im talking about the tsx k24 head and the rsx's k20 head

iv been reading about how people want to put rsx heads on tsx blocks

now i understand they want the 2.4 liter engine, but why put the rsx head on there, why not just leave it alone, or port and polish and mill the stock k24 head

tsx's have the ivtec on both intake and exhaust sides, correct?

so am i missing somting, i thought the rsx head didnt have any work done to it internally

why not just put a straght k24 in and do work to that


thanks for any info


and i did search but didnt find any answers to my question

 

yes you are missing something. the throttle is controlled differently on both motors. on a TSX it's electronically controlled and on a rsx it's not.

 

well most people whoudlnt put the motor in with the stock intake mani and throttle body

most whould put the itr intake mani and throttle body on before the swap

so with the itr intake mani and throttle body there whould be no problem right?

 

I'd like to know also.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 01-0720 &raquo;</TD></TR><TR><TD CLASS="quote">well most people whoudlnt put the motor in with the stock intake mani and throttle body

most whould put the itr intake mani and throttle body on before the swap

so with the itr intake mani and throttle body there whould be no problem right?</TD></TR></TABLE>

for the most part, yes there would be no problem. Although the K20a and K20a2 mani's do not bolt up to the TSX head. There is a small coolant passage that needs to be dealt with. Personally I would say the best option is to use the JDM Euro R mani, since it has the coolant passage on the flange and it flows better than the K20a mani anyways... The only problem there is that none of the OEM throttle bodies bolt directly up to the Euro R or TSX mani (except the drive by wire throttle bodies, which can not be used in any other car).

and as far as your original question goes, there is no point in putting an RSX K20 head on a TSX motor. The only real differences in the head are the cams, which the TSX Intake cam I believe is actually a little more aggresive than the RSX. and the ports are different, the TSX intake port I believe is smaller and flows better in terms of producing torque. with the RSX head or a ported TSX head you would probly make a little more horsepower but your torque will fall off a little sooner.
The TSX motor is one of the only motors made by Honda that produces torque, so why go and take away from that?

K24a2&gt;All

 

well, i was planning on doing a head swap....putting a k20a2 head on my k20a3......are you saying i should put a k24 head on instead of the k20a2?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nos4a2si &raquo;</TD></TR><TR><TD CLASS="quote">well, i was planning on doing a head swap....putting a k20a2 head on my k20a3......are you saying i should put a k24 head on instead of the k20a2?</TD></TR></TABLE>

No. For a head swap on the K20A3 then the A2 head is the best bet. Its just that there is no real point to swapping heads on the K24A2 (TSX).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aznbo1626 &raquo;</TD></TR><TR><TD CLASS="quote">yes you are missing something. the throttle is controlled differently on both motors. on a TSX it's electronically controlled and on a rsx it's not.</TD></TR></TABLE>

poster said HEAD not THROTTLE BODY....all you have to do is switch those...

 

I know this is a little off topic, but I was thinking of doing the a2 swap for my a3. I have heard that the a2 head is really hard to find, and when you do theyre expensive.. will they get MORE expensive when the RSX goes out? meaning, should i find one now regardless of how expensive it seems "now"?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chad &raquo;</TD></TR><TR><TD CLASS="quote">

poster said HEAD not THROTTLE BODY....all you have to do is switch those...</TD></TR></TABLE>

Yah but there is no OEM "BOLT ON" combination of Intake mani and throttle body that will work with the TSX head. So somthing has to be modified, whether it is the TSX head and the collant passage, putting the extra coolant passage on the K20 intake manifold flange, or just modifying the OEM TSX or (PRC) Euro R mani to accept one of the OEM K20 throttle bodies...

 

the heads are basically the smae, as with the k20r head too. the only difference is that you have to make somekind of an alteration to the TSX head to accomade aftermarket valce train, which i was told wasnt that expensive. but you can thread the coolant passage and put a 90 degree fitting there and run a line to some place on the head (cant remember quite where, but check k20a.org, there is a thread). also if you are going to run the euro r manifold, there is a company making adapters for the throttle body, (also check k20a.org for this)

 

2 minor differences

Intake ports


and the TSX head has a water port that needs to be plugged, rerouted or welded although most people do not agree about welding it shut...



here's a product hasport is going to be selling

 

[B]ONE MORE IMPORTANT THING YOU NEED TO KNOW IF YOU ARE PLANNING ON USING THE TSX HEAD, IS THAT

"If you are planning to run aftermarket cams, the spring seats all need to be changed to have dual valve springs and this means replacing the spring seats aswell as all the seals."

The cost of these parts are like $10-$20 but installing them, is another story. The head needs to be taken off the motor etc.,.., So save yourseld the hassle if you have a tsx head and do this while the engine is out the car if you are thinking about running big cams in the future...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nikos &raquo;</TD></TR><TR><TD CLASS="quote">The cost of these parts are like $10-$20 but installing them, is another story. The head needs to be taken off the motor etc.,.., So save yourseld the hassle if you have a tsx head and do this while the engine is out the car if you are thinking about running big cams in the future...</TD></TR></TABLE>

Another thing to add to the list...

hey Nikos you don't know where i could find an RSX intake cam for a decent price do you?

 

More info:

as of right now, July 18 2005, all USDM K series motors have i-VTEC on the Intake cam only. The VTC (as of now at least, maybe upgrade in the future..?) is only on the Intake cam on the TSX, RSX, CR-V, Element, and Accord K-series engines.

Advice: The TSX motor is the bomb. Get it port and polished and a good header and ported to match, cause the outer exhaust ports sorta arent totally straight comin out of the valves.

 

the reason people are putting the type R head on the tsx, is because of the aggressive cams and the bigger ports on the k20a head. other wise people are putting S and R heads on a k24a1 or a4 because they do not have full vtec. the have the intake side of vtec... also the degress is going from 25 with the tsx and 50 with the type S or R head, but with a k24 it is not reccomended that it goes over 45 degresss unless you change the valves