Posted on Wednesday, September 28, 2011 - 01:15 pm:
yes you're right they do however i'm not willing to risk it. esp if the rear main is what starts dribbling due to it being cleaned. really don't have time or interest in fixing that.
Posted on Wednesday, September 28, 2011 - 02:53 pm:
Hugh, I've never seen an automotive or motorcycle oil filter system that didn't include a bypass circuit. I think it's pretty much required in case of filter clogging.
Blake- We're apparently talking about different things. Yes, full-flow oil filters always have a bypass built in that allows oil to bypass the filter element and go to the bearings if the filter is clogged or if the oil is too cold to flow through it.
In the engines I'm talking about with bypass oil filtration there was no full flow oil filter. Oil flowed from the pan, through the pump, and to the bearings with no filtration. The oil filter was an optional accessory that could be added by the dealer. Many engines never had these installed and therefore had NO oil filtration. In this oil filtration system, a small portion of the oil flow is tapped off downstream of the pump, but upstream of the bearings, and routes it through an oil filter and from the oil filter back to the oil pan. The oil "bypasses" the engine, hence the name.
If you see an oil filter housing on a pre-1956 (approximately) car, it's a bypass filter. Here's a photo of a bypass oil filter on a 1955 Chevy 265 V-8:
Note the very small oil lines which are sufficient for the small oil flow routed through the filter.
In the next few years, the manufacturers developed full-flow oil filters which were incorporated into the engine's oil system as opposed to being an add-on accessory. Except when the bypass on these filters opens, all the oil that leaves the pump goes through the filter before going to the rest of the engine.
Posted on Wednesday, September 28, 2011 - 04:08 pm:
I had a 2001 GMC Jimmy. I installed a submicronic filter that would filter approximately 10% of the flow rate on a continuous basis. The filter canister had a roll of TP as the filter medium. I ran 0W-30 German Castrol Synthetic for almost the life of the vehicle. I ran 28,000 mile change intervals and changed the submicronic filter every 7,000 miles. It would take approximately 0.5 quarts to top off the oil after the filter change.
I recently donated the truck to a veterans group with 281,000 miles. The engine burned virtually no oil and ran like a top when donated.
The oil became slightly discolored, but looked like almost new. I did a few oil analysis early on but the oil always passed. As the age of the car increased, I did not worry about doing analysis, I just maintained the same intervals.
The system worked great. I was going to install the same system on my current vehicle, but it a 100K warranty and I was afraid it would be a problem ( and lazy).
Posted on Thursday, September 29, 2011 - 11:01 am:
The engine in that second video looks great for close to a million miles! It would be nice to know what sort of service schedule he followed. That certainly relates to Mr. & Mrs. Minivan better than the Mack truck example.
Toilet paper filters! I had completely forgotten about those! I never had a car with one of those though. I did have a car with only a mesh screen though. It threw a rod on I96 in MI at about 1:00 AM one night.
Posted on Thursday, September 29, 2011 - 11:08 am:
Hugh is exactly right. My Hudsons have exactly the same oil filter as that Chevy. I consider them to be basically worthless except as a means to block the flywheel aperture so I can't see the timing marks. For the hot rod engine I'm building I have modified the oil pump housing in such a way that I can run all the oil through a spin-on filter before it enters the engine.
Edward- you own Hudsons?(!!) My knowledge of such filtration systems also comes from Hudsons- my 1953 Hudson Hornet Club Coupe!
When I get around to re-restoring it in the next few years, I'd love to do a full-flow oil filtration system as you suggest. Info/pics would be greatly appreciated.
In the 50's Smokey Yunick built Hudson engines for stock car racing...his engines dominated...after one race, there was a protest...when the engine was torn down, it failed because the tech guys determined that the head had been ported...
Ole Smokey pulled out the rule book and pointed out that the rules clearly said you could not use a cutter or grinder to modify the ports.
Smokey showed them that the ports had in fact not been cut or ground with a grinder....he had in fact invented the first prototype of a process that was later refined and named "Extrude Hone".
He had made plates and rigged a pump that pumped a slurry of abrasive thru the ports.
Harry- That's a cool story that I've heard before (note that the Hudsons were flatheads so technically it was the block that was extrude-honed). He was a master at figuring out what the rule book did not say you couldn't do, as opposed to figuring out what the rule book said you could do.
Hugh, you have a coupe???? I am SO jealous. Are you a member of the HET club? If not, please PM me. Smokey Yunick addressed our national meet back in 1999 (I think) and was MOST interesting. He has since passed on. I can send you pix of the oil pump mod but haven't tested it first. I do know that other people have done similar. I thought I had invented that idea and then all of the sudden, the same concept started popping up everywhere so I guess great minds think alike. BTW, I own a 53 Hornet Sedan and a 54 Super Wasp Sedan.
Edward- Yep, I have a coupe. I bought it back in ~1984, restored it about 95% mechanically and about 50% cosmetically over the next couple of years, drove it for about 10 years, then let it sit up for a few years and things went south. Now I basically need to start over again both mechanically and cosmetically. My engine was mildly hot rodded (Twin-H, headers, block reliefs, mild port job). I was a member of HET for many years but haven't been a member in 4 or 5 years.
BTW- I got to go to the "World Finals" at Bonneville last year and saw a guy break 220 MPH in a 308-powered streamliner! I went over and talked to them in their pits between runs. They were so surprised to see a fellow Hudsonite they gave me a free T-shirt.
