I've never pulled apart a dry engine

[Shannow]

Have said it many times that I've never pulled apart an engine wihtout getting covered in oil.

Pulled piston assemblies out of a BMW 6 (well 5, as one was out the side), that had been sitting in a shed for 2 years, and the piston assemblies still held a LOT of messy oil.

Stumbled across this yesterday.

http://www.phillips66lubricants.com/industries/aviation/faq.aspx

Quote:
I've heard that single grade aviation oils "adhere" better to engine parts. What's the truth about oil retention in my aviation piston engine?
A persistent perception in the aviation community is that monograde, or straight-grade, aviation piston engine oils adhere to engine parts better than their multigrade counterparts, thus providing better protection during periods of inactivity. While it may sound intuitive that a thicker straight-grade oil would remain on engine components longer than a multigrade oil, the simple fact is that all aviation engine oils drain off the parts down to a residual oil film thickness of three to four microns after just a few hours, regardless of the brand or viscosity of the tested oil. The idea that single grade oils adhere better is a myth.

So (whatever the test was), there was a rapid drain off, but still retention after 48 hours, comparable to 24.

Is a "dry" start still wet ?

How does stop start gell with this (at least in the piston world) ?

 

[demarpaint]

Originally Posted By: Shannow


How does stop start gell with this (at least in the piston world) ?


Great question. In my world it would be something I'd want to disable ASAP.

 

[UNC017]

Start/stop is NEVER going to cause lubrication-related problems because the engine isn't off long enough for any appreciable drain-back. What it will cause is a)short starter motor life and b) driver irritation (if the driver is me, anyway...)

 

[demarpaint]

Originally Posted By: 440Magnum
Start/stop is NEVER going to cause lubrication-related problems because the engine isn't off long enough for any appreciable drain-back. What it will cause is a)short starter motor life and b) driver irritation (if the driver is me, anyway...)



Those are the exact reasons why I'd want to disable it. I'll pay the extra few dollars a week for the gas. The lube running off the engine parts is not a major concern to me, it's everything else about it.

 

[MrQuackers]

I'm sure that the run/stop vehicles do not have run of the mill starters. It will probably be standard within 5-10 years.

 

[A_Harman]

Originally Posted By: MrQuackers
I'm sure that the run/stop vehicles do not have run of the mill starters. It will probably be standard within 5-10 years.


You could be right about that.

 

[splinter]

FWIW my drain pans always seem to have a noticeable coating of oil still on 'em...after having drained for months between use.

 

[camrydriver111]

Originally Posted By: MrQuackers
I'm sure that the run/stop vehicles do not have run of the mill starters. It will probably be standard within 5-10 years.


They are pretty common in Europe now. Even on cheaper econoboxes.

 

[mulehead]

Having a car not running at a light to save gas is a safety issue.

 

[demarpaint]

Originally Posted By: A_Harman
Originally Posted By: MrQuackers
I'm sure that the run/stop vehicles do not have run of the mill starters. It will probably be standard within 5-10 years.


You could be right about that.


Probably.

 

[fdcg27]

I have no doubt that you've opened up more engines than I have, but you make an excellent point.
The oil clings to all surfaces. It never completely runs off.
An engine is an oil environment. It doesn't dry up internally over any interval short of a number of decades.

 

[OVERKILL]

Originally Posted By: fdcg27
I have no doubt that you've opened up more engines than I have, but you make an excellent point.
The oil clings to all surfaces. It never completely runs off.
An engine is an oil environment. It doesn't dry up internally over any interval short of a number of decades.


My experience exactly. I can go out to my garage and pull the valve cover off my old 302 and it is still an oily experience under there even though it hasn't run in probably 5 years now.

 

[Oil Changer]

I guess that I will not find a bottle of Magnatec in Shannow's garage.

 

[Shannow]

Originally Posted By: Oil Changer
I guess that I will not find a bottle of Magnatec in Shannow's garage.


Look at my sig...

 

[mcrn]

I test drove an F150 with the 2.7 and it had the auto start off feature....it would not turn off if the wheel was turned and if it was off it would come back on with the touch of any control....even the radio.

 

[Oil Changer]

Ha! I stand corrected.

Originally Posted By: Shannow
Originally Posted By: Oil Changer
I guess that I will not find a bottle of Magnatec in Shannow's garage.


Look at my sig...

 

[CT8]

Where does all the dry start regurgitations come from??? Good marketing to uninformed gullible consumers?

 

[Shannow]

Years ago, I was at a promotional dinner, and spent the evening talking to a (now ex) Castrol chemist who worked on the development of the Magnatec.

His take was that engines start, there's a film there already, the oil is cold (and therefore thick), and does a pretty decent job of protecting initially...

Then as it heats, it thins, and in addition, there's a period when everything's not properly expanded and clearanced, and the additives haven't kicked in...the wear is during warm-up phase, not the "start" per se.

Sequence IVA duplicates that phase...the engine is running, it's oiled, but the temperatures are held at a point that the additives aren't functional.

Yep, as a result of that evening, I DO use magnatec when it suits my purposes.

 

[mjoekingz28]

Shannow, how in the world do you have a sig on page one, but not p.2?

 

[mjoekingz28]

Oh nvm, i see the add sig button.....just happened to see it for the first time after posting, oh.