Mr Whippy
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| posted on 19/3/12 at 12:04 PM |
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Adding 2 stroke oil to the fuel for an old pre cat 4 stroke engine – Will it last longer??
What do you think? I have an old (1985) petrol landy, I was wondering if I should add a weak mix of 2 stroke oil say around 5-10%? to the petrol in
order to give better lubrication to the valves and piston rings. Not something I’d do to a modern car, the cat or lambda sensor in one would be
knackered in no time. But old landy has no such scary expensive technology and probably would not look too out of place trailing a big cloud of blue
smoke either 
It may need a decoke a bit more often but that’s no hardship as it's a doddle on these engines and I like to poke about inside now and again,
certainly a lot less hassle than the cylinder bores wearing. No worries about the performance suffering either as I already don’t have any...
Do you think doing this would extend the life of the engine? I think so. Would the engine run cooler from less friction? Not sure but probably.
But how much oil should I add, I don’t want too much smoke really, just enough to help
I have used redex for several years in the Bluebird but tbh apart from the carb venturi looking very clean have noticed zero improvements to anything
else and despite it's claims is really to thin too have any lubrication effects on the rings or valves
Tbh measuring the quantity of oil my be a case of dumping some oil down the filler before the petrol, though if I do it when filling right up from
almost empty to the top I should be able to ge an approximately correct mixture strength.
Anyone tried or does this to their old cars? Any 2 stroke oil you'd recommend? though may just try some scooter oil at first
Fame is when your old car is plastered all over the internet
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owelly
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| posted on 19/3/12 at 12:15 PM |
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It will make it smell nice but other than that, I doubt it will help the engine at all. Most of the oil will be burnt before it gets a chance to do
anything. In a 2 stroke, the oil does its oiling whilst in the crankcase and under the piston, not once its climbed up on top of it.
It could oil the valve stems but the original engine design will be taking care of that.
http://www.ppcmag.co.uk
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loggyboy
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| posted on 19/3/12 at 12:24 PM |
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Would probably just end up clogging the fuel filter long term.
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mark chandler
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| posted on 19/3/12 at 01:33 PM |
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It's supposed to make a difference with diesel cars, now they have yanked the sulpher out of the fuel the pumps etc are wearing out.
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MikeRJ
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| posted on 19/3/12 at 02:28 PM |
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It will accelerate plug fouling and carbon build up on valves and combustion chamber and will weaken the mixture and make it visibly smoke.
Completely daft thing to consider IMO.
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mookaloid
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| posted on 19/3/12 at 02:51 PM |
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quote:
Originally posted by MikeRJ
It will accelerate plug fouling and carbon build up on valves and combustion chamber and will weaken the mixture and make it visibly smoke.
Completely daft thing to consider IMO.
Agreed 
"That thing you're thinking - it wont be that."
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MikeCapon
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| posted on 19/3/12 at 04:09 PM |
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If you do decide to add a lubricant to the fuel it does not need to be that much. Competition 2 strokes run at 2% as their only source of
lubrification...
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ReMan
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| posted on 19/3/12 at 04:09 PM |
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Gotta be REDEX for an alternative fruitier flavour
www.plusnine.co.uk
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Peteff
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| posted on 19/3/12 at 04:28 PM |
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It's not going to achieve anything putting oil in the petrol as above, you'll just be spending money on oil that is doing nothing. You
need a lead replacement like Millers VSP which is also an octane booster.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Slimy38
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| posted on 19/3/12 at 04:28 PM |
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I thought in a standard engine you have oil coming up from below anyway, which will lube the cylinder walls where the piston rings rub? And the same
happens at the top of the engine, the part of the valve that is actually rubbing against something is oiled from above?
So the only thing that's not getting any oil is the very top of the cylinder and the valve seats, which are also the areas that burn hotter than
hell for a certain proportion of the time. And if the oil gets hot enough to burn, you no longer have nice slippy oil you have nice sticky sludge and
soot.
Personally I've given up on all fuel additives. Most modern fuels already have the equivalent of Redex in diluted form, it seems pointless to
then pay more and dilute it further. The only thing that worries me is the percentage of ethanol, but since I don't yet own a car that is
affected by it I'll do a bit more digging on that when it's appropriate.
Edit: Of course, the lead replacements are justifiable additions if your car ran better on 4 star.
[Edited on 19/3/12 by Slimy38]
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plentywahalla
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| posted on 19/3/12 at 07:23 PM |
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Modern 2 strokes run at 50:1. If your engine is 35 years old then you probably have nearly that much oil breaching your oil control rings anyway.
Rules are for the guidance of wise men ... and the obedience of fools. (anon)
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wombat
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| posted on 19/3/12 at 07:50 PM |
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I used to put my unused 2T race petrol in my Mk11 Escort, as we always used fresh for race weekend. Killed off 2 engines pretty quick, clogged
everything up. Bad idea.
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Mr Whippy
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| posted on 19/3/12 at 10:28 PM |
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ok good points there, won't bother
cheers
Fame is when your old car is plastered all over the internet
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