Sooo whats up with PTE??

[bison]

I agree totally...........But I did it any way and it fixed it....Doesn't make a bit of sense.

Weve had engines that smoked. Changed everything including rings, rebuilt heads, checked everything out. Seen oil on the ex outlet and sent the new turbo back and when it got back we re-installed with no other changes and guess what it didint smoke. Could have been anything internal. Maybe a bad batch of bearing housings with too much bearing clearance or some other small issue that leaked a lot of oil internally. You would have have to have changed to the -4 and seen the smoking stop then went back to the -6 seen it reappear and back to the -4 to see it stop again before id call it plausible all without sending it back. Once it goes back parts could be changed or something caught and fixed and you never knew what it was.

 

[Blazer406]

I think the line size could have a small part in restricting oil flow to the turbo. It has to do with the line length. Inside the pipe/hose whatever feeding the turbo....there will be a pressure drop......the smaller the line size...the more the pressure drop. Same concept as too small of a electrical cable going to the starter......too small.....and you get a voltage drop on the end by the starter.

With the idea above.....a short supply line would have a smaller pressure drop.....but the line is probably 18" long or so....no? I think it is possible you could see less pressure at the restricter with a smaller line size.

Fire away if I am wrong......

 

[slimtastic]

well my drainback is clean as a whistle...im gonna put a pressure gauge right at the turbo supply line to see what im getting for oil pressure there. past that i think ive got a bad turbo

 

[ijames]

I think the line size could have a small part in restricting oil flow to the turbo. It has to do with the line length. Inside the pipe/hose whatever feeding the turbo....there will be a pressure drop......the smaller the line size...the more the pressure drop. Same concept as too small of a electrical cable going to the starter......too small.....and you get a voltage drop on the end by the starter.

With the idea above.....a short supply line would have a smaller pressure drop.....but the line is probably 18" long or so....no? I think it is possible you could see less pressure at the restricter with a smaller line size.

Fire away if I am wrong......

Just saw this and had to run some numbers . I used the viscosity of 10 wt oil at room temp since I found that before I found 30 wt at 200 F -)) and this will show the trend. For a 0.040" orifice 0.125" long a flow rate of 0.1 gal/ min results in a pressure drop of 10.7 psi, and 1.5' of 0.2" ID tubing at the same flow rate has a pressure drop of 1.7 psi. So 85% of the pressure drop is across the .04" orifice and 15% across the tubing. If the orifice is 0.1" the drop would only be 0.4 psi and only 20% of the pressure drop would be across the orifice. So it really depends on how small the orifice actually is, and it better be pretty small.