What to do with oil cooling?
Posted: Tue Jul 04, 2017 12:02 am
Gentlemen,
The traffic seems a bit slow on this forum, but I try anyways as there are some very knowlegdable people here that have helped me a lot earlier.
I have a couple of threads in here from building and fixing my 2110cc oxyboxer, and currently, after another failure, I have it up an running quite nicely.
The issue I have now, is related to oil cooling.
I am running without a doghouse cooler; just an external one (not a very big one either) mounted under the car, next to the gearbox. A friend of mine made a drawing where he indicates that the air flow under the car goes something like this: The red line indicates how mine is currently placed.
What I experience is that at idle I have good oil pressure, 3-4 bars at idle, that rises approximately 1 bar per 1000 rpm.
But after some 20-30 min on the road, the oil temp has risen steadily to about 230°F, and it keeps rising. I do not know if my temp guage is 100% accurate, but the temp keeps rising, and at this point, the idle pressure is around 0.7 bar, and it goes down as temperature goes up.
I am using a sandwich plate between the case and the filter with a thermostat. I also tried removing the thermostat so that all oil flows through the cooler always.
I have bought aother cooler, that I was planning on installing on the other side of the gearbox, but this time maybe lying down, and using a scoop on the underside to direct air flow. Something like this: There are other options, like placing a cooler up front under the bumper, or even in the spare wheel well, but I am trying to minimize body work hatching.
Any proposals as to what I can do to improve this?
I am very happy with the engine apart from this. Good low end torque and a decent sting at the top. I want to keep improving the engine, especially with better heads, but I want to get this issue under control first.
Here are som quick specs on the engine
-Stock, balanced crank
-Scat I-beam rods
-Wiseco 94mm pistons
-FK 8 cam
-Thorsten Pieper lifters and bushings
-CB los Panchitos 043 heads
-Pauter 1:1.3 rockers
-Oteva 90 springs
-38mm VW speed parts throttle bodies
-Microsquirt ECU
The traffic seems a bit slow on this forum, but I try anyways as there are some very knowlegdable people here that have helped me a lot earlier.
I have a couple of threads in here from building and fixing my 2110cc oxyboxer, and currently, after another failure, I have it up an running quite nicely.
The issue I have now, is related to oil cooling.
I am running without a doghouse cooler; just an external one (not a very big one either) mounted under the car, next to the gearbox. A friend of mine made a drawing where he indicates that the air flow under the car goes something like this: The red line indicates how mine is currently placed.
What I experience is that at idle I have good oil pressure, 3-4 bars at idle, that rises approximately 1 bar per 1000 rpm.
But after some 20-30 min on the road, the oil temp has risen steadily to about 230°F, and it keeps rising. I do not know if my temp guage is 100% accurate, but the temp keeps rising, and at this point, the idle pressure is around 0.7 bar, and it goes down as temperature goes up.
I am using a sandwich plate between the case and the filter with a thermostat. I also tried removing the thermostat so that all oil flows through the cooler always.
I have bought aother cooler, that I was planning on installing on the other side of the gearbox, but this time maybe lying down, and using a scoop on the underside to direct air flow. Something like this: There are other options, like placing a cooler up front under the bumper, or even in the spare wheel well, but I am trying to minimize body work hatching.
Any proposals as to what I can do to improve this?
I am very happy with the engine apart from this. Good low end torque and a decent sting at the top. I want to keep improving the engine, especially with better heads, but I want to get this issue under control first.
Here are som quick specs on the engine
-Stock, balanced crank
-Scat I-beam rods
-Wiseco 94mm pistons
-FK 8 cam
-Thorsten Pieper lifters and bushings
-CB los Panchitos 043 heads
-Pauter 1:1.3 rockers
-Oteva 90 springs
-38mm VW speed parts throttle bodies
-Microsquirt ECU