is it to compensate for uneven heat expansion ,to reduce piston weight toincrease piston strength or to reduce connecting rod loading?
2006-10-09 11:27:15 · 4 answers · asked by maczx9r 1 in Cars & Transportation ➔ Maintenance & Repairs
Yes, because the heavy section where the wrist pin passes through expands more than the thinner parts. When it is ground in that oblong shape it expands into a round shape at operating temperatures, allowing for tighter tolerances and reduced weight given its strength.
2006-10-09 11:30:52 · answer #1 · answered by Rockvillerich 5 · 0⤊ 1⤋
Piston cams are ground to open and close the valves in a precise way. For example when the piston is on the intake stroke the cam opens the intake valve to suck in the fuel air mixture. On the compression stroke the cam closes the valves as the piston travels upward and on the exhaust stroke the cam opens the exhaust valve to blow out the exhaust. There is a cam lobe for each valve. There are different "grinds" on cams that change the performance of the engine. A stock engine has a cam grind that is designed to make the engine run efficiently where as a racing cam give the engine much better performance at the cost of efficiency.
2006-10-09 18:42:28 · answer #2 · answered by Captleemo 3 · 0⤊ 0⤋
I was always taught it was because of the tight tolerances between the piston head and the cylinder shaft.
2006-10-09 18:30:43 · answer #3 · answered by Benny 2 · 0⤊ 0⤋
probably to decrease wear,
2006-10-09 18:31:04 · answer #4 · answered by 株式会THE CITADEL 株式会 4 · 0⤊ 0⤋