This puzzles me about forged pistons
Discussion
delcbr said:
If I have an engine with cylinder bores of 86mm and I decide I want to fit forged pistons surely I should have the block bored to 86.25mm and have 86.25mm forged pistons.
Why would someone want to fit 86.00mm forged pistons to a block that’s already been in use?
You could hone the block and have an under 86 mm piston if you want to save weight and preserve the block. Why would someone want to fit 86.00mm forged pistons to a block that’s already been in use?
Ahbefive said:
An 86mm piston won't freely slide inside an 86mm cylinder. Although 1/4 of a mm may be too much tolerance, perhaps the ring makes up the difference.
they will give you pistons to suit a 86 mm bore, not a piston that is 86 mm diameter. this means the pistons would be 85.9x so it has the right clearance to a 86 mm boredelcbr said:
My pistons are 86.02mm block is honed to 86.10mm these are factory sizes.
This is why it puzzles me that piston manufacturers sell 86.00mm pistons.
different pistons expand a different amounts and different applications require different clearance. its not clear if you are talking OE or aftermarketThis is why it puzzles me that piston manufacturers sell 86.00mm pistons.
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