Racing with Delo

[widman]

I mentioned I'd post this:
Race car is a Toyota, had 60km on a lousy oil to break-in the rebuilt engine before draining and filling with Delo 15w40. This oil has 200 kms of race time on it on a dirt track, mostly at 7500 rpm because a pin broke in the transmission and it wouldn't go into 4th or 5th. At the end of the race the water temp was 110 C, Oil temp 155 C. Track was half dust and half mud. Radiator was blocked for most of the race as car in front wouldn't move out of the way (until nudged) Air filter is racing type, I think too open. Ran on 100 octane aviation gasoline. We are prepping it for this weekend. I know it's group II+, but the oxidation surprised me. (Car came in 3rd).
Iron 62
Chrome 8
Lead 387
Copper 5
Aluminum 15
Ni 0
Ag 0
Silicon 63
Boron 5
Magnesium 23
Calcium 2591
Barium 0
Phos 1265
Zinc 1402
Visc 13.99
Soot 0.1
TBN 7.7
Oxidation 5%

 

[TR3-2001SE]

Now we know what racing does to lead ppm. I would try Redline 10w40 and compare results. Lead and Chrome would come down I would hope. Interesting UOA for sure.

 

[Al]

Looks like the 40 wt wasn't heavy enough and not enough barrrier protection (moly) to protect the bearings.

 

[nicrfe1370]

Since he was running 100 octane aviation gas, which I assume contained lead, then it's tough to say how much of the reading for lead was due to wear, and how much from the gas. Iron and aluminum obviously suffereed from the high silicon due to the air filter, but I can't give an opinion on the lead knowing the gas may be the culprit. I had high wear on a 50wt oil that I used for less than an hour of racing, so I think your lead reading is quite possibly representative of bearing wear.

[ June 09, 2003, 08:21 PM: Message edited by: nicrfe1370 ]

 

[Jimbo]

All of the lead is probably from the fuel. Avgas has more lead than leaded auto gas used to have. Delo has excellent solvent and dispersant properties, so most of the lead would be scavenged from the piston ring area.

Synthetics are a bad idea when running leaded avgas. This was well documented a decade ago when Mobil tried a synthetic oil for piston aircraft engines. Today, Rotax prohibits the use of synthetic oils in 4-stroke aircraft engines running on leaded avgas. Blends are ok.

 

[Bror Jace]

Jimbo, I think that was a problem with the (early) PAO intensive Mobil.

Ester heavy formulas should not have that lead scavenging problem.

--- Bror Jace

 

[MolaKule]

I recommend to some of my racing friends (who don't want a high-cost boutique, custom oil), a 50/50 mix of Schaeffer's #700 and Delvac 1.

Got esters? Got Boron? Got Moly?

 

[widman]

I had forgotten about the lead in the fuel which is:
Tetraetilo de plomo 1.06 ml TEL/ lt. D-3341
Corrosión lámina de cobre 1 D-130
Precipitado de plomo visible 3.0 mg/100 ml. D-873
Azufre total 0.05 % peso D-1266

 

[Bror Jace]

"Tetraetilo de plomo 1.06 ml TEL/ lt. D-3341
Corrosión lámina de cobre 1 D-130
Precipitado de plomo visible 3.0 mg/100 ml. D-873
Azufre total 0.05 % peso D-1266"

OK, now it's all perfectly clear.

Interesting, if a little scary, report. Thanks for posting.

TR3, Widman sells Chevron products in Bolivia. I can't imagine he'd be trying other brands of oil. I'm assuming the test was a "Let'see what happens if ... " situation.

The oil was picked because it should be good in a heavy duty application and he probably sells a lot of it in his neck of the woods.

--- Bror Jace

 

[widman]

Purpose of the analisis was mainly to see how it held up at 155 C and high rpm's. As mentioned, I sell Chevron, and use Delo for racing because it has more zinc and phos than Supreme. As a side benefit I saw that the air filters aren't worth it, so this week we will change filters. I used to use the Supreme 15w50 Synthetic, but never got around to sending in a sample. Since that was discontinued, I went to the Delo.

 

[JohnBrowning]

132 would probably help alot. You might also try running with raceing fuel instead of low lead avgas. This would elimanate bearing wear as an issue.