Is it true if you add a lot of performance mods its a good idea to bore ur engine's cylinders. So more air and fuel could get in there without the engine messing up?

hahahahaha, i thought this thread was about under 2L motors :lol:
but on topic boring out an engine is alot of work and new pistons could get expensive

But u need to do it so the engine won't get messed up right, cause all the forced induction mods

you don't NEED to do it, but its a good idea, and you get much more litreage for your engine. Also, its better with an Aluminium V6, there is more space to bore, so the cylinders can still have a thicker wall lining. I was talking with a friend yesterday who wants to bore out a Tickford V6 to about 4.5 - 5 liters, and stick it in the back of an old MINI Pickup!! Oh, and possibly add a supercharger or turbo! but then, he's crazy, he also races a Porsche 911GT3R in the BGT series! - mad man!

Changing your bore is difficult, you might wanna change your stroke instead. Anyway, it's only needed when you super/turbocharge.

If your doing it for the sole purpose of lowering the compression ratio to add a turbo or something, you don't need to bore out the block.... You can just buy pistons that have a lower compression ratio....

I think Ross hase a pretty good selection......

You won't gain much in HP...you would gain more in torque. Thats a very general statment, but it seems to be mostly true....

If your doing it for the sole purpose of lowering the compression ratio to add a turbo or something, you don't need to bore out the block.... You can just buy pistons that have a lower compression ratio....

I think Ross hase a pretty good selection......

You won't gain much in HP...you would gain more in torque. Thats a very general statment, but it seems to be mostly true....

Do u mean like if u have a 300hp engine to lower it to 280 then add a turbo? If so how would u do that.

If your doing it for the sole purpose of lowering the compression ratio to add a turbo or something, you don't need to bore out the block.... You can just buy pistons that have a lower compression ratio....

I think Ross hase a pretty good selection......

You won't gain much in HP...you would gain more in torque. Thats a very general statment, but it seems to be mostly true....

Do u mean like if u have a 300hp engine to lower it to 280 then add a turbo? If so how would u do that.

No.. Say you have a s2000 and you want to add a turbo... you run a risk of blowing up your investment because the compression on those little gems is very high.. I don't know exactly what it is but we will use 10:1 as an example... IN GENERAL, thats too high for a turbo application...

So you yank the engine and find a lower compression piston say for 8:1 or 8.5:1 and now you can add a turbo... There are a couple of different way to lower your compression ratio, but I think the most accepted as being the "correct"way to do it is by changing the pistons....

Like I said there are a couple of different ways though... thicker head gasket is another way...

Explain this compression ratio, I never did understand it :( .

The S2000 has 11:1.

Compression ratio is the empty volume of the cylinder when the piston is at the lowest point divided by the empty volume of the cylinder when the piston is at the highest point.
A typical value for NA engines is 10:1. Some high revving engines have about 11:1, some direct injection engines have even 12:1, and turbocharged engines have about 8-8.5:1.

The S2000 has 11:1.

Compression ratio is the empty volume of the cylinder when the piston is at the lowest point divided by the empty volume of the cylinder when the piston is at the highest point.
A typical value for NA engines is 10:1. Some high revving engines have about 11:1, some direct injection engines have even 12:1, and turbocharged engines have about 8-8.5:1.

Thanks.... I didn't know it was 11:1

Dam thats high... :shock:

Well, high-revving engines like the S2000 or the Type-R usually have high compression.
(I still haven't figured out why, if anyone knows I would be grateful). :D

You dont need to do anything to your engine. it seems that youre not very knowedgeable about cars and prolly dont drive well enough to have more than 50hp. so leave it alone and get a ford festiva.
"what's a comression ratio?"...hahahahaha

Wow, you call him stupid, but you can't even read the dates and realize this thread is over a year old. Hmm, and you don't know that the whole point of a forum is to learn and spread your personal knowledge to others. Great first impression :cool:

Mods lock this

You dont need to do anything to your engine. it seems that youre not very knowedgeable about cars and prolly dont drive well enough to have more than 50hp. so leave it alone and get a ford festiva.
"what's a comression ratio?"...hahahahaha

Yeah, Well I bet you drive an electric scooter, so go to another forum.

Scootertalk.com perhaps?

^^ rofl good one
this is an interesting topic though, im glad it was bumped, forced me to look further into some of it, very interesting

You dont need to do anything to your engine. it seems that youre not very knowedgeable about cars and prolly dont drive well enough to have more than 50hp. so leave it alone and get a ford festiva.
"what's a comression ratio?"...hahahahaha

What, may I ask, do you gain by registering to this site for the sole purpose of putting down another member? Puzzles me...not everyone has to be a whiz in the technical aspects of cars to fully appreciate them.

[shadow_FIX]

He's an arsehole but come on, take it like a man.

boring is done to compensate for wear in an engine.when engine is rebuilt new piston rings wont seat on a used cylinder wall.some engine blocks are made of a harder(higher quality iron-nickel alloy) than others.old vw rabbits could be honed and reringed.usually engines are bored just to next piston oversize available for the engine .most engine blocks can be rebored 2 or 3 times.if you try to overbore too far cylider wall will be too thin.some aluminum blocks have steel sleeves that can be removed and new sleeves can be installed.most of the time the only way to safely get a major increase in cubic inches with a big bore is using an aftermarkit block.usually only applies to chevy or ford or the new aftermarkit honda b engines.