Recent Topics
Mustang 4r70w atf recommendation
by Hansvoytek - 11/19/19 12:18 PM
PRO TEC PTL 57502 CUT OPEN
by 53' Stude - 11/19/19 12:08 PM
Federal rebates?
by buck91 - 11/19/19 12:07 PM
Bosch fuel pump quality
by drtyler - 11/19/19 11:28 AM
Standard Motor Products
by Whimsey - 11/19/19 11:25 AM
Delo SynBlend 15w40 - $11.45
by Greg L - 11/19/19 11:17 AM
VIRGIN STP 8316 CUT OPEN
by 53' Stude - 11/19/19 11:00 AM
FPPF: Polar Power & Total Power
by BigJohn - 11/19/19 10:40 AM
Quality filter for 2017 Subaru 2.5 Ltr
by Ishmael - 11/19/19 10:39 AM
Kendall GT-1 Max vs PP
by c5z06 - 11/19/19 10:25 AM
Toyota Sienna FWD in Snow / Ice
by tiredguy - 11/19/19 09:32 AM
7.62 x 39 Top Three?
by CCI - 11/19/19 09:30 AM
MOTUL Specific VW 508.00 Unboxing
by ARCOgraphite - 11/19/19 09:14 AM
A few Ford part number filters cut open
by mpgo4th - 11/19/19 09:08 AM
Battery warranty Issue at Pep Boys
by InhalingBullets - 11/19/19 08:35 AM
How Often To Use CRC IVC ?
by ChrisD46 - 11/19/19 03:28 AM
SEARS: 4 Stroke/Lawnmower Maintenance Deals
by GumbyJarvis - 11/19/19 02:17 AM
Pepboys Coupon
by Xeno - 11/19/19 02:12 AM
Pennzoil “Designed for Your Drive”
by LubeFiner - 11/19/19 02:09 AM
Ebay $15 of $75 purchase
by GMguy84 - 11/19/19 12:06 AM
Newest Members
Hansvoytek, DeltaP71, 300Kncounting, Bill67, vjt51965
69916 Registered Users
Who's Online Now
107 registered members (28oz, 69Torino, 77GrandPrix, 2010Civic, 53' Stude, 10 invisible), 1,960 guests, and 23 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics297,634
Posts5,119,684
Members69,916
Most Online3,589
Nov 2nd, 2019
Donate to BITOG
Print Thread
Hop To
Page 2 of 2 1 2
Re: PQIA most recent tests (5-1-2019)...no Noack results [Re: wemay] #5126984 06/06/19 11:43 AM
Joined: Mar 2017
Posts: 11,384
PimTac Offline
Offline
Joined: Mar 2017
Posts: 11,384
Wasn’t there a bit of discussion not too long ago about how Noack values were getting harder to estimate? Some of the large oil companies stopped publishing their estimates.


2017 Mazda CX5
Havoline Pro DS 0w20
Roki OEM filter.
Re: PQIA most recent tests (5-1-2019)...no Noack results [Re: PimTac] #5127019 06/06/19 12:18 PM
Joined: Jan 2006
Posts: 298
7
77GrandPrix Online Content
Online Content
7
Joined: Jan 2006
Posts: 298
Originally Posted by PimTac
Wasn’t there a bit of discussion not too long ago about how Noack values were getting harder to estimate? Some of the large oil companies stopped publishing their estimates.

You are correct. I believe that the discussion was about repeatability and reliability of the current test method.

Re: PQIA most recent tests (5-1-2019)...no Noack results [Re: PimTac] #5127087 06/06/19 01:27 PM
Joined: Jul 2017
Posts: 1,138
O
OilUzer Offline
Offline
O
Joined: Jul 2017
Posts: 1,138
Originally Posted by PimTac
Wasn’t there a bit of discussion not too long ago about how Noack values were getting harder to estimate? Some of the large oil companies stopped publishing their estimates.


Maybe keeping the sample at exactly 250°F and the "constant air flow" (kind of vague) is where it can cause some variations. also how big is the sample and what size & material container, where you measure the temp, test chamber environment and many other variables ...

Unless the test is fully defined and universal, the one line test from Wikipedia won't do it:
"In this test, a sample is heated at 250 °C for 60 minutes with a constant flow of air over it. The weight fraction lost is the result for the Noack volatility test."

It will be interesting to know the variation in test results with different interpretation and execution of the noack test when not fully defined.

Re: PQIA most recent tests (5-1-2019)...no Noack results [Re: OilUzer] #5127160 06/06/19 02:41 PM
Joined: Mar 2016
Posts: 2,429
C
CR94 Offline
Offline
C
Joined: Mar 2016
Posts: 2,429
Originally Posted by OilUzer
... It will be interesting to know the variation in test results with different interpretation and execution of the noack test when not fully defined.
Do you have knowledge that it's not clearly defined, or are you speculating that it might not be? There's not much point having such a test unless every relevant variable is clearly defined and described. I don't need to know all the details, but any lab performing the test certainly should.


2011 Toyota Prius now at 106K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: PQIA most recent tests (5-1-2019)...no Noack results [Re: 77GrandPrix] #5127198 06/06/19 03:27 PM
Joined: Mar 2017
Posts: 11,384
PimTac Offline
Offline
Joined: Mar 2017
Posts: 11,384
Originally Posted by 77GrandPrix
Originally Posted by PimTac
Wasn’t there a bit of discussion not too long ago about how Noack values were getting harder to estimate? Some of the large oil companies stopped publishing their estimates.

You are correct. I believe that the discussion was about repeatability and reliability of the current test method.





I think this is it right here.


2017 Mazda CX5
Havoline Pro DS 0w20
Roki OEM filter.
Re: PQIA most recent tests (5-1-2019)...no Noack results [Re: CR94] #5127502 06/06/19 11:00 PM
Joined: Jul 2017
Posts: 1,138
O
OilUzer Offline
Offline
O
Joined: Jul 2017
Posts: 1,138
Originally Posted by CR94
Originally Posted by OilUzer
... It will be interesting to know the variation in test results with different interpretation and execution of the noack test when not fully defined.
Do you have knowledge that it's not clearly defined, or are you speculating that it might not be? There's not much point having such a test unless every relevant variable is clearly defined and described. I don't need to know all the details, but any lab performing the test certainly should.


Based on what couple of posters have posted above such as "harder to estimate", and questioning "repeatability and reliability of the current test method" ... I said if the test and the test environment is not very specific and/or not fully defined, there will be some variation in the test result and companies can conduct the test differently.

i may look for the recent "discussion" about noack values being hard to estimate ... Curious to know how specific the test is.

Is the noack test defined/specified in api? I think the numbers are defined somewhere like less than %15, %12, etc. How about the test itself?

Page 2 of 2 1 2
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™