Jc82187

What are the differences... i just recently pulled a d16z6 out of a 99 that was throwing a knock sensor code and want to put this motor into a 91 ef... what are the differences in the manifold if any?

HCivExoo

the Y8 manifold is a much better IM in my opinion. the major difference is the size of plenum.
I haven't seen any dyno tests done just for this purpose i am sure someone has done it before though.
Y8 IM is even better for turbo, the large plenum really helps then.

don't mind the Y5 manifold on the left. just know you don't want it.
and also the manual Y8 IM does have the cut out for the IACV on the back. and if you take your time you can drill out the holes for it if all you can find is an automatic model.

Jc82187

thanks alot for that....

phelpsj2

that is not a d16y5 manifold on the left.

Hogfan97

ok i have been looking at buying an intake and throttlebody for my car, how do i convert to the d16y8? please include detailed steps and photos if possible!

grumblemarc

iTrader: (4)

Convert from what? Vagueness is not helpful here. What are you trying to do?

HondaPartsHero

It might help to let us know what engine you have that you want to swap over manifolds to.

owneyboy

iTrader: (1)

SINCE THIS POST ROSE FROM DEAD I WILL GIVE YOU A FEW UPDATES ON NEW INFO
AND WILL TELL YOU THIS NOW there are only slight 2-5 hp gains over 5-6000 rpms the z6 manifold on HIGH horsepower applications. they only slightly change powerband :top end low end power. the bigger plenum is idea is long since been proven that the y8s dont make more horsepower. if you look at the specs of the d16z6 and the d16y8 they are identical up to 2hp which could be thanked for the slightly higher compression and the little bit of more lift the y8 cam has. the manifold doesnt do much... altough the y8 manifold can be bored out to accommodate a larger TB while the z6 cannot. if you compare the z6 vs y8 the z6 flow characteristics are smoother compared to the y8's sharper angle the z6 runners are BIGGER than the y8s. the y8 plenum is BIGGER than the z6. well either way swapping manifold is useless both are good till 400whp. the y8s runners are unequal length as well so in recent dynos 09-10 people have concluded that the y8 manifold causes #3 cylinder to run leaner than the rest. and over all isnt that much of an "upgrade" honda designed the manifolds to work with certain motors and head designs so stay with the same years of compatibility


so y8 advantages
* better placed fuel pressure regulator
* "bigger plenum"
* use with 96-00 only

z6 advantages
* smoother airflow
* bigger runners
* use with 88-95 civics

EmZvr

@owneyboy can you tell me why the d16z6 intake should be used with 88-95 and the d16y8 with 96-00 civics ?

I made a lot of thinking about what to buy a z6 or y8 manifold for my D15Z8 (the same as d15z6). I decided to go for d16z6 IM. I didn't fit it yet but after reading it's for 88-95 I'm worried. Did I make a mistake ?

grumblemarc

iTrader: (4)

Um. Because those are the years they were available on those engines?

owneyboy

iTrader: (1)

well the design of (head) cambers and how the air flow works with each motor,. the 88-95 head casting is pretty much the same and designed to flow well with the year manifolds so the best IM for those years would be the Z6 Compared to the 96-00 flow characteristics would be more efficiency if you use those casting with the y8 manifold.. i cant tell you why over the net... but yeah. bigger isnt always better just put it that way

joeymartin7

i have a 97 civic ex with a d16y8. i spun my rod bearings and bought a new motor (a d16z6) i was thinking about using the d16z6 block with my d16y8 head. good idea or no? also does it matter if the motor came off of an automatic tranny? can i bolt it up to my stock 5 speed? the d16y8 has je pistons and eagle rods can i use them in the d16z6 block? first honda ive haad trying to learn and do it the right way not by trial and error

ozh_hawaiian

I think the main issues are that you either have to switch to ODB1 injectors, or convert the ones that came with the manifold, there are probably a few hoses you gotta plug up that wont be used, and a big one is where and how the throttle cable attaches to the manifold(different than z6, or b7)

nealnanoHX

That is not a Y5 mani on the right it is a Y7. The Y5 mani is nearly the same as the Y8 design. The big difference is the Y5 has a EGR setup on in the intake and the Y8 does not. The Y7 intake has the TB on top.

jonsafe1

How would i get this much power? Im looking for around 250-300 hp on my y8

NotARaCist

iTrader: (1)

7 year old thread

@jonsafe1, do not necrobump. Do not threadjack. Do read the rules sticky. Do read the FAQ sticky. Do make your own thread if you have questions that aren't covered, but be aware that we do not suffer the lazy or incompetent around here.