dlric

what would make for better power..a d16z6 long block w/teg pistons+y8 headgasket or a z6 short block, teg pistons+y8 headgasket w/ a d15b7 head (w/d16a6 cam)? also i've read that d16a6 engines like boost more than z6 engines..would the d15b7 head be the way to go for boost?
thanks

B18C-EJ1

Ok, you cannot put Teg pistons in a D series block unless you sleeve and bore it.

Again, see above.

Again, you're talking apples to oranges. Boost is all relative. When someone says they're boosting 10psi, that's what the intake manifold pressure is at, not how much boost is getting into the engine.

The D15 is too weak an engine to boost "Reliably" on over time. The D16 is a better choice, but why when you can get a swap for less and have it be completely reliable for a long time.

You should do some research on all this before making such a choice.

dlric

actually im running d16a1 pistons in my d16z6 right now w/a y8 headgasket. its been runnin fine for months, and all i had to do was connect the valve reliefs on the pistons so there wouldnt be valve/piston clap. it runs fine all the way to 7000 rpm (not that i go there much ). i have a b7 head sittin in my garage and ive read that an a6 longblock with my pistons/headgasket is a more powerful combo than my current z6 longblock. it wouldnt be much dough to get a si cam to throw in the b7 head on top of the z6 block (and not much labor to do the head swap), and mebbe have it p&p while im runnin wit my z6 head. anyone tried this?

B18C-EJ1

Those are 86-89 Integra pistons. Essentailly a ZC engine. Please specify that. When you say Integ, 99% of the people reading this are going to think B-Series.

Blown90hatcH

GSR

dlric

im assuming then that no one has actually tried what im talkin about since no one has actually answered my q. thanks.

oOxsboostOo

GSR!

dlric

GSR? how is that answering my question? i dont care about no dohc vtec. project fok a vtec comin ur way. (biiiiattttchhhhh)

Katman

1) go with the 1.6L block - no replacement for displacement

2) You can go with either Z6 or Y8 block, I say go with the Y8 block since it's newer and I think it has a tad bit higher compression than the Z6 block in stock form. Actually..have you checked out an HX block? thing has like 10.0 compression! nuts for a gas saver engine and it's 1.6L too!

3) as for boost....I'm no boost expert - but I do know you want low compression for a turbo setup and using 88-89 integra pistons isn't the right thing to do. Those pistons will raise your compression.

I'm getting the impression you wanna build up SOHC turbo engine using a NON-VTEC SOHC block + NON VTEC head, yes ?

I'm unsure if the 92-95 non-vtec heads will bolt onto a Z6 block. And the same for the 96+ heads + block also.

Common sense tells me this...
try finding the specs out on all of the 96+ SOHC (vtec and non) engines. Go with the one with the lowest compression. Why 96+? because they're all 1.6L engines.
Try and stick with the 96+ Y8 intake manifold too - it's like a mini-'R' manifold for the SOHC VTEC head (I think it also fits on NON-vtec heads).

I hope I'm right, in thinking you wanna stick with OEM honda parts with this setup...






[Modified by Katman, 11:18 AM 10/16/2001]

dlric

Hey, thanks for the info.
I'm getting an impression I wasn't so clear with my posts.
Anyway, my current setup is:

91 crx - d16z6 longblock - d16a1 pistons - d16y8 headgasket.

I'm thinking its time to pull the plug on vtec. So, I want to ditch the d16z6 vtec head. I have a d15b7 head sitting in my garage that I'd like to mate to the z6 block. Basically my question is whether or not anyone has tried this? It seems like a backwards mini-me, but I'd like to keep my z6 block.

The next thing is I've read that a d16a6 cam will fit into the d15b7 head. If I'm gonna put that slow *** head on, I'd rather put in the d16a6 cam (more aggressive).

Are the d15b7 valve springs "weaker" than the d16's? If so, does anyone know if d16z6 valve springs will fit into the d15b7 head? I heard that d16a6 valve springs were replacement parts for the d15b7 valve springs.

Ok last q. Right now I'm running a d16a6 crank pulley on my z6 block. Is it possible to put an '89 integra crank pulley in place of the d16a6? I have one lyin around and it looks mad light.

Thanks!

Kamin

just a Q but why spend all this time and money on a SOHC engine to turbo it?
youll get triple the results if you swap a b16 into it.
sorry but its my opinon.

dlric

Honestly yeah, I like the underdog sohc engine. One I'm a fulltime college student (5 classes) who works 32 hrs a week at a job, so I dont have the time nor money to do another engine swap. Two I have sohc garbage all over my cellar, so I might as well do something with it all.

The d16z6 itself isn't exactly the most impressive engine, so I'm opting to try another route..a d15b7 head w/d16a6 cam (almost basically a d16a6 head) on top of a z6 block. I feel like not many ppl have gone this route, so why the hell not be a sohc pioneer Honestly I felt like my old d16a6 engine had more go to it than jus a straight d16z6 in my crx. So why not combine the two and see what happens? Shoot if no one dared to be different than how would we all know what works and what doesn't? I like to tinker with engines, and I also like to pull for the underdog, which in this case is my puny lil 1.6 sohc. Besides, it'll be funny when i spank ppl and they look under my hood to see what looks like a gas saver 1.5 sohc "honestly I dont know how i beat you..all I have is a base dx 1.5 liter engine." hahahha. thats the good stuff right there. Its analagous to smokin a 5.0 and having them pop open your hood and you saying "honestly i dont know how i beat you..all i have is a dohc 1.6 vtec." its all the same in the game.


so has anyone done this?

fixhondas

Yes- the D16A6 head is the same as the D15B7 head with a different cam. Both of these heads will BOLT onto each other's block and the D16Z6 block. all of Honda's SOHC 1.6's (88-00) are "essentially the same" they have the same crankshaft with differences being in the rods (strength) and pistons. The Y8 and Y7 heads will also bolt on to your Z6 or B7 or A6 blocks and vice versa. I believe the Y8 and Y7 blocks have a spot for a knock sensor and their oil pans may differ (cast aluminum or stamped steel) Using a A6 or B7 head on a Z6 block will lower the CR if you use stock Z6 pistons. A6 and B7 heads have larger combustion chambers than the Z6 and Y8 while the Y8 is smaller than the Z6. Maybe this helped. I am trying to decide if I want my Y8 head on my D15 or should I get a D16?

dlric

Thank you for the info..that clears up if the d15b7 head will bolt to the d16z6 block. Actually I'm using d16a1 pistons in the z6 block. the tops of the z6 pistons are concaved, lowering the compression. so i ditched those. So then would i be correct in thinking the z6 valve springs will fit into the b7 head? I guess to rephrase that q..are the z6 valve springs and the a6 valve springs the same?

I've done a mini-me for a friend..d16z6 head on d15b7 block. He was getting about the same compression numbers as I am now with a d16z6 longblock (d16y8 headgasket for thinness) w/d16a1 pistons. about 270 on all four cylinders. If u mini-me'd a Y8 head (w/y8 headgasket) on a B7 block and dropped in A1 pistons, you'd prolly be running pretty high compression (if thats what u're looking for). Your engine would prolly haul *** too (for us puny lil sohc'ers). I would say go that way if yer looking for a quick high compression n/a engine.

fixhondas

The z6 springs are not the same as a6.

Mista Bone

D15B7 and D16A6 heads are the same. Also in mid 92 production Honda started using the stronger A6 springs.

If you use the 1.6L cam on a 1.5L block, it will be off 1/2 tooth. Best bet to get a cam gear.
http://home.cinci.rr.com/mistab0ne/Pics2/DynoCam.jpg

Next combo will be a long rod 1.5L VTEC using off the shelf Honda parts.
Should be good for 130+ hp the the wheels.

eg6ajk

mista bone: whats the long rod 1.5 vtec setup....

since i went back to d-series back...

current setup JDM D15B (sohc vtec) 9.3c/r , factory claimed 130ps and 14.1kg/m torque...with a jDM S20 tranny (LSD equipped)

what would be a cheap mod....

i was thinking of going with d16y8 but heard of bottom end problems....

4wsB21a

hey b18c - you are wrong about the integra pistons fitting into a crx block. the 1.6 integra pistons will "drop" into a crx block, both 1.5 and 1.6. they are all 75mm bore. the 1.8 pistons can't fit, since they are a bigger bore. those you would have to bore out, but don't waste your money - just put the high compression 1.6 integra pistons in it if you want higher compression, or put the 1.6 si pistons in there for the lowest compression.


[Modified by crxplus, 2:20 AM 10/23/2001]

Mista Bone

from my info, you already have the long rod 1.5L......
1.5L VTEC gets 137 mm rods instead of 134 mm rods in the non VTEC motor.

4wsB21a

what car has a 1.5 VTEC?

dlric

sweet. my d15b7 head is a '93 so it has the d16a6 springs?
bah. a d16a6 cam is $240 from honda, and im sketchy about gettin a cam out of a junkyard.
are there any known d series cranks that'll yield a betta rodxstroke on a d16z6 block?

eg6ajk

JDM cars such as Civic Vti, Del Sol CRX VXi, Civic Vi all have the 130ps 1.5l vtec....

then there is the Civic VX or ETi which comes 1.5l vtec-e......

Mista Bone

A6 cams go for about $30-40 used.

4wsB21a

so jdm has a smaller engine than usdm? that is amazing. i thought we were totally outpowered in usdm by the jdm specs. is the 1.5 vtec sohc or dohc?

eg6ajk

they are 1.5 sohc vtec is the JDM equivalent of the d16z6, supposedly 2hp more on the 1.5l JDM block but 4lbs less torque...

but will see, i'll take it to a dyno and see...

should pull in the 108-112hp range and about 90lbs of torque...but will see..

there was also ZC sohc vtec which is also rated...at 130ps but with 107lbs/ft of torque...

other JDM d-series motors were the DOHC ZC (only came in JDM 92 Si (SE), as well as few 4wd civics), there was also the d16a which was imported from the states mated to the EJ coupe and sedan...

all these were rated at 130ps=127-8hp and 102-107lbs/ft of torque...

countless d13bs (1.3l) d15b, with carbs, FI, and few SOHC ZCs at 120ps...