which motor combo is best for boost?

[aequitas]

i have a y8 block that im going to build my turbo motor out of but it needs to be honed out so it will be a 1.7L when its done at the machine shop. My buddy (sexicivic2000) did a vtec similar low compression turbo motor but i want something different than what he has...his setup is a y7 block with a y8 crank, y8 internals (completely buildt internals) and a y8 head (fully buildt) and y8 tranny...we were talking a few nights ago about a different setup with mine since i have been playing with my little d15b7 and its actually suprising the shit out of us with what it can do being non-vtec and all (nobody was beliving me when i did the research...cant wait to finish a few things off this weekend and wave to my buddy's with dual cam swaps in the mirror)...anyways...I am really starting to agree with others that i see on here and think that vtec is overrated especially with boost and high revving at that...so my question is this...which setup would be better?

y8 block honed to 1.7L, y8 internals, y7 head with a6 cam/aftermarket cam and y8 cam gear and a z6 tranny...

or a y8 block honed to 1.7L, y8 internals, z6 head with aftermarket cam and a z6 tranny...

or a y8 block honed to 1.7L, y8 internals, b7 head with a6 cam/aftermarket cam and a z6 tranny...

and should i use the y8 crank or does it depend on each individual setup?

i will also be using a z6 intake manifold that has been bored to 62mm and is p&p ( i saw a thread where MistaBone had a y8 im and sold it for a reason and is running his z6) but my buddy argue's this one with me to the end of the earth stating that the y8 is the better intake manifold over the z6...

i will of course be doing aftermarket internals on the bottom end for low compression as well as a block guard...and after everything is all set i would swap over to a y8 tranny with lsd, as it is the strongest tranny of the d's...

what do you guy's think would be the best motor combination for boost? i would like to be able to have more power than my buddy's setup...

i have done so much searching on this site for years compared to how much i have posted (i don't post unless im 100% sure of what im talking about), so please don't say "use the search button" as I want the feedback from YOU people here on d-series that have been through some trial's and tribulation's, possibly even with these setup's...

thanks in advance everyone! its GREATLY appreciated! :honda:

[Clutchmaster]

which ever one you wanna build IMO 1.6's tend to handle boost better because of the aftermarket support

[SovXietday]

VTEC parts are overall built better, flow better, etc. Non VTEC head is even more restricting than the already poor flowing VTEC heads.

That, and I personally will be staying away from D16Ys from now on. Too many issues with them.

[Jcazz]

The only commonly known issue with D16y8's are the bottem end and there weak lower flowing oil pumps. You can fix this buy shimming and porting the oil pump to increase flow. Also the y8;s crank i think has fewer oil squirting action than the Z6. The Z6 lower end has 2 on each part of the crank than just one as opposed to the y8. Take this into consideration when choosing which block you would like to go with, as far as the head goes, i choose the y8 head over the Z6, but then agian this could be perference more than anything, Also with the head, do a nice Port job to go along with your setup. It will increase flow and this is a good thing esp! in turbo Applications.

[SOHC_Rules]

y8 block, z6 oil pump, p29's and a y8 head.... :TU:

:lol:

[Jcazz]

haha thought u ment Z6 block......why the Y8 though (SOHC)? why not a Z6?

[99EJ6T]

a y8 block honed to 1.7L, y8 internals, z6 head with aftermarket cam and a z6 tranny...

this would be were my $ is. use a z6 crank if you can find one.

[SOHC_Rules]

haha thought u ment Z6 block......why the Y8 though (SOHC)? why not a Z6?

well think of it this way... (considering i was joking..)

y8/y7 have dipstick in the oil pump, and z6 have it on the block

now what will happen if its a z6 pump on y8 block?

:lol:

[aequitas]

thanks for all the input guy's...and yes i will definately have the head p&p as well with a 3 angle valve job...

the only reason i ask this is i was doing alot of searching and saw guys hitting 300hp without even touching the head (non-vtec) and i thought that was just very impressive...but i have always wondered about the y8 block with z6 head...decisions decisions...decisions.

[Jcazz]

well think of it this way... (considering i was joking..)

y8/y7 have dipstick in the oil pump, and z6 have it on the block

now what will happen if its a z6 pump on y8 block?

:lol:

Gotcha hehe its been a long day.......

[aequitas]

ttt...great info so far...THANK YOU SO MUCH FOR ALL THE INPUT THUS FAR FROM EVERYONE!!!...I'm considering doing the y8 block and z6 combo...i kind of wanted to do a non vtec but, you guy's have the experience with boosted motor combinations...ive only used nitrous and n/a...til now! :D :honda:

[Jcazz]

make that Z6 block or A6 block, Y8 head....Arp headstuds....and oem headgasket FTW!

[ryan89crx]

"honed" to 1.7L? do you mean sleeved?

[aequitas]

make that Z6 block or A6 block, Y8 head....Arp headstuds....and oem headgasket FTW!

i already a bare y8 block sitting here so I might as well just use it...

[aequitas]

"honed" to 1.7L? do you mean sleeved?

honed...sleeved...bored...wuteva you wanna call it...:)

[Jcazz]

i already a bare y8 block sitting here so I might as well just use it...

oh for sure, yeah if you already have one use it hehe.....:p

[Jcazz]

honed...sleeved...bored...wuteva you wanna call it...:)

oh and there is a difference :hammer:

[aequitas]

http://www.d-series.org/forums/showthread.php?t=49337

thank you guys for all the input...but i found what im going to do...similar to this guy's setup but with the oversized piston's and bore size...oh man...im going to be up all night researching this over and over on all the forums! man i cant wait to show my buddies...i already downloaded the video and watched it like 5 times...my jaw just came up off the floor.

[aequitas]

bump...any advice when doing a setup similar to his? the y8 block/z6 head combo...

[aequitas]

so you guy's are saying to use a z6 crank with my y8 block? and then i would use a y8 oil pump correct?

[hulkbuster]

stock to stock. The d15b vtec head flows best because of the more aggressive cam that resides in there from the factory.

[gpny]

OK here's some advice and comments. I've personally done this so it's first hand:
1) A d16 'honed' to 1.7L would means a 78mm Block - THIS IS A BAD IDEA! This will require sleeves ($$$), and custom bored head gaskets (100$ a pop) , and custom pistons ($$$) - I have a 77mm Rs sleeved d16y8 (1.68L), I got a great deal on the block/pistons but if I were to start over, I would do a 75mm bore.
2) Block/pump combo: First of all, the OIL PUMP MUST MATCH THE BLOCK! The mounts on the Z6 and Y8 pumps are different! (the dipstick is also)
3) Block/Head/IM combo -
- If you have a z6 block, use that. It has a better oil pump.
- Z6 Head is said to flow better up top because of straighter runners
- Y8 Manifold is said to be the best OEM I/M
- I saw no difference between the Y8 and Z6 cranks when I had them side by side, so I used the one that gave the nicest bearing combo in the block
- Z6 Head is OBD1 Stock so you can use
So - Ideal combo IMO is Z6 Block, Z6 Head, Y8 I/M
You can also use a Z6 head on a Y8 Block - you'll need 1 or 2 (I used 1) Z6 headstuds and a couple extra washers, the rest will be y8 studs.
Crank pulley and gear go with the block, and plastic covers match the block

[aequitas]

OK here's some advice and comments. I've personally done this so it's first hand:
1) A d16 'honed' to 1.7L would means a 78mm Block - THIS IS A BAD IDEA! This will require sleeves ($$$), and custom bored head gaskets (100$ a pop) , and custom pistons ($$$) - I have a 77mm Rs sleeved d16y8 (1.68L), I got a great deal on the block/pistons but if I were to start over, I would do a 75mm bore.
2) Block/pump combo: First of all, the OIL PUMP MUST MATCH THE BLOCK! The mounts on the Z6 and Y8 pumps are different! (the dipstick is also)
3) Block/Head/IM combo -
- If you have a z6 block, use that. It has a better oil pump.
- Z6 Head is said to flow better up top because of straighter runners
- Y8 Manifold is said to be the best OEM I/M
- I saw no difference between the Y8 and Z6 cranks when I had them side by side, so I used the one that gave the nicest bearing combo in the block
- Z6 Head is OBD1 Stock so you can use
So - Ideal combo IMO is Z6 Block, Z6 Head, Y8 I/M
You can also use a Z6 head on a Y8 Block - you'll need 1 or 2 (I used 1) Z6 headstuds and a couple extra washers, the rest will be y8 studs.
Crank pulley and gear go with the block, and plastic covers match the block


I was already planning on buying piston's well actually the whole bottom end...also I will used arp head studs so will I need to still use z6 one's? I doubt it...I will tackle that problem when I come to it...I already have a bored pnp z6 intake mani that im going to use...I actually plan on doing the y8 block with a endyn y8 oil pump, z6 crank, z6 head with my z6 im...i just wonder which headgasket to use, im assuming a metal z6...as far as what size the cylinders will get honed and what size piston's to use i will find that out when i take the block to the machine shop...thank you for all your help...what is yout current setup?

[siregcivic]

stock to stock. The d15b vtec head flows best because of the more aggressive cam that resides in there from the factory.

prove it:hammer: ... someone lend me a mic and tell me how to mic a cam and ill mic mine.. outta a 92 si hatch d16z6

back to the thread.. i seen somewhere 2 dyno charts where the z6 intake mani made more power over the y8 mani.. also its been stated that the y8 mani leans out in one of the cylinders

[aequitas]

prove it:hammer: ... someone lend me a mic and tell me how to mic a cam and ill mic mine.. outta a 92 si hatch d16z6

back to the thread.. i seen somewhere 2 dyno charts where the z6 intake mani made more power over the y8 mani.. also its been stated that the y8 mani leans out in one of the cylinders

see I could have sworn I saw that same thing, but I wasn't going to open my mouth until I was sure. Thanks for all the help guys! I think im going to drop off the block at the machine shop today and see what they say about it!

shaun

[pennyless]

You need to do some more reading on D series motors. A D16 bottom end is interchangeable with other D16's(no ZC). Like mentioned, the Y8's and Y7's are known for chewing up rod bearings because of bad oil pumps. You either get a good one or a bad one. Mod the pump and you should be fine.

Honing is just scuffing up the cylinders. You are going to want to bore the block and then hone it if the cylinders are out of spec.

[aequitas]

You need to do some more reading on D series motors. A D16 bottom end is interchangeable with other D16's(no ZC). Like mentioned, the Y8's and Y7's are known for chewing up rod bearings because of bad oil pumps. You either get a good one or a bad one. Mod the pump and you should be fine.

Honing is just scuffing up the cylinders. You are going to want to bore the block and then hone it if the cylinders are out of spec.

lol...no shit? when in this thread have we not talked about interchanging d-series block's and head's...don't just try to post whore my thread with useless comments like that...you obviously did not read this thread and have contributed nothing to my question...and im going with a endyn oil pump so I do not see how that is "a bad oil pump." Me and my buddies were talking the other day, one drive's a spec-v the other a rx-7. Both go on forums and have this same problem. This is just a waste of time and is not the reason that we have forums.

[13g-crx]

I think honing boring or thinning the stock cylinder walls in any way is a bad idea all together for boost. Unless of course your having the block sleeved. I always thought that the y8 was the better IM, but I saw somewhere that a guy did dyno pulls with the z6 then with the y8 IM and proved that the z6 actually made more whp across the board. y8 had a couple of spikes here and there.

[aequitas]

I think honing boring or thinning the stock cylinder walls in any way is a bad idea all together for boost. Unless of course your having the block sleeved. I always thought that the y8 was the better IM, but I saw somewhere that a guy did dyno pulls with the z6 then with the y8 IM and proved that the z6 actually made more whp across the board. y8 had a couple of spikes here and there.


See that is what I was under the impression to but I did not have the source to back it up so I kept my mouth shut for the time being. I have decided to go with the above setup that I stated, but I am still unsure as to what crank I should use.

[hatchnthoughts]

honing is fine since it takes off a very small amount of material and its a good thing to do when rebuilding a block... where else is the crosshatch pattern going to come from to help seat the rings and whatnot? boring is not good without resleeving since the cylinder walls are pretty thin on d's

[aequitas]

ok...im going with a y8 bottom end, a y8 oil pump (that my buddy will mod for m ee similar to the endyn one) and a y8 head with a 98 y8 im. I read a great article in a recent issue of honda tuning that confirms the y8 flowing the best overall. So im selling the z6 and going all y8. Im going eagle rods and srp piston's. The head in going to use already has port work as well as a cam and adjustable cam gear, I will get everything re-machined to a mirror finish before installing everything. As far as the turbo im going with a bigger turbo like a t3/t4 hybrid...not exactly sure on which one I will use but will figure that out soon. I already have half my turbo setup so I will keep you guy's posted as I continue the build! WISH ME LUCK!

oh ya...im going to file a non-op on my car and completely strip it...the car is a 93 dx coupe. FTW! maybe some lexon to replace the glass and a fiber glass front end...but that will all be in good time! starting to strip the car this weekend and will continue to do more as it cools down! It's just WAY TOO HOT here in BAKO during the summer.

:honda: