Ok, call me a noob all u want. I looked in this whole forum, all 3 pages, and didnt see anything covering this, so I have to ask. rsx-s 200 hp. civic si, 160 hp. both 2.0 K motors? why the 40 hp diff? well, not why, but how? what is so different on the rsx that yields the extra 40 hp? is it a different motor? different fuel stuff? curious cuz i might be gettin my hands on a motor from an si, but 40 hp is 40 hp

 

its all in the head. the Si has a crap *** VTEC that I won't get in to, but the RSX S has the VTEC we are used to, and the i part is like electronic adj. cam gears constantly adjusting the cams for optimum power/ fuel economy.
The RSX S also has a sligtly higher compression ratio;
SI I think is 9.8:1 ish and the RSX S is 11:1.
Other things like a better exhaust manifold also contribute to the power diff.

 

i see. thanks for the reply. now, that said, <U>are the heads easily interchangeable</U>? or, interchangeable at all? im not worried about the exhaust manifold, cuz i'd have to get a custom header anyways.

 

There are a few people who have switched the heads and got a computer.

It's not as easy as you think, and you'll need a computer. You also will not have exactly the same HP as the Type S unless you also do a few other things.

There have been a few discussions about it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thapimpfromchi &raquo;</TD></TR><TR><TD CLASS="quote">Ok, call me a noob all u want. I looked in this whole forum, all 3 pages, and didnt see anything covering this, so I have to ask. rsx-s 200 hp. civic si, 160 hp. both 2.0 K motors? why the 40 hp diff? well, not why, but how? what is so different on the rsx that yields the extra 40 hp?</TD></TR></TABLE>

Esentially the RSX and Si motors are made for economy white the Type S motor is tuned for performance.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thapimpfromchi &raquo;</TD></TR><TR><TD CLASS="quote"> is it a different motor? </TD></TR></TABLE>

might as well be, yes.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thapimpfromchi &raquo;</TD></TR><TR><TD CLASS="quote">i might be gettin my hands on a motor from an si, but 40 hp is 40 hp</TD></TR></TABLE>

and you will notice a difference in price because of it

 

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

It's not as easy as you think, and you'll need a computer. You also will not have exactly the same HP as the Type S unless you also do a few other things.

There have been a few discussions about it.</TD></TR></TABLE>

do a few other things like what? if i do get this motor, and go through with the whole swap, i want to get as much power as i can from it. i mean, its no cheap swap to begin with, so i might as well spend some more money and get the most i can from the engine, cuz i dont think i have enough room to turbo it in my car.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thapimpfromchi &raquo;</TD></TR><TR><TD CLASS="quote">do a few other things like what? if i do get this motor, and go through with the whole swap, i want to get as much power as i can from it. i mean, its no cheap swap to begin with, so i might as well spend some more money and get the most i can from the engine, cuz i dont think i have enough room to turbo it in my car. </TD></TR></TABLE>

Like bump the compression with different pistons or flat-topped valves or head-milling (although I don't suggest the latter). What car are you putting this in that leaves you no room to turbocharge it?

 

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

Like bump the compression with different pistons or flat-topped valves or head-milling (although I don't suggest the latter). What car are you putting this in that leaves you no room to turbocharge it?</TD></TR></TABLE>

Not to mention the smaller things like extra oil squirters. By the time you have done all of this you have spent at least as much as you spend for an a2 and it wont be as reliable. Although Chunky would say otherwise, the only good thing to do with an a3 is FI.

 

judging by your sig im gonna guess you want to put a k into an ef? if thats the case then theres alot of stuff that will need to be done. but to answer your question of what else needs to be done to bridge the 40 hp gap i other than the head is probably the comp ratio. the higher ratio combined with all around better airflow and the computer tweaks to accompany should net the 40 hp difference between the two

 

i see. thanks again for all the info. its not for sure at all. it is a possibliity. i just figured i'd get some research done before i go any further with anything. and, yes, i was thinking about putting it in an ef.