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Grease base oil viscosity? #4430316
06/13/17 12:30 PM
06/13/17 12:30 PM
Joined: Jan 2004
Posts: 4,142
California
nthach Offline OP
nthach  Offline OP
Joined: Jan 2004
Posts: 4,142
California
Does this matter in certain applications or not really? Does the base oil have the same effects on frictional losses or how a bearing moves dependent on temperature, just like how thinner oils help with fuel economy?

Reason why I ask is that I was reading the data sheet for the grease I used in my bike's hubs - it's repackaged Nemco synthetic grease - NLGI 1.5 with an ISO 460 base oil. I've looked up a few other greases and while the NLGI grade might be the same, the base oil viscosities are different.

Re: Grease base oil viscosity? [Re: nthach] #4430334
06/13/17 01:03 PM
06/13/17 01:03 PM
Joined: Jun 2003
Posts: 2,693
BC, Canada
userfriendly Offline
userfriendly  Offline
Joined: Jun 2003
Posts: 2,693
BC, Canada
The grade may be the same, but the temperature range can be different depending on BOV. For surface transportation, including train wheel bearings, the grease needs to be in grade down to -40.
On the hot end, a higher viscosity BOV may handle higher peak operational temperatures.

Last edited by userfriendly; 06/13/17 01:05 PM.
Re: Grease base oil viscosity? [Re: nthach] #4430358
06/13/17 01:30 PM
06/13/17 01:30 PM
Joined: Feb 2016
Posts: 664
NJ, USA
MotoTribologist Offline
MotoTribologist  Offline
Joined: Feb 2016
Posts: 664
NJ, USA
Varying requirements with regard to load carrying, speed, and operational temperature are all factors in what the best base oil viscosity is for a grease application.

Re: Grease base oil viscosity? [Re: nthach] #4431268
06/14/17 12:41 PM
06/14/17 12:41 PM
Joined: Jun 2002
Posts: 19,229
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,229
Iowegia - USA


Reading is fundamental; understanding is not a given ability.
Re: Grease base oil viscosity? [Re: nthach] #4431269
06/14/17 12:42 PM
06/14/17 12:42 PM
Joined: Jan 2004
Posts: 4,142
California
nthach Offline OP
nthach  Offline OP
Joined: Jan 2004
Posts: 4,142
California
The application this grease is used in is a bicycle angular contact ball bearing with adjustable preload via the adjusting cone. The bike will be ridden in ambient temps up to 100*F, I plan on checking the hubs out of curiosity - would this grease be overkill and I would be better served with a "thinner" grease?

Re: Grease base oil viscosity? [Re: nthach] #4431888
06/14/17 11:37 PM
06/14/17 11:37 PM
Joined: Jun 2003
Posts: 2,693
BC, Canada
userfriendly Offline
userfriendly  Offline
Joined: Jun 2003
Posts: 2,693
BC, Canada
Have a look at Chevron's HD EP #1 not the moly one. In Canada, I use Petro Canada OG-1, it's sorta like Campy grease without the high price. Chevron's offering has very good load carrying and water washout resistance. Prolly make a good boat trailer grease both #1 & 2. BOV is 220 or like a SAE 50 engine oil equiv.

Re: Grease base oil viscosity? [Re: nthach] #4434854
06/18/17 06:03 AM
06/18/17 06:03 AM
Joined: May 2013
Posts: 119
the Netherlands
miro Offline
miro  Offline
Joined: May 2013
Posts: 119
the Netherlands
I think that you will get more help if you pace message in ¨bicycle¨ part of this forum.

As far as I understood you want to reduce bearing losses. Unfortunately they are the smallest part of losses

3...5W - for hubs bottom bracket and pedals. Do you want to reduce them - go wor ceramics bearing and use even lower NLGI grade NLGI 1 or 0. Oli Viscosity keep it high .Your application has DN . More info here - https://www.klueber.com/ecomaXL/files/Lubrication_of_rolling_bearings_tips_and_advice.pdf
30...80W - tire lorring resistnce
the rest is air losses - at 20mph goes to 80% of total power

Tips mor maintanince of cup&cones
- go to fantastic website of Sheldown Brown RIP
https://www.sheldonbrown.com/cone-adjustment.html
https://www.sheldonbrown.com/tooltips/hubs.html
- My experience
- frequent repack of hub is the key of longevity of shimano / campagnolio hubs
- wrong cone adjust is the second factor of failure /after contamination /
- Grease choise depends on your needs
- Lithium - low friction, good low temp performance but easy washed out. Mobilith 220 and 460 are my favorite - for my nice weather race and MTB hub. For sterm and pedals still use Calcuim sulfonate grease
- Calcium sulfonate - Favorite or my all weather commuter. Here in europe I use Total Ceran XM220. http://www4.total.fr/asia-oceania/singap...XM%20220_en.pdf
- AL Baruim complex used in the past but switched to Calcium sulfonate. http://www.belray.com/bel-ray-waterproof-grease

Re: Grease base oil viscosity? [Re: nthach] #4435264
06/18/17 03:50 PM
06/18/17 03:50 PM
Joined: Jun 2003
Posts: 2,693
BC, Canada
userfriendly Offline
userfriendly  Offline
Joined: Jun 2003
Posts: 2,693
BC, Canada
Good post miro, the Pet-Can OG-1 I mentioned above is a calcium sulfonate too, so I think we are both on the same page. Back in the day (way back) I switched to Mavic hubs 'n BBs. I still have a brand new 52cm Merckx I built for a lady, (she passed away 6 years ago) still in the box from 1987 with a Mavic groupo.

Re: Grease base oil viscosity? [Re: MolaKule] #4437207
06/20/17 11:30 PM
06/20/17 11:30 PM
Joined: Dec 2010
Posts: 555
MA
fpracha Offline
fpracha  Offline
Joined: Dec 2010
Posts: 555
MA
Originally Posted By: MolaKule
hello MolaKule, thanks for great info!
As some have mixed oil into mobil-220 grease to get a softer (lower nlgi) grease for their purpose.
When oil is mixed with the grease, air bubbles and air pockets are formed.
Is there a simple method to avoid these air bubbles in the grease ?


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