Aussie skypig

Displaying my ignorance once again.
Am I correct, in understanding the engine in the 987.1 is “turned around” from the installation in the 911? (The crank end facing forward would be facing rear in the 911)

Does this mean the well documented oil starvation would occur during sustained high G LEFT hand corners?

I’m about to order a “Ultimate Integrated Dry Sump UIDS v2.2”
https://rennlist.com/forums/996-foru...v2-2-a-63.html

jscott82

My data shows mainly right hand corners... I see issues both ways but right hand seems to be much worse.

harveyf

Do you plan on tracking or racing the car with super sticky tires? If not, I'd suggest that your purchase may be overkill. But this oil starvation issue is a volitile topic, I'm sure you'll get lots of opinions.

Aussie skypig

I agree. Very likely overkill. My plans are track days on road tires only at this stage.
Still, I feel like this is a forever car, and apart from cost, there are no downsides?

And if it saved any damage, ever, - cheap!

harveyf

In that case, we are on the same page. My current 2007 Cayman S is built to be track capable, but will only run on street tires. My build includes a Hartech deep sump, which is overkill on street tires. Upon the advice of Brandon at Slakker Racing, I am going with the stock AOS. I have a manometer setup and will track sump vacuum as a regular engine health item.

I would be curious, knowing that you have a Jake Raby engine, was that build by him a "track" build? I know he charges quite a premium for his track builds and is somewhat circumspect about what all they do. Did it come to you with a stock sump and a stock AOS?

Hal

A long read, but well worth your time. And a possible solution.

SlakkerRacingDev

The UIDS, along with a couple of other options, has shown very good data and will help protect your engine from on track oil starvation. Using a high quality 50W oil filled to the max fill line, keeping it fresh, and keeping oil temps below 245F are a few other keys to engine health.

sasilverbullet

Is that with stock AOS, or the UAOS?

SlakkerRacingDev

Either. I've done quite a bit of on track testing with the stock OEM AOS overfilled by as much as 1.75 quarts and am confident it can handle being filled to the max fill line. After extensive conversations with Skip, I no longer recommend overfilling without using the UAOS and we now offer it as an option on our engine builds.

SlakkerRacingDev

I got this emailed to me the other day and it's a good example of early warning signs of spinning a rod bearing. 987.1S running 40W oil, .5 qt deep sump, EBS baffle, UAOS, 4-6 track days per year.

GLTHFJ60

The LN Engineering UAOS or the porsche motorsports AOS?

RJ80

Is that with regard to increased copper and slightly low oil viscosity?

Do you think any deep sump/baffle combination is adequate on its own to prevent engine damage on track, given the issues of failure we've seen reported here with other deep sump/baffle "solutions"?

SlakkerRacingDev

Charles "Skip" Brazeel's UAOS

Yes. Both the Hartech Racing Sump and LN 2qt deep sump performed well in my testing when oil temps were kept in the 230's, fill level was at max or higher, and a fresh 50W oil was used. I believe the same could be accomplished with 60W oil for temps in the mid 240's. I've also seen data that looked pretty good from the UIDS.

Here is a graph showing the Hartech sump vs a stock sump. The dark green line across the top is the stock sump and everywhere you see it drop down is where the oil pump is sucking air. The bright green line is the Hartech sump.

I've also attached a graph from the Driven catalog that I think does a good job of showing the effect of temperature on viscosity. For track use, you want viscosity to be around 12cSt but no less than 10. XP6 is their 15W50.

Aussie skypig

What tires are you running to encounter the pressure drop? Race/Track type?
Are you running any sort of “deep sump”?

Aussie skypig

”Road and Track performer. Stage II”
I’m not the original purchaser, but the sump looks stock. As is the AOS, as far as I know.
It has a spin on filter installed.
Zero issues - I’m. Looking at the better sump as extra insurance.