Quote:
Originally Posted by Ultramaroon
I regret trying to engage in a good-faith discussion. Carry on, sir.
|
??? Do you really think I'm not making my arguments "in good faith"? :'(
Quote:
Originally Posted by Ultramaroon
The coil packs mount to the valve cover and sit inside a tube, all of which are awash in oil, not engine coolant. I agree with you that "might last longer" isn't a compelling argument but that's not exactly what I said. The effects of wide swings in temperature on running components are well known.
|
Are they? Do we really have data to show reliability/lifetime vs. oil temps for components like coil packs?
Quote:
|
Your experience alone is a strong argument. I cringe waiting for the bad news but you just keep motoring along. Gotta hand it to you for sticking to it.
|
Like I said, I looked into it pretty extensively and it honestly seemed to me like the bearing failures people experienced with the earlier cars weren't related to "high" oil temperatures, as plenty of people were having these failures *with* oil coolers. One guy even had his oil temps down to 225F and still had a bearing failure, was trying to figure out how to get even cooler than that!
Quote:
|
The temperature disparity you mention wasn't reported as an actual difference. KillerB observed a difference between their calibrated sensors and the factory sensor.
|
Not uncommon for automakers to calculate/estimate oil temps based on sump temp and other factors. C7 Corvettes would report 320F oil temp under track usage with sensor/sump temp of 285F. It does seem that with our cars the reported temp is perhaps conservatively high relative to sump temp. Personally I wouldn't even be bothered at 275F actual sump temp with good synthetic 5w30, so if it's really 255F I'm even more OK with that.
Quote:
|
I more wonder about the actual temperature rise as the oil circulates through the block after being cooled. I don't know if you know about my oil cooler. It's just a long-running experiment in measuring what it takes to control temps in the widest operating conditions.
|
IMO, oil temps are already well controlled. After I'd done research and decided to do my first track day with the car without an oil cooler, I monitored oil temp and watched it climb over the first couple of laps. At that point I figured I'd bring it in once the oil temp got up to 275F indicated to avoid runaway overheating. But it stopped at just over 270F indicated and held there. It's always held there for me no matter what the ambient temps. If it had continued to climb, I probably would have gotten an oil cooler.
Quote:
Originally Posted by ZDan
Shouldn't be much oil residing between the valve cover and cylinder head... But anyway, if the coils work reliably given the conditions, so what?
|
I'll stand by this. The volume between valve cover and head shouldn't be "full of oil". I *think* that block temp and valve cover temp should track more with coolant temps than oil temps. But in any case the '15+ coil packs seem to be very reliable for track usage with or without an oil cooler. If/when one fails I'll replace it, perhaps replace all of them and figure I'm good for the next 40+ track days and 70k miles.