lobuxracer

iTrader: (2)

Until someone can show me improved KCLV with the AOS, I'm not convinced it does anything useful. Maybe if you followed the factory recommendations for break-in and permanently screwed your engine it will help, but if you have good ring seal, I don't see where the AOS does anything useful.

Leander311

iTrader: (2)

At CoTA, after three 20min sessions in 95F heat, my F immediately started smoking later in the evening sessions after the AOS had become full.

Joker4096

iTrader: (2)

That's because the intake was sucking up straight oil from the AOS and burning it up. A member here dynoed his car with a full AOS and lost tons of power. Cleared the can, reset the ECU and then made some great numbers.

lobuxracer

iTrader: (2)

Does your engine normally burn oil between changes? If you are filling a catch can that quickly, it really sounds like the oil control rings are not doing their job.

Joker4096

iTrader: (2)

This makes sense but there are so many cases of people filling these things up constantly. I'm curious if the motor has extremely wide ring gap. Does the TIS say?

lobuxracer

iTrader: (2)

TIS has a spec. Where your engine fell is a matter of production tolerances. Hard to say, but I would suspect some engines are worse than others just like all production engines.

lobuxracer

iTrader: (2)

I did some detective work tonight and discovered something very interesting. The IS F and RC F have the same ring end gap specs through all model years available on TIS. The GS F has different, and much tighter specs from 2016 to present. See attachments. Now - does the GS F's tighter spec eliminate the need for a catch can? It surely might. For the not so faint of heart, it might make sense to retrofit GS F pistons and rings into an IS F block for more power (only a tiny bit) and for less blowby (maybe a lot). Notice the standard gap on the oil control ring is HALF what the IS F and RC F specify. That's very significant for oil control!

RRRacing

iTrader: (1)

Its normal to fill up the AOS. Lets say you do 4 track sessions and fill up oil to say about 1/5 quart... that is not something you would notice on the dip stick. Also, the oil that accumulates in the AOS is not clean... you will find its black, so its not just oil, but consists of blow-by, fuel wash, moisture, and volatile contaminants that vaporize at high oil temps.

The best way to reduce AOS intake at track days is to (1) run oil cooler to reduce oil temps, (2) keep the level about 3/4 on the dip stock, and (3) use higher viscosity oil like 5w40.

Rafi

Leander311

iTrader: (2)

I've only had her since June so don't know. But I did immediately change the oil upon purchase with Mobil1 EP at the recommendation of another forum member who owns an RCF and also works as a tribologist. You were involved in that thread as well IIRC.

Including the two track days in the TX heat (ten 20 min sessions in total), I'm down about half a quart in 6k miles. I'll probably settle on 8-10k OCI's pending UOA feedback.

Edit: FWIW, it was previously a 1-owner car, that I'd verified, through the Lexus maintenance database, got regular 5k changes at Lexus w/full synthetic.

Leander311

iTrader: (2)

Also arguably, use an oil with lower NOACK volatility value...and as I'd learned the hard way, mind that AOS fill level!!!

Agree oil temps probably have a big impact. At said CoTA track days, I actually went into limp mode during my middle session due to high oil and coolant temps. Think I even had a message about high transmission temps. Hope I didn't cook my ATF... I thankfully sourced a used RR Racing oil cooler here and will definitely have it installed before next summer.

Leander311

iTrader: (2)

Pretty fascinating, Lance! Why would the tighter specs be GS-F specific? Doesn't the 2UR-GSE spec match identically between RC-F and GS-F otherwise?

I also like their if/then tree - "If the gap is too large, replace the rings... if still too large, replace the block." lol.

jdmSW20

iTrader: (12)

I got the RR racing AOS a couple months ago. I don't track my car and I drive spirited every now and then and I too had the oil pool up right at the edge of the PCV like all the other ISF pics, not a lot but it is indeed there. Got the AOS and it does have some build up inside but not as much as the guys who track their ISF

But no way I could do a break in on a car I got used or known if it was an issue prior too. So ill say its working so far

lobuxracer

iTrader: (2)

There is something fundamentally wrong with your car. I ran Carolina Motorsports Park in 102F heat and didn't cause this kind of problem. CMP is well known as the hardest track in the Southeast for brakes, so there is a whole lot of engine abuse going on. Four major braking zones every 2 minutes. I still never saw limp mode.

Also, the oil recommendations floating around this site are not all they're cracked up to be. You might want to take a look at https://540ratblog.wordpress.com/201...-test-ranking/ before running Mobil 1 EP over standard M1. It doesn't provide anywhere near the same protection. I am regretting putting M1 EP in my two engines for this reason. I've already seen issues with cam lobe wear in my 2UR and that was running standard M1.

Leander311

iTrader: (2)

Fascinating reading! As a mechanical PE myself, that guy impresses the snot out of me. I'd also wager he's somewhere on "the spectrum" to put that much time and energy into something so... finite... and yet outside his actual profession. That's to say, he argues he is the most qualified person to rank oils and yet isn't a tribologist by trade. I wonder what Terry Dyson thinks of his work.

That said, he's clear to point out his rating system represents a snapshot in time with new oil. M1EP is designed to be a long-fill oil, meaning its ranking vs regular M1 may very well flip on its head after 5k miles or perhaps even a few hot track sessions. To be fair, this is my interpretation after just skimming for 15 minutes. As much as I'd love to read about PCMO all Turkey Day, at some point I have to be more focused on peanut oil and fry a damn 25lb turkey!!

Interesting observation re: regular M1 and your cam wear btw. Was it a flavor that did well on his chart?

Happy Thanksgiving everyone!

-Nick

PS - yes there very well might be something wrong with the car, as the person who sold me my oil cooler did so because the dealer found what was "really wrong" with his cooling issues just after he'd installed it. I've also read of others here having heat issues in hot climates after most power-adders are tacked on. I'll note it was much more an issue at CoTA than Harris Hill despite similar air temps.

lobuxracer

iTrader: (2)

What appears to be recent M1 is in the highest category. M1 EP is not even close.