tcer904

getting ready to start my build.. (ive never built an engine before)..

should i get my block bored to the next available piston size?

I have good running 2azfe.. i'm assuming because it was in good running order when pulled... that I should be able to use the standard sizes and just get the cylinders honed...

or should i just go ahead an order next size piston and have the block bored to match..???

criminaltc

Since you will have to have the cylinders honed anyways to rebuild it, might as well have them oversize then. Won't cost you much more than a regular honing. Plus, you'll have more motor than too and more power.

tcer904

so bigger cylinder bore increases power also?

criminaltc

Yes, it's more motor. Your 2.4L becomes a bored-out 2.45 or 2.5L. There is more cylinder volume when bored out, creating more power which is where that measurement comes from.

VitaminE

Do a little more research to make sure you go the route that best matches your needs. If you pull the engine apart and the cylinder walls are not too scared and your compression is fairly high and even, there's really no need to get an oversized piston. The oversized pistons being sold are only 0.5 mm larger. That changes a 2.49L to a 2.52L. Still a 2.5L engine. Bigger stroke (size of the crank) will give you a bigger bump in displacement.

For the 2.4L the largest bore is 90mm. That takes you from 2.36L to 2.44L

Focus on the compression ratio. Forced Induction or Naturally Aspirated.

criminaltc

Vitamin, this is a first gen. I'm assuming it's got some miles on that bi.tch. It's going to need honing. The walls are scared to sh.t. I'm 100% sure. Plus he's down with it and know what's needed, so I'm figuring let him do it.

VitaminE

Honing a cylinder wall doesn't require also boring it out.

criminaltc

??? Do you even read? I said since he'll have it out already, he might as well do it. It will cost a little more and the bigger pistons will cost a little more, but it's all worth it since he'll have the hardest part done, and that's having it pulled and ready.

cmcpride

iTrader: (3)

First off.. you need to ask your self are you going NA or boost. NA I would say high compression, bigger valves, port and polish out head, bigger throttle body. Low boost stay with factory piston size. Big boost lower compression.

cmcpride

iTrader: (3)

But no matter what u decide other than factory set up, you'll need engine management.

tcer904

sorry should gave more info on why i was building it..

building it for turbo, with low compression pistons.

tcer904

i've got an aem fic for now...

tcer904

so im thinking just getting the biggest pistons they make for the 2az. which i believe is 89mm.

does anyone have a machine shop recommendation in jacksonville, FL.

cmcpride

iTrader: (3)

R u going with a big turbo.

cmcpride

iTrader: (3)

What's your whp goals.

tcer904

turbo kit from dezod...... i think max's hp is around 350hp or so.

VitaminE

Exactly

tcer904

finally got around to tearing down the motor to inspect the cylinders and what not..

and amazingly this doesn't look like its going to need machine shop work. cylinder walls look excellent.

(a little background on this motor..i purchased it used with supposedly 34k miles on it, to replace another.... but ended up not needing it. kept it anyway with the intention to build it up for turbo...)

anyhow,, it looks like this motor was rebuilt at one point.

some photos of the cylinders attached.. looks good to me what you guys think? measure the bore and just buy proper pistons..

video https://www.dropbox.com/s/byw1jkze8u...72337.mp4?dl=0
video 2 https://www.dropbox.com/s/y8pi4t8x1k...72514.mp4?dl=0

VitaminE

They "look" really good. Pistons are clean. Did you do a compression (leak down) test? That will really tell you what's going on. But for the looks of the piston tops and cylinder walls I'd say you're in good shape. Get stock size pistons (save on machine work), get a lower compression (with a turbo it will make tuning a little more forgiving if you make a mistake), and throw it back together with new rods and bearings. If you are not pressed for time (or $$) get a port and polish on the head and valves.

Other than fueling and tuning, have fun.

Great job going this far with it.

tcer904

hmm.. looks like someone already removed the balance shafts.. and welded the oil hole up..

but why keep the cover/retainer in there.. if there's no balance shaft?