Here is the how I got the K20a2 cams to work on the K20a3 head. You need the K20a2 cams (or type-r, tsx, crower...), K20a2 rockers and pins, and k20a2 rocker shafts. The pins in this picture are how they come in the A2 head

You have to switch the pins in the left and middle rocker like this picture

This locks the left and middle rocker together so that the middle rocker will not bounce around due to the cylinder head not having the lost motion spring.





This makes the left valve always ride on the vtec lobe and the right valve rides on the non-vtec lobe. When vtec is engaged by the solenoid it locks all three rockers together the same way the factory does and you have a regular working vtec.

 

dude... how much would it cost me to have you do it for my K20A3 in my EP3...

 

Genius! Is that it? Or do we need kpro and other parts?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by korean &raquo;</TD></TR><TR><TD CLASS="quote">Genius! Is that it? Or do we need kpro and other parts?</TD></TR></TABLE>

do we need kpro?

 

you will need Kpro

 

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

Thank you

So this would actually allow for i-vtec engagement instead of the measly vtec-e engagement?

 

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

So this would actually allow for i-vtec engagement instead of the measly vtec-e engagement?</TD></TR></TABLE>i-vtec = vtec + VTC, so the A3 already *has* that. You mean exhaust and intake cam vtec (a2) versus just intake cam vtec (a3).

 

so wait - just to clarify things up here - both the A2 intake cam and exhaust cam can be installed into the A3? If that's true, why not just by an A2 head swap?

 

Why buy the whole head when all you need is the cam?

 

u need more than just the cams to get rid of the clearance issues the A3 has with the rocker arms and the lost most assembly spring (as stated above) will cost almost the same as buying the A2 head if u buy everything new from the dealership because it's kinda of hard finding those parts for cheap!

 

Ask Jeremy.

I'm no genius

 

It will work with stock cams but not with aftermarket

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nikos &raquo;</TD></TR><TR><TD CLASS="quote">It will work with stock cams but not with aftermarket</TD></TR></TABLE>

Just curious, why is that?

 

thats a little cude (having one valve vtec'd all the time) but WOW, what a great mods for you a3 guys.

Rich

 

if you really analyze things closely, it is a great mod (almost like a breakthrough). However, there seems to be a downside to it also like money-wise as well as the difference between this and the A2 head-swap! I'm still trying to figure out if this would be as disappointing as the head-swap!

 

only problem with this is long term ...

noone knows "YET"

 

has someone did it and driven is already??? vtec pop ?? havent seen anything like this on ephatch yet

 

Subscribed to see this develop --

 

You can either put type-s springs and retainers or use aftermarket titanium retainers and dual valvesprings. I used inlinepro titanium retainers and dual valvesprings in mine because I plan on reving it to 9k with the turbo set up.

I started out with the k20a2 kal in the hondata and tuned it from there. It was very easy to tune and only took about an hour. It was just as easy to tune as any other k-series. It liked having the vtec set really low. I started out at 4900 and ended up at 3500 because thats where it made the most power.

 

up for more info

 

Hmm, I wonder what it would take to get LMA's to fully work on the a3 head... or am I a few years behind?

Rich

 

if anybody needs the cams im me i have a set

 

although, to make the extra power you have to revv way past the stock a3 redline. sounds like supporting internal mods are required to run this setup safely.

 

bump for more info

 

Most likely it would be beneficial to add stronger valve springs. they are usually whats used with hondata on the k20a3. the s2000 valve springs would probibly do the trick. I'm sure aftermarket valve springs would work as well.