Royal Purple 20w50, 90 miles, 01 YZ250F

[sunruh]

a batch of purple in the mix master.
once again, another big name (high dollar) oil looses to the 1/4 liter transmission of DOOM!

Royal Purple 20w50 (practice only) for 90 miles in a 2001 Yamaha YZ250F.
Testing done by Blackstone Labs.

INSOLUBLES: .4%
WATER: 0.0%
ANTIFREEZE: 0.0%
FUEL: FLASHPOINT IN F: 420
SUS VISCOSITY @ 210 F: 79.4

ALUMINUM 49
CHROMIUM 1
IRON 9
COPPER 1
LEAD 148
TIN 0
MOLYBDENUM 95
NICKEL 1
MANGANESE 0
SILVER 0
TITANIUM 0
POTASSIUM 1
BORON 6
SILICON 8
SODIUM 4
CALCIUM 2880
MAGNESIUM 11
PHOSPHORUS 832
ZINC 960
BARIUM 0

the high Al is from the clutch pressure plate, the Pb is from the leaded fuel i use.

 

[Killer-B]

quote:

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a batch of purple in the mix master.
once again, another big name (high dollar) oil looses to the 1/4 liter transmission of DOOM!

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Now that was kinda funny

 

[wileyE]

50w's are too thick for those motors IMO. We put 30w redline race in all the race bikes (ducks, 600's and mx strokers).

 

[sunruh]

that's nice.

do you also see 107F ambient temps like we had sunday while i was riding?

 

[KX 455]

quote:

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Originally posted by wileyE:
50w's are too thick for those motors IMO. We put 30w redline race in all the race bikes (ducks, 600's and mx strokers).

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Today's MX THUMPERS,especially a 250f will put a 50wt oil down to a 40wt in a couple hrs. Infact a 50 weight oil might be the ticket in the summer month's,if you work a bike hard. I totally disagree.

 

[wileyE]

40 and 50w is fine for the average consumer who trail rides those bikes and never changes the oil. But if your racing and dumping the oil after every race day like you should, then I stand by my post. Those things make viscosity with rpms and you want the oil back into the sump as fast you can. At the shop I do work for they have just found through testing that particular 30w has proved to be a good balance of shift quality, hp on the dyno, and parts protection on the race motors they build. Take it FWIW, I guess.

 

[sunruh]

how many hours will 30w hold up with 105F+ ambient?

 

[wileyE]

105F ? yep pretty hot. How about 100deg on the pavement at daytona for 200 miles wfo?

 

[sunruh]

that would be about 30-40 degrees colder than what i am talking about.