But with a slight port and deshrouded valves, the y8 will flow superior to the z6 or y7.............klungemonger said:What's up dudes. kommon_sense has a link in his sig on SHO that directs you to the old d-series.org board (which you can't post on but can still read.) It has pics and stuff and a description of the difference between the intake port shape.
Basically says the Y8 makes more power lower in teh range due to better swirl & combustion efficiency, but when you're going all out the Z6 ends up better for hp due to better top end flow capability. The Z6 has symmetrical intake tracts, the Y8 has curved/shaped ports where the left/right for each cylinder are different from each other.
Ive read/heard differently........oh well 8)TeamDragonSpeed said:I got into this discussion a while back. Basically the PnP work changes the flow efficency but not the flow characteristics. Or in other words the z6 head still better up top.
I fail to see how grinding in the chamber will improve flow through the ports...they are designed to direct more air through one valve than the other. Massive recongifuration of the runners seems to be the solution. Sharpen up that carbide bit... :wink:Toddnos said:But with a slight port and deshrouded valves, the y8 will flow superior to the z6 or y7....
just curious and kinda OT....can u swap the y8 valvetrain on the y7 head since it has the same casting?Guest500 said:the y7 is the same casting as the y8. the y7 and z6 heads have the same volume, which is more than that of the y8.
I wondered the same thing. I think it would fit but the VTEC solenoid mount and proper oil passages aren't machined onto a Y7 casting I don't think. Someone enlighten me if you know different...krAzySi said:just curious and kinda OT....can u swap the y8 valvetrain on the y7 head since it has the same casting?Guest500 said:the y7 is the same casting as the y8. the y7 and z6 heads have the same volume, which is more than that of the y8.
I doubt there are any compatible valvetrain parts, especially from VTEC to non-VTEC. I suppose it's possible maybe on the exhaust side, but probably not with intake side.Hondadog said:Good question. I had a ? kind of like that about using the y5 roller rockers in the y7 head. I have heard that the y5/7/8 between 96-98 Were the same castings except of course the chamber design/cc's, valvetrain.
which valves are getting more air?? would this affect nitrous use? I only wonder, because i have had a few things go wrong under nitrous conditions with my y8 head.......blown #2 exhaust valve.......50 lbs lower comp. in the #3....klungemonger said:I fail to see how grinding in the chamber will improve flow through the ports...they are designed to direct more air through one valve than the other. Massive recongifuration of the runners seems to be the solution. Sharpen up that carbide bit... :wink:Toddnos said:But with a slight port and deshrouded valves, the y8 will flow superior to the z6 or y7....
I don't think so. Typically nitrous ruins stuff due to lack of enough fuel, or failure to retard timing to prevent detonation. Nitrous can burn stuff like valves and rings. IT doesn't require any special flow to be delivered properly, since it doesn't increase the volume of air going into the cylinders, only the percentage of oxygen.Toddnos said:which valves are getting more air?? would this affect nitrous use? I only wonder, because i have had a few things go wrong under nitrous conditions with my y8 head.......blown #2 exhaust valve.......50 lbs lower comp. in the #3....
Word.....thats what i thought.......But which cylinders are getting more air with the y8 head?klungemonger said:I don't think so. Typically nitrous ruins stuff due to lack of enough fuel, or failure to retard timing to prevent detonation. Nitrous can burn stuff like valves and rings. IT doesn't require any special flow to be delivered properly, since it doesn't increase the volume of air going into the cylinders, only the percentage of oxygen.Toddnos said:which valves are getting more air?? would this affect nitrous use? I only wonder, because i have had a few things go wrong under nitrous conditions with my y8 head.......blown #2 exhaust valve.......50 lbs lower comp. in the #3....
Ah, now I see what you're getting at. The cylinders are all getting the same amount of air, the uneven runners are in each cylinder. The intake port configuration of each cylinder is the same, there are 2 ports that split off inside the main intake port of each cylinder, the issue is that all the left intake ports have a certain shape while the right side has another. It's to create a high-swirl condition in the chamber which atomizes fuel better and gives more economy. But for high hp you want volume and velocity, not swirl, so in that instance you'd want 2 even high-flowing ports.Toddnos said:Word.....thats what i thought.......But which cylinders are getting more air with the y8 head?
OK i see..........I had my head ported, by a guy that used to work for PYR racing.......I think he match ported the smaller runner to the bigger one.........I need to know if he widened the other runner as well.....He said it was mildly done.....klungemonger said:Ah, now I see what you're getting at. The cylinders are all getting the same amount of air, the uneven runners are in each cylinder. The intake port configuration of each cylinder is the same, there are 2 ports that split off inside the main intake port of each cylinder, the issue is that all the left intake ports have a certain shape while the right side has another. It's to create a high-swirl condition in the chamber which atomizes fuel better and gives more economy. But for high hp you want volume and velocity, not swirl, so in that instance you'd want 2 even high-flowing ports.Toddnos said:Word.....thats what i thought.......But which cylinders are getting more air with the y8 head?
