Oil Coolers?

[steved0x]

Originally Posted by Need_for_speed

Am I on target with my analysis that overheating is the primary issue, or should I still consider a deep sump or accusump?

.

From my data collected at hpde events, as oil temp goes up, so do pressure dips caused by g forces, and overall oil.pressure is lower as well.

On cooler days where the water temp stays pegged at 180, the oil gets to around 205-210, and pressure dips are greatly reduced. I see this at Roebling with lots of non full throttle sweepers.

A track like the firm, with lots of lower speed WOT and less cooling time, the oil heads up to 220-230, maybe getting close to 240. Pressure dips are worse.

New for the last time, I bypassed my failed rad fan ballast resistor on the left side so the fan runs on high anytime it is on, I set the AC on 75 and ran it at low, which ran the driver side fan at high and the other on low. This helped keep the car cooler, I would flip.it on partway through the session and could watch the temp come down. If I flipped it on a cool down lap, temps came down pretty fast.

I am.going to fix the ballast resistor so it doesn't run on hi all the time, and wire a switch to jumper the hi speed relays so I can run them.both on demand. It will be interesting if this works to keep the oil cooler.

Before messing with the oil cooling side I am going to maximize the water side. Maybe there is a better rad fan I could put on?

Edit: I run the 2 QT LN deep sump, and spin on oil adapter, those are my only oiling mods.

[Need_for_speed]

Steve, what oil were you running with?

Please allow me some dumb questions: would running with a higher viscosity oil for track work ameliorate the pressure dips? Would a high viscosity oil handle the heat better and cut down on aeration?

I like the idea of having a switch to run the fans on high on demand and I could swear that someone on the forum did just that. I'll have to do a search.

[steved0x]

Originally Posted by Need_for_speed

Steve, what oil were you running with?

Please allow me some dumb questions: would running with a higher viscosity oil for track work ameliorate the pressure dips? Would a high viscosity oil handle the heat better and cut down on aeration?

I like the idea of having a switch to run the fans on high on demand and I could swear that someone on the forum did just that. I'll have to do a search.

I saw one theory, if a street car runs the oil typically at 200F, and on track it gets to 240F, they find a viscosity that at 240F has the same (I don't know the right word, "thickness?") as their usual street oil at 200F. On rennlist somewhere.

Mobile 1 5W50 is approved for our cars and Napa runs sales from time to time. A lot of folks run that on rennlist, and I guess being a 50 it has more "protection? I wish I knew the right word" at higher temp than a 40?

I am using Millers Nano 5W40, I just recently did my first oil change after 5900 miles and around 10 months (would have to check my records to very the dates) and it still had plenty of TBN and the rest of it was good as well. My initial plan was to draw a sample at 3000 miles and get a uoa but I forgot

At a 6000 mile interval, which was all hpde and driving to/from the track, dollarwise it is cheaper than the DT40 (not designed for track) with a 3000 mile interval. I'm looking forward to my next UOA on the millers, now that I'm on the 2nd fill so less cross contamination from the previous oil.