I wouldn't recommend that because there's a possibility of any excess tape outside the mated threads of getting swept into the engine.
it was a joke
Didn't read like a joke ... might want to indicate it better with an emoji or something, lol.
When threads are tight, what do think the equivalent flow path area through the length of the threads would be? It's not much at all, and the long length of the flow path is going to resist flow. What's your guesstimate of it?
Being tight is irrelevant. Tightening doesn't expand the nipple in the bore. It merely moves the thread faces to contact in one direction, opening up the helical gap on the other side. Looseness before tightening is reflective of thread clearance.
Yes, I know. You're talking about a "sprial leak path". Like I said, it's narrow and relatively long.
The numbers have been done for the leaf spring leak gaps ... thought you were in those discussions. Based on actual gap measurements, the leak could be as much as 15% of the total flow going through the filter. You were lost in the PD pump slip discussions, because you didn't really understand it fully and kept accusing me of things I never claimed. You keep thinking all health PD pumps are slipping like crazy, but that's not the case - they only slip ~15% max and the pump slip doesn't matter anyway because most start going into pressure relief at pretty low RPM (ie, they are over-sized). The pressure vs RPM graph roll-over is from pressure relief, not pump slip like you think. So I don't expect much understanding on this filter mount thread leak discussion either.
Did you get out a thread gauge or machinery’s handbook before coming up with those thread clearance dimensions? Or just a WAG? Flow calculator GIGO.Yes, I know. You're talking about a "sprial leak path". Like I said, it's narrow and relatively long.
The numbers have been done for the leaf spring leak gaps ... thought you were in those discussions. Based on actual gap measurements, the leak could be as much as 15% of the total flow going through the filter. You were lost in the PD pump slip discussions, because you didn't really understand it fully and kept accusing me of things I never claimed. You keep thinking all health PD pumps are slipping like crazy, but that's not the case - they only slip ~15% max and the pump slip doesn't matter anyway because most start going into pressure relief at pretty low RPM (ie, they are over-sized). The pressure vs RPM graph roll-over is from pressure relief, not pump slip like you think. So I don't expect much understanding on this filter mount thread leak discussion either.
I just so happened to run some numbers through the dP calculator tool for a narrow long flow path that a non-tapered threaded joint "spiral leak" would create. If the dP across the threads was 16 PSI, the leak rate through the spiral leak path would be around 0.02 oz/min (0.00015 GPM). If there is a 16 PSI dP across a typical oil filter, it's going to be flowing at least 8-10 GPM. So the leakage through the threads compared to the total flow through the filter would be around 0.00015/8 = 0.001875% of the total flow. Better get out the thread sealant.
You tell me what you think the spiral leak path is if you don't think that's a decent estimate. Even if it was 3 times what I estimated the leak is still super minuscule. How much do you think it's going to leak. You do the calculation if you think you can do better than the dP calculator I used. Prove it's not close to what I came up with, or stop the troll antics.
It’s enough that spin on fuel filters come with an o ring for this very purpose and tell you to use it. They have pretty small dp. So apparently it’s not minuscule or insignificant, even on “healthy” fuel fileters, whatever that means. .
Correct, our low pressure loops run up to 12 bar on most larger industrial diesel products. with a couple exceptions that will push 18 bar.
The viscosity of fuel at room temperature is way lower than oil at 200 deg F, so that makes it easier to flow through a super small leak path at any given dP. What's the spiral leak path configuration on a fuel filter - ie, thread size, thread clearance gap, number of threads? Also, once fuel goes through a fuel filter it never gets recirculated back through the system like oil does in an ICE oiling system. And the fuel goes goes through injectors which are more sensitive to contamination than what a super minuscule leak at an oil filter threaded spud would cause to an engine. If any leakage on the oil filter threads was something to worry about, all oil filters would come with an O-ring type seal on the thread interface.
Diesel fuel is around 4 cSt at RT. So roughly 1/2-1/3 of lube oil at operating temp, so not orders of magnitude different.
Regardless, the sensitivity of the fuel injectors is still there. That's not a concern with an ICE oiling system, especially when the possible leak is 0.002% of the total volume going through the filter. Even if it was a 0.01% leak it would be insignificant. Do you really think that's something to worry about? If so, you better get out the Teflon tape like you suggested earlier, or dig up some O-rings, lol.Diesel fuel is around 4 cSt at RT. So roughly 1/2-1/3 of lube oil at operating temp, so not orders of magnitude different.
Fuel filters I'm talking about are spin-on, not markedly different than a spin on OF. 1"-14 or 13/16" thread nipple. Look up a baldwin BF1212 for reference. You'll notice there's an o-ring in the product photo.
No, diesel systems recirculate back to the tank. That's how they cool the injectors and HP pump. So polishing could occur. Dirt gets buy and could harm the hardware, which is not unlike the postulated filter bypass path. "Negligable" and "irrelevant" seems like a subjective call.
Not really that relevant for the reasons already given. Hydraulic systems are also more sensitive to debris than an ICE oiling system.
Your initial argument was flow rate. Now it's sensitivity.
So what's your point. Any leak that is super minuscule to the total flow it's leaking into is insignificant in the case of an ICE oiling system. Would you be concerned if your oil filter was leaking 0.001% past the media (or the threads)? How about 10-15%.
