well I dont know too much about that but it would be nice to run with the 370 with out much to do! So I know there is ways to up it but I though changing it was best if your going to stay NA cuz ive seen a few want to go with FI and a guy has gone nos!

 

id rather have an all motor car than s/c or turbo.

with 11:1 compression, cams, headers, exhaust and appropriate tuning I dont see why we couldnt get 375 HP

Now that would be fun

 

X2. I love the idea of a N/A car thats quick.

 

11:1 is considered stroker territory by most engine builders.

the 350z has a 10.3:1 and the LT1 has a 10.5:1 to put it into perspective.

And to bump compression up to 11:1 isn't as easy as just throwing in taller pistons. The maximum clearance for the stock ones are probably already used, because it has a variable valve timing system.

You would need a crank with a longer stroke, along with shorter conrods and pistons.

 

the 350Z with 306HP has 10.6:1, s2000 2.0 has 11:1, s2000 2.2 has 11.1:1, 370 has 11:1

If we couldnt reach 11:1, id settle for a few points...10:8 is fine by me. Im sure JE could whip something up if we gave them the measurements

 

Nah, you don't want higher compression on a turbo car, more boost will beat a 370 all day long.

 

The 3.8 isn't a turbo car.

I don't think I'd want to go that high even if I were staying NA and in fact I wouldn't mind dropped a half or full point, but I'm going forced induction sooner or later.

 

You don't want higher compression in a boosted car.

 

This is the 3.8 section right?

I really have to change my screen name lol...2.0T is long gone

 

The 3.8 is made for both turbo and S/C they have both in Korea from what my buddy that is stationed tells me

 

Probably easier and cheaper to throw a shot of nitrous on the car quite honestly.

 

well since you are planning to keep it NA higher compression would make it easier to make more power but i know alot of us on here including myslef are planning Forced Induction at some point. personally i plan on getting some 9: 1 compression for when save up for the custom twin turbo set i have planned but until then for a quick fix i do plan on putting a small shot of nitrous probaly something small like a 75 shot considering im still running stock internals but i do plan on a full engine rebuild. but anyways good luck with what u want to do let us know of the power gains and everything if you still decide to do it...

 

stroke has next to nothing to do with compression (assuming tdc is still the same height).

dome on the piston, headgasket thickness/head mill, and head quench area CC in chambers are about the only thing that will make a difference.

 

Well im looking to go turbo in the future when im back in the states hell maybe even port and polish the head and bore out the block! See if I can make an engine that can last cuz the way I can drive over here ill need to build this engine up!

 

I believe the crower boys have a 4.1 stroker kit on the Rhys millen car

 

his compo car or his demo car? Though his competition car has the v8

 

I like the sound of that

 

<div class="pre-quote">
Quote de <strong>drdimick</strong>
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<div class="post-quote">
<div style="font-style:italic">All that is not necessary, they can shape a piston to accomadate valve clearance. There are evo pistons that a 10:1 and those 4G63's have the MIVEC system. Like stated above S2K's run 11:1 and runs Vtec, you do not need a stroker kit in most cases to run that high of compression.</div>
</div>Those engines were designed for that kind of compression from the factory. <br>
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Would you want to chance screwing up your heads because the CCVT wanted to advance cam timing?<br>
<br>
You "could" go with domed pistons, but with how acute the cuts would be to meet valve clearances, you inch closer to predestination and thats promoted more by sharp edges in the chamber (valve reliefs).<br>
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EDIT: predetination* <img src="http://www.GenCoupe.com/images/smilies/tongue.gif" border="0" alt="" title="" class="inlineimg">

Wrong, the Evo 8 has 8.8:1 from the factory. Again I wouldn't worry about the CCVT, because the pistons are going to be designed to allow room for valve clearance and contour combustion chamber. Stroke has nothing to do with it. 11:1 compression is probably not create a sharp enough edge to heat up enough to cause predetonation. I have seen street card with higher compression.

 

Got a guy working on some.

 

As far as i know no one makes pistons you need to go with Copper Head Gaskets and mill the head a little bit. If it has head gaskets and not o-rings. Also the largest over bore may help. Since its a factory kit they may have change the pistons to keep same compression. This will get you closer. To go all the way you will need to make a few changes to the stock internals. The valve timing should have enough room to deal with the thinner head gaskets and Head milling. This is common on engine rebuilds and should clear even with the valve timing fully ramped up.

But how can you handle fuel. More Compression will need more fuel. Other changes besides compression will need to be made. May get away with just a fuel pressure regulator.

 

Just milling down the head or block decks brings its own set of problems.

I haven't really looked into the 3.8 too in depth yet, but some things I've seen in milling down the heads/decks in other engines, is that you add more slack into the timing, be it belt or chain driven, especially if the each bank is single belt/chain driven. In those cases, you would have to use shims on the cam towers or over bore the cam bearing mounts and then use different bearings to correct valve timing. If its just a push rod design link on the domestics then it shouldn't be a problem, but since is it has variable cam timing, I doubt it .

 

Increasing the compression ratio on the GC will probably have to accompany a lower maximum RPM, which would negate any power increases. To increase the CR, you have to either increase the con-rod length or increase the size of the piston heads. Doing either without using lightweight parts will decrease the rev-limit. Light weight parts are a lot more expensive and less tolerant too.

 

You are making this more complicated than it really is. Bumping up the compression a few points is no big deal and will not decrease your rpm limit.

I know plenty of people who have done this in VW's and Hondas.

 

Isn't low compression good for the V6 because then it makes supercharging easier and safer?

 

Thats only assuming that someone wants to go that route.

Not everyone is going to want to boost their engines....some will prefer to go the N/A route..in which power is made by making the engine more efficient (Upping compression, changing stroke..etc.)

 

I don't know just saying wouldn't it be easier to say slap a Vortech supercharger for 5-7k and be making 450-500 horsepower off the bat? I know they just came out with a supercharger for the V8 Auto Camaro that has a low compression ratio and it went from 400horsepower to 600horsepower.

 

You''ll also be dealing with installation, tuning..etc costs as well. so that 5-7k will truly come out to be 9-12k when its all said and done.

a simple piston swap will be much much cheaper than turboing or Sc'ing the car.

the v6 has a displacement of 3.8
The v8 camaro has a displacement of 6.2

The V6 will not make numbers that high with a simple supercharger swap..a SC or Turbo kit will generally add about 90-120 crank HP on stock high compression engines.

 

RMR had custom JE Pistons made for their mid engine project...they bumped compression up in the 4.6 V8 up to 11:1

This is a very simple mod...once you have all the measurements required.

 

They also switched to 8 individual throttle bodies. You'll need supporting mods if you want to reach higher RPMs.

 

RPM isnt what I want, I just wanted increased compression.

 

LOL @ OP
"PLEASE GIVE US THIS 1,500$ MOD TO BE BARELY AS FAST A STOCK CAR THAT COSTS LESS!"
lol. Seriously, high compression pistons aren't going to help, the rods are still weak. You'd need nitrous to make any decent power lol.
You could just get a bottle with a 50 shot and be fine lol.

If you're going to rebuild your engine why not rebuild it compeltely and put F/I on there, or make it a bottle baby V6 (lol fail)

EDIT: Also the heads in the VQ37 flow alot better than these, so it'd be a moot point, the genesis would still have less power and torque.

 

Not everyone wants to go FI...been there, done that. Your "go big or go home" attitude doesnt really make sense.

How do you know the Infiniti heads flow better than a Gen 3.8? Where is the proof. How do you know the rods are weak? This is your opinion, not fact...lets make sure we make that clear.

11:1 compression, I/H/E + tune would be ~350 HP at the crank, thats the range Im looking for.