cylinder distortion

M

mainer

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interesting craig


we still on for tomorrow ? for my dropping off that 24v block/ head??

i'll try and call you in the morning
 
maine04max

maine04max

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yes we are i will probably be at heaths so if u want you can drop it off there to cut down on travel time
 
KEVINL

KEVINL

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I don't think so if you were able to do that with your hand the bores would be ovals
 
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bonescarolfi

bonescarolfi

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I actually did something like that on my first day at tech school with cylinder sleeves out of semi engines. The teacher put the gauge in and had everybody push on the sleeve to see how little pressure was needed to distort the sleeve enough to make the gauge fall out. Didn't take much.
 
Jared Duramax

Jared Duramax

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bonescarolfi said:
I actually did something like that on my first day at tech school with cylinder sleeves out of semi engines. The teacher put the gauge in and had everybody push on the sleeve to see how little pressure was needed to distort the sleeve enough to make the gauge fall out. Didn't take much.
Click to expand...

we did something similar to this the other day. and it will amaze you how much these engines move and why torque honing is good.
 
McRat

McRat

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Cool demonstration, but everything bends. Everything...

Back when the laser was first coming out (~1970, I was in grade school), I went to a demonstration at General Dynamics. They had a 12"x12"x12" cube of glass. Solid. They shined a laser through it. Then the scientist rested his index finger on it, and it showed the distortion going in about 1/2 way through the block. Sure it was less than a millionth of an inch, but it bent. My machines at work are 10" thick solid granite and they distort a few ten-thousandths when loaded.

Now as far a deck honing goes, it's a good idea. But no stress they can put on the deck plate is going to match the cylinder pressure itself. Cylinders will always change shape under load, or you would not need pistons rings. Ever see a Cox model airplane engine? High compression yet they have no rings. The bore is so small and so accurate, that the piston seals very well without rings.

Back to the demostration, I think a dial indicator would actually make a useful demonstration.
 
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JoshH

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McRat said:
Cool demonstration, but everything bends. Everything...

Back when the laser was first coming out (~1970, I was in grade school), I went to a demonstration at General Dynamics. They had a 12"x12"x12" cube of glass. Solid. They shined a laser through it. Then the scientist rested his index finger on it, and it showed the distortion going in about 1/2 way through the block. Sure it was less than a millionth of an inch, but it bent. My machines at work are 10" thick solid granite and they distort a few ten-thousandths when loaded.

Now as far a deck honing goes, it's a good idea. But no stress they can put on the deck plate is going to match the cylinder pressure itself. Cylinders will always change shape under load, or you would not need pistons rings. Ever see a Cox model airplane engine? High compression yet they have no rings. The bore is so small and so accurate, that the piston seals very well without rings.

Back to the demostration, I think a dial indicator would actually make a useful demonstration.
Click to expand...

So you don't think deck plate honing will help prevent distortion of the cylinder when the head is bolted on?
 
WolfLMM

WolfLMM

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Nov 21, 2006
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McRat said:
Cool demonstration, but everything bends. Everything...

Back when the laser was first coming out (~1970, I was in grade school), I went to a demonstration at General Dynamics. They had a 12"x12"x12" cube of glass. Solid. They shined a laser through it. Then the scientist rested his index finger on it, and it showed the distortion going in about 1/2 way through the block. Sure it was less than a millionth of an inch, but it bent. My machines at work are 10" thick solid granite and they distort a few ten-thousandths when loaded.

Now as far a deck honing goes, it's a good idea. But no stress they can put on the deck plate is going to match the cylinder pressure itself. Cylinders will always change shape under load, or you would not need pistons rings. Ever see a Cox model airplane engine? High compression yet they have no rings. The bore is so small and so accurate, that the piston seals very well without rings.

Back to the demostration, I think a dial indicator would actually make a useful demonstration.
Click to expand...

Want to know something more interesting? You prolly already know this though:eek:. His finger never touched the glass. Repulsive Force! Just like the cylinders never touch the piston or rings.
 
WolfLMM

WolfLMM

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