According to the AEM engine chart(s) the civic VX (D15Z1) rods are 3.0 mm longer than a DX (D15B2). Can anyone verify this? Are the deck heights the same? Or is the VX piston pin 3.0 mm higher in the piston?

 

OK I'll let out the secret.
The VX rods are 137 mm long, same as 1.6L. The "normal" DX pistons have a 3 mm higher pin height than a 1.6L piston. The VX pistons are of 1.6L design (3mm lower pin height) but have smaller valve reliefs than the Z6 pistons.

IN THEORY.........
you could use the VX rods with Z6 pistons to make a long rod 1.5L VTEC. I'm betting this is the same design behind the 130 ps 3 stage 1.5L VTEC from JDM.
Once I find some "free" rods I'll assemble and check all clearances.

Can you say a 1.5L Long Rod SOHC VTEC putting out about 150 hp at the crank?

 

So- AEM's chart is incorrect? and the D15Z1 block is basically a D16Z6 block with a smaller crankshaft journal, longer rods and same piston pin location? (same deck height) What pistons can I use in a D15B2 block?

 

AEM's chart is correct from what I know. Send me the link.
Z1 block is same as all other 1.5L blocks. Shorter deck than 1.6L's.

 

I see- so do all 1.6L D-series pistons have the same pin height? You wouldn't happen to know where I could get piston CC's do you? I thought of using D16A1 pistons with VX rods. Will this work in a D15 block (as far as you know)?
I just want to make sure this will work- I will be doing it at work one night on the only car I have and it's all gotta go allright.
I emailed the specs to you. (ZIP file)


[Modified by fixhondas, 5:23 PM 10/30/2001]

 

Got model clay?
This will be the only way to truely know.

BTW A1(or any 1.6L) pistons in a 1.5L block = lower compression.

 

I'm not too familiar with all the D series here....but I am very interested in building something like this for my cousin since the budget is low but his enthusiasm is high.

I've got a buddy with a VX motor laying around....are the bore/stroke simliar to the DX motor D15B(?) in his 95 Civic hatch (canadian)

I suppose I could rip apart the VX motor and try jamming together the above mentioned package for ***** and giggles?

OH ****....wait....I'll need the Z6 Cylinder head now huh? Grrrrr.....

 

no need, just get a 92+ civic DX head, get a 90-1 CRX Si cam, increase c/r with a thin 96+ gasket.....

 

will also need a cam gear to offset the 1/2 tooth difference. You don't have to have it, but it helps.

 

Crap I dun think this will work out since the biggest problem is the fact this might take a bit of downtime.....

Is the 92-95 Civic CX motor a 16valver? Will it work if I mate it (cyl.head) to a 98 Civic CX which I believe is a 1.6L right?

damn.... I have possibly ONE day to do this and I don't have the luxuries of a complete too set nor even a place to work where I won't freeze my nuts off.....
grrrr....

 

Raging Angel: i've got a 91 CRX Si cam i seem to trip over every other day.

lemme know if u want it, i have no use for it!

 

Hey raging- the vx has the same bore and stroke but it has longer rods- if you get a chance- measure how far the piston pin is from the top of the piston. TTHis is information I am looking for. If anybody else has some dx or 1.6 pistons laying around- measure piston head to pin distance. I don't want to buy pistons to get this info.

 

RA: Canadian CX=DX, meaning that the motor and all the parts minus p/s and few options are the same....here in canada, our D15b was 102hp (CX/DX), 16 valves, tranny was also 4.058 FDR....why would you want to mate this to the 1.6l blcok if you can just use the 92+ CX/DX/Si intake or 96 EX/Si(canada again) intake manifold and just switch to the 90-1 Si cam which should fit...

BC winter weather is a summer beach Toronto weather....every work in -40*C....makes you want to think why you even bother with hybrids.....

 

eg6ajk: Thanks for the hot tips. My buddy just picked up the latest issue of SCC I think and he was the one who informed me that his motor was the weaksauce of the bunch. Being uninformed about the whole Dseries evolution, I look here for my unbiased and relative information.

If there is a great website out there which can bring me through the ins and outs of this often overlooked motor, please let me know. I'm looking forward to learning more about them since I believe they have a very good bang/buck quotient.

HyperRev: I'll hold you to your offer till I can find a Si tranny for my buddy here. I might as well throw in a 4.9FD while it is out too.

Please help me out guys....

eg6ajk: One last thing, I'm originally from Edmonton Alberta, I think HyperRev and I can appreciate just how cold and how GOOD I have it over you ....HAhah...NYAH NYAH NYAh....!! j/k All in good fun!

Much appreciate the skooling here...keep it up!

 

Sorry Sorry..one last thing...!

Does the CRX cam really make that much of a diff? Where can I find info such as dyno chart comparisons or lift specs?

Mista Bone, I still have your tranny webpage bookmarked.....very informative!

 

Raging Angel: i've also got a 91 CRX Si tranny/ Motor/ECU kickin around... lemme know if you need anything

as for the CRX cam, the 90-91's had a stronger cam than the 88-89's... and im guessing they were stronger than any of the other non-vtec cams for D motors

eg6ajk: at least you get to spend winters with the Notorious BGP to keep warm... haha

 

I'll post info once i get a VX short block to check all clearances.

 

88-9 vs 90-1 honda claimed imporvement of about 3whp, also i have seen in few other cars and people swear by it... usually you can get these for free or less then $50, takes few hours to install....so why not...

also as MistaBone mentioned a cam gear to fix the timing problem, and further improve power...
skunk2 cam gear can be had for $100US shipped ($155 canadian), from frank lin http://www.g-speed.com/skunk/gears/

 

this is pretty interesting. I have a set of d16z6 pistons laying around and a d15b7 head. does anyone know if the valve reliefs on the z6 pistons will match to the valves on the d15b7 head? if so, and if im correct in understanding the above posts, i could potentially get any 1.5l d-series shortblock, attach z6 pistons to d15z1(vx) rods, bolt em in, and mate the d15b7 head to it? what would this setup be..a SOHC Long Rod 1.5l? hmmmmmmm.

 

That is what I am getting at- a long rod 1.5L sohc vtec w/ high compression. Measure those Z6 pistons for me- I want to know the distance between the top of the piston and wrist pin.


[Modified by fixhondas, 5:08 PM 11/1/2001]

 

stop.........
Use A6 pistons with a SOHC non vtec head.
Use Z6 pistons with a SOHC VTEC head.

BTW normal 1.5L pistons have the pin 3mm/.125" lower compared to 1.6L pistons.

 

I will be mating a Y8 to a D15
so- specnically speaking- I could use some roller waves for a Y8 motor for higher compression- kewl

 

hmm. just out of curiousity, would there be any specific reasons why the z6 pistons wouldnt work with a b7 head? i just want to make use of the parts i have layin around. the z6 pistons are dished/concaved for lower compression also. thanks

 

You could also use the updated headgasket (metal 88-95 civic 1.5) to lower compression. It is 1.12 mm thick - 4 layers

 

So any 96+ D series headgasket will work on any 88-95 D series head just fine and it will also raise tghe compression on the 88-95 motor? I'm getting interested in this D series stuff. Check my sig if you wonder why