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Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 5:53 am
by Warp Speed
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.
Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 5:56 am
by Warp Speed
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
Posted: Mon May 14, 2018 6:57 am
by gmrocket
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
Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 7:11 am
by gunt
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 ,
Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 7:17 am
by Warp Speed
.....
Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 7:18 am
by Warp Speed
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Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 7:19 am
by Warp Speed
Sorry, damn phone! Lol
Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 7:24 am
by user-30257
Warp Speed wrote: ↑Mon May 14, 2018 7:19 am
Sorry, damn phone! Lol
Sure.....
Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 7:33 am
by Warp Speed
Headguy wrote: ↑Mon May 14, 2018 7:24 am
Warp Speed wrote: ↑Mon May 14, 2018 7:19 am
Sorry, damn phone! Lol
Sure.....
Maybe the tard operating it too...........! Hahaha
Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 8:24 am
by MotionMachine
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?
Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 9:58 am
by 1972ho
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.
Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 10:57 am
by Walter R. Malik
JodyB wrote: ↑Sun May 13, 2018 7:21 pm
Put the tighter pistons close to the water pump, loose ones farthest away. Run it.
That is backwards ... a colder running cylinder wall will want more initial clearance.
Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 5:01 pm
by gmrocket
MotionMachine 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?
That's why you torque it against your finger and use a mic stand
crazy but I was told this when I was a student at 14 when I worked in a machine shop...in the 70's
Re: Engine machine shop destroyed my block
Posted: Mon May 14, 2018 5:04 pm
by gmrocket
1972ho wrote: ↑Mon May 14, 2018 9:58 am
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.
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
Posted: Mon May 14, 2018 5:10 pm
by Zmechanic
1972ho wrote: ↑Mon May 14, 2018 9:58 am
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.
Lol, did you add another zero again? Just remember, in fractional decimal representation, there's one less zero! 1 thousand = 1000 -> 3 zeros. 1 thousand
th = 0.001 -> 2 zeros.
Or I suppose you could say one of the three zeros lives on left side of the decimal...
