Plans for the Aveo

Brian5475E · Post by **Brian5475E** » Mon Mar 20, 2006 2:29 am

Well I deceided what I am going to do. I need to find the 10.5:1 pistons for the 1.6. gonna stick those in. Build the interface and intall the dis-2, and hopefully find cams. Already working on a header. So hopefully I can get to 150hp

MMamdouh · Post by **MMamdouh** » Mon Mar 20, 2006 9:41 am

are their 10.5:1 pistons for a T20SED??

MMamdouh

ubuyau · Post by **ubuyau** » Mon Mar 20, 2006 9:50 am

A high compression NA Aveo - its different for sure. Lumpy cams would give that a mean gurgle exhaust note i believe!

You wouldnt consider making a low boost turbo setup? You'd hit that hp number, but you'd get that torque curve

--Tim

frenchard101 · Post by **frenchard101** » Tue Mar 21, 2006 1:26 am

What is the compression ratio? Is that the ratio of air to fuel? I have an aveo and im willing to do anything to beef it up, let me in on your secrets

Brian5475E · Post by **Brian5475E** » Tue Mar 21, 2006 2:04 am

frenchard101 wrote:What is the compression ratio? Is that the ratio of air to fuel? I have an aveo and im willing to do anything to beef it up, let me in on your secrets

No. That is the compression ratio. I would advise you not to mess with internals unless you know engines. I'm just not to familier with the internals on this one. should be simple.

frenchard101 · Post by **frenchard101** » Tue Mar 21, 2006 2:34 am

im pretty familiar with engines, still learning some stuff though. i dont plan on messing with the internals of the engine until im really comfortable with it. I was just wondering what the 10.5 stands for. cause i know stock aveo has a 9.5 ratio, whatever it means

MMamdouh · Post by **MMamdouh** » Tue Mar 21, 2006 7:41 am

compression ratio is the ratio between the size of the combustion chamber at BDC and TDC... the bigger the ratio the more effecent your engine is.

MMamdouh

ubuyau · Post by **ubuyau** » Tue Mar 21, 2006 8:26 am

MMamdouh wrote:compression ratio is the ratio between the size of the combustion chamber at BDC and TDC... the bigger the ratio the more effecent your engine is.

MMamdouh

And with the higher compression, the more critical the air fuel ratio and timing becomes.

--Tim

frenchard101 · Post by **frenchard101** » Tue Mar 21, 2006 6:57 pm

I see. So whats the purpose of lowering the compression for turboing? I was reading on some other threads of people adding 1mm to the gasket to lower it to about 8.5 for a turbo project

DomWoo · Post by **DomWoo** » Tue Mar 21, 2006 7:38 pm

that is kinda like a no brainer question... you want ot lower the compression because a turbo is a compressor and pressurizes the combustion chamber at BDC (bottom dead center) and with its a TDC the compression is much greater. that is why you want ot lower it with a turbo

frenchard101 · Post by **frenchard101** » Tue Mar 21, 2006 8:12 pm

well there ya go, you learn something new every day

Post by **PrecisionBoost** » Wed Mar 22, 2006 4:48 am

Brian5475E wrote:Well I deceided what I am going to do. I need to find the 10.5:1 pistons for the 1.6. gonna stick those in. Build the interface and intall the dis-2, and hopefully find cams. Already working on a header. So hopefully I can get to 150hp

If I were you I'd research the X16XE as I think it came with 10.5:1 compression allready.

I also think the lift on the X16XE cams is lower due to the higher compression.

If you want to do it right you have to have some custom pistons made by JE (or another reputable manufacturer)

What you do is put in your new cam (assuming more lift than factory) and then add soft clay to the top of your factory piston.

Then you carefully rotate it around and it leaves valve impressions in your clay on top of your piston.

Then you measure everything out and give that info to JE and they will model you a new set of pistons which will clear the higher lift valves.

I'm just trying to think of everything they need..... Deck height to stock piston height, gasket thickness, chamber volume.... I think that's it.... I'd have to check into it further.

The best bet is to have a reputable shop set up the pistons for you..... not sure on the cost..... probably a few hundred bucks to get the dimensions figured out.

It might be tempting to take the X16XE pistons and machine out larger valve relief sections but that will weaken the piston... especially if your adding 2 or 3 millimeters of lift.

I wonder if any of the UK/Europe companies allready have piston/cam combinations...... that would be the best if they did as they would have allready done all the work ahead of time.

The biggest problem with UK stuff is it's so darn expensive...... seems like twice the price of what we would pay in many cases.

Brian5475E · Post by **Brian5475E** » Wed Mar 22, 2006 1:01 pm

The 1.6L with the higher comporession pistons have the same bore and stroke as the Aveo. If your talking about wrist pin height, I can't see why it would be different. I'll just have to get a piston from a Aveo and a x16xe

MMamdouh · Post by **MMamdouh** » Wed Mar 22, 2006 1:04 pm

MMamdouh wrote:are their 10.5:1 pistons for a T20SED??

MMamdouh

BUMP!

MMamdouh

Post by **Efratech** » Wed Mar 22, 2006 2:34 pm

mmamdouh, you can use XE pistons and rods on a 20SED its been said before

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Plans for the Aveo

Plans for the Aveo

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