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post #11 of 15 (permalink) Old 05-18-2012, 10:19 AM Thread Starter
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Gear oil weight vs Motor oil weight

75w-90 gear oil is pretty close in viscosity to 10w-40 motor oil at operating temperature (~210F)

The reason for the different numbering system between motor oil and gear oil is that they each have different standards of measurement.


Code:
MOTOR OIL GRADES:

SAE Motor (ENGINE) grade             ISO grade @40C            Cst @100C (assume same as 210F)
 
                    0                                                     -3.8 
                    5                32 = 28.8 to 35.2             3.8 to 4.1 
                    10              46 =  41.4 to 50.6             4.1 to 5.6 
                    15                                                 
                    20              68 = 61.2 to 74.8              5.6 to 9.29 
                    30              100 = 90.0-110                 9.3 to 12.49 
                    40              150  = 135 - 165              12.5 to 16.29                    
                    50              220 = 198-242                 16.3 to 21.89                    
                    60              320  = 288-352                21.9 to 26.09 
      
      

GEAR OIL GRADES:

SAE GEAR Grade                       ISO grade @40C            Cst @100C (assume same as 210F)
 
                    70                                            4.1+ 
                    75                                            4.1+ 
                    80               68 = 460 = 414-506          7.00 to 11.00 
                    85              ~100                         11+ 
                    90               220 =680 = 612-748          13.5 to 23.99 
                    140             ~500 = 1000 = 900-1100       24 to 40.99 
                    250              1500 = 1350-1650            41+
Oil viscosity, viscosity index, SAE, SUS, Cst, shock and suspension fluids


In the table above, compare the Cst rating for 10W-40 motor oil (SAE grade 10 and 40), and compare that to the Cst rating for 75W-90 gear oil (SAE grade 75 and 90).... they're pretty close.

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post #12 of 15 (permalink) Old 05-18-2012, 04:16 PM
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Cool

And another viscosity chart,,,,,,,
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post #13 of 15 (permalink) Old 05-08-2013, 07:48 PM
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post #14 of 15 (permalink) Old 04-23-2015, 02:24 AM Thread Starter
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Big Twin Primary Oil

Dexron III ATF.

Along with auto transmissions, Dexron III is also used in chain driven 4x4 transfer cases (NP207, NP208 etc)...

After all, what is in an automatic transmission? Clutches, bearings etc... ATF is also used in chain driven transfer cases (NP 207/NP 208) that have.... chains.

Sounds like a HD primary to me.... Kind of looks like one too:

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Mala Ipsa Nova
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'05 Carbed Night Train
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post #15 of 15 (permalink) Old 08-12-2016, 06:18 PM Thread Starter
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Quote:
Synthetic vs Non-Synthetic Motorcycle Oils At Start-Up!
Written By: Steve brewdude Garn
8-11-2016
Categorized in: News






It was a COLD winter morning in the winter of 2016! How cold of a morning? It was -10F. That COLD! So, why am I just now telling you what happened last winter? Lets go back to that cold day. I was out, working in the shop, and the heater was set at 50 degrees. Now, that may sound cold to most of you, but when the weather stays so cold for a long period of time, 50 degrees is actually comfortable (at least to me). I had a TIG welding class that day and a student asked what was covered up outside the front door of the Brew Shop. It was an oil delivery from Spectro. When I left the night before it was dark and I just plain forgot to bring it in. The student asked, what does leaving it in the cold do to oil? I started telling him how it would be very thick and that the oil would be as thick as molasses in a cold motorcycle engine.

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Now, we started chatting about motorcycle oil vs. automobile oil, and then synthetic vs. non-synthetic oils. I know people say I use this car oil and mine doesnt have any problems. But, you know, motorcycle oils are made for air-cooled, high revving performance engines. I know someone that brought a tail light for me to put on his bike. It was a beautiful piece of workmanship and cost him over $300 plus shipping. Yet, the same person would not spend the extra money for oil made for motorcycles. I just dont get it. I love working on engines and making them go faster. I have been building my own race engines for 43 years and am now packing to head to Bonneville to race an engine I built. A few extra dollars on the oil makes sense to me.



Oh, back to the story about that cold winter morning. The student asked how thick the oil really is and I thought it would be great to see for myself. The delivery from Spectro included two cases of oil, both 10w40. One case was synthetic and the other non-synthetic. The student (lets just call him Bob), Bob asked if there was any difference between the two on how thick they would be. I thought for a minute and said, Well, there shouldnt be, they are both 10w40.

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At that time, I noticed a mason jar in the front window, and yes, it was empty! So, I took this empty Mason jar and asked Bob to time how long it took to fill it to the top with the oil. I had some oil already in the shop, which again was 50F degrees and I still didnt want to go out and get THAT COLD, so, we tested these first. The non-synthetic I poured first and it took 5.20 seconds. Next, I poured the synthetic and it timed out at 3.90 seconds. Same make oil, only one was synthetic and the other was non-synthetic. So yes, there was a difference which surprised me. But I still was thinking the times to pour out the oils at -10F degrees would be close.



As I went out to get the other two cases of oil left out all night, the bag the delivery man put them in was now covered with snow and ice. I kicked and beat at it and it finally came loose and I brought it in to the now seemingly HOT 50F shop! The first -10F degree oil was the conventional, non-synthetic, 10w40. It took so long to pour out! A whopping 23.50 seconds to be exact. Then, it was time to test the synthetic 10w40. It only took 11.75 seconds.



What a HUGE difference! Back to why I am just now telling you what happened. Soon, the nights will get cooler and then cooler days. After seeing these results, what oil are you thinking about running? I now use synthetic for all seasons, in all my bikes. I think it is worth the few extra bucks. You?

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Till next time,

Steve

BREW Bikes LLC


Synthetic vs Non-Synthetic Motorcycle Oils At Start-Up!

Mala Ipsa Nova
Psalm 144:1 Luke 22:36

'05 Carbed Night Train
111 rwhp, 112 rwtq
Best 1/4 ET 12.557s
Best 1/4 MPH 108.59
Kainam is online now  
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