[beater90]

first off, cervan, I give you props for having the courage to even do a diy and post it up, good job:TU: But, dude, I cringed when I saw you grab that sledge hammer...lol I thought you were kidding, but then, wham! and then again, wham! I just saw in my minds eye that aluminum breaking right off....

 

[cervan]

first off, cervan, I give you props for having the courage to even do a diy and post it up, good job:TU: But, dude, I cringed when I saw you grab that sledge hammer...lol I thought you were kidding, but then, wham! and then again, wham! I just saw in my minds eye that aluminum breaking right off....

lol, it sounds bad but its really not hitting that hard. I guess i could have done it with a rubber mallet, that would be smarter :TU:

 

[guest]

for high rpm and high power builds its a very good idea to do this, maybie not so much the shimming part, but the porting part is very important On turbocharged builds your going to have a 10psi drop in pressure across the board, so its a good idea to atleast shim it to bring it back up to stock pressures. The y8 pump has smaller diameter ports and the crankshaft is like the a6 crankshaft with only one oiling hole, the fourth rod and main are allways the first to spin because of this.

I didn't lose 10psi of oil pressure after turbocharging.....
the y8 ports look exactly the same, i didn't measure them, but they look exactly the same other then the hole I was talking about.

if the oil comes in from the mains and through the crank to the rods, what does it matter if it just has the one oil hole. o wait you mean two holes on the main journals? as in it would get oil twice every 360 degrees instead of just once? yeah but the a6 doesn't have the same issue with spun bearings like y8's do.

 

[cervan]

I didn't lose 10psi of oil pressure after turbocharging.....
the y8 ports look exactly the same, i didn't measure them, but they look exactly the same other then the hole I was talking about.

if the oil comes in from the mains and through the crank to the rods, what does it matter if it just has the one oil hole. o wait you mean two holes on the main journals? as in it would get oil twice every 360 degrees instead of just once? yeah but the a6 doesn't have the same issue with spun bearings like y8's do.

Rod bearings only have one oiling hole And your correct, you will only get oil once every revolution instead of twice the rod bearings are also lubricated by whatever oil pressure is left from the main bearings, so it may be less than what the mains are seeing. the diameter of the output passage is smaller on the y8 pumps, its measurable ill post some pics up.

You will loose a certain ammount of oil pressure, let me clarify that 5-10 psi, it goes from build to build. since your simply "leaking" oil back into the pan from the oil gallery.

 

[guest]

Rod bearings only have one oiling hole And your correct, you will only get oil once every revolution instead of twice the rod bearings are also lubricated by whatever oil pressure is left from the main bearings, so it may be less than what the mains are seeing. the diameter of the output passage is smaller on the y8 pumps, its measurable ill post some pics up.

You will loose a certain ammount of oil pressure, let me clarify that 5-10 psi, it goes from build to build. since your simply "leaking" oil back into the pan from the oil gallery.

are you talking about the mains only having one hole or the rods. your sentences look like your forgetting to use commas. the a6 and y8 have one main hole or rod hole? what cranks have two? please post pics of the output port on the y8 being smaller. all my parts are at school.

it does make sense your losing a little pressure to feed the turbo, never thought about that. it's to late on my build. but my pressure where fine before the rebuild so I'm not to worried. my oil gauge isn't working all of a sudden so I can't give my current pressures.

 

[guest]

press crl/esc, then alt/m, then alt/f4, then u .

 

[cervan]

yeah im a little tired, just got back from portland.

A6 crankshafts only have one oiling hole for the main bearings and rod bearings. (same a y8 crankshaft)

z6 has two oiling holes for both main and rods.

Y8 stock oil pump output passage diameter

Z6 stock output passage diamtmeter.

The difference is small but it means alot for flow.

here is what the end result should look like.

 

[guest]

have you measured the I.D. on the outputs?
does that z6 pump have the same input hole as the y8?

 

[cervan]

The other huge difference between the two generations of SOHC is the oil displacement of the pumps, or volume. According to the 92-95 and 96-00 manuals, the earlier generation oil pump displaces 11.89 gallons/minute at only 6000 rpm. The 96-00 oil pump displaces only 8.8 gallons/min at 6800rpm. In basic terms, the Y8 oil pump has 35% less flow and doesn't reach max flow until nearly 1000 rpm later than the Z6. To me, thats a pretty big difference, and for a turbo motor thats a huge difference.

That is a quote i found on turbod16.com

 

[Max713]

it looks good in my shop

 

[guest]

The other huge difference between the two generations of SOHC is the oil displacement of the pumps, or volume. According to the 92-95 and 96-00 manuals, the earlier generation oil pump displaces 11.89 gallons/minute at only 6000 rpm. The 96-00 oil pump displaces only 8.8 gallons/min at 6800rpm. In basic terms, the Y8 oil pump has 35% less flow and doesn't reach max flow until nearly 1000 rpm later than the Z6. To me, thats a pretty big difference, and for a turbo motor thats a huge difference.

That is a quote i found on turbod16.com

hmmm, so the 88-91's flow the same 11.89 too? I have to find this info. something has to be done. using a y8 pump is scaring me.

 

[cervan]

i belive that the a6 oil pump would have close to the same numbers as the z6 pump.

 

[guest]

I'd rep, but I have to spread it around.

 

[Aeroflux]

Oh hellz ya! Just what I needed, rep for you Cervan! [edit: Crap, need to spread some rep around. No worries.]

 

[TurboK2x]

can this oil pump mod handle a d16a6 to rev up to 8600rpm with supporting mods??

 

[BrockGrimes]

Y8 stock oil pump output passage diameter

Z6 stock output passage diamtmeter.

Are these 2 pumps interchangable? Or will the Z6 pump make to much pressure/volume and blow out seals?

 

[cervan]

Are these 2 pumps interchangable? Or will the Z6 pump make to much pressure/volume and blow out seals?

The y8 and z6 pumps will fit on each other motor, but the y8 has the dipstick cast into the pump, where as the z6 doesnt. You will need to find a way to check the oil level of your engine if you swap the oil pumps.

 

[guest]

it doesn't make sense to me why increase the pressure would do anything. Increasing flow would increase pressure on a positive displacement pump. increasing pressure, not even just allowing that valve to open later, isn't going to increase pressure unless the pump can flow more and is being held back. which is what I think the problem is. it obviously is cause the y8 pumps displacement is less. cause at 50 psi of pressure if the pump could handle it would be enough to supply the system. the pump stock can't even handle that. or it wouldn't burn up bearings.

Has anybody really looked at the rotors? are they different at all?

 

[cervan]

it doesn't make sense to me why increase the pressure would do anything. Increasing flow would increase pressure on a positive displacement pump. increasing pressure, not even just allowing that valve to open later, isn't going to increase pressure unless the pump can flow more and is being held back. which is what I think the problem is. it obviously is cause the y8 pumps displacement is less. cause at 50 psi of pressure if the pump could handle it would be enough to supply the system. the pump stock can't even handle that. or it wouldn't burn up bearings.

Has anybody really looked at the rotors? are they different at all?

rotors are the same. Pressure is good to increase since when pressure increases, so does flow. Just like on a turbo.

 

[guest]

rotors are the same. Pressure is good to increase since when pressure increases, so does flow. Just like on a turbo.

The rotors are not the same. The A6 and I'm sure the z6 with the 11.X displacement and a bigger diameter outer rotor. which gives it more displacement. for whatever reason the y8 went with a lower displacement pump and the one oil hole on the journals because it has the same displacement pump. using a two oil hole crank would probably cause it to lose pressure.

it makes no sense to shim it if it's not flowing any more. its just a relief valve, it has to flow to X pressure before it relieves the pressure.