OVERKILL
$100 Site Donor 2021
Originally Posted By: Ducked
Originally Posted By: ReverendC
When I start my seldom used 1990 Chevy truck, I hate that 3 seconds of engine rattle knowing that lots of metal things aren't getting any oil.
If the paper I found is still current, the BPT (Borderline Pumping Temperature) is defined after a minute of cranking. Listening to that for a full minute would hurt.
I'd like to believe that this is a binary go/no go phenomenon, (oil pumps or it doesn't) and maybe it is, but its a bit of a stretch. The fact that it seems to be defined as a cutoff isn't very persuasive on its own, since that might just be for procedural convenience.
I believe we might have read the same publication and if that's the case what I found concerning was that the pumpability point for certain engines was different than with others. IE, one engine would pump a 60,000cP lube, but another wouldn't pump one that was 35,000cP. The limit used to be 30,000cP based on that same publication. It was found newer engines were able to pump the 60K cP lube but where does that leave the older engine crowd?
Originally Posted By: ReverendC
When I start my seldom used 1990 Chevy truck, I hate that 3 seconds of engine rattle knowing that lots of metal things aren't getting any oil.
If the paper I found is still current, the BPT (Borderline Pumping Temperature) is defined after a minute of cranking. Listening to that for a full minute would hurt.
I'd like to believe that this is a binary go/no go phenomenon, (oil pumps or it doesn't) and maybe it is, but its a bit of a stretch. The fact that it seems to be defined as a cutoff isn't very persuasive on its own, since that might just be for procedural convenience.
I believe we might have read the same publication and if that's the case what I found concerning was that the pumpability point for certain engines was different than with others. IE, one engine would pump a 60,000cP lube, but another wouldn't pump one that was 35,000cP. The limit used to be 30,000cP based on that same publication. It was found newer engines were able to pump the 60K cP lube but where does that leave the older engine crowd?