Two Stroke Oil API TC 100:1

[Stu55Flash]

I found this comment on a youtube vid for a Daimler SP250:

I have got a very good hint for you to keeping the nice old Engine in good shape with todays ultra dry eco fuels: Use 1:100 API TC two stroke oil / fuel mix as regular driving fuel, that keeps the old fuel-system gaskets, rubber parts, alloy parts etc... and cast iron metal surfaces of those vintage engines in excellent shape...and it also lubricates the valves and upper piston regions. Most Porsche vintage owners in Germany do so :) Also keeps carbs and tank clean and rustfree

Has anyone any experience of doing this in an A10/A7. Might give it a try?

Stu

[bsa-bill]

I suppose a shot of Redex would do the same, might be worth a try, although the vision of billowing spirals of  blue smoke behind an A just isn't right somehow

[Goldy]

Many years ago when petrol stations had attendent service the attendent would say " a couple of shots of Redex sir". It was considered necessary to have this "upper cylinder lubricant". I suppose it,s as relevant still today, perhaps even more so with the changes being made to the petrol.
Also reminds me of the price oof the petrol 4 shillings and 11  always sticks in my mind that about 25 pence today and of course thats per gallon not per litre.

[muskrat]

G'day all,
            I use Castrol R30 at 500:1 (2ml/Lt). No noticeable smoke and smells great.
Cheers

[Triton Thrasher]

It might save throttle slide wear.

But oil in the combustion chamber, on the upper cylinder wall and on the lower valve stems and valve heads is bad news, so who knows what percentage mixture would save the slide, but not play Hell with other parts?

[A10Boy]

Thats an interesting comment, why do you think it's bad news and would "play hell" with other parts? A mix of 100:1 is too little to coke it up and in my view would be a good thing. I often put a cap full of R40 in a 5 gallon jerry can of fuel along with the valvemaster and have had no problems.

[Triton Thrasher]

Thats an interesting comment, why do you think it's bad news and would "play hell" with other parts? A mix of 100:1 is too little to coke it up and in my view would be a good thing. I often put a cap full of R40 in a 5 gallon jerry can of fuel along with the valvemaster and have had no problems.

100:1, or some such weak mixture probably is harmless,  I'd guess,  but more oil makes the fuel more viscous, thereby slowing flow through the jets and weakening the fuel/air mixture.

Oil in the combustion chamber lowers the effective anti-knock rating of the fuel, so I'm, told.  It also builds up a cokey layer on the valves stems, which can hold a valve from closing.

Makers go to some trouble to design rings and valve stem arrangements to minimise the amount of oil in the combustion chamber. That's because the "upper cylinder" needs no more lubricant than is clinging to the bore and is reaching the valve stems from above.

[andy]

we in the family have always put a couple of squirts of oil out of the oil can into the petrol tank with no ill effects on a wide range of bikes(modern susukis,kawasakis, moto morinis ect ect) and it`s not to much to make it look like a 2stroke on full chat.