Mattax is right on about this. There's still a difference, and it can be important.
But more importantly, it doesn't matter in this case
@Dave NEO 's engine is pushing 30 psi even when hot. His engine shouldn't be making any noise because of that pressure, it's high enough.
So the problem likely isn't which oil he's running or what viscosity it is, he should be looking for what/why it's making noise. Maybe the top end of the engine isn't oiling properly, or the valvetrain is out of spec, or the lifters are going bad, or the cam is going flat, etc.
that don`t fly w/ my engine, lighter oil, less pressure--------Do you have a well pump on your house?
Imagine if it was pumping something thicker than water.
Molasses is good because its extreme, but honey, or ketchup is Ok if that's easier for you to picture.
Now go open a faucet on an upper floor.
How much would flow out compared to water?
What would the pressure be at the pump?
How 'bout at the faucet?
Repeat the above scenario except open all of the facuets on the first floor as well as the upper floors.
Then take these analogies back to the engine and make it less extreme.
Its an analogy to point out the relationship of pressure and flow. Its not an explanation of the Goldilocks for any particular enginethat don`t fly w/ my engine, lighter oil, less pressure--------
Its an analogy to point out the relationship of pressure and flow. Its not an explanation of the Goldilocks for any particular engine
When stuff is flowing it matters where pressure is measured.
How much flows depend on both pressure and viscosity.
The goldilocks for any particular engine will depend on the clearences and temperature.
On the dairy end of the farm we had a 160ft well of hard water, I know a little about wells, no wells now tho.Do you have a well pump on your house?
Imagine if it was pumping something thicker than water.
Molasses is good because its extreme, but honey, or ketchup is Ok if that's easier for you to picture.
Now go open a faucet on an upper floor.
How much would flow out compared to water?
What would the pressure be at the pump?
How 'bout at the faucet?
Repeat the above scenario except open all of the facuets on the first floor as well as the upper floors.
Then take these analogies back to the engine and make it less extreme.
so say I switch to 15W50 - what might I see if maybe it's too high a weight?
Save some money go with T4 15w40
https://www.walmart.com/ip/Shell-Rotella-T4-15W-40-Heavy-Duty-Diesel-Oil-1-gallon/181236405
years ago i had a 390 in a 66 fairlane, always used 20/50 as it was pretty 'loose'. i needed an emergency top up during a long run once and used 10/40 (all i could get) to get me home. that thing was noisier than hell. i changed it back to 20/50 the next day and it was all quiet as before. i know it was a ford but you guys are talking ketchup and molasses so.........
anyway maybe try the 15/50 as suggested.
neil.
If you look at any "good old" Chilton manual, you'll see that Ford's bearing clearances back then were looser than most everybody else's. I don't know what the purpose for that was, but it's true.
what, are you selling an old rear end?Might need to add some sawdust to that mixture...
If you look at any "good old" Chilton manual, you'll see that Ford's bearing clearances back then were looser than most everybody else's. I don't know what the purpose for that was, but it's true.