Y7/Y8 vs Z6 oil pumps: The truth revealed
#1
Seagull Management
Thread Starter
Join Date: Jun 2008
Location: Miramichi, NB, Canada
Posts: 15,150
Likes: 0
Received 24 Likes
on
22 Posts
Y7/Y8 vs Z6 oil pumps: The truth revealed
This is probably coming about 10 years after it really should have been documented but I'm going to post it anyway in the hopes these crazy rumors of the Z6 having better oil pump will finally die.
Y7 on the left, Z6 on the right:
With the covers off:
Bare housings:
Z6 oil pump gears in Y7 oil pump housing:
Relief springs:
Minor difference here in terms of the Z6 having larger studs for the pickup tube:
The real difference is right here, the crankshaft. Note how the Z6 crank (bottom) has two oil holes per journal to the Y7's (top) one. Also note the scored crank where the #4 rod bearing spun.
I hope this will at long last dispel any myths about the Z6 somehow having a superior oil pump, literally the only differences are the pump body due to having different dipstick locations, the Y7/Y8 needing the boss for the CKF sensor, and the Z6 for some reason has larger pickup tube studs (8mm vs 6mm)
Y7 on the left, Z6 on the right:
With the covers off:
Bare housings:
Z6 oil pump gears in Y7 oil pump housing:
Relief springs:
Minor difference here in terms of the Z6 having larger studs for the pickup tube:
The real difference is right here, the crankshaft. Note how the Z6 crank (bottom) has two oil holes per journal to the Y7's (top) one. Also note the scored crank where the #4 rod bearing spun.
I hope this will at long last dispel any myths about the Z6 somehow having a superior oil pump, literally the only differences are the pump body due to having different dipstick locations, the Y7/Y8 needing the boss for the CKF sensor, and the Z6 for some reason has larger pickup tube studs (8mm vs 6mm)
#2
Re: Y7/Y8 vs Z6 oil pumps: The truth revealed
Thanks.
Why did Honda reduce the number of oil holes in the Y7 crankshaft?
Can I assume that the Y8 crankshaft also has only one oil hole?
Why did Honda reduce the number of oil holes in the Y7 crankshaft?
Can I assume that the Y8 crankshaft also has only one oil hole?
#3
Seagull Management
Thread Starter
Join Date: Jun 2008
Location: Miramichi, NB, Canada
Posts: 15,150
Likes: 0
Received 24 Likes
on
22 Posts
Re: Y7/Y8 vs Z6 oil pumps: The truth revealed
My guess is either to save on manufacturing costs or to cut down on parasitic loss to make a little more power. I really don't know for sure, but I do know the Y7/Y8 really is more prone to spinning rod bearings.
Yes it does, exactly the same crank and rods as a Y7. And on that note, something else I found was the Y7 and Z6 rods are also the same. The Z6 does not as some people have said for years have "beefier" rods)
Yes it does, exactly the same crank and rods as a Y7. And on that note, something else I found was the Y7 and Z6 rods are also the same. The Z6 does not as some people have said for years have "beefier" rods)
#4
#6
Seagull Management
Thread Starter
Join Date: Jun 2008
Location: Miramichi, NB, Canada
Posts: 15,150
Likes: 0
Received 24 Likes
on
22 Posts
Re: Y7/Y8 vs Z6 oil pumps: The truth revealed
Thanks Ron I intended to do this myself but hadn't gotten to it yet.
Yes. That was actually the reason the Y7 crank came out. I didn't know it had a spun bearing till after I took it apart, the Z6 crank was strictly meant to be a preventative measure as the engine is going in a circle track car.
It can't The holes in the Y7/Y8 crank are drilled at approximately a 45° angle. The Z6 crank on the other hand have the holes drilled at a right angle to crank and they go clear through from one side to the other.
Basically if you want a Y7/Y8 that will take the same abuse a stock Z6 will swap over a Z6 crank.
It can't The holes in the Y7/Y8 crank are drilled at approximately a 45° angle. The Z6 crank on the other hand have the holes drilled at a right angle to crank and they go clear through from one side to the other.
Basically if you want a Y7/Y8 that will take the same abuse a stock Z6 will swap over a Z6 crank.
#8
Technical Hero
Join Date: May 2002
Location: Charlotte, NC, 28227
Posts: 9,876
Likes: 0
Received 28 Likes
on
20 Posts
Re: Y7/Y8 vs Z6 oil pumps: The truth revealed
Any idea where these numbers were derived from? In searching around I can't really find a source but if you search for "D series oil pump flow rates" it pops up every where, its probably where most of those ideas originated from:
D16A6 Oil pump flows 46.4 qt/min@6250rpm
D16Z6 Oil pump flows 47.6 qt/min@6000rpm
D16Y8 Oil pump flows 35.3 qt/min@6800rpm
D16A6 Oil pump flows 46.4 qt/min@6250rpm
D16Z6 Oil pump flows 47.6 qt/min@6000rpm
D16Y8 Oil pump flows 35.3 qt/min@6800rpm
#9
Seagull Management
Thread Starter
Join Date: Jun 2008
Location: Miramichi, NB, Canada
Posts: 15,150
Likes: 0
Received 24 Likes
on
22 Posts
Re: Y7/Y8 vs Z6 oil pumps: The truth revealed
None. Somehow I'm guessing the flow wasn't measured at the pump. The pumps use the same gears, same relief spring, they have the same size passages so the idea that the Z6 pump somehow flows an extra 12qt/min is ludicrous to me.
Thread
Thread Starter
Forum
Replies
Last Post
jdmf23accord
Honda Civic / Del Sol (1992 - 2000)
14
12-03-2010 06:09 PM