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Honing versus boring out blocks?

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Greg

03-11-2000 06:40:22




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Does anyone have experience with using a portable sizing hone to enlarge a wore two-cylinder block for oversize pistons? Also, is this as good a way as having the block bored? Thanks, Greg




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Craig

03-12-2000 20:23:38




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 Re: honing versus boring out blocks? in reply to Greg, 03-11-2000 06:40:22  
There are "rigid hones" and "flexible hones". Rigid hone can resize a cylinder and maintain the roundness required. A flexible hone is used to deglaze cylinders and it will follow what ever contours, out of round, taper or what ever else exists. "Boring" will realign worn cylinders because normally boring will locate off of another flat machined surface of the cylinder block. Seems most of the replies are talking about "flexible" hones.

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Greg

03-13-2000 04:44:34




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 Re: Re: honing versus boring out blocks? in reply to Craig, 03-12-2000 20:23:38  
Do you know some makes and models of rigid hones that could be used to oversize a D block? A sunnen AN-112 claims to have a 7" capacity, but I wonder whether it would be rigid enough when used so close to its limits. Thanks, Greg



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ronm

03-13-2000 06:18:53




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 Re: Re: Re: honing versus boring out blocks? in reply to Greg, 03-13-2000 04:44:34  
Greg, I hope you're not thinking of honing a D block to fit oversize pistons-the first oversize is .045, and I guarantee you will be REAL tired of honing before you get it 5 thou over, much less 45, and the chances of it being true when you got there are iffy. Honing isn't intended to oversize, only to finish the bore or remove glaze, as others have said. It takes a long time to remove any measurable amount of metal. I would suggest you have it bored, just my .O2 like everybody else's.

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Greg

03-14-2000 04:51:28




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 Re: Re: Re: Re: honing versus boring out blocks? in reply to ronm, 03-13-2000 06:18:53  
I think most people when thinking about honing, are really thinking about glaze-breaking. Sunnen specs for their An-112 hone says they can remove .005 " per minute. These are rigid, sizing hones that maintain roundness, and not the cheapie, spring loaded glaze breaker hones. You use roughing stones to remove most of the material, then finishing stones to smooth the bore to proper finish. They use them in some automotive shops to "bore" out car engine blocks, so the same could possibly be used in two-cylinder blocks.

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ronm

03-14-2000 07:18:27




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 Re: Re: Re: Re: Re: honing versus boring out blocks? in reply to Greg, 03-14-2000 04:51:28  
I know what a rigid hone is, & in my opinion it's not a boring machine. It might maintain roundness if roundness exists to begin with, which is doubtful in a worn bore. If you want to take a 7" bore out 45 or 90 thou with a hone, more power to you.



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bbott

03-12-2000 12:52:44




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 Re: honing versus boring out blocks? in reply to Greg, 03-11-2000 06:40:22  
No, honings's not anywhere as good as a full
bore job.

As was stated in another message, the real purpose of honing is to break the 'glazed' surface on the bore and give new piston rings a good surface to seat against.

BUT.. depending on how good of a rebuild you want to do, you can 'cross mike' the bore to see how out of round it is. If it's pretty 'square' in all directions you may be able to get away with what you're doing....

If you're putting any serious quantity of time & $$$ into this engine though, (and sounds like you are) my advice is to go ahead and do it right....

If you just want her to hold together a few more seasons...well, thats different...

It's your call.

bb

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Ernie D

03-12-2000 04:30:26




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 Re: honing versus boring out blocks? in reply to Greg, 03-11-2000 06:40:22  
Honing is done to break the cylinder glaze for ring brak in. It does remove metal, so you need to measure your piston to bore clearance and ovality to make sure you are a candidate. Too great a clearance and you have piston knock/slap.

Boring is what is done when there is too much wear from honing and you need to go to the next size piston.

I understand pistons can be knurled to increase their diameter to fit oversized bores, but I have no first hand experience.

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Knurled pistons..

03-12-2000 09:27:57




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 Re: Re: honing versus boring out blocks? in reply to Ernie D, 03-12-2000 04:30:26  
Ernie:. I had the pistons knurled in an old Ford 332 ci V8 some 20 years ago. The old man at the shop said that it would be maybe 75% as good a complete\total rebuild.. maybe good for some but not for others....that V8 ran just fine then, for what limited work I had to do. harvey



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Charles

03-11-2000 11:25:57




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 Re: honing versus boring out blocks? in reply to Greg, 03-11-2000 06:40:22  
While we're on the subject of honing, when re-ringing a pony motor should I hone the existing sleeves? What grit stones? What about new sleeves? The service manual surprisingly does not even mention honing, but I've never re-ringed a motor without doing it...



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Oaktree

03-11-2000 10:34:05




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 Re: honing versus boring out blocks? in reply to Greg, 03-11-2000 06:40:22  
The problem with honeing vrs boring is that a hone cannot make the hole round it will only enlarge whatever shape the cylinder was. With boreing a round hole is ensured



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Jarrod

03-11-2000 19:47:02




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 Re: Re: honing versus boring out blocks? in reply to Oaktree, 03-11-2000 10:34:05  
I have only honed one block in my days. My dad says he never has. I'm talking in automotive. My two deeres I didn't either. Old Cheverolet books said it was not necessary unless there was scoring or scuffing on the walls. As of now, I am not a believer in honing but i'm sure someone will tell me i'm doing a bad thing and that it doesn't work. But I know it works for me.



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Leger

03-11-2000 20:19:53




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 Re: Re: Re: honing versus boring out blocks? in reply to Jarrod, 03-11-2000 19:47:02  
Honeing insures faster break-in. Presision honeing requires less break-in time,thats why cars today do not require a break-in time. If you ever had a Diesel engine that slobbered after overhaul you would take the time to hone carefully. Gas engines are not so critical- but just as important. Honeing does not replace boreing.



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