[F14CRAZY]

3800? 141k? high mileage?

[Richard D]

Originally Posted by F14CRAZY

3800? 141k? high mileage?

GOOD POINT! I was thinking of engines from the 1960's and early 70's that were considered used up if they made 100,000 miles.

[Richard D]

Originally Posted by kennyw

If anyone took the time to read my oil link they would find DINO oil can now be refined so well it can be called synthetic. MOBIL lost a court case on that one. You will find that you know very little about oils of any kind. It is an eye opener...........ken

Hello Ken, As a matter of fact I did read your link and that is one of the reasons I decided to keep things the way they are and not listen to the marketing hype. If I had seals leaking or some other problem I would consider it.
Once again Thank You All,
Richard.

[kennyw]

Yes: who would have [thunk] motor oil is mainly mineral oil to start with? It is a long read and at the end you know less than when you started. It sure debunks the, if it is an old motor use single weight oil as that is what it was designed for. Here I am talking motors made from 1950 or so back. I have so many friends who will not use modern oils in antique motorcycles. Basically the article says the old oils were junk. That was the reason you were doing motor rebuilds from the 40,000 mile mark. ken

[padgett]

Well, part of the reason. Better metallurgy (what sunk the Titanic) and being able to hold much tighter tolerances is more and you can toss in oil filters (optional in the '50s) and the 3800s roller lifters and georotor (much better than a gear pump) oil pump rounds it out.

[CHAS1]

Optional Oil Filters. Boy I remember that. Optional heaters as well!
100K on my slany 6 Mopar and it was a oil burner back in the 60's
Things change.

[Richard D]

Do any motorcycles still use centrifugal oil "filters"? Back when I was 14 I was attempting to put a Honda 305 engine on a 160 frame and for some reason I pulled one of the engine side covers and saw a cup that I did not know what it was. I figured it out, oil comes in the bottom and the cup spins at some high RPM and the trash in the oil gets plastered against the sides, so hard that it becomes part of the cup, was almost impossible to scrape any out with a pointy tool. (screwdriver)

[Ronnie]

Originally Posted by Richard D

Do any motorcycles still use centrifugal oil "filters"? Back when I was 14 I was attempting to put a Honda 305 engine on a 160 frame and for some reason I pulled one of the engine side covers and saw a cup that I did not know what it was. I figured it out, oil comes in the bottom and the cup spins at some high RPM and the trash in the oil gets plastered against the sides, so hard that it becomes part of the cup, was almost impossible to scrape any out with a pointy tool. (screwdriver)

Some of the Fiat cars (124 Spyder) used a similar system except the centrifuge was built into the harmonic balancer. It could be cleaned by removing a row of bolts that allowed an access cover to be removed.

[Richard D]

Hi Ronnie, Very clever idea before they came up with the spin on oil filter. Thank's for the info.

[padgett]

FIAT 124 particularly. Saw quite a few that had oil pressure issues caused by gunk in the slinger. Few were caught soon enough to avoid problems. I had a '68 Spyder bought cheap with 100k and low oil pressure. Cleaned the slinger and went another 80k before selling it still running strong. One of the cars I miss though suppose a Miatta is a better car.

The 150 cc 1986 Honda "Spacy" I just bought has a slinger.