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Unread 07-28-2010, 02:13 PM   #1
TannerM
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bore .030 over. whats it mean

When someone says they bored there 302 over .020 or a 289 over .030... What does that mean and what does that entail? The require an engine pull out of a car? Thanks...
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Unread 07-28-2010, 02:21 PM   #2
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yes, the engine has to be out. its when they enlarge a cylinder to restore tolerances and install new pistons to match.
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Unread 07-28-2010, 02:44 PM   #3
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.020 would be twenty thousands of an inch over stock size. .030 would be thirty over. Requires new pistons and rings.
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Unread 07-28-2010, 02:50 PM   #4
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Unread 07-28-2010, 02:57 PM   #5
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Unread 07-28-2010, 03:11 PM   #6
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Unread 07-28-2010, 03:18 PM   #7
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Unread 07-28-2010, 04:24 PM   #8
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One thing that most shops do wrong on the boring process is bore them to size rather than leaving some stock in there for the hone to remove so that the honed cylinder has clean base metal when finished.

For instance, if my finished bore needs to be ready to run at .030 over, then I bore it .026 and hone the other .004 out of it because the boring bar makes a hell of a mess of the cylinder... torn/fragmented metal. (When you look at a cylinder under 40X magnification after a boring bar has had its fun with it, you'd see what I mean.) Under magnification, the cylinder wall surface looks like a Grenade hit it. Simply honing a couple of strokes to put some cross hatch in the bore won't clean all that out and the hone will be very shallow as well thus lending itself to very poor oil retention and hence a very short lived ring with poor ring seal/oil control.
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Unread 07-28-2010, 04:57 PM   #9
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ok shaun T?

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Originally Posted by ShaunT View Post
One thing that most shops do wrong on the boring process is bore them to size rather than leaving some stock in there for the hone to remove so that the honed cylinder has clean base metal when finished.

For instance, if my finished bore needs to be ready to run at .030 over, then I bore it .026 and hone the other .004 out of it because the boring bar makes a hell of a mess of the cylinder... torn/fragmented metal. (When you look at a cylinder under 40X magnification after a boring bar has had its fun with it, you'd see what I mean.) Under magnification, the cylinder wall surface looks like a Grenade hit it. Simply honing a couple of strokes to put some cross hatch in the bore won't clean all that out and the hone will be very shallow as well thus lending itself to very poor oil retention and hence a very short lived ring with poor ring seal/oil control.
he dont know what .030 bore is and your schooling him on honing to exact tolerances? by the way you make a great point when shops bore then hone over spec you end up with piston slap in forged applications,blow by, or a under honed cylinder!
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Unread 07-28-2010, 05:00 PM   #10
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I realize he is super green, but I'm trying to get him to think, among other things. LOL
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Unread 07-28-2010, 05:18 PM   #11
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lol

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I realize he is super green, but I'm trying to get him to think, among other things. LOL
hey remember the good old days before aftermarket blocks were readily available and every one was taking 427s and 454s and filling the water jackets with concrete filler and boring them .100 and even .125 over? haha fast burn out make a pass and shut it down! hey is any one running a block like this now?
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Unread 07-28-2010, 05:25 PM   #12
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Oh I remember like it was yesterday. I also remember well the days when anything you needed for a cylinder head required chopping up a factory head and doing everything to it in the port that you could imagine including welding and epoxy, etc, because aftermarket heads did not exist.
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Unread 07-28-2010, 06:47 PM   #13
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Bore is how wide the cylinder is. Stroke is how deep.

When you bore it, piston gets wider.

When you stroke it, you make the piston travel down further with differant rods, crank.
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Unread 07-28-2010, 09:05 PM   #14
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Thanks all, that answers my questions. Yall are fan f**kin tastic
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Unread 07-29-2010, 07:43 AM   #15
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hey remember the good old days before aftermarket blocks were readily available and every one was taking 427s and 454s and filling the water jackets with concrete filler and boring them .100 and even .125 over? haha fast burn out make a pass and shut it down! hey is any one running a block like this now?
What is wrong with boring a 454 block .100 over?
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Unread 07-29-2010, 04:01 PM   #16
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454?

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What is wrong with boring a 454 block .100 over?
did not say there was anything wrong with it!
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Unread 07-30-2010, 01:48 AM   #17
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You better be sonic testing if you do bore a stock 454 block .100 over.
Other than that, have at it.
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