence that can actually run.

Excellent explanation and video. Thank You!