Borrr-ing... - Tilted Forum Project Discussion Community

Snakeyes · 07-02-2003, 08:30 AM

This question has always plagued me: What is the process of boring out a cylinder?

People ask me and I have never known the answer, and I can't even think of any b.s. response to give them.

So how does it go?

Spyder_Venom · 07-02-2003, 10:35 AM

You literally (lets take a SBC) has a 4.00" bore (the diameter of the hole the piston sits in) you take that and bore it X. This is commonly refered to as say .030 (thirty over) and means that the once 4.000" bore is now 4.030 in diameter. This would require you to get pistons of the same size. Hope that helps a little LOL

big_bubba · 07-02-2003, 10:56 AM

Not the kind of thing you can do yourself. Take it to a local machine shop.

Snakeyes · 07-02-2003, 12:18 PM

Quote:

What is the process of boring out a cylinder?

merkerguitars · 07-02-2003, 04:53 PM

Look at spyder venoms answer he explains it quite nicely

Hmmrmm..nevermind...how they do it, is with machining tools..........

stingc · 07-02-2003, 07:22 PM

More or less a big rotating sander/blade type thing that's inserted into the cylinder.

Ashton · 07-03-2003, 02:45 AM

Teh cylinders in teh engine are bored out to except teh bigger pistons......

/and shit

Snakeyes · 07-03-2003, 09:50 AM

How wretchedly unhelpful ashton

thanks stingc for the only comprehensible reply

Ashton · 07-03-2003, 12:32 PM

LOL! what's so 'unhelpful' about it? look at the pic....

Snakeyes · 07-03-2003, 12:33 PM

okay perhaps i was unclear

i didnt ask what boring IS, I asked HOW it's done.

Ashton · 07-03-2003, 12:44 PM

Teh cylinder is bored out to except a larger piston..... plain and simple.

Snakeyes · 07-03-2003, 03:06 PM

Well I was shooting for a little more in depth than

"Boring a cylinder is performed by boring the cylinder"

But your last picture helped as to what machine does it.

0001 · 07-03-2003, 11:34 PM

This is the part where you use your head and stop asking questions

Ashton · 07-04-2003, 12:04 AM

Egad! How can I make it more plain? The engine is stripped down to the bare block, then it is placed in the cylinder boring machine and each cylinder is bored out about 30 thousands a inch..... then each cylinder is honed with a cylinder hone until there is a nice crosshatching on each cylinder...... then the engine is decked so that the heads will fit perfectly flat with the block..... THEN the block is washed out to get rid of any metal scraps, after all that the block is reassembled with new bearings,
and new pistons that are 30 thousands of a inch larger than the original cylinder bore.....

So...... Teh cylinders in teh engine are bored out to except larger pistons......

/And Shit.......

Snakeyes · 07-04-2003, 11:00 AM

Ashton, thanks a lot for the last post.

I hope you now realize the difference between stating the obvious and explaning.

Compare your final post to your first post. THATS how you can make it more plain.

Atomic Pinkie · 07-07-2003, 02:14 AM

so that little tiny amount of change adds a bunch of displacement?

stingc · 07-07-2003, 07:30 AM

No, boring is sometimes done to increase displacement, but the 0.030 over example is used when rebuilding certain engines. You cut out all the old imperfections in the cylinder wall, so its like starting with a new block.

Snakeyes · 07-07-2003, 07:00 PM

Also, pinkie, yes it does.

Swept Volume = [2 x Area Piston (in2) - Area Rod (in2) ] * Stroke (in)

Also much less confusingly, Bore x Bore x Stroke x .7854 x # cylinders

A V8 405 ci engine ( 4" x 4") "30 over" becomes a 411.42 ci engine.

xenollama · 07-11-2003, 11:20 AM

Then you get some of the crazy VW people who are boring VR6s out from 2.8L as high as 3.1L

Supposedly they are taking a full tenth of an inch out to go that high.

07-02-2003, 08:30 AM	#1 (permalink)
Snakeyes Loser Location: Toronto	Borrr-ing... This question has always plagued me: What is the process of boring out a cylinder? People ask me and I have never known the answer, and I can't even think of any b.s. response to give them. So how does it go?

07-02-2003, 10:35 AM	#2 (permalink)
Spyder_Venom Psycho Location: MN	You literally (lets take a SBC) has a 4.00" bore (the diameter of the hole the piston sits in) you take that and bore it X. This is commonly refered to as say .030 (thirty over) and means that the once 4.000" bore is now 4.030 in diameter. This would require you to get pistons of the same size. Hope that helps a little LOL __________________ The local track whore

07-02-2003, 04:53 PM	#5 (permalink)
merkerguitars Buffering......... Location: Wisconsin...	Look at spyder venoms answer he explains it quite nicely Hmmrmm..nevermind...how they do it, is with machining tools.......... __________________ Donate now! Ask me How! Please use the search function it is your friend. Look at my mustang please feel free to comment! http://www.tfproject.org/tfp/showthread.php?t=26985 Last edited by merkerguitars; 07-02-2003 at 05:13 PM..

07-07-2003, 02:14 AM	#16 (permalink)
Atomic Pinkie Addict Location: Chicago	so that little tiny amount of change adds a bunch of displacement? __________________ Where dem bitches at?

07-02-2003, 10:56 AM	#3 (permalink)
big_bubba Psycho	Not the kind of thing you can do yourself. Take it to a local machine shop.

07-02-2003, 07:22 PM	#6 (permalink)
stingc Psycho Location: PA	More or less a big rotating sander/blade type thing that's inserted into the cylinder.

07-03-2003, 02:45 AM	#7 (permalink)
Ashton PORNHOUND Location: California	Teh cylinders in teh engine are bored out to except teh bigger pistons...... /and shit

07-03-2003, 09:50 AM	#8 (permalink)
Snakeyes Loser Location: Toronto	How wretchedly unhelpful ashton thanks stingc for the only comprehensible reply

07-03-2003, 12:32 PM	#9 (permalink)
Ashton PORNHOUND Location: California	LOL! what's so 'unhelpful' about it? look at the pic....

07-03-2003, 12:33 PM	#10 (permalink)
Snakeyes Loser Location: Toronto	okay perhaps i was unclear i didnt ask what boring IS, I asked HOW it's done.

07-03-2003, 12:44 PM	#11 (permalink)
Ashton PORNHOUND Location: California	Teh cylinder is bored out to except a larger piston..... plain and simple.

07-03-2003, 03:06 PM	#12 (permalink)
Snakeyes Loser Location: Toronto	Well I was shooting for a little more in depth than "Boring a cylinder is performed by boring the cylinder" But your last picture helped as to what machine does it.

07-03-2003, 11:34 PM	#13 (permalink)
0001 Crazy Location: Canadeh!	This is the part where you use your head and stop asking questions

07-04-2003, 12:04 AM	#14 (permalink)
Ashton PORNHOUND Location: California	Egad! How can I make it more plain? The engine is stripped down to the bare block, then it is placed in the cylinder boring machine and each cylinder is bored out about 30 thousands a inch..... then each cylinder is honed with a cylinder hone until there is a nice crosshatching on each cylinder...... then the engine is decked so that the heads will fit perfectly flat with the block..... THEN the block is washed out to get rid of any metal scraps, after all that the block is reassembled with new bearings, and new pistons that are 30 thousands of a inch larger than the original cylinder bore..... So...... Teh cylinders in teh engine are bored out to except larger pistons...... /And Shit.......

07-04-2003, 11:00 AM	#15 (permalink)
Snakeyes Loser Location: Toronto	Ashton, thanks a lot for the last post. I hope you now realize the difference between stating the obvious and explaning. Compare your final post to your first post. THATS how you can make it more plain.

07-07-2003, 07:30 AM	#17 (permalink)
stingc Psycho Location: PA	No, boring is sometimes done to increase displacement, but the 0.030 over example is used when rebuilding certain engines. You cut out all the old imperfections in the cylinder wall, so its like starting with a new block.

07-07-2003, 07:00 PM	#18 (permalink)
Snakeyes Loser Location: Toronto	Also, pinkie, yes it does. Swept Volume = [2 x Area Piston (in2) - Area Rod (in2) ] * Stroke (in) Also much less confusingly, Bore x Bore x Stroke x .7854 x # cylinders A V8 405 ci engine ( 4" x 4") "30 over" becomes a 411.42 ci engine.

07-11-2003, 11:20 AM	#19 (permalink)
xenollama Upright	Then you get some of the crazy VW people who are boring VR6s out from 2.8L as high as 3.1L Supposedly they are taking a full tenth of an inch out to go that high.