Head Job, what do i do to make this More powerful Options

[celicasupra209]

alright i still have questions with the other post but since i dont know the answer to the question in which i have yet.

what do you guys recommend me doing to increase my hp/trq while my engine is dismantle at this point. keep in mind i gotta still meet california smog rules. i heard that i can bore out my block for larger pistons and as long as i dont touch the crans ill be okay with the carb rules, i guess i could look into carb legal crans too. just want to know what kinda of things are i can go to guys

[KAMiX]

If you're not going to put a turbo on there probably don't need stronger pistons but you could up the compression a bit by boring it out. Best bet to start would probably be getting head worked on, polish out all the burrs & increase the port sizes. Maybe get some valve work done like new springs etc. Could get some work done to the throttle body or get a bigger one. Basic breathing mods really.

[Junior]

[KAMiX]

If you get bigger pistons to match it will. Kind of expensive though he's prob better off just getting the head machined &/or new head gasket.

[Hanyo]

increasing the displacement (aka bore/stroke) will make you fail california smog..

[Junior]

[KAMiX]

Actually, YOU need to do some research. Don't mean to be rude but you are wrong Junior.

Compression is based on the size of the combustion chamber with the piston at the bottom of it's cycle (Max chamber size) vs size of the chamber with the piston at the top of it's cycle (min chamber size).

So if you increase the bore & keep the min chamber size the same with bigger pistons, you will increase your compression. You are right in that you can also just change the shape of your piston heads to only reduce the min size of the chamber, but that is not the only way to do it.

Heres a good link that shows you how to calculate ur compression ratio. http://e30m3performance.com/myths/more_myt.../comp_ratio.htm

[Junior]

Learn to do some math. When you bore it out, the combustion chamber is bigger at the top and bottom of the cycle, not just the bottom of the cycle.

[celicasupra209]

well my future ideas is possible Supercharge from rippion and modifiying my hood (gt4) to fit the supercharger .. so what would i need to make it strong enuff to handle that kind of power guys.. bore/stroke is a diffinete yes. does anyone know how much our stock piston/rods/crans can handle? hp wise that is and i looked up stuff but cant find any pistons and so on to fix my car up.. what the heck! lolz im also looking into a clutch kit.

[Silver94CelicaOw...]

If you planned on getting the Ripp Mods Supercharger for the 5SFE, your stock engine internals would be fine. Getting a heavier duty clutch would be a good idea to handle the extra power, but supercharging wont immediately require any extra internal work, unless somewhere down the road you have the money to get forged pistons and rods, along with new valves and valve seals.

But thats only really neccesary if you plan on turniing up the boost significantly. Staying on top of engine maintainence and not running lean is your best prevention against things going wrong. This, to the best of my knowledge, will set you on the right path to keep your engine running reliably.

EDIT- Increasing the bore and stroke will not in any way strengthen the engine. Your crank has plenty of strenth to deal with boost at least to a humane level, however getting stronger and lower compression pistons and forged rods would probably be a wise upgrade when dealing with lots of boost, along with new or aftermarket valve springs and seals.

This post has been edited by Silver94CelicaOwner: Jun 23, 2004 - 8:58 PM

[celicasupra209]

wow thanks guys for the 411. Now i just gotta go find a place to hook me up with some stuff! i was also researching the carb stuff about internals changes..

"Replacement internal engine parts, such as pistons, rods, or the crank, must be designed to factory specifications. Oversize parts can be used as long as they are within factory tolerances for replacement engine parts. Any part not built within factory specifications requires an Executive Order to be legal for street use"

so lets see if i plan in supercharging it with possible higher boost the what Ripp mods are stating i should beef up my internals. I guess im going to bore/stroke out my internals and if my funds are enuff get some new forged piston, etc.

does port polishing help any? at all?

[celicasupra209]

Where can i find some kits i can purchase to save money buying individually?

[celicasupra209]

what would you guys recommend me purchasing, for to build the bottom end for future supercharging? (ie: je pistons over hp pistons). My uncle recommended only going 30 over bore?

im trying to buy materials to install on my now dismantel engine.

Also does lowering my compression affect the power output, such as losing hi-end trq and so on.

DAMN I HATE BEING A NOOB.

wish i could just put a program in my brian like "matrix" and have all the knowledge..

[SlowCelica94]

Wow, when I about to read this thread I really thought it would end in, "Then she said, ' get me towel'"

[shid]

Don't lower your compression with pistons until right before you turbo/super, because it'll slow down an NA like nothing else.

This post has been edited by shid: Jul 2, 2004 - 12:46 PM

[SlowCelica94]

Then you have killer turbo lag. What to do about that? Let's ask Andason

[shid]

What? Lowering the compression on NA engines will bog them down, but its better for a turbo to have lower compression- what are you talking about?

[SlowCelica94]

I agree. But b4 the turbo spools up, you're running all off ur n/a power. And if you lower the compression, it'll take even longer to spool up. It's not really a big deal, it's only a few grand

[Uppitycracker]

[shid]

Actually, you're running off worse than NA power- NA power alone isn't enough to suck in air into the engine- and thats why you have "vacuum" at the bottom of boost guages. Compression rarely effects turbo lag- rather, it has a strong effect on wether your engine blows up- and at what psi.