Advantage/Disadvantage of Bore and Stroke?

Sam Baker · Post by **Sam Baker** » January 7th, 2005, 2:17 pm

hey i was just wondering what kinda power gains you would get by boring/stroking a KLZE (i'm not gonna do it, but my friend is thinkin bout it).. and how would it effect responsiveness? o also, whats the highest you could bore it out to? like 2.8L or so? i know this is a noobish question, but im just curious cuz i've heard of people doing it before.

thanks

babyblueMX3 · Post by **babyblueMX3** » January 7th, 2005, 2:20 pm

to be a 2.8 you have to resleeve and that will cost your friend an harm and a leg...I only saw once a guy with a 2.5 that was stroked..so I don't think you'll find much info on a 2.5 stroked.

mitmaks · Post by **mitmaks** » January 7th, 2005, 2:46 pm

youll get more hp/tq with bigger pistons, port heads, itll spin slower though. I wonder how big you can bore k8? 2.0...2.5L???

ZEmadman · Post by **ZEmadman** » January 7th, 2005, 2:46 pm

your friend should just bore it out and up the compression to 11:1 i would think that would add about as much power as possible on a nice enough budget that you wouldnt have to sell all of your worldly possesions to attain.

Sam Baker · Post by **Sam Baker** » January 7th, 2005, 3:03 pm

yea i told him bout CZT 11:1 pistons.. but he's set on boring it to 3.0L.

i duno if thats even possible! but with that CZT kit, i would think that would be enough power really.. thats what you got right steve? the only thing is that he wants NA with no sc or turbo. sounds like a lotta work

DavidOS · Post by **DavidOS** » January 7th, 2005, 4:33 pm

2.6ltr
skyline engines come with that bore i htink... so theoretically you could steal their pistons and s---

as they are better for more hp naturally.

babyblueMX3 · Post by **babyblueMX3** » January 7th, 2005, 4:36 pm

Sam Baker wrote:yea i told him bout CZT 11:1 pistons.. but he's set on boring it to 3.0L. i duno if thats even possible! but with that CZT kit, i would think that would be enough power really.. thats what you got right steve? the only thing is that he wants NA with no sc or turbo. sounds like a lotta work

yeah I got my piston/rod kit from czt. I got the 8.7 compression ratio though

Think about that..You have ovebore 0.320" to get it to 3.0L...that is major stuff here

lakersfan1 · Post by **lakersfan1** » January 7th, 2005, 4:51 pm

Sam Baker wrote: but he's set on boring it to 3.0L. i duno if thats even possible!

Not gonna happen. Even with huge bore and stroke, I think the highest it's gotten was like 2.8 or 2.9 liter. However, most people who've stroked have had issues with it.

Sam Baker · Post by **Sam Baker** » January 7th, 2005, 5:00 pm

hmm.. yea i remember that 2.8L TT KLZE on ebay, but i would think a 2.6 or 2.7 with the CZT 11:1 kit would work right? just thought i'd ask for some info since you guys know the best.

i cant even imagine how much it would cost to make this custom job work lol, but thanks for the info

newflow · Post by **newflow** » January 7th, 2005, 6:06 pm

Any dyno on that BABYBLUEMX3?...I have a 10 Gs to invest on the car and the engine kit from GTZ is in my list.

Any info you would like to give me, would be really appreciate.

My list:
2.5 klze
GTZ Engine kit
Custom Dual Exhaust System
Center Stage 3 Clutch
PRM intake system
Fuel control
...

babyblueMX3 · Post by **babyblueMX3** » January 7th, 2005, 6:37 pm

newflow wrote:Any dyno on that BABYBLUEMX3?...I have a 10 Gs to invest on the car and the engine kit from GTZ is in my list.

Any info you would like to give me, would be really appreciate.

My list:
2.5 klze
GTZ Engine kit
Custom Dual Exhaust System
Center Stage 3 Clutch
PRM intake system
Fuel control
...

no no dyno yet..the engine is built but not in the car yet...
what is GTZ ?

Sam Baker · Post by **Sam Baker** » January 7th, 2005, 8:48 pm

newflow wrote:2.5 klze
GTZ Engine kit
Custom Dual Exhaust System
Center Stage 3 Clutch
PRM intake system
Fuel control

CZT? Centerforce?

bmwm3guy · Post by **bmwm3guy** » January 7th, 2005, 10:42 pm

yea... the motor on eBay was a 2.8L but I dunno how much of a block you would have left...

hey steve.. any pics of the motor?

babyblueMX3 · Post by **babyblueMX3** » January 8th, 2005, 10:17 am

sorry no pics yet..

kiwi_MX3 · Post by **kiwi_MX3** » January 9th, 2005, 5:04 am

I will be looking into this later on in the year when im ready to
build my motor and will probably find its way into the FAQ's.

IE wall sizes left in blocks,

As to stroking motor's the perpose in most case's is not to
increase displacement of the engine but to change the rod
ratio which imparts different caracteistics on the motor

And of course getting bits to fit. my VW challanger motor used
chevy rod's and mitsubishi piston's more for the reliablitiy factor
than stroking...

but the three basic's of engine building remain the same.
Cam's, Carb's, Combustion.

But currently i have in the computer dyno base figures for the
KLZE and the Intake mainafold simply strangles the poor wee motor!

Hell a set of IDA carb's out the hood would bolt on 50-60HP and look
grouse doing it too.......

Matt