SR Stroking

[JDMEnthused]

is it even worth it to stroke the SR20 out? if anyone actually has a stroked SR, please tell me how well it responds. i would like to know how much extra power or torque it will put out if it is stroked to.. 2.2, 2.4 or the highest possible without making the cylinder walls too thin.

[carterceo]

Stroker kits are common on SR's in Japan and I would always recommend a increase in displacement if other power options have been considered. I have an SR with 87mm bore and 92mm stroke. So total displacement is now 2188cc as opposed to 1998cc. Unfortunately the motor is not in the car yet, the good news is all the SR's that i have seen with the kit I am running have T88 turbo's on them, so if it can spool a T88 it can certainly spool at GT30R or GT32R with ease.

You will only need sleeves if you bore the block. Still it is not required but I highly encourage sleeves. JUN, HKS, and Toda all make sleeves for the SR all at 87mm bore I think but im sure a domestic company can custom make them.

Stroking changes the distance that the piston travels in the cylinder. So, stroke increase has little to do with cylinder wall thickness. Please someone correct me if I am wrong though.

I would increase my stroke before increasing the bore, but its pointless to just do one without the other.

JUN is the kit I am using, You can find it here:http://www.junauto.co.jp/produ...ml?en

Here is a Site with most of the name brand kits, sorry it contains nothing more than prices.http://www.sportcarmotion.com/sr20main.htm

The just of this post is if you get a JUN/Tomei/Apexi stroker kit, people may laugh at me when I say this but 750 to 850hp is possible.

If you have any questions let me know.

[JDMEnthused]

your right.. but, cylinder wall thickness does have something to do with boring the cylinders out or sleeving them to put in bigger pistons to increase the displacement. thanks for the info man.. you are slowly curving my interest in getting an SR. i may just get one and buy a stroker kit and then put oversized valves and pistons in the motor.

[JDMEnthused]

JUN is the kit I am using, You can find it here:http://www.junauto.co.jp/produ...ml?en

Here is a Site with most of the name brand kits, sorry it contains nothing more than prices.http://www.sportcarmotion.com/sr20main.htm

a little pricey heh

[Nismo_Freak]

Why bother stroking the motor when you have a KA available?

[carterceo]

Yes, it is pricey. Thats why I recommend completing every other component upgrade first. I have no doubt you could have a kit custom made at machine shops around your area for far less. But when I read about JUN pulling an 8.8 second quarter mile I figured they may have something special with this stroker kit. Ill keep you in mind if I ever get mine running.

Nismo_Freak - The reason I went SR stroker is because of all the support for it in Japan. Just about any shop in the greater Osaka/Kobe area has had at one point a stroked SR and they all have made 8-9 second runs on them. Plus I dont wanna get made fun of for bragging about a truck motor. The question I have for KA guys is why is nobody in Japan importing a KA?

[JDMEnthused]

Plus I dont wanna get made fun of for bragging about a truck motor. The question I have for KA guys is why is nobody in Japan importing a KA?

lol, good point mang

[SeVa-S13]

Hahaha, you're afraid of being made fun of? Funniest crap I've read recently.

[JDMEnthused]

Hahaha, you're afraid of being made fun of? Funniest crap I've read recently.

everyone has their opinions.

[574-240sx]

I have both and both have their ups and downs. KA-T seems to be cheaper but more labor and custom fabrication. SR seems to be more expensive with some great parts to choose from with less fabrication involved. I still have yet to get my S14 SR figured out, I have only messed with it for an hour and got it to drive down the block.

[Nismo_Freak]

Nismo_Freak - The reason I went SR stroker is because of all the support for it in Japan. Just about any shop in the greater Osaka/Kobe area has had at one point a stroked SR and they all have made 8-9 second runs on them. Plus I dont wanna get made fun of for bragging about a truck motor. The question I have for KA guys is why is nobody in Japan importing a KA?

I wasn't aware that you are in Japan, that makes the KA a bit outlandish.

[carterceo]

Im actually not in Japan anymore, but if you actually go over there and take a look around its really easy to find great stuff. I wasnt very clear on that with my post though, sorry about that.

[Nismo_Freak]

I just can't quantify spending multiple thousands to build a stroker SR when the KA is a $400 option with a large stroke.

It'd be like buying a stock C6 and stroking it to a 427. Alot of money when you could have just stuck with a Z06.

[spider_slayer]

I just can't quantify spending multiple thousands to build a stroker SR when the KA is a $400 option with a large stroke.

It'd be like buying a stock C6 and stroking it to a 427. Alot of money when you could have just stuck with a Z06.

if you are afraid of being made fun of because you have a truck motor then you need to stop reading the tuner mags, dude.

[180fan]

or you can do what i do everyday if you want to stroke the sr. Pop the hood and stroke the valve cover. oh so pretty! lol

[carterceo]

if you are afraid of being made fun of because you have a truck motor then you need to stop reading the tuner mags, dude.

That was supposed to be a joke, I have nothing against the KA. I do know that all the shops I spoke with in Japan said 600+hp was very simple with a stroker kit. I found a stroker kit for a very good deal and I got it. I had no intentions of offending people by suggesting a stroker kit but everyone on this board seems to get angry when I mention it. I read this on another board and it makes perfect sense. " Power, Reliability, Inexpensive, which two do you want" I wanted reliable power.

or you can do what i do everyday if you want to stroke the sr. Pop the hood and stroke the valve cover. oh so pretty! lol

I fully agree, I stroke my intake manifold too.

[98silvia]

yes sir, i got a s14 sr20det motor, i would like to put on a storker kit on the motor, or maybe i will put on a biger piston in there, but i really want to know how much for the storker kit. thanks for your time

[Nismo_Freak]

That was supposed to be a joke, I have nothing against the KA. I do know that all the shops I spoke with in Japan said 600+hp was very simple with a stroker kit. I found a stroker kit for a very good deal and I got it. I had no intentions of offending people by suggesting a stroker kit but everyone on this board seems to get angry when I mention it. I read this on another board and it makes perfect sense. " Power, Reliability, Inexpensive, which two do you want" I wanted reliable power.

It's not so much offend as it's we're all tired of the "OMG I'm 16-yrs. old and now I'm gonna go build a stroker SR but I only wanna spend like $25k and can you tell me every part I need and why, k thnx" community.

You don't seem to be one of those types. Honestly, if you can afford it and it's what you want, then go for it. You will need to port the head quite a bit, and of course, you must go Big.

Make it happen.

[JDMEnthused]

ehhh.. whose 16 in here?
Modified by JDMEnthused at 7:46 PM 10/15/2005

[98silvia]

yes sir, i been looking all over the web, all the stroker kit i find at last 4500.00, is any where that i can find a stroker kit for cheaper than that. i don't care is a used one or not. please tell me where i can find it. thanks

[JDMEnthused]

lol if u wanna take the cheap and... less reliable way out, look on Ebay.. or go to http://www.fatfingers.com.. good luck though. stroker kits for an SR are very rare in the states.

[UK-SRi]

Stroking an SR will give you a low reving car with high bore wear as the deck height is too low for a decent rod/stroke ratio. Your redline will come down a lot.

You can sleeve and over bore to 90Definitely ok-92(maybe, depending upon which sleeve kit you buy)

Mike

[TougeTune180]

please tell me if this sounds rediculous or not, buit i wanna get the JWT SR24DET kit, run like an HKS GT3035 or so turbine, like 750 or maybe 1000cc injectors, like a 3 or 4 lb custom flywheel with os giken twin plate clutch and cross mission gear set, do toda valve train, port and polish, sleeve the block, and all the machining goodies on the block/head and put like 475 hp at around 12-13 psi of boost...what would you guys think a good redline for that kind of setup would be? 7500 still? or do you think with like an hks f-con i could push maybe 8k? btw i wanna use this setup for drift, Formula D type stuff so i way need the power, but it needs to rev fast and respond quickly, hence the flywheel that almost isnt there....i know it wont be streetable, its not meant to be, its gonna be competition only. what do you guys think, sorry about the long post

[Dori Dori]

I feel like shooting myself after reading this thread.

Alan is right, if all you want is a stroker motor, getting a SR is RETARDED. KA is already "stroked" and comes with a near perfect rod ratio. Just put that money you were gonna spend on overpriced JDM crap into a proper build up on a KA, standalone, and tune and you'll be much better off.

[jgauspohl]

Wish I woulda stuck with the "getting made fun of truck motor" instead of going all out on my sr and I didn't even stroke it ...once you get started you have to finish though .....**** and now I've lost a year of sliding. Thinking about selling the sr actually lmfao after I get the head back...jk

[carterceo]

Stroking an SR will give you a low reving car with high bore wear as the deck height is too low for a decent rod/stroke ratio. Your redline will come down a lot.

You can sleeve and over bore to 90Definitely ok-92(maybe, depending upon which sleeve kit you buy)

Mike

Redline with the JUN kit will be 8000-8500RPM They built it with 280 cams, which I would prefer something more streetable but in think JUN knows more than I do.

I feel like shooting myself after reading this thread.

Alan is right, if all you want is a stroker motor, getting a SR is RETARDED. KA is already "stroked" and comes with a near perfect rod ratio. Just put that money you were gonna spend on overpriced JDM crap into a proper build up on a KA, standalone, and tune and you'll be much better off.

The JDM crap I purchased I have much more confidence in. JUN made multiple 9 second runs with this kit, it was producing over 700hp. If i could send a KA to someone and have them do the same thing I would have, but I know of no company that does this and is willing to stand behind their product. If your worried about the costs, you have obviously never tried too hard to find a good deal. SR22's are easy to come by in Japan for under 5k. I paid alittle more because mine had JUN stage 3 head and GT intake manifold with primary and secondary injectors. But not much.

I know im not gonna change anyones mind about this, I dont care. When I decided to build this car I decided I wanted very good reliability with very high horsepower, it certainly did cost more than avererage but I know beyond a doubt I have done it right and I will be very satisfied.

I guess the moral of the story is, if your ever in Chattanooga and you see a black 240sx with a JUN sticker race me!

[95lstegman]

please tell me if this sounds rediculous or not, buit i wanna get the JWT SR24DET kit, run like an HKS GT3035 or so turbine, like 750 or maybe 1000cc injectors, like a 3 or 4 lb custom flywheel with os giken twin plate clutch and cross mission gear set, do toda valve train, port and polish, sleeve the block, and all the machining goodies on the block/head and put like 475 hp at around 12-13 psi of boost...what would you guys think a good redline for that kind of setup would be? 7500 still? or do you think with like an hks f-con i could push maybe 8k? btw i wanna use this setup for drift, Formula D type stuff so i way need the power, but it needs to rev fast and respond quickly, hence the flywheel that almost isnt there....i know it wont be streetable, its not meant to be, its gonna be competition only. what do you guys think, sorry about the long post

damn i wish i had skipped reading this one

[Mike Wazowski]

90mm bore X 86mm stock stroke

stock revability with bigger displacement

[jgauspohl]

where you at ....lmfao...ok first of all you just talked about spending pretty much ****loads on a stroker from jun....and you drive the thing daily...in Chattanooga? Riiiiggghhht....post em man don't just say if you see a sticker eat me ...that'll just make us thing you're bs'in .

[jgauspohl]

**** I'll post my **** that ain't even running yet...and you can come find me