d15z1 block with d16z6 head

[opieone]

i was reading all the forums but i was wondering do i need anything else besides a ecu and timing belt to preform this. i have a vx with the d15z1 and i have the d16z6 head.

[91civicDXdude]

you will have very low compression, just so you know. the d15z1 engine has a *MASSIVE* dished piston to accomodate for the very small combustion chambers on the d15z1 head. the z6 is the opposite.. it has a slight dish piston, and a larger combustion chamber.

with that combination, im guessing you would get about 8.1:1 compression, which is pretty low for any kind of NA power..

[opieone]

what would i redline at? and also a guess what hp should i accept?

[transzex]

slightly dished????????/

http://www.bettendorf.com/~mrbone/pictures/DeadD15/VX_DX_6.JPG

REALLY dished, but damn near perfect for a 7-9 psi turbo setup.

[opieone]

i have d16z6 pistions can i use those with my motor.

[91civicDXdude]

read it again, bone. i said the z1 had a *MASSIVE* dish and the z6 has a slight dish

[transzex]

the pics show a slight dish, not a MASSIVE DISH!!!!!!!!

[91civicDXdude]

http://www.heeltoeauto.com/dseries/images/P07top2.jpg
http://www.heeltoeauto.com/dseries/images/P07top1.jpg

a 7.05mm dish is massive in my book

and 7-9psi on 8.5:1 compression would net you about 30 less horsepower than with 9.2:1 or similar. tell my friends that low compression is good for boost.. both runing y7/y8 mini-me engines, one JRSC @ 9psi and one 14b turbo @ 10psi, 13.9 & 13.5. its all about the tuning. did i mention the turbo guy was the creator of turboEDIT? :twisted:

[opieone]

everyone says that the jdm d15b is just a d15z1 blcok with a d16z6 head. if that is true how is that producing 130 hp. what is the compression of the d15b. what hp would i get if i did the d16z6 head on my d15z1 with out changing the pistions.

[sph33r]

everyone says that the jdm d15b is just a d15z1 blcok with a d16z6 head. if that is true how is that producing 130 hp.

I believe it's the D15Z1 block with D16Z6 pistons and head. Which would easily explain the power output.

[Chris]

What are the best pistons to use in such a combination for increased power. That is , If you have the D16Z6 head and pistions + the D15z1 block what pistions can I put in to get more HP.

ZC pistions ? If so which ZC pistions ? Also how much faster would I go ?

[z1 master]

All I have to say is take your z1 block, put in '89 d16a1 pistons, slap the z6 head on there and go have some fun cause you wont believe how much more power you will have. :shock: ....... :D

[Tad]

ok if the d16z6's head has bigger combustion chambers than others...

then why when you put it on a d15b7 blcok it jacks up the compression??

[ottomaticjack]

because the B7 pistons are flat heads, which cuts down the size of the combustion chamber thereby increasing the compression IE: more power.

[Chris]

All I have to say is take your z1 block, put in '89 d16a1 pistons, slap the z6 head on there and go have some fun cause you wont believe how much more power you will have. :shock: ....... :D

Thanks z1 master but what is the approx. compression ration of a1 pistons ? I plan to race my car at the track (drag racing) but still keep it as a daily driver. Is the compression like low 11s or high 10s ?

Also what cam will work best ? I am assuming my stock cam would not be efficient with a set up like this.

peace

[melfice_mx]

i did what Z1 master is saying and DAM! bes low and mid end power .. i think even better than the B16, not no so great top end..


i'm using a Z6 engine in my Eg Hb right now, but i'm still building the Z1 ;)

[z1 master]

I think the cr is about 12.5/1. Run on 92 octane and tune it well. If you plan on adding any after market cam you will need to clay the motor for clearances. but set your timing marks and triple check them or you might bend a valve :wink:

[turntune]

z1...which timing belt to use?.....I plan on putting the z1 rods on a b7 crank....also if using a1 pistons work, then d16 pistons would also work....a1 pistons normally have a 9.5:1 in their d16 motor...so if putting them on z1 rods and running a z6 head....the 88-89 a6 pistons might yield a nice balance...a6 pistons normally create a 9:1 in it's d16 motor .....make sure to use pre 90 pistons as the 90-91 were 9.2:1's....you would still have to check piston clearences to run ANY aftermarket cam...

[z1 master]

ok with your set up the c/r will probly be around 11.5/1 but if you want to know the exact c/r you will need to measure the piston to deck highth. then figure out what headgasket you are going to use, measure the thickness of that and also remember to take off any amount that was milled off the head. and to make it simple just let me know what they are and i will figure it out for you. and for the timing belt, use the longest one you can cause the tighter it is the shorter your crank bearings will last.

[z1 master]

oh yeah this is a very dependable motor build. i have been running mine for a looooooong time. :D

[sikegh1]

iam doing the same thing z1 block, z6 head and i waswondering which harness do i use my vx or an si?

[z1 master]

you can use either harness.

[2nd_gen_crx]

Would a d16z6 head bolt onto a d15b2 engine?

[cation]

^^^yes

[turntune]

hey Z1...also I think your Y8 head makes the compression higher as well....being the Y8 head has the quench zones and all...I think using a z6 head will yield a different compression ratio.

[Chris]

I think the cr is about 12.5/1. Run on 92 octane and tune it well. If you plan on adding any after market cam you will need to clay the motor for clearances. but set your timing marks and triple check them or you might bend a valve :wink:

Sadly in Jamaica our highest octane is 90 :cry:

So what other pistions can I use because I do not want to retard the timing toooooo much ? I think 11.X pistons can work on 90 octane, so what pistions can I get ? Remeber its the D16A6 head and D15Z1 block.

Thanks again for the assistance......

peace

[turntune]

okay...after some serious math....and now with a serious headache...heres a few combo's that should work for your set up
try pms-a00 pistons....01-03 gx d17a....their compression height is slightly(.75mm) lower than the z1's but they have a slight (1.5mm) dome.....should yield around a 9.5-10:1 compression ratio with the a6 head...01-03 dx,ex,hx pistons would be great turbo pistons on your set-up....with a z6 head and z1 bottom end 01-03 gx pistons yield a 10:1 w/z6 head gasket and a 10.4:1 with a y8 head gasket...just so you all know......and z1...i did the math.....brother you are playin with fire.....

[transzex]

did you use the new math or old math????????

[turntune]

well, I used a standard compression calculator....taking into the factors of the Comp height of pistons....volume of dome or dish on the piston.....thickness of head gasket....piston to deck height....volume of combustion chambers on the head....I started with Z1masters setup...came out to be very close to 12.8:1...thought it to be wrong so I tried stock setups with my same formulas and came up with corresponding numbers to the stock setups....so I figured I'd try other d motor franks...didn't think they were so far off that the great and powerful OZ would question my numbers................ :?

[wnc_klx_rider]

newbie with a d15z1 d16z6 minime,
I make decent power, and I can push a stock gsr swap hatch,
But as we know so well here a d-series.org , you dont need a dohc to go faster.

dyno sheet link
http://blueridgemotorsports.com/index.php?topic=6.0

dyno vid link
http://vids.myspace.com/index.cfm?fuseaction=vids.individual&VideoID=17135294

Thanks,
jonathan

[d15z1sux]

wow this is very interesting to read. as i am about ready to chuck out my d15z1 altogether. so just wondering did this save u money over just swapping to a d16y8 or jdm d15b?

[d15z1sux]

what about the intake manifold and throttle body? is it the similar size to d16y8 and jdm d15b? will it be a significant restriction to the rest of the engine once u change out the pistons and head?

[wnc_klx_rider]

ls fuel rail, injectors, and throttle body, stock z6 manifold and no internal work, I really used the Z1 block cuz I had it laying around, it has turned out to be a good low boost turbo motor, about 10,000 boosted miles and about 100,000 on the block before the z6 head came along, and I drive the piss out of it, and it still cranks first time every time, some pistons WOULD be a good idea, but once you go that far its defeats the purpose of low budget.:bravo: