Due to the abundance of questions that I am receiving (4-5 PMs a week)

I'm just going to plop everything into this post so that I don't have to keep repeating myself. All of this is typed from memory. If I'm wrong, oh well.

D15Z1, found in 92-95 civic VX
92hp, 1.5 liter, SOHC VTEC-E

75mm bore
84.5mm stroke
137mm rod

same block as obd1 jdm d15b (the sohc vtec one)
same length rods as jdm d15b and d16, but [/b]NOT[/b] the same rods. D16 cranks have larger rod journals than D15 Cranks. For a d15 crank with d16 rod journals, the OBD1 JDM D15B is the only crank that has this. Moving on

Deck height is the same as every other D15 block, 207mm

With the same stroke as a D15 NON-VTEC, same deck height, the piston is shorter, 27.75mm This allows for the 3mm longer rod.

The head has a very small combustion chamber, It has very small valves and small ports. Intake manifold runners are small, throttlebody is small. The pistons have a HUGE dish in them to give it normal compression with the tiny chambers. There is nothing about this cylinder head that gives it high rpm power.

The distributor has the same bolt pattern as the d16z6. With 88-00 D-series, there are two bolt patterns of distributors.
1. The Normal style
2. obd1 vtec style. Found on d16z6, JDM D15B, and d15z1

D15B, D16z6, D15Z1 vtec solenoids are the same.

Head has a p07 stamp code

Head uses VTEC-E roller rockers, these rockers can fit in a d16z6 head with the d15z1 cam. If you want larger ports, larger valves, get a z6 head. If you want to pursue a high performance VTEC-E project, search for threads created by me in the eg/ek forum.


FAQ #1
Q: Can I do a d16z6 head swap on my d15z1?
A: Yes you can, but the dish on the d15z1 pistons are too large for a normal non-vtec or vtec head. Your compression will be stupid low.

FAQ #2
Q: What pistons can I put in my d15z1?
A: you can put d17a7 2001-2005 civic GX pistons on your vx rods and achieve ~10.8:1cr with a z6 head. Other options include: Any d17 piston, jdm d15b P08 piston, or vitara. Vitara piston will stick 0.018-0.020" out of the hole in a d15z1. You cannot use a vx with vitaras and a y5/y8 head.


FAQ #3
Q: What do you reccomend me doing for my d15z1?
A: See below


If I had a d15z1, what would I do?
d15z1 block
PMS pistons (2001 civic GX d17a7)
d16y5 head (or d16y8 head and use z1 rocker assembly)
d16z6 or d16y8 intake manifold
crower regrind of z1/y5 cam
decent header


buy a zc trans and put the zc 3rd in my vx trans, use my vx 3rd as 4th, and use the zc 5th, along with an ex final drive of 4.25

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It's not worth going overboard and spending lots of $$$$$ here. If you get too ahead of yourself, you will have spent more than a H/B swap and have less results.

But sometimes it's good to beat up on the B's with a lowly d15z1

Any further questions ask in this thread, schardbody and I will be able to answer your questions in HERE.


Modified by Bense at 7:52 PM 12/13/2006


Modified by Bense at 7:22 PM 12/18/2006

 

 

Great info.

 

97 ft/lbs @ 3000 rpm. One reason they got the gas mileage they did was from short-shifting.

 

bump for D15Z1...

how bout the intake ...same port size?
how bout the Throttle body...same bolt pattern?

Thanks Bense

 

too small to matter

 

needs a bump or sticky...lol

 

What if I didn't care about vtec, would the vx cam fit in a d15b7 head?

 

no

 

how bout a z1 myths and rumors thread???

 

Damn so putting a D16Z6 head on wouldnt be worth it???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Stevegunit16 &raquo;</TD></TR><TR><TD CLASS="quote">Damn so putting a D16Z6 head on wouldnt be worth it???</TD></TR></TABLE>

not without swapping pistons, your compression will be near 8.0:1 (been awhile since i checked it), so basically WAY less power to start with.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bense &raquo;</TD></TR><TR><TD CLASS="quote">

Head uses VTEC-E roller rockers, these rockers can fit in a d16z6 head with the d15z1 cam. If you want larger ports, larger valves, get a z6 head. If you want to pursue a high performance VTEC-E project, search for threads created by me in the eg/ek forum.
Modified by Bense at 7:52 PM 12/13/2006</TD></TR></TABLE>

Just a quick question for you Bense, when swapping out the rocker assembly and cam in the z6 head for the vtec-e components, will the vtec engage like a z6 or a z1. (If using the p28 ecu?) Id like to convert to roller rockers but keep the normal vtec instead of vtec-e. Not sure if this is possible, if it is, would it be a direct swap of rockers and cam or are there other modifications needed to make it behave like normal vtec? Thanks for your time. Great thread and I second the sticky.

 

TTT

 

i sold a guy a vx motor. he took the head from his 89si hatch (d16a6) annd said it timed up and ran good. i thought it would run like crap?

 

vx cam + vx rockers = vx style engagement
ex cam + ex rockers = ex style engagement

 

Damn. Didnt think it would be that easy but I was hoping it would. What do you think about removing that lockout pin that keeps the 2nd intake valve closed until 2500rpm? Would that allow Z6/EX Style Vtec engagement or are my efforts futile? Ive got a mini-me laying around and a friend with a Z1 thats getting pulled for an F22B, so I wanted to explore this path. The only pros to the Z1 rocker set up in the Z6 head are increased flow due to signifiganlty larger port sizes and possibly better fuel economy. This setup is on a B7 block btw so would the compression ratio be so high that running the lean ratio until 2500 just be asking for detonation? Im willing to blow it up to learn something, just wanted to see what you think first.

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NA_DA &raquo;</TD></TR><TR><TD CLASS="quote">Damn. Didnt think it would be that easy but I was hoping it would. What do you think about removing that lockout pin that keeps the 2nd intake valve closed until 2500rpm? Would that allow Z6/EX Style Vtec engagement or are my efforts futile? Ive got a mini-me laying around and a friend with a Z1 thats getting pulled for an F22B, so I wanted to explore this path. The only pros to the Z1 rocker set up in the Z6 head are increased flow due to signifiganlty larger port sizes and possibly better fuel economy. This setup is on a B7 block btw so would the compression ratio be so high that running the lean ratio until 2500 just be asking for detonation? Im willing to blow it up to learn something, just wanted to see what you think first.</TD></TR></TABLE>

im confused, what does roller rockers have to do with port size???

 

Nothing. Im just saying swapping the roller rockers into the z6 head wouldnt give you ex style vtec with less friction on the valvetrain, it would only make a much better flowing vx head.

 

what if u boost it ???\ thinking bout it ?

 

i know this thread is old as hell but i have a z1 head thats freshly rebuilt and im thinking about putting it on a d17 bottom end and getting a custom cam ground for the roller/rocker setup to use full vtec instead of vtec-e.

estimated cr is 11.43/1 with stock d17 internals and i will be porting the z1 head.

do you think this will be a good combo? im shooting for around 160hp and want it have a good bit of torque as well but still lighter than a bseries.

 

I got told you can put a z6 cam in a z1 and it will help a little. Is this true

 

Please create your own thread.

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