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2 Stroke Oil ...in a 4 Stroke?

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fogrider:
I have a Norton rotary which is a 4 stroke but the lubrication of the entire engine internals is by pre-mix  oil.  (via a Yamaha auto-lube ).  I can't  remember exactly what the ratio is but 1/300 rings a bell . I will look it up. That means in an engine with pressure fed lubrication will need way less than that. The original was Shell Rotella DD40 which is a straight 40 diesel engine oil and made them smoke  and, in mine, I found a big build up of ash in the exhaust ports.    Classic 2T is now preferred by some but it's damn expensive, no smoke though and if you use a synthetic you get that lovely perfume smell !  I believe Wiz racing used Classic 2T in their race bikes at the classic TT.

In the old days, when I filled up the attendant would ask if I  wanted a shot or two of Redex. One or two shots per gallon . That is quite minimal in proportion.  2 old pence a shot I seem to remember. How could I afford that !

SumpMagnet:
can't see it doing any harm. The stuff is intended to burn in a combustion chamber, and at small doses, it's not going to foul plugs or cause carbon issues. I run some large scale RC cars that use premix fuel, and wioth good quality synthetic oil, there is virtually no soot build up at ratios of 25:1...and thats in what is basically a 30cc chainsaw motor. Get run pretty hard too

McCabe-Thiele (Ted):
Before Cats & DPF's I always used some 2T oil in my bikes,petrol & Diesel Cars - not every fill up but every 4 or 5 refills. I put in 1 Litre of 2T oil for a 142 litre fill up.

2T oil has an almost identical profile to Redex Oil but is usually much cheaper. This information came from my friend who used to be the chief engineer at Lubrizol in the UK who do independent vehicle testing for major oil companies. Using synthetic 2T oil is marginally better as its ultra low ash but the price means I use the cheapest 2T oil I can buy.

The 2T oil raises the burn temperature of the combustion products helping to reduce the build up of carbon particularly around the exhuast valves. It has a number of spin off benefits - often raises compression and can reduce engine noise. Be aware that using it too often or adding too much can lead to plug misfires etc reversing the benefits. We used to go to France 2 or 3 times a year so I always treated the tank for these nice long runs - it usually increased the fuel economy by a couple of mpg in the short term.

As an aside back in the 1960's I owned an old Vauxhall Victor F type saloon - the vehicle had been fitted with a Redex button operated device that was basically a small Redex container mounted under the bonnet connected to the engine inlet manifold vacuum connector. The pipe between the two was routed into the dashboard that had a small circular dial with a button that you pressed when the dial showed enough vacuum in the coloured zone. This button was depressed for a few seconds whereupon the exhuast would look as if you had blown the engine with blue smoke cloud following you lasting for 15-20 seconds! Can't remember what name it was marketed under something daft like a Redex Optimiser it had a sort of Red & Green Pie Face that rotated to show vacuum!

You were probably supposed to use it when stationary and reving the engine but it was very James Bond when your rear view mirror was a cloud of smoke behind you.

fogrider:
A Redex injector, that's brilliant Ted, don't remember them though .

I seem to think old 2 stroke bikes ran 1/30  although many riders ran 1/50 to stop plugs whiskering.

Back to the Norton,  1 pt of oil to 300 miles up to 1pt to 500 miles. Rotaries do from 35 to 45 mpg.

I think that equates to 1.5 % average and does the entire lube system.

A Redex 'shot' is 13cc which calculates as  0.0028 % of a gallon.   (do check my maths !)

ka-ja:
The old two stroke Ariel Arrow ran at 20 to one, 25 to one was considered a bit lean until the Japanese came along.

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