K24 or K20? To swap or not to?

[bigbdogbr]

I don't know if this is the correct place for this thread, but it does have to do with FI. So anyways, I plan on turbo'ing the car down the road when Hondata releases something for the car. In the mean time I'm doing other things to get the car ready. This is were I'm stuck.

My friend drives a 04 turbo'd RSX-S and blew his motor 6 months ago. He got a K24 swap when he decided to re-build the motor. I drove his car recently and loved the amount of torque he now has. I was considering doing the same swap for my 07 Si. My question is, is it really worth it? Should I get the swap and build the K24, or should I build my K20 and bore it out to 2.1? Anyone here have any advice? I did a search but couldn't really find any helpful threads. Thanks in advance!

[02civicsi]

As the saying goes "There's no replacement for displacement"

If you can get hands your on a K24A2 then use the bottom end of it, install the head off the K20Z3 w/'06-'07 TSX cams. Then when you boost down the road you'll be killing alot of cars. I have a friend who used to have a S/C K24A2 in an EP3 it was a total sleeper.

[Supercharged]

Originally Posted by 02civicsi

As the saying goes "There's no replacement for displacement"

If you can get hands your on a K24A2 then use the bottom end of it, install the head off the K20Z3 w/'06-'07 TSX cams. Then when you boost down the road you'll be killing alot of cars. I have a friend who used to have a S/C K24A2 in an EP3 it was a total sleeper.

Can this be done without tuning? the K24A2 bottom and K20Z3 Head with TSX cams? if so what kinda gains would you see? and would that change the Rev limit? or would it still be 8k rpms?

[LiL Sang]

^^ I believe you can if you buy stronger rods, pistons, and etc....

Also, why would you want 06-07 TSX cams if you're going to boost it?? Wouldn't you want a F/I cams instead?

[CanyonDriver]

Originally Posted by LiL Sang

^^ I believe you can if you buy stronger rods, pistons, and etc....

Also, why would you want 06-07 TSX cams if you're going to boost it?? Wouldn't you want a F/I cams instead?

[Supercharged]

I was just saying for N/A folks that guy wants to go F/I

[Supercharged]

What kinda gains would you expect to see with that setup? minus the F/I

[xxmstajxx]

what exact car does the k24a2 come from?

like what year did it first come out and when did honda/acura stop making them??

[xxmstajxx]

wow check this out........

eBay Motors: 04 05 06 07 ACURA TSX 2.4 K24A2 ENGINE (item 110243470204 end time May-14-08 15:47:55 PDT)

[bigbdogbr]

Originally Posted by 02civicsi

As the saying goes "There's no replacement for displacement"

If you can get hands your on a K24A2 then use the bottom end of it, install the head off the K20Z3 w/'06-'07 TSX cams. Then when you boost down the road you'll be killing alot of cars. I have a friend who used to have a S/C K24A2 in an EP3 it was a total sleeper.

The shop I'm talking to has the engine avaliable. As mentioned in another post, I already have different cams, ect. that I'm going with in order to be ready for boosting down the road. I'm assuming you think I should go for it then?

Like another poster pointed out, tuning might be an issue. If I decide to swap I think I'll have the shop build the K24 then when an EMS comes out I'll go in and do the swap at that point. Decisions, decisions!

[bigbdogbr]

Originally Posted by Supercharged

Can this be done without tuning? the K24A2 bottom and K20Z3 Head with TSX cams? if so what kinda gains would you see? and would that change the Rev limit? or would it still be 8k rpms?

Your torque is going to definitly take a jump up. I couldn't tell you exact figures but you can feel that it's there. The rev limit would I believe lower. At least in my friends RSX it got lowered to around 7500 I think. Have to double check with him.

[xxmstajxx]

I dont understand....how does a k24a2 bottom end make a Si better????

there rated at 200hp 166 tq stock???

So a Si top end K20z3 + a TSX Bottom End K20a4 = what????

What makes the TSX bottom better?? What about tuning?

[Asif22]

^ We get tq...and a good free flowing head...But would it still be able to safely rev as high? A longer stroke is what gives it the tq but takes away 8k redline I think i'm not sure though...I read it somewhere and it kinda makes sense.

[xxmstajxx]

hmmm i love my redline......

so what are we talking here 7.5k 7k 6.5k redline

[REVOLT]

to hell with that stuff, just save the hassel of the swap, take money ur gonna pay for the block and just hook up the k20z3, bcuz like it or not that little 2.0 packs a good punch and with alittle love and attention u can still see the same figures ur gonna get with the 2.4, but hey thats just my opinion?

[CanyonDriver]

Originally Posted by REVOLT

to hell with that stuff, just save the hassel of the swap, take money ur gonna pay for the block and just hook up the k20z3, bcuz like it or not that little 2.0 packs a good punch and with alittle love and attention u can still see the same figures ur gonna get with the 2.4, but hey thats just my opinion?

agreed. i say build your stock bottom end for boost. cosworth low comp. pistons, forged rods, forged crankshaft, stronger cast iron sleeves (depending on how much boost you plan on running), etc.

[07CivicMD]

If you want the best of both worlds. Get a K20 Sleeved block for ERL and get a stroker 2.3 liter kit like Blue's doing. With a finished head you still can rev to 8.5 - 9k rpm and get the lower torque.

[rcracin13]

^^^ that's going into a full engine build.

we all most like revving high because that's where our z3's make most of its power.

with a k24a2, your powerband changes so you wont need to rev that high. no big deal if we can rev to over 8k. take the k24a2 to about 7500 and you're good.

i used to rev my b20/vtec with a stock bottom end to 8k very very often. it never blew on me but i wouldnt expect it to last very long either. (i sold it)

start off with a stock k24a2 and see how you like it. if you want to do engine work, go for it afterwards.

[LiL Sang]

^ +1, with K24a2, you won't need to rev that high anyways. There's power throughout the whole powerband. Unlike a stock K20z3, you won't be needing to wait till vtakk kicks in at 5,800rpm.