Accusump - some data

[seningen]

Originally Posted by AZ986S

First event of the 2018 fall season for me in Arizona at Arizona Motorsports Park (AMP). I tested my new Sparco EVO seats and 6 point harness setup and was able to get my personal best time in the 3rd session. What a difference that setup makes!

I also decided I would attempt to quantify the effectiveness of my 2 qt Accusump setup to see if it makes any difference. I used my Autosportlabs Race Capture Track setup with AnalogX reading oil pressure and Accusump ON solenoid voltage.

This data was taken from Session 2. In order to minimize any noise (such as the effect of oil temp on oil pressure), I turned the Accusump OFF then back ON on adjacent laps (laps 2 and 3). I'm assuming that my driving is similar for those 2 laps as well. I'll post a rendered video with data for the same laps when I have some time.




The X axis is basically time, with the Lap count showing as a stair step at the bottom. In Blue, I'm showing the voltage of the Accusump solenoid. Spikes indicate it is activated (and dumping oil during that short time). The Orange points show the Oil Pressure as measured at the inlet of the oil filter (so not directly at the oil pump). And lastly, in Grey, is the Oil Pressure as measured at the standard location on the passenger's side cam cover (head). Outside air temp was roughly 75F and oil temperature did not climb beyond 225F. I was running Federal RSR595 tires and lateral Gs were getting up to 1.05-1.15 Gs. I also have an X51 style oil baffle.

Although this is only a single data set at a single track, I think it's pretty clear that the Accusump has a measurable effect. What I can see is that the VC Oil pressure never dips below 27 psi vs 22 psi when Accusump is OFF. Looking at the Pump Oil pressure, it never dips below 44 psi, but dips to 30 psi when turned OFF. This larger effect on Pump oil pressure can be explained by the fact that the Accusump feeds into oiling system much closer to the oil filter than to the pump, and there is a check valve that helps to build up the back pressure.

Is it worth it? Will this prevent oil starvation? I don't know, but just looking at this, it certainly doesn't make it worse.

Let me know what you think

PS... I don't have any relationship with Canton Racing so I'm not biased on way or the other. I just believe in the power of data

Thank you for taking the time to share the data.

Mike

[AZ986S]

Here is the data comparing the NAPA 1042 filter with the Canton Racing Billet style oil filter, older style with Hex bolt on the bottom. The whole idea behind a racing filter is more flow and less restriction (pressure drop), sometimes at the expense of filter particle size efficiency.





For the NAPA 1042, the data was taken in March 2018 at AMP.
For the Canton Racing, the data was taken just las week October 2018.
Both clockwise. Air temps about the same.
In both cases, I only considered the data for the last 2 laps of the session so as to have engine temp as steady and high as possible, and also only considered the Accusump Air Side Pressure as being the equivalent of the Post Oil Filter pressure when it was oiling (valve open). The NAPA 1042 is rated at 21 microns and 9-11 GPM, and the Canton Racing filter element is rated at 8 microns and 15 GPM.

I was surprised to see that the NAPA 1042 filter did somewhat of a better job, and about the same for the Pressure Delta across the filter. It then dawned on me that the 1042 has an anti-drainback valve whereas the Canton does not. This is important and can affect the effectiveness of the Accusump by eliminating the oil back flow when the Accusump is oiling. This also could explain the higher pressure values and lower standard deviations for the 1042.

What's interesting also is the negative pressure delta across the oil filter. But after giving it some thought, I believe that makes sense since that would happen when the Accusump is oiling initially when the Pump pressure is low from the sudden lateral G load.


This does not mean the Canton Racing filter is no good. It just means that for my set-up, it does not work better than the NAPA 1042 (at least from the limited data).