Hey guys, havent been around in a while. Last time i checked on this subject the best option was, to use the 2.4 crank and rods and have the mains enlarged to fit the 2.4 crank. It had been undecided whether to use the 2.3 pistons, modified to use the 2.4 wirst pins top attach them to the rods, or get a set of 2.4 pistons in the bore size of the 2.3 cylinders (ended up being a .100 overbore i think). I am pretty sure some of you have this done, so what are you using? Spdrcr, i think i remember you saying you were going to use 2.3 pistons and have them modded, how did that work out? Or, alternatively does anyone off 2.4 pistons in that extreme of an oversize? Can they be custom made without costing a ton? I am just about ready to buy, all i need are the rods and pistons, but i need to know what seems to work out well before i do this. Also, how is valve clearance with this setup? I would imagine releifs in the pistons would be needed? Thanks to anyone who can provide some answers.
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I know most of you guys arent going to know this, but cmon someone has to be able to help me out, i know there has to be a few of you guys that have this done now.
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the wrist pin location is a couple mm diff in height, from the top of the piston, so your only option is 2.4 overbores. these motors hav a zero deck height. if you used 2.3 pistons, they would either go way past the deck or not even come close to it. i forget which way the diff is. not good noe the less.
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exactly. and you will have an easier time getting 2.4 overbore pisotns than you will a good 2.3 piston.
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thanks thats kind of what i was thinking anyways, anyone know where to get a set of pistons in that large of an overbore?? Could i just call say, wiesco and ask them if they can do it?? Or does someone know firsthand if they can be had without costing a ton more than typical forged pistons?
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They cost the same price. Check Carcustom. Karo can get them easily.
The 2.3 pistons will hit the head with the 2.4 rods UNLESS you grind the bottom of the rod and redo the hole. It's another option and it can cost alot less than buying pistons.
You COULD grind the top of the 2.3 piston but it will be weak.
Gilles
2.3 Ho
Nah ill pass on that
, I had hoped Karo could, but hadnt asked him. Thanks guys, tax money will be in hand soon
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Can all 2.4 blocks be over bored that much or do you have to have the block sonic checked? What is the minimum wall thickness needed on the thrust side with a 3.62 bore?
2000 Z24 5spd header & catback for now.
he is using a 2.3 block with a 2.4 rotating assembly. the 2.3 has a larger bore than the 2.4
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spin1r6 wrote:he is using a 2.3 block with a 2.4 rotating assembly. the 2.3 has a larger bore than the 2.4
that's where 2.4 overbore pistons come in
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I remember reading a tech article from Kit Car about building a 2.3/2.4 hybrid engine by Mark McPhail stating that the best combo was to use the 2.4 block & crank because it's stronger and the 086 head because it flows the best.Also if the block is sonic checked and is .230 on the thrust side it can be bored to the same size as a 2.3 or 3.62". This is the engine I plan on building and I'll just go to Wiesco or JE and have custom dished pistons in the oversize, compression height etc that I need.
2000 Z24 5spd header & catback for now.
a 2.4 block can not be bored out to be as big as a 2.3 block that has been bored out...and i remember that article that your talking about...
but for anyone interested in this hybrid combination here is a good
read
mesra wrote:a 2.4 block can not be bored out to be as big as a 2.3 block that has been bored out...and i remember that article that your talking about...
but for anyone interested in this hybrid combination here is a good read
never say never, dependant on what you want to do with the engine and how much core shift there is in the block it is quite possible. however wouldnt reccomend it for boosted or nitrous applications as you would probably blow the cylenderwall out of it...
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** Flat Broke Racing Inc.**
So what's the max bore you can do on a 2.4 block for 15 - 18 psi of boost .040?
2000 Z24 5spd header & catback for now.
The 2.4 bottom with the 2.3 valvetrain is not the best combo. Those who say the 2.3 block and crank is "weaker" than the 2.4 are full of sh****.
Gilles
2.3 Ho
Mfk-223 wrote:The 2.4 bottom with the 2.3 valvetrain is not the best combo. Those who say the 2.3 block and crank is "weaker" than the 2.4 are full of sh****.
I most definitely agree.
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well really you are taling about the stroker, 2.6 when you take the 2.3 block bore it over 0.03 us the 2.4 crank, and rods and pistons, there are a few inerit prober here though compression becomes very high the 2.4 crank as to be modded tor the oil pump, there is a brop aswell of where the cps will be caue unless they put a external cps, you will have to adjust the the pulles and then there is the prob with the relucter ring,
trs is working on these issues right now, hopefully they will have it reday soon, there are still working out som stuff, there is alot of machine invloved in this, to make this work, and high boost it still a bit unsure most recomend 12 psi i want to go more, but we will see what happens, and if i am not mistakes the 086 head of the 2.3 ho is niot a straight swap to the 2.4 block, the colling holes and @!#$ dont line up i am not sire if there is a adaptor plate or not but if there is let me know,
the safe messure is usally to over up to 0.04 and leave it at that but i have heard of going more never seen it though stock rods 2.3 are good to atleast 300 hp, i am undecided if i am goign to go with the stroker, or stright 2.3 over bore i dont know yet still a it unsure
^ Yes you have to have the coolant holes modified to match. There is no adapter plate, just machine work. And you use a 2.3 head gasket.
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is there a ewbsite where i can see this plate or what is the cost? what diff will it make in the hightfrom the block, will i have to compensate for it with compression is there nay issue with strees or flex in that plate as for as you have heard , especailly for high boost ???? i like the 2.4 block blancing shafts are probs but that can be taken car of, 086 head is wicked, bored out i think, best it can be is a 2.5 but still good, i would love a longer stroke, but i think it will be better for higher boost, also my recent experience with quad fours has kinda turned me off them, is there any other things that need to be adapted for this to work ??? also then i would love to ue the W41 cam and ECU, can the gettrag bolt up to the 2,4 block ??
you know what my bad i was excited for a sec, how does the machining work if it to the head or the block or both
