B20b bottom end + B16 Vtec head

**RSA_Honda** · 28-02-2006 04:50 PM

Hi Guys

I have tried the search option , but unfortunately i didnt get the answers to the questions i have

From South Africa , so our resources are a bit limited when it comes to Honda experts , thus the question here ..

I have a b20b bottom end, to which i want to fit my b16 Vtec head. In theory i dont see a problem with this , but i have picked up that the B20b has a fairly low compression ratio.

Does anyone know the compression ratio that the engine will be after the B16 Vtec head is fitted to the B20b ?

Also, if the ratio is a bit low for decent compression , what ratio can one run on the above setup - reliably ?

Thanks a million in advance for the help

**j-specAccord** · 28-02-2006 05:28 PM

the compression is low because of the piston size and the stroke, if you do the B16 head swap then you should also buy higher comp pistons.
i am not too familiar with the comp ratio of the B20 but i am assuming it would stay the same ratio once the head is fitted since B series heads are very much the same.
i do not know alot about the B series engines, there are alot of ppl on here that do. hopefully you get point in the right direction.

**RSA_Honda** · 28-02-2006 05:34 PM

Thanks :-)

Yeah , i was thinking as well that i need to change the pistons, but want to make 100% sure before i go all out and spend a lot of cash on importing the stuff

**LowEk** · 28-02-2006 06:22 PM

ask tinkerbell as he has this conversion already. he knows what he is talking about too.

**RSA_Honda** · 28-02-2006 06:29 PM

Thanks LowEk, i have sent him a PM yesterday, just awaiting he's reply

**BryanE** · 28-02-2006 09:09 PM

Search it @ google.com dude and type it B20 vtec... or go to www.b20vtec.com

**SKREMN** · 28-02-2006 09:40 PM

I have completec the conversion with my car
I destroked mine with a ITR crank and got high comp CP pistons driven by crower rods
I also got the block sleved but this is not a must do

**BiGANG** · 28-02-2006 11:34 PM

Originally Posted by SKREMN

I have completec the conversion with my car
I destroked mine with a ITR crank and got high comp CP pistons driven by crower rods
I also got the block sleved but this is not a must do

wouldnt it have been easier to start with a b18c in the first place if you were always planning to destroke it? Just wondering why u did it like this.

Also where did you get ur sleeves done?

**barefootbonzai** · 28-02-2006 11:46 PM

when he says destoke he only means like buy a tiny bit like 0.05L or so cause of the type r crank. In order to complete you b20 swap you'll need a vtec conversion kit. Just search ebay, eagle make them.