There are two ways that an internal combustion piston engine can transform combustion into motive power. These are the two-stroke cycle and the four-stroke cycle. A single cylinder two-stroke engine produces power every crankshaft revolution, while a single cylinder four-stroke engine produces power once every two revolutions.
In theory, a four-stroke engine has to be larger than a two-stroke engine to produce an equivalent amount of power. Two-stroke engines are becoming less common in developed countries these days, mainly due to manufacturer reluctance to invest in reducing two-stroke emissions.
Components of a typical, four stroke cycle, DOHC piston engine. (E) Exhaust camshaft, (I) Intake camshaft, (S) Spark plug, (V) Valves, (P) Piston, (R) Connecting rod, (C) Crankshaft, (W) Water jacket for coolant flow.
Here are some Pistons and rods connected with wrist pins.
You can see in this picture that the Stock OEM pistons here suffered allot of piston wall damage. this happened because of a rod barring failure, the small pieces of bearing material ware chewed up while being re circulated in the oil, and thus making its way to the pistons.
Aftermarket pistons ARIAS stocks an extensive range of forging blanks. From 1.750" to 6.250" and all in between we can
manufacture just about any piston from go-karts to tractor-pullers. Internal shapes range from
general use to dedicated, single-purpose designs. All blanks are either 4032 hi-silicon or 2618
non-silicon aluminum, or both, allowing our engineers virtually unlimited boundaries of design.
Here is a comparison between a stock Honda piston and an Arias piston. You can see the relief valve cut outs are more prominent and the dish is a little deeper, the structure of the walls is different as this aftermarket piston is cut out from a solid chunk of aluminum, and some manufacturers coat there pistons with heat sensitive material so dissipate the heat more efficiently. Where as the Stock Honda piston is a casted piece and then cut, polished and coated.
Just showing a motion pic
This is what your pistons might look like today if you pullled them out. this type of extensive carbon build up happens for a number of reason.
To give you an ideal on how much engineering it takes, here is a line up of what is in an Arias piston
1. Compression Height
2. Crown (Dome, Dish, Inverted Dome)
3. Deck
4. Dome Angle
5. Dome Diameter
6. Dome Profile
7. Dome Radius
8. Lock Groove
9. Oil Return
10. Pin Bore
11. Pin Oiler
12. Pin Span
13. Pin Tower
14. Plug Relief
15. Ring Band
16. Ring Groove
17. Ring Land
18. Ring Root
19. Side Relief
20. Skirt
21. Skirt Thickness
22. SS
23. Support Band
24. Tang
25. Valve Relief (VR)
26. VR Angle
27. VR C/L Out
28. VR Depth
29. VR Diameter
30. VR Stop
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Please Add to this with other Piston manufactures that YOU have had personal experience with.
