d16z6/d16y8
02-19-2007, 03:43 PM
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d16z6/d16y8
im just wondering the difference between these motors the y8 is sohc vtec also right? is there a major factory horsepower difference or why does it seem that more people want the y8 over the z6?
02-20-2007, 06:19 AM
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Re: d16z6/d16y8
The oil pumps on y8's shit out on you and you'll end up spinning rod bearings. Watch your ass.
z6 > y8 imo.
They're both capable of the same power from what I've seen. What car is it going in?
z6 > y8 imo.
They're both capable of the same power from what I've seen. What car is it going in?
02-20-2007, 06:50 AM
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Re: d16z6/d16y8
i have z6 in my eg6 right now and im getting ready to boost i was going to swap to y8 if it was any better but i guess not! will the y8 head fit a z6? i need a head and cant find good z6 heads around here!
02-20-2007, 07:22 AM
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Re: d16z6/d16y8
your z6 distributor will not bolt to a y8 head. the y8 head has smaller combustion chambers the the z6.
02-20-2007, 09:10 AM
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Re: d16z6/d16y8
I have always been told that the extra metal in the y8 head, makes up the quench area.
Its supposed to squirt the a/f mixture to the middle of the combustion chamber for more efficiency.
Its said that it also helps to suppress predetination by keeping the a/f mix away from the sides of the chamber where hotspots might develope. i believe its called a pentroof style chamber. the b18c5 head has a similar chamber. the intake runners on the y8 head are not straight. the port splitter is angled to create a swirl in the chamber for better efficiency.
Also, you can boost the Y8 no problem, but if you do pick up a Y8 I'd re-shim the oil pump or buy a high flow, because those oil pumps are really restrictive and don't give the proper lubrication under high RPM's.
You can use the Y8 head on a Z6 but the head stud issue, the upper left stud on a z6 is raised where as the y8 studs are all the same height. Meaning you would need to use 9 y8 studs, and 1 z6 stud or it will strip the threads in the block when you drive the car.
Its supposed to squirt the a/f mixture to the middle of the combustion chamber for more efficiency.
Its said that it also helps to suppress predetination by keeping the a/f mix away from the sides of the chamber where hotspots might develope. i believe its called a pentroof style chamber. the b18c5 head has a similar chamber. the intake runners on the y8 head are not straight. the port splitter is angled to create a swirl in the chamber for better efficiency.
Also, you can boost the Y8 no problem, but if you do pick up a Y8 I'd re-shim the oil pump or buy a high flow, because those oil pumps are really restrictive and don't give the proper lubrication under high RPM's.
You can use the Y8 head on a Z6 but the head stud issue, the upper left stud on a z6 is raised where as the y8 studs are all the same height. Meaning you would need to use 9 y8 studs, and 1 z6 stud or it will strip the threads in the block when you drive the car.
02-20-2007, 10:14 AM
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Re: d16z6/d16y8
i have the z6 right now and i was told that it got rebuilt right before i bought it but when compression tested i only got 135 psi across all cylinders? i thought stock was around 180 psi!? would it still be safe to boost this motor with no more than 6 pounds and tuned on crome?
02-26-2007, 07:51 PM
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Re: d16z6/d16y8
i have the z6 right now and i was told that it got rebuilt right before i bought it but when compression tested i only got 135 psi across all cylinders? i thought stock was around 180 psi!? would it still be safe to boost this motor with no more than 6 pounds and tuned on crome?
02-27-2007, 10:55 AM
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Re: d16z6/d16y8