d series motor
10-24-2006, 07:39 PM
#7
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Re: d series motor (USDMej1)
y 8 has a better flowing intake manifold, also known as the type R manifold of the D series. It also has a better flowing header, im pretty sure. This results in a smoother power band. Other then that I really couldnt tel you. Their both fun in a little pre 93 civic, but my 97 4 door with a y8 feels quite sluggish. I got beat by a V6 5spd auto exploder.... 
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10-24-2006, 07:51 PM
#8
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Re: d series motor (mattyv)
Also, if you are speaking of full powertrains, the Y8 tranny is better. I believe the Z6 head is a bit better flowing than the Y8, but don't quote me on that. It's been a while since I've been in the game. 
10-24-2006, 08:19 PM
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Re: d series motor (RTE117)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RTE117 »</TD></TR><TR><TD CLASS="quote">Also, if you are speaking of full powertrains, the Y8 tranny is better. I believe the Z6 head is a bit better flowing than the Y8, but don't quote me on that. It's been a while since I've been in the game. </TD></TR></TABLE>
x2 the y8 tranny kicks ***. goes higher in 2nd then my b16a but still slower.
</TD></TR></TABLE>x2 the y8 tranny kicks ***. goes higher in 2nd then my b16a but still slower.
10-24-2006, 08:31 PM
#10
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Re: d series motor (eghatch16)
Also any y8 will be newer then any z6 
Bout the tranny, dosnt the z6 have stronger components then the y8? Dont the y8 forks in the tranny bend in time?
Bout the tranny, dosnt the z6 have stronger components then the y8? Dont the y8 forks in the tranny bend in time?
10-24-2006, 08:32 PM
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Re: d series motor (eghatch16)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eghatch16 »</TD></TR><TR><TD CLASS="quote">x2 the y8 tranny kicks ***. goes higher in 2nd then my b16a but still slower.</TD></TR></TABLE>
Uhh the shorter the gear the better.
Uhh the shorter the gear the better.
10-24-2006, 10:09 PM
#13
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Re: d series motor (mattyv)
The z6 head is also more suited for top end power. The differnces are so small it is just better to use the head that goes with your body. The z6 is obd1 and the y8 obd2.
10-24-2006, 10:42 PM
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Re: d series motor (Teal95Coupe)
the reason the Y8 has higher compression is due to a thinner head gasket. Higher compression is better for N/A so it depends on what you plan on doing with the motor. N/A or F.I.
Also about the tranny. The Z6 tranny has aluminum shift forks so if you break one of those you just replace the shift fork. The Y8 tranny has steel shift forks which bend, and if that happens you replace a lot of other ****. - Bense told me this and he knows pretty much everything about trannies. 
Also about the tranny. The Z6 tranny has aluminum shift forks so if you break one of those you just replace the shift fork. The Y8 tranny has steel shift forks which bend, and if that happens you replace a lot of other ****. - Bense told me this and he knows pretty much everything about trannies.
10-25-2006, 03:58 AM
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Re: d series motor (petty$rep)
the y8 is a good motor but a month after i baught my car i spun a rod bearing at 83,000 miles my buddy spun a rod bearing at 86,000 miles like one before me said there is a oiling problem i would go with the z6 to be honest with you.
10-25-2006, 04:44 AM
#16
Former Moderator
Re: d series motor (dowdle)
I've seen a few tidbits of misinfo here:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by petty$rep »</TD></TR><TR><TD CLASS="quote">the reason the Y8 has higher compression is due to a thinner head gasket. Higher compression is better for N/A so it depends on what you plan on doing with the motor. N/A or F.I.</TD></TR></TABLE>
Actually even though the stock Y8 and Z6 head gaskets have different part numbers for their head gaskets, THEY ARE THE EXACT SAME GASKET.
Also stock for stock the Z6 and Y8 both have the same CR ratings. The reason a Y8 HEAD yields more compression on the same block as a Z6 head is the combustion chambers on the Y8 are smaller and more squared. the reaosn both the stock Y8 and Z6 have 9.2:1Cr is because even though the Y8 has smaller combustion chambers, it's pistons are retarded dished to keep the CR at 9.2:1.
Also stock for stock the Z6 head flows better than a Y8 head, but as far as all-out fully ported/polished work the Y8 is supposed to have slightly more potential.
Yes the Y8 trannies have steel shift forks while the Z6 has aluminum, but IMO neither are superior. Aluminum can break, and be replaced - steel bends and you may not realize that it's slightly bent and it could misalign gears and cuase grinding for a while - someone did already touch on this, and it is correct.
Now my own personal opinion on whether to get a D16Y8 or D16Z6:
Get a D16Z6.
Why?
In my 6 years of working at this shop (we only work on Hondas/Acuras) I have replaced way more D16Y8 engines due to knocking rods than I've ever replaced D16Z6 engines. I personally think D16Y engines are not as strong as the older D motors.
Above all IMO the early D16A6 blocks are bar none THE strongest SOHC D engines. You cannot argue against iron main caps. Hell if you find one and rering it and then slap on the VTEC head of your choice you'll have higher CR than a Z6/Y8 block/pistons because the A6 pistons are not as dished as Z6 or Y8 pistons.
The problem with Z6 and especially A6 blocks is that they will be older, and certainly more miled up and possibly in need of a good hone/re-ring job, but honestly I'd feel safer running this way than trusting a low mileage Y8 engine that'll probably take a **** before 120,000 miles.
Now I'm sure someone can chime in ans swear allegiance to their Y8 and that's fine too, but I've seen what I've seen and my opinion can't be changed now.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by petty$rep »</TD></TR><TR><TD CLASS="quote">the reason the Y8 has higher compression is due to a thinner head gasket. Higher compression is better for N/A so it depends on what you plan on doing with the motor. N/A or F.I.</TD></TR></TABLE>
Actually even though the stock Y8 and Z6 head gaskets have different part numbers for their head gaskets, THEY ARE THE EXACT SAME GASKET.
Also stock for stock the Z6 and Y8 both have the same CR ratings. The reason a Y8 HEAD yields more compression on the same block as a Z6 head is the combustion chambers on the Y8 are smaller and more squared. the reaosn both the stock Y8 and Z6 have 9.2:1Cr is because even though the Y8 has smaller combustion chambers, it's pistons are retarded dished to keep the CR at 9.2:1.
Also stock for stock the Z6 head flows better than a Y8 head, but as far as all-out fully ported/polished work the Y8 is supposed to have slightly more potential.
Yes the Y8 trannies have steel shift forks while the Z6 has aluminum, but IMO neither are superior. Aluminum can break, and be replaced - steel bends and you may not realize that it's slightly bent and it could misalign gears and cuase grinding for a while - someone did already touch on this, and it is correct.
Now my own personal opinion on whether to get a D16Y8 or D16Z6:
Get a D16Z6.
Why?
In my 6 years of working at this shop (we only work on Hondas/Acuras) I have replaced way more D16Y8 engines due to knocking rods than I've ever replaced D16Z6 engines. I personally think D16Y engines are not as strong as the older D motors.
Above all IMO the early D16A6 blocks are bar none THE strongest SOHC D engines. You cannot argue against iron main caps. Hell if you find one and rering it and then slap on the VTEC head of your choice you'll have higher CR than a Z6/Y8 block/pistons because the A6 pistons are not as dished as Z6 or Y8 pistons.
The problem with Z6 and especially A6 blocks is that they will be older, and certainly more miled up and possibly in need of a good hone/re-ring job, but honestly I'd feel safer running this way than trusting a low mileage Y8 engine that'll probably take a **** before 120,000 miles.
Now I'm sure someone can chime in ans swear allegiance to their Y8 and that's fine too, but I've seen what I've seen and my opinion can't be changed now.
10-25-2006, 04:51 AM
#17
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Re: d series motor (B18C5-EH2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C5-EH2 »</TD></TR><TR><TD CLASS="quote">I've seen a few tidbits of misinfo here:
Actually even though the stock Y8 and Z6 head gaskets have different part numbers for their head gaskets, THEY ARE THE EXACT SAME GASKET.</TD></TR></TABLE>
Are you sure about that? I know you can use one on the other, but I thought there was a difference.
I'm running a Y8 gasket on my Z6 because Honda was out of the Z6 ones & the Y8s were a lot cheaper.
Actually even though the stock Y8 and Z6 head gaskets have different part numbers for their head gaskets, THEY ARE THE EXACT SAME GASKET.</TD></TR></TABLE>
Are you sure about that? I know you can use one on the other, but I thought there was a difference.
I'm running a Y8 gasket on my Z6 because Honda was out of the Z6 ones & the Y8s were a lot cheaper.
10-25-2006, 05:04 AM
#18
Former Moderator
Re: d series motor (Everyones Hero)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Everyones Hero »</TD></TR><TR><TD CLASS="quote">
Are you sure about that? I know you can use one on the other, but I thought there was a difference.
I'm running a Y8 gasket on my Z6 because Honda was out of the Z6 ones & the Y8s were a lot cheaper.</TD></TR></TABLE>
I've laid one of each on top of each other and they are exactly the same minus a few little tabs that have no bearing on the use of the gaskets. The coolant/oil passages, cylinder holes, etc. all line up perfectly.
...and as far as CR goes the head gaskets thicknesses are identical, so someone saying a Y8 head gasket makes the Y8 have more compression than a Z6 is incorrect.
Oh and lastly hell yes the Y8 gasket is cheaper - that's why my SOHC engine has one on it instead of the Z6 one.
Are you sure about that? I know you can use one on the other, but I thought there was a difference.
I'm running a Y8 gasket on my Z6 because Honda was out of the Z6 ones & the Y8s were a lot cheaper.</TD></TR></TABLE>
I've laid one of each on top of each other and they are exactly the same minus a few little tabs that have no bearing on the use of the gaskets. The coolant/oil passages, cylinder holes, etc. all line up perfectly.
...and as far as CR goes the head gaskets thicknesses are identical, so someone saying a Y8 head gasket makes the Y8 have more compression than a Z6 is incorrect.
Oh and lastly hell yes the Y8 gasket is cheaper - that's why my SOHC engine has one on it instead of the Z6 one.
10-25-2006, 05:20 AM
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Re: d series motor (B18C5-EH2)
I knew all of the holes lined up, I just thought there was a difference between their thicknesses.
It doesn't matter to me, I'm running the cheaper Y8 on my boosted Z6 anyway.
It doesn't matter to me, I'm running the cheaper Y8 on my boosted Z6 anyway.
10-25-2006, 06:13 AM
#21
Former Moderator
Re: (H22+LSD-EJ2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H22+LSD-EJ2 »</TD></TR><TR><TD CLASS="quote">i heard the z6 heads are better and the y8 blocks are better</TD></TR></TABLE>
The Y8 blocks are better if you mean better like they start rod knocking about 100,000 miles too soon.
The Y8 blocks are better if you mean better like they start rod knocking about 100,000 miles too soon.
10-25-2006, 06:36 AM
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alot of people like the z6. just because it has less problems apparently. i cant tell but yeah the y8 has a better stock header,y8 also i hear has better forks for the tranny,y8 has better flowing IM. thats some of the differences ive heard.
10-25-2006, 06:51 AM
#24
Former Moderator
Re: (USDMej1)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by USDMej1 »</TD></TR><TR><TD CLASS="quote">the y8 has threads for knock when you tune it... </TD></TR></TABLE>
Who uses knock when they tune it? Honestly most programs are based on a P28 ECU, and the P28 doesn't even look for a knock sensor.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by big-cat »</TD></TR><TR><TD CLASS="quote"> i cant tell but yeah the y8 has a better stock header.</TD></TR></TABLE>
Well again this is my opinion, but I've seen more cracked Y8 stock exhaust manifolds than i've ever seen from the Z6s. I'll check but I think honda may have even extended their warranty coverage on the Y8 manifold due to premature cracking. I know the Y7s were total **** with the cat in them, but I think the Y8 had documented issues too.
Anyways the stock manifold isn't really a plus because who doesn't buy a header these days?
</TD></TR></TABLE>Who uses knock when they tune it? Honestly most programs are based on a P28 ECU, and the P28 doesn't even look for a knock sensor.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by big-cat »</TD></TR><TR><TD CLASS="quote"> i cant tell but yeah the y8 has a better stock header.</TD></TR></TABLE>
Well again this is my opinion, but I've seen more cracked Y8 stock exhaust manifolds than i've ever seen from the Z6s. I'll check but I think honda may have even extended their warranty coverage on the Y8 manifold due to premature cracking. I know the Y7s were total **** with the cat in them, but I think the Y8 had documented issues too.
Anyways the stock manifold isn't really a plus because who doesn't buy a header these days?
