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Is the piston skirt the portion that is cut out on one side or is that the piston crown?
Piston crown is the top, skirt is the side below the ring lands (ring grooves). The as you say, the skirt often has cut aways to clear the counterwieghts on the crankshaft.
2004 Subaru Outback knock on start up?
That is not a knock, that's a piston skirt slapping against the cyslinder wall. It is either #2 or #4 piston, and if you remove the piston you will find that all the moly coat has been rubbed off the skirt. A new piston is what you need.
What causes a piston skirt to collapse?
Poor lubrication. Excessive rpm's. Defective piston. Problem with the wrist pin, bushing or piston rod.
What are the Parts of the piston?
There is the penis, the testicles, the scrotum, the prostate, the sperm duct etc.
What is the standarad clearance between piston and sleeve?
most auto mechanic preferred .002 clearance from piston skirt to sleeve
What allows the piston more efficient cooling?
A larger piston skirt to cylinder wall contact raises piston cooling. With turbo motors, they have piston oilers, they spray oil on the underside of the pistons, cooling the piston /crown.
What is piston and its function?
piston is a plunger that moves ups and down in the engine block.the function of the piston is to compress air mixtures in the engine block
What is a diagonal wear pattern on a piston skirt indicates?
most likely a bent connecting rod.
What would cause a knocking sound in a motorcycle on cold days?
low oil and a loose piston skirt
What is the function of a piston rod?
It connects the piston to whatever the design calls for the piston to push or pull on. In a combustion engine, the piston rod connects the piston to the crankshaft, turning linear reciprocating motion into rotary motion.
Meaning of cam ground of piston?
Aluminum expands much more than Cast Iron, so when the piston to cylinder wal clearance is measured at room temperature there must an allowance to allow for expansion when the piston heats up. The amount of clearance depends upon the design of the engine and the anticipated operating temperature. Air-cooled engines run very hot so they require more clearance than water-cooled engines. On a Cushman piston the reference point for more clearance than water-cooled engines. On a Cushman piston the reference point for clearance measurements is at the top of the skirt perpendicular to the piston pin All areas of the piston do not expand the same; the top of the piston runs the hottest so it expands the most. The skirt runs the coolest so it expands the least. For this reason the diameter at top of the piston will normally be smaller, and the diameter at the bottom of the skirt will normally be a little larger, than the diameter at the top of the skirt. Also, the piston does not expand the same all the way around its circumference. The diameter measured across the piston pin will expand more than the diameter-measured perpendicular to the piston pin. Therefore, the piston is "cam ground", or made slightly oval, with the smaller diameter measured across the piston pin. When the piston heats up to operating temperature it will then be round. If the piston were not cam ground, the to operating temperature it will then be round. If the piston were not cam ground, the piston to cylinder wall clearance would have to be extremely high when the engine was cold to allow for expansion, and it would not be round when at operating temperature. This could cause piston slap and other problems. piston to cylinder wall clearance would have to be extremely high when the engine was cold piston to cylinder wall clearance would have to be extremely high when the engine was cold to allow for expansion, and it would not be round when at operating temperature. This could cause piston slap and other problems Cushman engines are usually set to a clearance of about .006 inch measured at the reference point described in paragraph one. The clearance at operating temperature will be much less, and if sufficient allowance is not made for expansion, the piston will expand to much less, and if sufficient allowance is not made for expansion, the piston will expand to the diameter the cylinder wall and freeze up. During break-in everything is running extra the diameter the cylinder wall and freeze up. hot due to the increased friction, and the piston temperatures get very high. If the engine is run at high speeds during this period it will almost always freeze up and may damage the run at high speeds during this period it will almost always freeze up and may damage the engine The following measurements are from a Cushman NOS +.030 cam ground piston Top of skirt perpendicular to the piston pin 3.024 (.006 clearance) Top of skirt measured across piston pin 3.011 Bottom of skirt perpendicular to pin 3.025 Bottom of skirt parallel to piston pin 3.012 Top of Piston and ring lands 3.005 In this case the clearance to a nominal 3.000 inch cylinder bore is .006 inch, the elliptica amount is .013, the skirt is .001 larger at the bottom than at the top, and the top of the piston is .019 less than the widest point on the skirt. These measurements are for llustration only and individual pistons may vary considerably
How does a rotating piston function in a diesel engine?
Piston never rotates. Piston moves up and down or to and fro. Pistons in some marine diesel medium speed engines (500 - 1000 rpm) have rotating pistons. Instead of having a gudgeon pin like most 4 stroke engines, these pistons have a spherical bearing. Inside the piston skirt is a circular ratchet system that rotates the piston as the connecting rod swings on each stroke. At 500 rpm, the piston rotates at about 10 rpm. Advantages are less wear, better lubrication and hence longer life.
