Hey all,
I talked to a guy this weekend, Dan if you're out there holla, who said another is boring cylinders for the tC.
What do you guys/gals know about cylinder boring? We got some really smart people on here :bow: (and some real idiots...myself included :lalala: ) and i'd like to hear your thoughts (no idiots please :ttth: ).
ramifications, piston replacement, how bore effects hp/torque (maybe a ratio?)
any links to articles explaining the process are appreciated too.

Jotech bored their cylinders 1.5mm over and sleeved them to up displacement, that combined with new pistons, lowered compression to allow for more turbo boost. 30psi! :shock:

Cylinders get bored when they fall out of spec due to age or wear and start to lose compression. The cylinder is bored to bring it back to spec due to wear or actually increase its displacement.

Generally the cylinders are sleeved when either they can't be bored due to damage or they are at maximum bore. Judging that Jotech sleeved the cylinders after boring 1.5mm over, 2.5L must be the maximum displacement our blocks can handle. Probably sleeved for added cylinder strength due to that ultra high amount of boost.

i believe the car can go up to 2.7.

but i could be wrong

:shock: 2.7! That's freakin' huge. Correct me if I'm wrong but wouldn't there be little to no wall in between cylinders?

i do believe that the 2.7 inline-4 engine in the tacoma is almost the same engine

so thats my assumtion

my cylinders get bored when i dont drive my car for a while

my cylinders get bored when i dont drive my car for a while :rofl: :rofl:

whats up dude. sorry im on vac so im away from the computer. but what i was talking about was getting the upper intake ported and polished. there is a thread on it. ZPI is actually doing it. they said something about gains of 40-50 hp. gotta see what happens. its almost to good to be true. shoot its still cheaper than a SC. but im pretty sure you'd have to run high octane. k bro hit me up laters, this snow in IL is killing me. wanna use my sun roof :pray:

gotcha Dan, ignore my PM. i was thinking of cylinder boring, now i understand.
i'd like to have an NA @$$ hauler. everyone is gonna boost their tC. i like my rides like my women, all natural baby! wait, no excessive body hair, and no hippy chicks, OK and fake racks are fine sometimes.
nevermind, maybe i'll just boost mine too :eyebrow:

same here but the bad thing bout NA is once you up the compression ratio in ur engine...

most likely your going to experience harder knocking than turbo cars (thats if you use low octane)

NA sounds super cool but gettin pistons or anything else done for your car isnt cheap... i know, i've tired.

it's a hard knock life
for NA engines with low octane gas.

haha oooohhh im telling your wifey :rofl: just kidding. i just got back to work from my vac. man i would rather stay at home and do nothing. it was great. my co worker is getting that CD made for me. what its finished ill give a copy to steven.

Jotech bored their cylinders 1.5mm over and sleeved them to up displacement, that combined with new pistons, lowered compression to allow for more turbo boost. 30psi! :shock:

Cylinders get bored when they fall out of spec due to age or wear and start to lose compression. The cylinder is bored to bring it back to spec due to wear or actually increase its displacement.

Generally the cylinders are sleeved when either they can't be bored due to damage or they are at maximum bore. Judging that Jotech sleeved the cylinders after boring 1.5mm over, 2.5L must be the maximum displacement our blocks can handle. Probably sleeved for added cylinder strength due to that ultra high amount of boost.

I'm sorry but didn't Jotech re-sleeve thier engine. Thats what I read in sport compact not sure where you got your info from. and actually you can go bigger than 2.5. If you do you need to use ductile sleeves. If you are going to boost I would only go to 2.5 though.

Jotech bored their cylinders 1.5mm over and sleeved them to up displacement, that combined with new pistons, lowered compression to allow for more turbo boost. 30psi! :shock:

Cylinders get bored when they fall out of spec due to age or wear and start to lose compression. The cylinder is bored to bring it back to spec due to wear or actually increase its displacement.

Generally the cylinders are sleeved when either they can't be bored due to damage or they are at maximum bore. Judging that Jotech sleeved the cylinders after boring 1.5mm over, 2.5L must be the maximum displacement our blocks can handle. Probably sleeved for added cylinder strength due to that ultra high amount of boost.

I'm sorry but didn't Jotech re-sleeve thier engine. Thats what I read in sport compact not sure where you got your info from. and actually you can go bigger than 2.5. If you do you need to use ductile sleeves. If you are going to boost I would only go to 2.5 though.

Are you having trouble reading my post? That's exactly what I said and I got my info from Modified. I never specifically stated for sure that 2.5 was max and left that open for correction to anyone with solid evidence (which you didn't give).

Direct quote from Modified:

"The block was machined, bored 1.5mm over, sleeved and O-ringed totalling 2.5L" All this info came from Kenny Tran himself, the one who built the car, so I'm sure it's accurate.

NO, you can't bore the stock engine, the service manual tells you to change the block when the cylinders are out of spec because the iron liners are too thin to bore. You need to sleeve it to get more bore.

Then I guess Kenny Tran has no idea what he's doing, we'll leave it at that :eyebrow:

Then I guess Kenny Tran has no idea what he's doing, we'll leave it at that :eyebrow:

is that sacarsim?

IMO i believe kenny tran knows wat he's doing. but i dont think kenny tran rebuilt the 2az in the jotech TC. most likely his team of engineers did.

and are we still talking about the topic of boring out the stock block to comparsion of the jotech tC?

jotech TC recieved a short block with new sleeves.
boring out stock block? beats me... :yawn:

why is this thread still going on

my fault for starting it!
if i could kill it, i would.
supermod...kill this post!!!
is it just me or do all these posts just have dudes getting ____u with each other about differences in opinion

i bored out my heads. now im running on bannana octange race fuel. :eyebrow: good job ryan j/k

yo fluffy pillow boy,
why don't you make like the sta-puff marshmallow man and get outta here, before you get creamed :doh: j/k2
cylinders are boring, but ports are good!
any word from the guy who was doing that?