2 stroke oil in fuel for economy boost?

[Piotrsko]

Originally Posted by cRiPpLe_rOoStEr

Older Diesel engines used to rely a lot on the reaction of the sulphur content of the fuel with the nickel content of some alloys used in the manufacturing of the pumps and injectors. On a sidenote, as biodiesel is often pointed out as a lube too, maybe it would be interesting to try Castor-based 2-stroke oil often used in racing karts, which may blend well not only to regular Diesel but also to some higher content of biodiesel.

The consensus preferred is a 1 dollar bottle of walmart 2stroke oil per tank of any fuel in my navistar engined F250, but I think that is a price consideration. Castor oil mixes but doesn't burn (at least in rotary radial engines, hence the scarves favored by the pilots) so it might affect the catalytic converter

[cRiPpLe_rOoStEr]

Originally Posted by Piotrsko

Castor oil mixes but doesn't burn (at least in rotary radial engines, hence the scarves favored by the pilots) so it might affect the catalytic converter

Are you sure it doesn't burn? At least the ones meant for kart-racing used to be prefered by DKW-Vemag car owners, as its more accurate mix to the gasoline in Brazil due to its high ethanol content leads to a more complete burn. Maybe in a Diesel engine it's a whole different issue, even though it might work better with biodiesel due to the alcohol which replaces the glycerin.

[Piotrsko]

If you ever were in the exhaust stream of one of those radials, you would be sure it didn't burn after you finished in the bathroom.... I DON'T know about it in karts, I do know all my 2 stroke toy airplane engines spit oily goo everywhere and the same result running it in yard equipment mixed with gasoline. The new synthetic castor oils I haven't tried since the CFO thinks my hobbies are a tremendous waste of her money

[Vwbeamer]

I run a ratio of 640- 1 TWC to 87 unleaded (one ounce per 5 gallons) in my wife's Toyota Sienna to lube the direct injection High pressure fuel pump.

There is some evidence that the higher ratios keep the valves and combustion chamber clean.

At worse, I think it's a waste of time and money, at best it will make the fuel pump, rings and valves last longer.

Any increase in MPG is very small, I've done tanks back to back with and without. Sometime the without wins, sometimes the with wins.

Those that predict fouled plugs, smoke, carbon cumbustion chambers are simply wrong if the oil is used at these extremly high ratios of over 200-1.

[oil pan 4]

Originally Posted by Tahoe_Hybrid

catalytic converter poisoning

With what?
2 stroke oils have no anti-wear additives and little to no detergent.

[Piotrsko]

Originally Posted by oil pan 4

With what?
2 stroke oils have no anti-wear additives and little to no detergent.

They are also ashless dispersant so there's nothing to plug a cat with.

Over on the ford truck forum, they have been running 2 stroke oil since 2003 in the diesels with dpf and cats, no issues.

[rmay635703]

MMO and 2 stroke oil may help rings to seal better in a worn or defective engine (like any top end lube)

[Vwbeamer]

One other benifit on direct injection engines, where the fuel is directly injected into the cylinder it can wash the lube off the cylinder walls, it might be helpful to have some oil in that fuel for max engine life (200K plus).

[oil pan 4]

I believe the latest 2 stroke oil standard is essentially ash free.

[cRiPpLe_rOoStEr]

Originally Posted by oil pan 4

I believe the latest 2 stroke oil standard is essentially ash free.

Synthetic? Those which won't cause that visible blue smoke might be ash-free. Recently I spotted a 2001 Aprilia SR50 LC in my neighborhood, and it didn't left any visible smoke, ran basically as clean as a comparable 4-stroke of its vintage would.