| Author | Message | ||
     Blake |
http://www.machinerylubrication.com/Read/29026/eng ine-bypass-filtration 40 micron is typical filtration? I thought we were down to the 10 to 20 micron capability. | ||
| Hughlysses |
Yea, I'm kind of surprised it's no better than that. Commercial 40 micron permanent metal filter elements have been available for a long time; I'd have thought paper was a lot better than that. It's interesting that bypass filtration was developed and used long before full-flow filtration. Older cars had NO filtration (up into the 50's) and a bypass filter could be added as an option. I wonder how a bypass-only filtration system performed compared to a modern full-flow filtration system. | ||
| Sifo |
It's a matter of how effective a filter is at a certain micron size. Modern filters will tend to be very effective at 40 microns. Only partially effective at 10 or 20 microns. See the beta ratio test in the original link. So how effective is a filter that only catches 10% of particles at 10 microns? I could also ask how effective is a bypass system that filter 100% of particles at 10 microns, but only filters 10% of the oil. It would seem like the same thing to me. Of course there's more details in each system that give each system it's own pros and cons. | ||
| Dwardo |
I just quickly read the article and it seems to be referencing an additional oil filter to catch that bypass oil that is rerouted when the main filter becomes overwhelmed. That is different from the bypass oil filter found on really old cars like my Hudsons. These only operate when the pressure relief spring in the oil pump lets oil through the relief valve. So, the oil that gets filtered is sometimes and not very much. In my opinion, these are just about worthless. On the Hudson, this filter does a great job of blocking access to the timing marks, which are inconveniently located on the flywheel. For my Hudson hot rod engine (yet to be started) I engineered an oil passage into the oil pump that will force all the oil through a pair of FL1 filters before entering the engine. | ||
| Hughlysses |
Edward- are you saying I'm not the only Hudson owner here? (53 HHCC) | ||
| Dwardo |
Apparently you are not - Club Coupe? Lucky! I have a 53 Hornet Sedan that runs well but is not as good as it looks and a 54 Super Wasp Sedan that was becoming a hot rod until the MGB project got in the way. | ||
| Reepicheep |
I think what it is saying that instead of doing a bad job of filtering all the oil every time it goes round the engine, you should do a really good job of filtering just some of the oil every time it goes round the engine. Which kinda makes sense to me, especially if there was some kind of screen in the system to address catastrophic failures. | ||
| Hughlysses |
Edward- yea, it's a club coupe. I got about 75% through a restoration (full mechanical, 50% interior, 50% cosmetic) and then let the car sit up more and more over the last 20 years as I raised a family until now I need to start over. | ||
| Dwardo |
It happens. My uncle restored a '47 pickup and then blew first gear dragging a slab of concrete around the yard to flatten it. Then he just let it sit, so now it's worthless. I can't figure him out sometimes. Do you need any parts? | ||
| Hughlysses |
Edward- It'll probably be a couple of years before I can do anything with it; I'm sort of waiting on retirement before I try to do anything with it. |
