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Bad Hone or out of round?
Topic Started: Dec 4 2011, 12:43 PM (1,323 Views)
musquoni
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Hello everyone. I got my G10 block back from the machine shop and just noticed that the hone isn't uniform. It seems like he missed some areas on the cylinder wall. Also all of the cylinders have an edge on the top where the hone did get. When I pulled everything apart before taking it in i ran my fingers across the wall and everything felt smooth with no edge on top. My questions are: Is this because of the hone or could the cylinders be out of round? If it is out of round could i get by with another hone or would i have to have the cylinders oversized? Here are some pics to help answer my questions. Thanks.
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Edited by musquoni, Dec 4 2011, 12:50 PM.
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91 ragtop
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Was that engine overheated ?

Ken.....
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Scoobs
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:D

the machine shop shoulda told you that somthing was wrong, assuming something is, otherwised the hone would be nice and clean.
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Memphis metro


If for no reason at all and nothing else but to ease my mind since you got it to this point I would have it bored oversize and go oversize pistons and rings and be done with it.

Welcome to the forum.
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Old Man


enginedoctorgeo
Dec 4 2011, 01:00 PM
If for no reason at all and nothing else but to ease my mind since you got it to this point I would have it bored oversize and go oversize pistons and rings and be done with it.

Welcome to the forum.
and I would take it to a different machine shop--that guy did a lousy job
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bogs
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Duct tape heals all wounds

That guy did do a lousy job, and I'm surprised he let it leave his shop looking like that. I would ask him what he plans to do to make it right with you before doing anything else, was this a professional ?
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musquoni
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It was burning oil when i purchased the car so i decided to rebuild. I'm not sure if it overheated. This guy owns a shop with all the equipment, he is a one man shop and as much as i like supporting small shops(I own a one man sign shop) Its ones like this that make it hard for me to choose a small shop vs a larger more professional one. Also if i bore it out and oversize will it affect my fuel economy?
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Scoobs
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:D

Mpg effect... Minimal, probably not very noticable, but it will give you a tad more power tho. i can feel a major power increase from my 105k mile stimpy, and my ~200 mile engine in gercedez, with a 75mm bore, and balanced rods and pistons.
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musquoni
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If i over size it would i have to adjust anything like the throttle or carb for fuel consumption?
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Old Man


before I would take it into a shop and say "overbore it" I would ask them to hone it till it clears up and THEN take measurements to determine if it actually NEEDS to be over bored...........
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Scoobs
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:D

getting bored, and just get oversize pistons and rings, you dont need to mod anything else, just new pistons and rings.
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Coche Blanco
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Troll Certified

Power/MPG difference between 74mm and 75 is super duper duper negligible.
Edited by Coche Blanco, Dec 4 2011, 10:26 PM.
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Scoobs
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:D

yea, but you notice a difference in my situation, a 105k original mile motor- poorly maintained. vs a fresh rebuild :D
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Old Man
Dec 4 2011, 01:28 PM
enginedoctorgeo
Dec 4 2011, 01:00 PM
If for no reason at all and nothing else but to ease my mind since you got it to this point I would have it bored oversize and go oversize pistons and rings and be done with it.

Welcome to the forum.
and I would take it to a different machine shop--that guy did a lousy job
:gp Plus what Bogs said.
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bogs
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Duct tape heals all wounds

Being a small one man shop is no reason to see a job like that, I've been a small one man shop, and have done business with many small one man shops myself.

Plenty of small one man shops are run by thorough going professionals and / or people who will go out of their way to make something right if they can.

I don't know the guy you originally took this to, but I would give him the benefit of the doubt and ask him to correct it first, it is obviously botched, and it is just as obvious he is the one that botched it.

However, if he looks at that job, and asks you with a straight face "whats wrong with that?" that will tell you everything you need to know about his level of workmanship and expertise and you can proceed to take your business elsewhere since you could have done a better job than that with a hone and a drill.
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