Every time I see this IMHO I hear the sound of an English teacher I had saying " You don't have to say that. Of course it your opinion. You said it.".
On diyAudio "IMHO" means "I acknowledge that what I'm saying might not be 100% correct".
Many many statements here, without IMHOs, are brave and bold assertions backed by the supreme confidence of the writer (but perhaps not by known science). "Often wrong but never in doubt".
Many many statements here, without IMHOs, are brave and bold assertions backed by the supreme confidence of the writer (but perhaps not by known science). "Often wrong but never in doubt".
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You must not have looked very hard: turbocharging, cylinder deactivation, variable valve lift, 8 plus speed automatics, start-stop systems, aero enhancements, low drag brakes, et al are ubiquitous. I worked in the field for nearly 40 years and not much desk sleeping was evident to me.
Christopher Hitchens was challenged, "That's your opinion", to which he quizzically replied "Who else's would it be?"
I was retained by an oil component manufacturer to conduct testing to determine the effect of lowering ZDDP in oils on flat cam follower life, and in pursuit of this I was involved with lubricant testing at SWRI. During that time, much of the facility which could test maybe a hundred engines simultaneously was involved doing testing for either major oil companies or one or more of the big 3 US auto manufacturers. The tests were to measure various oils and cam profiles for wear with different cam geometries and follower systems (ASTM-D6891,6984), the target of the test series was to increase life before failure.
It was precisely these types of tests which in 1996 led to the development and adoption of a new API standard for oils (Cat SJ) with lowered oil ZDDP concurrently with the widespread adoption of roller follower systems to allow use of the new oil formulations.
And all of this was driven by the US-EPA's mandating OEM's warranty coverage for cataclysmic perverters be extended...so sure, ensuring bottom line is a primary goal of engineering....
So many advances in oil technology are driven by engine requirements, and vice versa.
Cheers,
Howie
"Cataclysmic perverters"
Isn't spellcheck wonderful?
Jn
For horological apps, the problem is the time train is always stop/start. Too high a viscosity, energy robbed. Too low, metal to metal.
Sometimes, letting the oil gum up is a good thing, it stops the clock before wear can set in.
And in all this, dust gets in and starts abrasion.
Had fixed two clocks for a neighbor...when she had Reno work done, I told her to stop the clocks. The house had plaster demo'd, man that is major dust.
Isn't spellcheck wonderful?
Jn
For horological apps, the problem is the time train is always stop/start. Too high a viscosity, energy robbed. Too low, metal to metal.
Sometimes, letting the oil gum up is a good thing, it stops the clock before wear can set in.
And in all this, dust gets in and starts abrasion.
Had fixed two clocks for a neighbor...when she had Reno work done, I told her to stop the clocks. The house had plaster demo'd, man that is major dust.
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Most of what is done is to placate the governing bodies, more engineering headcount accompanies tax benefits usually, and for marketing. I will say that electronic injection/ controls have helped the internal combustion engine, turbos too. Tire technologies have evolved more than I would have imagined for performance anyways.
My sleeping commentary had more to do with the compliance side within large companies more than what is done to actually make a product that the people will desire and purchase.
I was speaking more to the details such as tires and oil specs before, but didn’t make that clear.
The "FlexUnit" drivers by Welcome to the AudioTechnology website are modular mechanics where the magnet is screw-mounted with stand-offs independently from the basket with the cone/spider assy. and can be easily removed/adjusted. Alas, those are rather expensive custom-shop drivers...
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I typed that one in intentionally, it is a silly habit I have of twisting phases...
There are major advances being made in light-duty hydrodynamic bearing systems. As you point out, there is a design viscosity which allows for proper operation, just as there is in an ICE. There are new highly polar surface coatings which when used in conjunction with polar lubricants can ensure retention of light-weight oil in the bearing/journal gap.
I have been working with a Belgian manufacturer on this issue as applied to ICE lubrication and it is amazing how modern organic chemists can custom design a molecule with has enough unterminated bonds to be polar and stick where you need it as well have good solvency, without excessive free radical scavenging or auto-oxidation. It is beyond my pay grade...
Cheers,
Howie
I understood every single word you said, I recognized them all.
That said, the combination of all those words in that last paragraph?
Sigh.😱
When I first started researching oils for clocks, the lit out there was not very strong. Once they got past whale oils, it seemed like everyone had a specific magic oil. They don't even mention weight in any catalogs for clock repair materials. The only place I saw weight mentioned was a synthetic nano oils vendor. They put 90 nanometer bucky's in the formulation, and sell 85, 10, and 5 weight.
Jn
Nice link, thanks. Pricey? Whoa, 300 and change for a four incher..
Then again, nobody could afford my products at all..
(Even at two dollars an hour)😀
Jn
I trust him, for sure, but I don't know what he had chosen as a comparison base:: the voltage on the coil or the acoustic power. Reactive power rulez.
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I missed this. What was the conclusion ? The first breaking frequency is higher in current mode or equal ?
Not sure. I just remember there was a shift. I think it was PMA who posted the plots.
Jn
Incredible!!!
Price comparison US/Switzerland, rough basis 1 quart = 1 liter, and 1 US$ ($) = 1 Swiss Franc (CHF):
- Mobil 1 5w 30, 6 quarts at Costco: $27.99
- Mobil 1 5w 30, 5 liters for CHF 99 at Car Care King (cheapest I can find in Switzerland, normally CHF 129)
Life is really good for you guys from the US!
I prefer that version. Evil things. Put back engine development 10 years.
I've stripped out a few lathe and plaster ceilings. Horse hair and all. Yup. Dust everywhere.
Compliance teams work very hard, even if they make mistakes (VW V10 diesel was a classic as they tested on euro spec diesel, not US). Sometimes they work tooo hard. It takes a lot of effort to code your ECU to recognise you are on an emissions test rig 🙂.
In UK our dealer model is different so cars are shipped with the tyres specified by the manufacturer as well as the exact lube package. With modern modular engines a warrantly claim is entire engine replacement, which is to be avoided wherever possible.
My last car had the VAG 'Pumpe Duse' with injector and pump combined. Whilst this doesn't allow 2000bar+ injection pressures and 5 squirts per cycle that other tech allows* it was incredibly reliable but required a special oil. Wrong oil, dead engine.
*Diesel tech got silly in last 10 years. Even before the emission scandal and European politicians realising they'd been idiots in promoting diesel too much tech was being thrown at a combustion cycle for which one of the biggest benefits was the engine was dead simple. An injector with enough pressure to cut through a car bonnet that requires lots of tech that goes wrong is missing the point. I drive a diesel because a family member was selling one and the price was right. Would not buy new. But then again would never buy a new car anyway 🙂
Mobil 1 is very well priced in the US in the large jugs if you buy it from Walmart or Costco. It's usually something like $10 per quart from an auto parts store if they don't carry the larger containers.
The ESP is a different formulation targeted at diesels, probably one reason why it is more expensive. If the Castrol Edge with the approval is available and less expensive, I'd just get that. It's just as good. Just make sure it's the version that's on the 229.51 or 229.52 list so you don't harm the particulate filter.
Mobil 1 and competitors are mostly Group III base stock now, which is one reason why the price has come down. At some point in the early 2000s, they started calling mostly Group III oils "full synthetic". That used to be reserved for Group IV and Group V oils. The M1 0W-40 was the last one to be almost entirely Group IV, which I am sure contributes to its performance and why it was the factory fill for new Porsche 911s and the Nissan GT-R. That's just one factor, and I'm sure the new oils are at least as good on the whole.
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