Twin Turbo LS Boat Engine
#141
Ok,Commodore rear hump LS1 sump, 9 litre oil capacity with the big water cooled cooler which is worth mentioning is mounted up quite high behind my seat-could that be an issue? I used Penrite 10w 40 semi synthetic oil, it was running about 60psi oil pressure or a bit more when thrashing along, but I did notice the first practice run we did after about 5 minutes of going hard oil pressure started to drop and was starting to get near or below the magic figure of 10 psi per 1000rpm. We had to stop for another reason and when we got going again after 10-15 minutes the pressure was running higher again. The oil temp stays real cold, not sure of the figure but the gauge only just gets off the mark. I did make a mistake where the sender unit for oil pressure gauge is taken, I put it in the provision on the oil cooler adapter block down by filter, it seems obvious now I should have had it coming off the top rear of the engine which is where the turbo feeds come off, **** I hope my turbos got oil! Not on much of an angle once up on the plane,not an issue for others running LS engines.
Last edited by Huffa; 08-06-2016 at 02:29 PM.
#142
9 Second Club
Are you having to pump the oil high to this cooler ? Do you have any logs of oil pressure ? or only occasional glance at a gauge ?
Oil temperature ? you say cold....exactly how are you measuring and where ? Is it actually in the oil flow somewhere decent ? Or at a dead end ? Before or after the cooler ?
Oil temperature ? you say cold....exactly how are you measuring and where ? Is it actually in the oil flow somewhere decent ? Or at a dead end ? Before or after the cooler ?
#143
Yes the cooler is highishO, sits about my shoulder height behind my seat, no logs of pressure but always watch it and it normally sits about 60psi or so, but when it shat out the pressure slowly dropped probably 20psi, then zero at idle.Oil temperature is taken in the bottom of sump, wouldn't have gone past 180-200 degrees max
#145
The lines are about a metre long, they attach to the engine/sump via an adapter like this, 10an hoses, provision to bolt on by the oil filter
http://www.trademe.co.nz/motors/car-...1137344053.htm
http://www.trademe.co.nz/motors/car-...1137344053.htm
#146
9 Second Club
It probably isnt the problem....
But when I had to go to a remote mount filter due to my turbos down there...the only way I could maintain an oil gallery no smaller than those within the engine...ie 1/2" diameter was with -12 hoses.
-10 fittings can step down to 7/16" or less at their smallest, despite what any actual hose measurements may be
-10 would have been easier though -12 is ******* big lol.
Ultimately unless you know for sure you've always had good pressure...good oil...oil temps were fine ( ie datalogs proving all this ) it will be hard to know why it went wrong.
And if you arent logging these....time to start.
If the oiling system appears fine....could there be an issue with the stuff bolted to the crank ? ie whatever drives the boat ? an imbalance or something there could cause strange problems.
But when I had to go to a remote mount filter due to my turbos down there...the only way I could maintain an oil gallery no smaller than those within the engine...ie 1/2" diameter was with -12 hoses.
-10 fittings can step down to 7/16" or less at their smallest, despite what any actual hose measurements may be
-10 would have been easier though -12 is ******* big lol.
Ultimately unless you know for sure you've always had good pressure...good oil...oil temps were fine ( ie datalogs proving all this ) it will be hard to know why it went wrong.
And if you arent logging these....time to start.
If the oiling system appears fine....could there be an issue with the stuff bolted to the crank ? ie whatever drives the boat ? an imbalance or something there could cause strange problems.
#150
9 Second Club
#151
Ok I will talk to the tuner about setting something up on the Link Storm ECU. I might have to spend the $$$$ and set up a dry sump system, although plenty of LS3's running CX class all wet sumps
#152
How does the accumulator attach to the engine and how does it exactly work?
#154
9 Second Club
And pretty sure it can also offer a safety based on oil pressure ( although that would likely kill the engine to help prevent major damage
#158
8 Second Club
iTrader: (4)
Do you know where your oil level is when the engine is running? Could you be having windage issues? Beating the oil into a frothy mess with the crank hanging down in it? Do you run the OEM windage shield? Sucking up foamy oil is super hard on bearings...
Crank scraper might help a little too. If the crank isn't hanging down into the oil...
Crank scraper might help a little too. If the crank isn't hanging down into the oil...
Last edited by Forcefed86; 08-13-2016 at 08:11 AM.
#159
9 Second Club
#160
Yes I run the windage tray. Not sure of level while it's running. It did blow oil out breathers severely, oil all over rear of boat, that why I ask if the shitty rings couldn't handle 7psi and started blowing bad, could that hold a heap if oil up and then start pushing it out breathers?