Some intake and heads notes and rectifications

[morgie]

I think i messed something up.

I took pocession of a complete 1996 WRX engine, plus a 2002 WRX intake manifold and intercooler. (i realy didn't paid much - 50$...)

First of all, the WRX intake manifold is equipped with thumble Generators. We don't have the electronic to drive them ! ..

Second, the bold pattern is not the same at all. the 4 bolts are offset, as on our Ej22T.. (but wider). That's the point i dont understand, sice i compared the STI2 gasket with a WRX02 gasket at my dealer, and they were the same, and the STI2 gasket is the same as the WRX96 one .. my dealer should have took the wrong gasket when giving me the wrx02 one... nyway

WRX02 intake. notice the thumble generator and the bolt pattern


WRX96 intake. notice the bolt pattern



So if you want to mount WRX02 intake, you MUST have the corresponding WRX02 Heads, and find a way to disable the thumble generators (removing the plate maybe)


The WRX02 Throttle Body is 2.5" thick. The WRX96 one is 3.5" thick, and it's thight to fit the WRX02 intercooler. The WRX02 Throttle body will bold on the WRX96 manifold, but there is a hole left by the IAC derivation holes. Some customising need to be done there.. This swap gives 1" of extra space to fit the intercooler.


The hole left by the IAC.



The WRX96 heads (the ones with 2 bolts coils) seems to have a .. humm... less bigger volume difference.. may not require piston swap (i'll have to measure the chamber volume)





All the pics and HiRes can be found at these urls.
http://public.fotki.com/morgie/morgie/o ... ntake_mix/
http://public.fotki.com/morgie/morgie/o ... x_96_dohc/
http://public.fotki.com/morgie/morgie/o ... de_pieces/

[Legacy777]

Good notes morgie.

I personally don't think the MY02 WRX heads are too viable an option, simply because of the tumble valves. I suppose you could remove them, but there's something that just doesn't seem like it would be as good as running the proper type intake manifold.

[mikec]

Whats the point of these tumble valves? I've seen them mentioned on NASIOC before, but was never sure what they are.

Oh! Sorry to get off topic... Good stuff morgie!

[morgie]

Those are for fuel economy and pollution... They should help making a better fuel mixture. They are found on our WRX and STI.

[JasonGrahn]

Whats the point of these tumble valves? I've seen them mentioned on NASIOC before, but was never sure what they are.

More info: http://www.spdusa.com/driving_the_wrx_engine.htm

[morgie]

The only reason i wanted to try the WRX02 intake it's because it gives more room to install a TMIC, and it allows the use of top fed injectors, wich are cheap to find in 550cc format. (harder to find 550cc side-fed injectors).. but this is not a good idea after all. :\