Engine machine shop destroyed my block
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Re: Engine machine shop destroyed my block
Kind of off subject, but relative. How do.you measure a 200* cylinder wall with any accuracy?
That was the big problem we faced back in the hot honing craze days! Lol
Not saying there might not be something to it, but the challenges are real foe sure.
That was the big problem we faced back in the hot honing craze days! Lol
Not saying there might not be something to it, but the challenges are real foe sure.
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Re: Engine machine shop destroyed my block
Warp Speed wrote: ↑Mon May 14, 2018 5:53 am Kind of off subject, but relative. How do.you measure a 200* cylinder wall with any accuracy?
That was the big problem we faced back in the hot honing craze days! Lol
Not saying there might not be something to it, but the challenges are real for sure.
Re: Engine machine shop destroyed my block
Was it actually hot honed as in sealed with heated liquid circulating through it or just the tq plate?
On that small of a bore it's more critical to be on the money than if its a larger bore , like in the 4.250" range.. being .001" over spec you can get away with
On that small of a bore it's more critical to be on the money than if its a larger bore , like in the 4.250" range.. being .001" over spec you can get away with
Re: Engine machine shop destroyed my block
I'M probably wrong or missed it
is the clearance not different for hot v cold hone as in heated water in the water jacket , and therefore the clearance given on the box would be for the average machinist who is doing it for the average punter on cold hone and this too is a factor ,
is the clearance not different for hot v cold hone as in heated water in the water jacket , and therefore the clearance given on the box would be for the average machinist who is doing it for the average punter on cold hone and this too is a factor ,
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Re: Engine machine shop destroyed my block
Maybe the tard operating it too...........! Hahaha
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Re: Engine machine shop destroyed my block
I always question someone setting their Mitutoyo or other bore gages with a mic. It's completely operator sensitive for one and how accurate is that mic? If the thread adjustment is loose (mic has backlash), it may measure right on with a standard as the backlash is taken out when the standard is snug between the spindle and the anvil. But if it's just screwed out to 4.280" and locked, is it exactly to size with backlash not removed?
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Re: Engine machine shop destroyed my block
Now you all have me really curious as to bore clearances, will a bore that is .0004 or .0007 really cause an engine any real hp problems or sealing and wear problems.
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Re: Engine machine shop destroyed my block
That is backwards ... a colder running cylinder wall will want more initial clearance.
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Re: Engine machine shop destroyed my block
That's why you torque it against your finger and use a mic standMotionMachine wrote: ↑Mon May 14, 2018 8:24 am I always question someone setting their Mitutoyo or other bore gages with a mic. It's completely operator sensitive for one and how accurate is that mic? If the thread adjustment is loose (mic has backlash), it may measure right on with a standard as the backlash is taken out when the standard is snug between the spindle and the anvil. But if it's just screwed out to 4.280" and locked, is it exactly to size with backlash not removed?
crazy but I was told this when I was a student at 14 when I worked in a machine shop...in the 70's
Last edited by gmrocket on Mon May 14, 2018 5:29 pm, edited 2 times in total.
Re: Engine machine shop destroyed my block
Maybe not, but his was more than twice that extra...which is more critical on very small bores like he is dealing with.
Re: Engine machine shop destroyed my block
Lol, did you add another zero again? Just remember, in fractional decimal representation, there's one less zero! 1 thousand = 1000 -> 3 zeros. 1 thousandth = 0.001 -> 2 zeros.
Or I suppose you could say one of the three zeros lives on left side of the decimal...