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What else can I help you with?
Where does maximum cylinder bore wear normally occur and why?
most cylinder wear occurs at the top fo the ring travel. Pressure on the top ring is at a peak and lubrication at a minimum when the piston is at the top of its stroke
Why is cylinder wear greater at the top of the bore?
Cylinder wear is greater at the top of the bore primarily due to higher temperatures and pressures experienced in that area during combustion. As the piston moves upward, the top of the cylinder encounters more intense heat from the combustion gases, which can lead to thermal expansion and increased friction. Additionally, the lack of sufficient oil lubrication at the top of the bore can exacerbate wear, as oil tends to pool lower down in the cylinder. This combination of factors results in accelerated wear at the top compared to the rest of the bore.
What is an engine cylinder parent bore?
The engine cylinder parent bore refers to the original, factory-machined diameter of the cylinder bore in an engine block before any modifications or oversizing are performed. It serves as the baseline measurement for the cylinder's dimensions, ensuring proper fitment for pistons and rings. If the engine undergoes wear or damage, the cylinder may be honed or bored to a larger size, but the parent bore remains the starting reference point for these alterations.
Is a cylinder taper is the difference in a cylinder diameter between the bottom of the cylinder bore and the top of the bore just below the ridge?
Yes, a cylinder taper refers to the difference in diameter between the bottom of the cylinder bore and the top, just below the ridge. This taper can affect engine performance and efficiency, as it may lead to uneven wear on piston rings and reduced sealing effectiveness. Measuring cylinder taper is important during engine rebuilds to ensure proper fit and function.
What causes the bore measurement to be larger at the top of cylinder than bottom?
The bore measurement is typically larger at the top of the cylinder than at the bottom due to factors like thermal expansion and wear patterns. As the engine operates, heat causes the cylinder walls to expand, which can lead to a slight increase in diameter at the top where temperatures are generally higher. Additionally, wear from piston movement and combustion can cause the top of the cylinder to experience more erosion over time, resulting in a larger bore measurement at the top compared to the bottom.
What causes cylinder taper?
Taper is the wear of the cylinder bore that causes that bore to be cone shaped or "tapered"This caused by several factors including:Fuel washing oil off the cylinder wallsThe side forces created by the operation of the piston against the crank through the connecting rodAnd many other factors
Where on the cylinder walls does the greatest amount of wear occur?
The greatest amount of wear on cylinder walls usually occurs at the very top of the cylinder, near the combustion chamber. This area is exposed to the highest temperatures and pressures during the engine's operation, leading to increased wear.
How do you determine how much to over bore engine?
You determine how much to bore an engine by how much wear is on cylinder walls if wear exceeds .003 thousands over factory specs then it must be bore to the next .010 thousands over cylinders are only bored in .010 thousands increments and every measure is using factory specs as reference point
What is the maximum cylinder wear on a Chevrolet 350 engine?
If you have to ream the ridge to get the old pistons out, you probably need to bore the cylinders and install oversize pistons. This assumes it was taken apart in the first place because of low cylinder pressure or excessive oil consumption (ie: worn rings). If there's not enough ridge to prevent you from pushing the pistons out of the bores, you can probably hone it out and re-ring the old pistons. If there is a ridge at the top of the cylinder, you need to bore it. The general consensus is that a rebuilt engine will wear out rapidly if there is any amount of taper. If you can catch a fingernail on the ridge, it's too much The upside is, if you bore it, put in new pistons and polish or turn the crank and replace the oil pump, you effectively have a new lower end and it should last 200,000 miles if properly maintained.
Where does minimum cylinder wear occur?
Minimum cylinder wear typically occurs in areas where there is optimal lubrication, proper alignment, and consistent operating temperatures. This is often found near the center of the cylinder, where the piston maintains the best contact and sealing with the cylinder walls. Additionally, using high-quality materials and maintaining regular maintenance can further reduce wear. Proper break-in procedures during the initial use of an engine also contribute to minimizing wear.
Is the cylinder sleeve nikasil coated on a 1995 yz 250?
The YZ250 cylinder is nikasil coated in the original bore. But, note that the cylinder is all aluminum and does not have a cylinder sleeve as an original part. The original aluminum bore is part of the cast cylinder and is then plated with the nikasil plating. If the cylinder should be damaged by wear or piston seizure, it can be repaired by boring and installing an iron cylinder sleeve. The cylinder sleeve will have the two-stroke ports already machined into the sleeve. Once re-sleeved the cylinder now can be bored to standard size and then to many overize pistons available on the aftermarket. This is a popular method for repairing nikasil plated cylinders economically. A good source for tech info or service is www.lasleeve.com
Can you put a use piston in?
no no no no no, and once again to solidify my point, no! as the engine is used your pistons, and cylinder walls wear in a certain pattern, and they have a different level of wear from car to car, what you have to do generally is send the motor to a machinist to bore the cylinders out slightly, then get new oversized pistons
