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#90
by
libbydiesel
on 29 May, 2018 13:46
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Fuel won't make its way to the exhaust. Carbon will be present in the exhaust and when the engine is cold, you would likely get water condensation. A mix of the two might be what you are seeing. You might also get oil from the turbo if the drain is not properly done or if you have excessive crankcase pressure.
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#91
by
LabradorSteak
on 30 May, 2018 01:37
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I dont know about the crankcase pressure but the turbo should be draining properly. I assume that if it was the turbo leaking that I would see some oil in the intake manifold. Condensation could definately be it.
Thanks, I will update it if I figure anything out.
Matt.
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#92
by
libbydiesel
on 30 May, 2018 01:56
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Can you post some pics of your oil return line? Is there anywhere in the line that the ID is less than 3/8"? Any p-trap valleys? Does it enter the sump above oil level? Is the drain within 15° of vertical (6:00)?
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#93
by
LabradorSteak
on 31 May, 2018 12:24
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I look at it a get some pictures today.
Matt.
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#94
by
LabradorSteak
on 01 Jun, 2018 03:11
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Here is a picture of my oil drain from my turbo. I ran the engine with some of the charge tubing off and held my hand over/infront of the turbo outlet and couldnt find any evidence of oil. I also held a white rag over the outlet and didnt get any oil. I sealed the exhaust manifold so I cant tell if there is still liquid coming out.
The drain tubing uses all 1/2' fittings and hose. It does sag and reenters the block where the stock oil return line did.
https://imgur.com/a/djTRNXmMatt
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#95
by
libbydiesel
on 01 Jun, 2018 12:58
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That valley could be an issue. It will always be filled with oil and even normal crankcase pressure can prevent it from draining properly. The seals on the turbo shaft are not positive seals but rather like little piston rings and so if there is any issue with proper drainage, they will happily allow oil to pass freely.
Here's a good video:
https://www.youtube.com/watch?v=5TYZChIdy14Notice that he does not even raise the drain hose above the bottom of the center cartridge, and oil just pours out around the shaft. Granted, the turbo in the video does not have a piston ring seal installed, but even with one installed, the oil would leak out around the shaft with a p-trap in the line.
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#96
by
LabradorSteak
on 03 Jun, 2018 01:17
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Thanks that was a very informative video. I definately have a dip in my line. I assumed that I was good because the line is bigger than stock but it is also longer. I will keep an eye on the exhaust and oil level. I pulled the charge tube and there wasnt any signs of oil on the wall of the tube. Since I sealed the exhaust leak I am not able to easily see if the liquid is still there. It will have to make it out to the turbo. Hopefully I will be taking the boat to the river this weekend or early next week and it will get a full stress test.
Thanks, Matt.
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#97
by
ORCoaster
on 03 Jun, 2018 15:46
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Stress it don't break it. You have too much into it not to enjoy the fruits of your labor.
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#98
by
libbydiesel
on 03 Jun, 2018 18:37
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I look forward to hearing about the results.
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#99
by
LabradorSteak
on 01 Jul, 2018 23:09
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I have the boat running but have only run it on the trailer on the ramp so far. With the jet pump that I have hooked up to it I am only able to get 2500rpm with no boost showing on the gauge. I may have the gauge hooked up wrong but when I have run the boat out of the water and no resistance on the engine I cant feel much if any air blowing out of the turbo. I have a gt2052. Should I be seeing boost by 2500rpm? How can I make this turbo make more boost down around 2000-2200?
Thanks, Matt.
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#100
by
LabradorSteak
on 01 Jul, 2018 23:13
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Also, will making more boost with the same amount of fuel result in less smoke or more smoke? Right now it is smoking a little gray smoke at idle (more than I want). There is soot on the back of the boat and the exhaust is exiting below the waterline so it is being filtered.
Matt.
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#101
by
libbydiesel
on 02 Jul, 2018 20:29
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The amount of boost you make revving the engine without load will be minuscule compared to the same rpm under load.
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#102
by
LabradorSteak
on 03 Jul, 2018 16:14
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The maximum Egt I got was 740f and that was at full throttle for about one minute. I am thinking about turning the fuel screw up to see if it helps. How high is safe for constant running and how high should my limit be?
Matt.
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#103
by
LabradorSteak
on 03 Jul, 2018 16:57
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#104
by
libbydiesel
on 03 Jul, 2018 19:07
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Was that full throttle under load (propeller pushing water) or just in neutral? Boost and EGTs will both be significantly different with the engine under LOAD than at the same rpms full 'throttle' in neutral.