D16y8 vs D16z6
 

Just wanted to do a D16 comparison.

I was wondering if you guys can add some things to the pros vs cons list that I was making for these two motors. I was looking at them in relation to my '96 Si. I'd like to know what the real differences are between the two. Obviously I might be wrong on a few, but please feel free to correct it.

D16y8:

Pros:
- many aftermarket parts
- easy and low cost to repair
- reliably boosted at low psi
- low cost replacement (~$500)
- can keep OBD2 ECM for '96 Si
- better flowing intake manifold design
- better flowing exhaust manifold

Cons:
- can't tune OBD2
- weak oil pump
- weak rod bearings
- boost can be risky due to above
- worse head design

D16z6:

Pros:
- OBD1 can be tuned
- many aftermarket parts
- easy and low cost to repair
- stronger oil pump
- stronger rod bearings
- can handle more boost, more reliable to boost
- low replacement cost (~$500)
- better head design

Cons:
- slightly less power that y8
- need to get OBD1 ECM
- need to get harness for OBD2-OBD1 conversion
- more restrictive intake manifold design
- more restrictive exhaust manifold design

What else?

RE: D16y8 vs D16z6
 

the y8 has steel shift forks compared to aluminum on the z6 the steel are way stronger

RE: D16y8 vs D16z6
 

all it takes is a chipped ecu and a conversion harness to convert to OBD1.

The y8 also has known bottom end oiling issues...

RE: D16y8 vs D16z6
 

z6>y8 nuff said..............only thing i like about the y8 is the combustion chamber in the head.....

RE: D16y8 vs D16z6
 

And there isnt such a thing as an '96 Si

RE: D16y8 vs D16z6
 

The '96 EX Coupe in the US is called the Si in Canada. Maybe should have mentioned that. It has a D16y8.

RE: D16y8 vs D16z6
 

I don't think the oil pump is the problem with Y series, it's small oil passages. Also I don't know about the Z6 oil pump either.

They both make about the same power. 2HP is negligible.

No ODB converting is necessary with the Z6 if you just get the OEM harness (which may be included with the swap, as well as the ECU).

You're right about the stock exhaust manifolds.

The head design is better on the Z6 from what I've seen, but the Y8 intake manifold is better than the Z6.

Will add more later, gotta run.

RE: D16y8 vs D16z6
 

That's interesting, because I've actually heard it the other way around. That the flow on the y8 is better

RE: D16y8 vs D16z6
 

Yeah, i think kedawei is confused, it has been pointed out many times the y8 combustion chamber is a step up over the z6, but id still go with the z6

RE: D16y8 vs D16z6
 

i still love the z6 over the y8, just seams more user friendly