What's the difference between bored and stroked??
 

From my understanding stroking an engine is increasing its displacment right? What is boring an engine? Is it just taking layers from the pistons, or increasing the space between the piston and the walls inside the block?

<small>[ September 13, 2002, 06:44 AM: Message edited by: LSs1Power ]</small>

Re: What's the difference between bored and stroked??
 

no difference. they are the same thing.

<img border="0" alt="[devil]" title="" src="graemlins/gr_devil.gif" />

Re: What's the difference between bored and stroked??
 

Well when you think about a cylinder, it has a bore (diameter of the hole) and stroke (how far up and down the piston moves).

"Boring" an engine means increasing the diameter of the cylinder "hole" and fitting it with a larger diameter piston.

"Stroking" an engine means getting a crank that moves the piston further up and down in the cylinder.

Either is a way of increasing displacement.

Re: What's the difference between bored and stroked??
 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by squirrels:
<strong>Well when you think about a cylinder, it has a bore (diameter of the hole) and stroke (how far up and down the piston moves).

"Boring" an engine means increasing the diameter of the cylinder "hole" and fitting it with a larger diameter piston.

"Stroking" an engine means getting a crank that moves the piston further up and down in the cylinder.

Either is a way of increasing displacement.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Thanks alot. I have one last question, what does milled the heads means??

Re: What's the difference between bored and stroked??
 

It means that the heads have been machined down on the flat side where the head gasket is. This will shrink your combustion chamber and increase your compression. It is also done to correct warped heads.

Re: What's the difference between bored and stroked??
 

So if i bored my block and got me larger pistons with stronger Rods and all the parts needed, i dont need a crank right? I just need a new cranck if i want to stroke motor right
? If thats true then boring an engine is way cheaper right? That if i want my engine to be 396 instead of 346.

Re: What's the difference between bored and stroked??
 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by LSs1Power:
<strong>So if i bored my block and got me larger pistons with stronger Rods and all the parts needed, i dont need a crank right? I just need a new cranck if i want to stroke motor right
? If thats true then boring an engine is way cheaper right? That if i want my engine to be 396 instead of 346.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yes you are correct, you can use your stock crank. Be sure you have it balanced before putting it back in...

josh

Re: What's the difference between bored and stroked??
 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Damian:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by LSs1Power:
<strong>So if i bored my block and got me larger pistons with stronger Rods and all the parts needed, i dont need a crank right? I just need a new cranck if i want to stroke motor right
? If thats true then boring an engine is way cheaper right? That if i want my engine to be 396 instead of 346.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yes you are correct, you can use your stock crank. Be sure you have it balanced before putting it back in...

josh</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">If stroked gave me 396 and bored gave me 396, which one will produce more power and which one is better?

Re: What's the difference between bored and stroked??
 

[/qb][/QUOTE]If stroked gave me 396 and bored gave me 396, which one will produce more power and which one is better?[/QB][/QUOTE]

It's kinda like asking if a very tall blond or a medium height brunette is better...it depends on what you are looking for.

To pick up 50 cubes by JUST boring or JUST stroking would be difficult. You'd have to bore .270 inch with stock stroke, or stroke .528 inch with stock bore. Either method would be difficult to fit in the block and be very costly.

Increasing bore size often allows larger valves to flow better due to less restriction by the cylinder walls. Using the stock stroke could allow more rpm than using a much longer stroke.

Realistically, to pick up 50 cubes, bore and stroke the engine. There are some bore/stroke/rod length parameters that affect engine performance.

LSs1Power, you were just looking for basic info, right?

Re: What's the difference between bored and stroked??
 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by LSs1Power:
<strong>So if i bored my block and got me larger pistons with stronger Rods and all the parts needed, i dont need a crank right? I just need a new cranck if i want to stroke motor right
? If thats true then boring an engine is way cheaper right? That if i want my engine to be 396 instead of 346.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Well on a LS1 you need to get a resleeved block to increase the bore on a LS1, so it's cheaper but not by much. BTW a 387 is about as far as you can go by just boring.

As for the bored vs stroked displacement increase
For example a old small block chevy can get to 377 cubes two ways. One is a 350 with 4" bore and 3.75" stroke(400 SBC), the other is a 400 with a 4.155" bore (.030 over) and a 3.48 stroke (350SBC). Today you can build these all else being equal pretty easy. So which one is better?

Well the large bore engine will breathe better, run a longer rod easier, run higher rpm easier since it has less piston speed due to the shorter stroke and will probably have a lighter rotating assembly. So all those advantages will add up to a stronger engine.

So you can get a 383-387 from a LS1 two ways. One is stroked with a lunati stroker crank and rods and pistons, or with a Re-Sleeved block, new pistons and new rods. You can also run Bigger Valve heads (w/ the larger bore setup) and that will help flow and create hp.

Bret

Re: What's the difference between bored and stroked??
 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Old SStroker:
<strong>[/qb]</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">LSs1Power, you were just looking for basic info, right?</strong>[/QUOTE]

Yeah i wanted to learn more about stroking and boring an engine because i think i'm going into this direction before i go FI.

Thanks alot guys.