tig1 said:Well not according to this video which has been shown several times. This is the extreme side of cold and vis, but the point is thinner oils flow to the top end quicker than thicker oils. Engine test starts about the 5 min mark.
https://www.youtube.com/watch?v=OWiQyR7PWII
Ahhh, the old tig1 wheelout of oils at and beyond the limits of pumpability...how many times ???
Why do you keep wheeling THIS out ???
It simply shows the time lag with oil flow to the upper end of an engine, at least for me. Again this demo is at the extrems of oil wt and temp. I get that, but I have experienced this myself in my own engines many years ago in -20F temps using 10-40 oils. Thanks for asking.
Gerald
tig1 said:Well not according to this video which has been shown several times. This is the extreme side of cold and vis, but the point is thinner oils flow to the top end quicker than thicker oils. Engine test starts about the 5 min mark.
https://www.youtube.com/watch?v=OWiQyR7PWII
Ahhh, the old tig1 wheelout of oils at and beyond the limits of pumpability...how many times ???
Why do you keep wheeling THIS out ???
It simply shows the time lag with oil flow to the upper end of an engine, at least for me. Again this demo is at the extrems of oil wt and temp. I get that, but I have experienced this myself in my own engines many years ago in -20F temps using 10-40 oils. Thanks for asking.
Gerald
Yeah, but the quoted video was about starting and racing engines under various conditions, NOT about starting an engine 30F below it's rated temperature range.
Wasn't it ?
tig1 said:s. This is the extreme side of cold and vis, but the point is thinner oils flow to the top end quicker than thicker oils. Engine test starts about the 5 min mark.
Note that SilverFusion2010 pointed used the qualifier, "[a]s long as the oil is pumpable...." In the video in question, one of the oils was not pumpable.
Note the video I provided compared 0-30 synthetic to 10-30 dino(lots of wax in the oil) and was pumpable at 6:40-7:00 or so. Normally folks claim 10-30 dino flows(pumpable) great even at very cold temps. Not sure what you mean one of the oils was not pumpable? [/quote
tig1, we talk about oil flow at 0C, you wheel out the video for -40C, and claim it proves superior flow. We talk about stating in the desert, you wheel out the -40C video and claim it proves 0W has superior flow.
When we point out that wasnt' the topic of dicsussion, and at "pumpable" ranges, there's ZERO difference, you say "just look at the video, there's all the proof that you need".
Here's J300, it gives you an indication of what oils you would need when starting your race engine (the OP's video) at different temperatures...i.e at what temperatures the oil is expected to be "pumpable" and make it's way through the engine.
If YOUR local racetrack is -40C...then of course 0W flows better.
If your local racetrack doesn't go below 0C, then anything is pumpable.