The experimental results show a clear distinction
between the oils where the avocado, olive, canola, and peanut oils all have the lowest
COF values (between 0.02 and 0.10), while sesame, vegetable, corn, and safflower oils
all have the highest COF values (between 0.30 to 0.50). Figure 4.1(b) shows the variation
of the COF for various natural oils at the completion of the test. Here, it is clearly
illustrated that avocado oil has the lowest COF value of the natural oils tested.
Re: Avocado oil base stock.
Posted: 25 Jan 2021, 05:13
by godlameroso
The trends shown in Fig. 4.4(b) are in agreement with Fig. 4.3(b), where
avocado oil demonstrates the lowest wear rate and corn and vegetable oil demonstrate the
highest wear rate at both ambient and high temperature testing conditions.
PG 131
Re: Avocado oil base stock.
Posted: 25 Jan 2021, 05:16
by godlameroso
Re: Avocado oil base stock.
Posted: 25 Jan 2021, 05:22
by godlameroso
Through a chemical
composition analysis, tribological analysis, and thermogravimetric analysis, the influence
of fatty acid content in natural oils revealed the following conclusions:
Avocado oil was shown to have the best tribological properties with the lowest
friction and wear at ambient and high temperature conditions.
Re: Avocado oil base stock.
Posted: 25 Jan 2021, 12:34
by Sieper
I always knew Daniel Avocado was the most slick of them all.
Re: Avocado oil base stock.
Posted: 25 Jan 2021, 13:37
by godlameroso
Interesting study they go on to include additives to improve performance of the oil. Such as hBN and WS2, and also compare it to ionic liquids, which I didn't even know was a thing. Sadly they did not try IF-WS2 as that is supposedly the latest and greatest motor oil additive.
Neat avocado oil outperformed a synthetic group 5 motor oil in terms of wear protection and COF by a decent margin, and was even better with a rudimentary additive package consisting of nanoparticles.
Neat avocado oil outperformed a synthetic group 5 motor oil in terms of wear protection and COF by a decent margin
Incredible stuff. Avocados are a rather expensive fruit, wouldn't avocado oil be rather expensive for an industrial product?
Very. It's $7 US for 250ml, or $28 per liter. Or $150 for enough to do an average oil change. Maybe you get a bulk discount but then you need to spend more for your additive package.
It's even more expensive than Tribodyn oils. That company's oils are ~$60 USD per gallon.
Re: Avocado oil base stock.
Posted: 25 Jan 2021, 18:57
by Big Tea
The experience I have had with these oils at high(ish 130c maybe) temperature has always resulted in a high 'film' build up on the surface with any temperature change. So much so that even daily periods leave them needing a skim and clean out.
I realise the OP says 'base' but it is what it is as far back as it goes.
Re: Avocado oil base stock.
Posted: 25 Jan 2021, 21:59
by godlameroso
Isn't oil film a good thing? Seasoned cast iron pans are much easier to clean and cook with than unseasoned.
Most base stocks are lousy lubricants on their own, they need an additive package to be worth anything.
That stuff handles heat like no other. Would be a great base stock.
Castor bean oil has certainly proven itself to be so, & for over a century...
Re: Avocado oil base stock.
Posted: 26 Jan 2021, 13:11
by Tommy Cookers
castor oil ie Castrol R was mandatory for the (4 stroke) BSA 500cc Gold Star road motorcycle made until 1963
(though not ? for the similar Velocette 'Thruxton' that took over the same road/race niche until 1970)
both were 'old-style' aircooled designs having rolling-element bearings and corresponding (low-flow ?) lubrication design
castor oil's USP was outstanding attraction/retention by metal that might amount to outstanding film strength (if needed)
yes R oxidised rapidly in use and coated the engine internally with 'varnish'
yes the exhaust had a unique smell when the engine was hot
castor oil ie Castrol R was mandatory for the (4 stroke) BSA 500cc Gold Star road motorcycle made until 1963
(though not ? for the similar Velocette 'Thruxton' that took over the same road/race niche until 1970)
both were 'old-style' aircooled designs having rolling-element bearings and corresponding (low-flow ?) lubrication design
castor oil's USP was outstanding attraction/retention by metal that might amount to outstanding film strength (if needed)
yes R oxidised rapidly in use and coated the engine internally with 'varnish'
yes the exhaust had a unique smell when the engine was hot
The 'varnish' had to be wiped off with methylated spirit or the small galleries became blocked, also the return pipe into the top of the oil tank grew a 'stalactite'.
When the goldie was retired I still could not resist dropping a cap full into a tank of fuel just because I was addicted to the small (boy racer)
(boy racer)