ITR Head on Stock B18C2 Bottom

[squish85]

Hi all,

I've recently came across a good deal on a JDM ITR Bare head that has been further ported and polished and machined by 0.7mm to achieve 12.3:1 CR. I also have a good deal on a set of EK9 cams and gears, retainers, springs etc..

I was wondering if the stock bottom end of the B18C2 could handle such a configuration safely up to its 8200 rpm limit..

The combination of mods are as follows:

JDM ITR Head Pnp + skimmed 0.7mm ~12.3:1 CR (Quoted from seller)
JDM EK9 Cams
JDM EK9 Cam gears
JDM EK9 Retainers
JDM EK9 Springs
AUDM DC2 VtiR Bottom End (B18C2)~ approaching 190k+ kms

Also throwing in a Spoon high compression head gasket (2ply)

Be great if anyone could offer some advice on this set up

Many Thanks

[martin]

i dont think the itr head will fit because of some p72 or p73 head thing they dont match and also ur basically pulling apart the motor already so might as well do bottom end

[bennjamin]

b16a2 head can fit onto the b18c2 block , and b16a2 shares similar/same head as the b18c7 - if that means anything.

[lil_foy]

Its the intake manifolds that dont line up between vtir and all other b series.

The head will bolt up fine.

[squish85]

Does that mean that all i need is a ITR IM + TB ?

[lil_foy]

Well your vtir manifold wont bolt up to the itr head.

So yes you'll need a new manifold.

Im not 100% sure on the t/b but id upgrade anyways since you're getting bigger cams and a higher flowing head.

[dsp26]

you won't get the 12.3:1CR on a B18c2 block.. b18c7 has higher compression because of pistons... but you'll be above 11:1CR

[squish85]

Thanks for all the inputs so far guys... Besides the fact that I need a new IM +TB and possible intake hose and box ...

But my main concern is ..whether the Stock bottom end of the B18C2 take this much higher compression ? Its typically going from 10:1 to 11:1CR or more .. As far as i know it, the bottom end of the vtiR is not forged and not as strong as the internals of a ITR..

[TODA AU]

B18C2 + B18C7 head = -0.2:1 C/R (With std bottom end)
Machining 0.7mm off head brings the comp up by approx 0.72:1 C/R
With the addition of the 2ply gasket, you should just make it to 11.0:1 C/R.
For best results,
You will need adjustable cam pulleys to correctly set the camshafts.
(They will be significantly retarded as described & this will result in poor output)
There is too much material removed from head & gasket to ignore.
Also, if you decide to go bigger in the cams at a later date, you'll need to be extra careful with piston to valve clearance.

[squish85]

Clear info given there Adrian .. Thanks ..