Originally Posted by
Cobrajet
In 2017, the 3A92 got roller rockers...anyone know if the noise is better or worse?
Of course I've never heard one make this noise besides mine. But because mine makes what I believe to be the exact described noise for the exact described time upon start up, I have to assume it is the same. Which would stand to reason that the noise is unrelated to the roller rockers.
On edit: I don't know the route of oil flow. But if I were to guess, I would have to guess that there needs to be pressure to push it through the filter. So, it would go from pump, to filter, and then get plumbed up to the top of the engine into the valvetrain area. The reason I mention this is that because I don't believe the oil up at the valvetrain is under much pressure. Just valve cover atmospheric pressure. High pressure from the pump to the filter, where it will see a large pressure drop on the other side of the filter. Then enough pressure to push it up to the valvetrain. Then it gets slung around.
Now these are just my "guesses." As I don't know the fact. But if these guesses are correct, oil pressure would not have a factor in the valvetrain. Of course there are exceptions. Seems like Honda did, and may still, use oil pressure to in some way to run the infamous VTEC. But after oil is slung around in the valvetrain, I don't think it is under pressure anymore. It just slings around until it can find a path back down to the oil pan, to start the whole process over again. Note: I'm admitting I may be wrong, I don't know the oil system at all. Just guessing how it works.
With that said, that is why on another thread my guesstimate was that the noise was related to the pump to oil filter area ... where the pressure changes from 0 to whatever upon start up.
7milesout
Last edited by 7milesout; 10-11-2021 at 08:56 PM.
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