BBQ Tick Solved?

[Jetnoise]

Until you can determine the noise source everyone is just guessing.... and from what's posted on 6g everyone has been guessing.
There are multiple systems in the coyote that require not just lubrication but also pressure to perform a mechanical function.
How do you fix what you don't know what to fix? And if there is anything needing fixing at all?
Some cars seem to have a noise some don't
Maybe it's a staking of tolerances in a very complicated machine

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[Jetnoise]

Journal bearings actually have more hydrodynamic oil film thickness in them at higher RPM. Lugging the engine really bad at low RPM can actually be worse for rod bearings. But it is possible that the 5W-20 thins out too much if the oil temperatures get well above normal oil temps of ~200F. It certainly would not hurt to at least run a 5W-30.

.
how does journal bearings clearance spec change with change in rpm? Or oil get thicker?

 

[Jetnoise]

Nonsense.That is not from the can being made.

I had used and dumped oil out of mine about 4-5 times before metal showed up.. There is no metal particles or shavings in these cans.

Honest questions... your can and other mfrs can differ. Ever run a demon carb?

 

[GT Pony]

How does journal bearings clearance spec change with change in rpm? Or oil get thicker?

The journal shaft tries to center itself more in the bearing due to RPM because the hydrodynamic wedge becomes larger with higher RPM. You can also see that a thicker oil also provides a larger "Minimum Oil Film Thickness" (MOFT), which is the small film of oil that prevents the journal shaft from contacting the bearing surface during operation.

Two RPM cases are shown in the Tables below - 2500 RPM and 7500 RPM. MOFT is greater at 7500 RPM than at 2500 RPM for all viscosities shown. And the higher viscosity oil also gives greater MOFT at the same RPM.

 

[Jetnoise]

Cool Graf
But what does it all mean Basil?

 

[Jetnoise]

Flow rate is dependent on a few things. Flow rate does not increase or alter the the bearing clearance

 

[GT Pony]

Cool Graf
But what does it all mean Basil?

It means thicker oil and higher RPM gives more oil film thickness between the journal shaft and the bearing. Lugging an engine at WOT and low RPM with very thin oil is bad for journal bearings. And higher RPM with a thicker oil will protect bearings better ... unless the oil gets way too hot and thins down way too much. It's all a balance.

 

[GT Pony]

Flow rate is dependent on a few things. Flow rate does not increase or alter the the bearing clearance

No, it doesn't "alter the physical bearing clearance" ... but it does change the thickness of the protective hydrodynamic oil film which is the only thing protecting the bearing from self destruction.

The oil flow through a journal bearing (known as the "side leakage") certainly is dependent on the bearing's rotational speed. That's basic journal bearing physics. Google up journal bearing side leakage. The other factor is oil supply pressure at the bearing ... both factors are what contribute to the total side leakage oil flow rate through the bearing.

 

[Jetnoise]

And why some who have had success with "thicker" oil and tick alleviation
I'm not trying to have a game of wits with you. I just don't see how "film thickness" increases The size of a journal bearing at high rpm.

The chart shows 7500 rpm
Some with a tick have never rev'd over 3500 and have the tick. So beat the thing hard from the word go? Some would say so some don't .... who knows?

 

[Condor1970]

And why some who have had success with "thicker" oil and tick alleviation
I'm not trying to have a game of wits with you. I just don't see how "film thickness" increases The size of a journal bearing at high rpm.

The chart shows 7500 rpm
Some with a tick have never rev'd over 3500 and have the tick. So beat the thing hard from the word go? Some would say so some don't .... who knows?

Well, I will say that when I went out and ran it at 3,500rpm in 3rd gear down the highway for about 10 minutes, I got home, and the tick was gone, but came back the next day, though sounding a little less. Weird.

I may just go out to the local track sometime, and run it hard for a while, then switch to 5w30, and some Ceratec. LOL

Of course that depends on when they get my new clutch installed.

 

[OneFordGT]

Same sound in all of these examples I quickly found. This is the BBQ Tick everyone is talking about. What are your thoughts?

 

[Jetnoise]

“when I went out and ran it at 3,500rpm in 3rd gear down the highway for about 10 minutes,”
Was this an experiment?
Just curious
3500 on the highway was normal in my last car, hurt to do it. Thank gawd for overdrive

 

[Condor1970]

“when I went out and ran it at 3,500rpm in 3rd gear down the highway for about 10 minutes,”
Was this an experiment?
Just curious
3500 on the highway was normal in my last car, hurt to do it. Thank gawd for overdrive

Yes, it was an experiment. There's the old theory that we tend to really baby these cars which weren't built for Grandmas. So, I took it out and ran it up for a bit just to see how it would behave afterward. 3,500rpm for 10 minutes in 3rd is not going to hurt it, so it was interesting to see. Normally on my daily drive, I cruise to work on the highway in 6th gear at 1,800rpm going about 65-70mph.

 

[Jetnoise]

Same sound in all of these examples I quickly found. This is the BBQ Tick everyone is talking about. What are your thoughts?

All of them Sound like a gas powered Benz I had ...minus the obvious diesel sounds....
It’s tick wasn’t piston slap or bearings or “thrown” rods or anything related to the reciprocating assembly.
I’d say your examples illustrate a tick can come from a variety of things for a variety of mechanical reasons.

Doubt it could be what my Benz issue was....the only thing in common is a mile long timing chain....hmmm
That’s a different topic thread

 

[Jetnoise]

Yes, it was an experiment. There's the old theory that we tend to really baby these cars which weren't built for Grandmas. So, I took it out and ran it up for a bit just to see how it would behave afterward. 3,500rpm for 10 minutes in 3rd is not going to hurt it, so it was interesting to see. Normally on my daily drive, I cruise to work on the highway in 6th gear at 1,800rpm going about 65-70mph.

Plenty of GILfS driving 5.0’ where I live so don’t be to unkind
Make a good used car to buy as well...so they say.
Lead feet aren’t gender specific though...

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