Vtec head on normal block?

[Olskool Integra Boy]

I want to stay NA.....
is it possible to replace a standard d16a head with a vtec one from say. . .
i dunno a dohc that fits, maybe a jap b16a? any help would be great.

[wynode]

no you can't put a b series head on a d series

[Weq]

I want to stay NA.....
is it possible to replace a standard d16a head with a vtec one from say. . .
i dunno a dohc that fits, maybe a jap b16a? any help would be great.

no a b-series head, but u can put a SOHC vtec head on from a d-series. this swap is called a mini-me (search honda-tech for insturctions) and will yeild a higher compression ratio + vtec goodness + better designed/flowing head + better intake manifold(if used also).. so yeah, plenty of gains to be had!

[crx_16x]

Weq he said d16a not y.

[tinkerbell]

Weq he said d16a not y.

huh? relevence?

[Olskool Integra Boy]

ok well thanks for the help but can i put on the 'mini-me' or not. . . . someone?

[Olskool Integra Boy]

btw its a DOHC engine so maybe that is 'the relevence' if i swap to sohc does that mean mass tuning or timing differences.

[wynode]

Do you have the D16a6/8 ?

If that is the case, then don't bother about the SOHC vtec swap as you will not see any noticable gains (if any!) and it is just plain not worth it.

The mini-me / SOHC vtec swap is only for those who have a SOHC non-vtec D series engines.

[Weq]

Acutually wyn, thats incorrect :)
the mini-me was started by people swapping off the DOHC heads for SOHC vtec heads. ANd you will gain power - for all the above reasons i said before. ur car will make a fair amount more power then a normal SOHC vtec or DOHC non-vtec D-series. ALL d-seres heads are interchangeable. u cab put d16 heads on d15 block even. Most of the differences in capacity are due to the difereneces in bore & stroke.

[wynode]

Acutually wyn, thats incorrect :)
the mini-me was started by people swapping off the DOHC heads for SOHC vtec heads. ANd you will gain power - for all the above reasons i said before. ur car will make a fair amount more power then a normal SOHC vtec or DOHC non-vtec D-series. ALL d-seres heads are interchangeable. u cab put d16 heads on d15 block even. Most of the differences in capacity are due to the difereneces in bore & stroke.
So given both the si and vti make 96kW and they both have the same bore and stroke.........does that mean i'll make more power if I put a SOHC-VTEC head on my d16a8 and used the vti ecu?

[Weq]

check's compression numbers...

well it seems, depending on head gasket and head (y8 or y1) u will gain around .4 to 1.0 on the compression scale. thats with stock bottom end, and stock head. Mill the head a little more and u will gain more. So add to that, a better flowing head design + intake manifold (if u go y8) u will gain some noticeable power. add an aftermarket piggyback etc etc and u will gain more.

[Weq]

http://www.knology.net/~jediklc/D.htm

compression calc

[wynode]

ok so not talking about milling the head and talking with OEM heads/headgaskets/intake manifold/SOHC-VTEC ECU, I don't see how the increase in compression will be gained if:

1. the bottom end is exactly the same
2. Headgasket is the same thickness.

Is not the difference between the d16A8 in my Si and the d16y1 (is it the y1?) in your vti simply the head and ecu ?

[Weq]

different combustion chamber volume
different piston dome displacement
different headgasket thickness ??? my info?
different piston to deck hieght


much more then just bore x stroke to compression

http://crx.honda-perf.org/articles/z6swap/z6swap.html

edit: to answer the question, pistons are different & head design is different.

[wynode]

Ok so they do have a different bore and stroke then? That's something new i've learnt!

My assumption was that if the bore/stroke and pistons were the same (IE same bottom end) then the only difference between the eg si and eg vti would be the head. Hence changing from a DOHC non-VTEC head to a SOHC-VTEC head would yield no gain.

However, they don't share the same pistons hence the difference!

So......if the vti pistons give a greater compression, what would happen if you use the vti (d16y1?) pistons in the d16a8? (no i haven't tried that calculator!)

:)

[Weq]

dunno really.. more or less. the squelch area's on the head surfaces are different, and i spose the pistons are designed to suit. but they are generally a very different block internally, with the few basic similiarties that make them d-series. the d16a shares more in common with a d15b beleive it or not.. same pistons!

[wynode]

Got a pic of the Da16y1 piston dome?

theres a pic ofhte d16a8 piston dome in the gallery (civic section)

[wynode]

OK sorry there is no pic........the pics in there were taken before the head came off

[Weq]

search p28 vs pm6 on google.

[crx_16x]

Acutually wyn, thats incorrect :)
the mini-me was started by people swapping off the DOHC heads for SOHC vtec heads.

Do you have any links to sites with this info on?

[TON32Z]

can u do these wid the Ek CXI motors

[Weq]

Do you have any links to sites with this info on?

http://crx.honda-perf.org/articles/z6swap/z6swap.html

scroll up

[egSi]

can u do these wid the Ek CXI motors


yeah im sure you can man.

[TON32Z]

im thinking of doin it but dont no skwat about it anyone an any threads that can help me...

i no heaps of people done it on EG's but anyone ever done it on an ek
and wat parts do i no besides thehead

[wynode]

EG and EK will be pretty much the same.

[Weq]

tonez, goto honda-tech and search mini-me. then head over to d-series.org and search. finally try google. u will get pretty complete howto guides.