What kind of performance value would stroking my 2.4L to a 2.5L be? Also, if I get oversized pistons (20 over) what kind of literage would that be? Still 2.4L (or 2.39.. what ever our engines are.)
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Also, how big could you make the engine by stroking and boring it?
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u can bore it to a 2.7 but that is getting pretty damn thin...., not sure aobut the stroking tho, dont knwo anything about it
get a 2.3 H/O block and machine the journals to take a 2.4 crank. It makes it a 2.5 right off the back and takes the balancing shafts out of the picture. You can then bore the 2.3 block as well but I wouldn't even bother.
Cardomain|
Myspace
i remember seeing a stroker kit for the 2.4 a while back on www.dragevolution2200.com but for some reason that site isnt there anymore. it strokes the engine from 2.4 to 2.6 and they claim it puts out 185hp and 190 lb/ft of torque on a stock engine.
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450WHP Turbo Ecotec swap in the works...
You'd be better doing what LGO said. Taht way you will still be able to rev the engine. Otherwise you would have to do a really good balacing and a good buildup to still rev at the same rpm and not loose power.
You would have to machine the main journal 8mm smaller.
Btw, does somebody have a 2.4 crank for sale? Josh are going to have one?
Gilles
2.3 Ho
well, if hotrod was right and you can bore an LD9 out .1" + at .1" over you're @ 2.524L
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** Flat Broke Racing Inc.**
mfk i have a 2.4 crank.you wanna buy it?
that hotrod magazine article was wrong.
there is a HUGE tech writeup on stroker quads if you check out quad4forums.com.
you dont overbore a 2.4 out. you should try to stroke out a 2.3, which has the larger bore anyways. it can be done, and there are some prototypes out there. when you are using 2.3 heads and stuff, on a 2.5L motor, it should have a flat torque curve of well over 200 lbs of torque, all the way to redline.
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"What are we going to do tonight?"
"The same thing we do every night, try to make the SVC go faster!"
Mfk-223 wrote:Btw, does somebody have a 2.4 crank for sale?
i have one but you cant have it.
has anyone actually proved them wrong? i know they've been wrong on things before but there is still a good chance and it makes perfect sense that i could be done...
I guess i'll find out when i start getting into my own. everyone that i've re-build the customer has never gone over .030" over, no need to sonic check that
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** Flat Broke Racing Inc.**
think about this one for a moment. you have a 4 cylinder block that you want to bore over 3mm? thats not safe in any motor. they wont do that in big block V8s. a more sound idea would be to put a 2.4 crank into a 2.3 block. that is something they would do on most motors if they could make it fit. well, it will fit if you know what and where to machine.
not to mention, the 2.3 has the best flowing intake, head, and exhaust. it has hotter cams, and no balance shafts. thats 5 more reasons to stroke out a 2.3 instead of trying to bore out a 2.4.
some people say you could convert the 2.4 block to be able to not have balance shafts, and you could put on a 2.3 top end, but thats alot of trouble to use 2.3 parts on your 2.4 block, which could very well be weak from you overboring the motor too far.
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"What are we going to do tonight?"
"The same thing we do every night, try to make the SVC go faster!"
to add to SVC....the 2.3L can go to 2.6L easily (.030" overbore) and get you over 300hp at the crank, and can be driven daily, you do that to a 2.4L and you better be trailering it to the strip and tearing it down afterwards.
I got the instructions on how to do it, directly from the Quad4forum, and the 95 2.3L and 2.4L are basically paperweights when it comes to major motor mods. the major thing being the balance shafts, oil pump, head, cams, and cylinder wall thickness (2.4L).
I so want the 2.6L conversion, but with the house and the other cars needing fixed. I had to hold off until a later time.
My 2.4 has been bored 40 over ... I made sure the machine shop knew what they were doing and said that the block should be fine after boring. This is my daily driver also
speedvisioncavalier wrote:think about this one for a moment. you have a 4 cylinder block that you want to bore over 3mm? thats not safe in any motor. they wont do that in big block V8s. a more sound idea would be to put a 2.4 crank into a 2.3 block. that is something they would do on most motors if they could make it fit. well, it will fit if you know what and where to machine.
not to mention, the 2.3 has the best flowing intake, head, and exhaust. it has hotter cams, and no balance shafts. thats 5 more reasons to stroke out a 2.3 instead of trying to bore out a 2.4.
some people say you could convert the 2.4 block to be able to not have balance shafts, and you could put on a 2.3 top end, but thats alot of trouble to use 2.3 parts on your 2.4 block, which could very well be weak from you overboring the motor too far.
LOL, i've gone .1" over on slantsix engines, i've gone .1" over on some 318 cid mopars, so yes it is do-able, and why wouldnt it be safe? as long as you have a "within spec" reading on cylender wall thickness. I dont belive for a second the 2.3L head is better than a 2.4, in stock form i do agree,but with work the 2.4L head can out do the 2.3 head or be just as good as a modded 2.3 head.
we'll find out
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** Flat Broke Racing Inc.**
isnt just about every rebuilt engine bored out .030 over?? i know mine is but i didnt think it was much of a displacement increase...i know it doesnt really feel any faster
Supercharged 95 BMW 540i M-Sport
can you use any 2.3 block, or does it have to be a HO motor? I can get me a 2.3 LO really easily, not sure about the high output though.
thanks guys
And if you bore out a 2.4L 30 over you are only adding .003" .. making the displacement go from 146 to around 149-150 .. mine is bored 40 over and sits at about 152cc making mine a 2.5L ... its not as much as some of you make it sound.
Manitoba Motorsports wrote:speedvisioncavalier wrote:think about this one for a moment. you have a 4 cylinder block that you want to bore over 3mm? thats not safe in any motor. they wont do that in big block V8s. a more sound idea would be to put a 2.4 crank into a 2.3 block. that is something they would do on most motors if they could make it fit. well, it will fit if you know what and where to machine.
not to mention, the 2.3 has the best flowing intake, head, and exhaust. it has hotter cams, and no balance shafts. thats 5 more reasons to stroke out a 2.3 instead of trying to bore out a 2.4.
some people say you could convert the 2.4 block to be able to not have balance shafts, and you could put on a 2.3 top end, but thats alot of trouble to use 2.3 parts on your 2.4 block, which could very well be weak from you overboring the motor too far.
LOL, i've gone .1" over on slantsix engines, i've gone .1" over on some 318 cid mopars, so yes it is do-able, and why wouldnt it be safe? as long as you have a "within spec" reading on cylender wall thickness. I dont belive for a second the 2.3L head is better than a 2.4, in stock form i do agree,but with work the 2.4L head can out do the 2.3 head or be just as good as a modded 2.3 head.
we'll find out
you can believe what you want about the 2.4 head being equal to that of the 2.3. i mean, which one flows more air? which is the head on the motor that was making 40 mph hp? (W41 motors) lets be realistic. the 2.3 ports dwarf the 2.4 head. if you want to hog them out then its changes things, but the 2.3 head still will allow larger ports than the 2.4. fact of life.
and that still doesnt address the fact that the 2.3 doesnt have the balance shafts, and had the better intake and exhaust, and came with hotter cams and the lifter bores are slightly larger allowing for cams with a higher lift without modification to the cam towers.
as for you being able to overbore a few engines to .100" over, yes, there are some motors out there with tons of meat and you can bore them out safely, but that is not the norm, nor is it the case with the 2.4 block. bore one of those blocks 3mm over and you can check the specs, and see that it will be too thin.
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"What are we going to do tonight?"
"The same thing we do every night, try to make the SVC go faster!"
a 2.4 block bore 40 over is not a 2.5. It's a 149Ci engine(2445 CC), witch is not a 2.5.
As for the head. The Ho vlave are like 1.5 time bigger than the 2.4 valves. Unless you do some major machine work on the head, the 2.3 head will still be ahead.
the Ho and Lo engine shared the same block.
As for going 3mm over on a 2.4 block is like dreaming of winning the lottery. Unless you get a good set of sleeve and you have 2-3 spare engines ready to mount. It won't last for sure. The temps would go too high and the wall would be shot after a few miles. For drag only maybe I would do it but I wouldn't trust it. For daily driver? It's just a dream.
As for the 2.4 crank in the 2.3 block, you would have to get the main turn 8mm smaller. You need a 2.3 gear press on the 2.4 crank. You need customs pistons.
Cps pickup notch are not at the same spot so timming may be affected.
That's what I can think of for now.
Gilles
2.3 Ho
So, is getting 20 over pistons not a good idea?
Other than that question I've come to these conclusions.
1. Not a good idea to overbore a 2.4L
2. Unless I'm making a hybrid, stay 2.4L
3. Shorter rods, make less revs = less of a power band
SO, I'm planning on using a GM Charger with a smaller pulley. I have a P&Pd Head w/ SS Valves, HO header port matched to the head. I'm going to get eagle rods and new pistons. I'm also going to get the supercharger port matched to the head also (which is a noticable bit bigger than the stock 2.4L head.) I have a 2.5" cat back and high flow cat. This should all put me at I'm guessing around 200ish at the wheels I hope.
SO would I be safe to just bump the compression up for the charger to get more power.
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better to turn the mains in the block (2.3L block) instead of the crank (2.4Lcrank) to keep the strength in the crank, and a machine shop (the one doing the motor work anyway) can press the oil pump gear on. As for the reluctor ring, the shop (again, same one) can fill the notch that's wrong and machine out a new one in the proper location. also, JE can make the pistons for a fair price (get them at TRS)
you want to really do this then go the
quad4forum and look around, if you need the instructions on how to do it, I have them in PDF and will be happy to email them to you.
word of caution, get a machine shop that has done work on Quads, Josh from TRS can show you or build the motor for you (not a bad price, but may take some time, busy man). this motor N/A should be around 300 CHP with the right add ons, and can go turbo with ease (just tell them when you get the pistons or the motor built)
you said stroke......
Um yea the 2.4 is actually a bigger stroke Quad 4 and stroking it LOL ( i cant stop laughing) further would not be a good idea you can however go slightly bigger on your bore and pick up some displacement there
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
Hotbug - I never tought about doing it on the block. Hum, That's better than.
I have a really good machine shop that know how to do it. They did all my machine work on the engine that I have right now. I was thinking about Wiseco for the piston and I will go with Karo. As for the reluctor ring, I have a good welding shop in my town so it's all good.
Hum, 2.3 Block bore at 93mm with a 94mm stroke give a nice 2554cc engine.
I will go N/A on that one.
Sunfire Gt - I will email you for your crank
Gilles
2.3 Ho
