whats the max bore you could do on a k20?

[v1c10us]

I saw a picture of a car labeled mugen RR and it had a k motor in it but the badge on the motor said 2.2
I think a k20a2 bored to 2.2 liters revving over 8k would be pretty sick
edit: and yes I know it would be easier to just get a k24 and do some valvetrain modification and rev to the same amount

[Chazwick05]

no need to bore, you could just use a different crank and stroke the motor. there are a number of different stroker kits, or you could always modify the snout on an s2k crank to make it work with the k-motor and get a 2.2 that way.

or you could destroke a k24, that's another option

[Lucid Moments]

To get a 2.2L you are going to have to go out to 90mm (2188 ccs) with the stock stroke. That can be done with aftermarket sleeves, but I've heard that head sealing issues can become a real issue with sleeves that thin. Most places recommend 89mm max bore and that is only going to yield 2140 ccs.

[talonXracer]

It is bored to 89 mm and the crank is modified for more stroke. Also remember that Honda has a penchant to overstate the actual engine capacity, ie, if the actual capacity is 2101cc they call that 2.2L as it is larger than 2.1L.....

They also destroke the K24 block to attain the 2.3L that is used in the RDX turbo and several builders do the same to build a more comfortable rod stroke ratio for a high RPM screamer.

[RedSiBaron]

is the k24 motor square bore/stroke like the k20 is? if it is, id personally go for destroking the k24 to end up oversquare and scream the thing...

[Bificus]

the k24 is 3.4x3.9 and the k20 is 3.4x3.4

[Kodeen]

You could always get a K24 then bore it to a 2.7 liter.

[talonXracer]

the k24 is 3.4x3.9 and the k20 is 3.4x3.4


LOL, Still stuck in the past with inchs

86mmx86mm for the K20 and 87mmx99mm for the K24

[Lucid Moments]

is the k24 motor square bore/stroke like the k20 is? if it is, id personally go for destroking the k24 to end up oversquare and scream the thing...

The K24 is 87mm bore by 99mm stroke. Destroking it is still a good idea though. I wanted to do that, but it fell through.


the k24 is 3.4x3.9 and the k20 is 3.4x3.4

I may have just repeated what you said, but I don't know cause in motors I think in metric.


You could always get a K24 then bore it to a 2.7 liter.

Hmmmm..... My motor is bored out to 89mm and that only gets you to 2464ccs. In order to hit 2700 ccs you would have to stroke it as well and that is just getting silly.:mbiggrin:

[talonXracer]

For a 2.7L K24 you would need offset the bores and that has been proven to not work very well.

[Kerby]

how about the crower stroker kit. 2.7. $3K plus though :cry:

[Lucid Moments]

For a 2.7L K24 you would need offset the bores and that has been proven to not work very well.

Didn't Ron get a stroker crank done for the K24 that was around 109mm stroke? Cause if you paired that with a 89mm bore you would get 2712ccs.

[davisj3537]

I saw a picture of a car labeled mugen RR and it had a k motor in it but the badge on the motor said 2.2
I think a k20a2 bored to 2.2 liters revving over 8k would be pretty sick
edit: and yes I know it would be easier to just get a k24 and do some valvetrain modification and rev to the same amount

:nono:

[talonXracer]

Didn't Ron get a stroker crank done for the K24 that was around 109mm stroke? Cause if you paired that with a 89mm bore you would get 2712ccs.

Hmm, that probably required alot of block relieving. And with that stroke it wouldnt be a high revver, the piston speed would be ungodly! LOL

[RedSiBaron]

ahh k, so the little whore of an engine is under square grr...so pretty much destroking a k24 is going to have the same effect as destroking a k20, cept using the k24 head is a better plan i take it? i mean does the the k24 head flow better or is it just just playing with combustion chambers...newb k24 questions here, but im just to the point where i need to be learning the k series inside and out...

[Lucid Moments]

The other difference is that the K24 has a different deck height (19.7mm taller) which can give you some advantages in r/s ratio and stuff like that with a destroked motor. Of course with destroked K24 you also end up with a longer (and thus heavier) rod so your rotating/reciprocating mass goes up too.

I don't know of anyone that has actually done a destroked K24 yet so I don't know for sure which would work better.

As for the head question. The K24A1 head can be made to flow fairly well, but IMHO it still limits you. And even when it does flow well it is still only as good as a stock K20A2 head. A K20A2 or K20Z3 head is still your best bet for a variety of reasons.

[talonXracer]

There are several destroked K24's out there with the S2k crank. 2240cc of very high rpm screaming VTEC.

[RedSiBaron]

The other difference is that the K24 has a different deck height (19.7mm taller) which can give you some advantages in r/s ratio and stuff like that with a destroked motor. Of course with destroked K24 you also end up with a longer (and thus heavier) rod so your rotating/reciprocating mass goes up too.

I don't know of anyone that has actually done a destroked K24 yet so I don't know for sure which would work better.

As for the head question. The K24A1 head can be made to flow fairly well, but IMHO it still limits you. And even when it does flow well it is still only as good as a stock K20A2 head. A K20A2 or K20Z3 head is still your best bet for a variety of reasons.

ah that makes sense...cant have a efficient screamer motor with a heavy rotating assembly heh...

...hmm evil thoughts are brewing...

...destroked over square k24 block, k20 head...

...hmm...

...how you think that would do in a 1200lb car? hahaha :mangel:

[Lucid Moments]

There are several destroked K24's out there with the S2k crank. 2240cc of very high rpm screaming VTEC.

Yea, thats what I wanted to do, but.... I just haven't heard of any of them. Are they all over on K20a?

[Bificus]

LOL, Still stuck in the past with inchs

86mmx86mm for the K20 and 87mmx99mm for the K24

Dohh

[talonXracer]

Yea, thats what I wanted to do, but.... I just haven't heard of any of them. Are they all over on K20a?

Yeah there are several over there. ERL had posted up that that is an option they build as well.

[Lucid Moments]

Damn, I guess I'm actually going to have to go over there and look. I quit going over there cause Nikos pissed me off.

[Draw7Seven]

Man I wish I knew what you guys were talking about.

Actually I get some of it, but these are the threads that hurt muh head.

[v1c10us]

so in most of your opinions would it be cheaper/safer/more cost effective to destroke the k24 using oem parts? than to stroke an a2?
what would the revving capability be on a k24a2 that is destroked? I'm assuming the a2's bottleneck isn't the rod mass but rather the valvetrain so you wouldn't be able to rev any higher correct?
I really just want a 2.2 liter motor that revs fast enough to create its own magnetic field

[Lucid Moments]

This is just my opinion so take it for what its worth. I actually paid money out to have a destroked K24 built using the F22c crankshaft with custom rods. With an 89mm bore that yeilds 2257ccs. The builder flaked on me so it never got done but I was convinced then and still am that the bottom end would be capable of 10k.

Now you mentioned the head limiting you. None of this is going to be cheap, so if you do this there is no point in not upgrading the head too. In order to make power at that kind of RPM you are going to need a very good flowing head, and you are going to have to put some big cams in it too. A Custom header, free flowing intake and oversized valves would not be a bad idea either.

Just off the top of my head I would guesstimate that it would be a $10k+ project to do it right unless you have access to a high end machine shop and can do a lot of the work yourself.

[PAPITUYO326]

This is just my opinion so take it for what its worth. I actually paid money out to have a destroked K24 built using the F22c crankshaft with custom rods. With an 89mm bore that yeilds 2257ccs. The builder flaked on me so it never got done but I was convinced then and still am that the bottom end would be capable of 10k.

Now you mentioned the head limiting you. None of this is going to be cheap, so if you do this there is no point in not upgrading the head too. In order to make power at that kind of RPM you are going to need a very good flowing head, and you are going to have to put some big cams in it too. A Custom header, free flowing intake and oversized valves would not be a bad idea either.

Just off the top of my head I would guesstimate that it would be a $10k+ project to do it right unless you have access to a high end machine shop and can do a lot of the work yourself.
http://www.susansscrapbookshack2.com/forums/style_emoticons/default/yeahthat.gif