4 star petrol is being taken off the market in the U.K. there is a subsitute
to add to the fuel to cover this problem. do you have this problem in the
U.S.A. if so have you solved it ?. I have all so heard that due the emisions
problem the U.S.A. is about to phase out 2 stroke engines. is this true ?.
and if it is so were does this leave people with 2 stroke engines in good
working order. Mantis tillers e.t.c, thank tou for your help, and I hope
this is not off topic.
Richard M. Watkin.
I think they are phasing out the 2 stroke engines over here. I KNOW they
are for boat motors.
We use the same fuel for either type engine except that 2 stroke engines
require that oil be added in with the fuel. The only time I have seen it
pre mixed is at certain marinas where you can buy it pre mixed for your
I've never heard of 4 star petrol but I can only assume it is petrol
with the oil mixed in. If it's something else, I'd be interested to know
what it is. Not all 2 stroke engines require the same ratio of oil to
fuel. Pre mixed fuel would need to have enough for any engine and
therefore too much oil for some. That alone is a good reason to stop
selling it that way.
R M. Watkin wrote:
I agree with Steve. I have 3, 2 cycle motors. The mantis, chainsaw, and
weedwacker. They all take a different fuel to oil mixture. I buy 2
cycle oil from the store and mix my own at the appropriate mixtures for
each one and keep them in separate (and labeled) plastic gas containers.
4 star petrol is petrol which contained lead, which has been taken off the
market in favour of unleaded petrol. now from what I can find out, if you
run a normal 4 stroke engine on unleaded petrol it will burn the valve
guides out, unless the engine has been built to run on unleaded petrol. am I
right in assuming a 2 stroke engine has no valves ?.
now to the second point if they are phasing out 2 stroke engines for boats,
how long will it be before they phase them out for other things like tillers
e.t.c. and how long will it be before 2 stroke engines will become redundant
through lack of fuel and 2 stroke oil e.t.c. I am lead to believe this is
all because of the emisions problem and global warming e.t.c. hope this
makes more sense to you now.
Richard M. Watkin.
OK, that explains what 4 star means. Over here we got rid of lead in
our fuel years ago. At least 10 years, maybe 15. (gosh, maybe 20?)
There was quite a bit of concern when they phased it out. I was told by
one engine repair guy to just use one grade higher and there would be no
problem. I don't know what system they might use where you are but here
regular is 87 octane and the next grade up is usually 89. Actually, I
have some doubt that the guy knew what he was talking about. Some of my
lawn and garden equipment is old enough to be from the leaded fuel days.
I don't even bother with the higher octane now. I never had an engine
get into trouble with the new fuel and I don't know anyone who did.
As far as 2 stroke engines having valves... well they must. Isn't it the
valves that let in the fuel/air mixture and let the exhaust back out?
Steve (the first one) :-)
Yeah I've heard that one as well. They do have valves, they're just not the
same kind you have in a 4 stroke. They have reed valves which are one way
valves that open on the upstroke as pressure inside the cylinder is reduced.
the clasic (old) 2 stroke design did not have valves.
the new ones though do have valves to get improved performance
at the fuel burning process.
i do not thinnk that a two stroke engine will have any problem to
operate with any oil type as long as it has the right density
so that it will provide the correct lubricant effect.
after the lubrication of the oil the oil is burned with the rest of the
i believe that even filtered waste oil from kitchens could be suitable
(as a lubricant) for two stroke engines.
some years i saw an article about a guy who used fried potatoes oil for
his petrol car as fuel (not even as lubricant) with excellent results.
thank you all for your response to my question. it seems to me any one about
to buy a 2 stroke engine, should think very carefully as they may left with
a usless piece of equipment. there are still 2 stroke engines for sale in
U.K. even though government must know they are to be phased out. any one
reading this in the U.K. be warned this govenment will leave you in the
lurch, as they did when you had to scrap your car with the unleaded affair
I really don't see it as a problem. We've had unleaded gas (petrol)
here in the US for a loooooooooooooooooong time and I see no end in
sight for 2 strokes. They definately serve a niche market. I also
don't see a problem with oil either. Even if they got rid of "2
stroke" oil, I'd just use regular oil. We used it in a Poulan chainsaw
for quite a while when we were in a remote area cutting and ran out of
2 cycle oil and it ran just fine.
Men are from Earth. Women are from Earth. Deal with it.
Some of the high performance engines of the era, the big Ford V8 was one, had
poppet valves that rotated slighly with each movement. Touted as a self
grinding effect. I knew of several of those that went down with Sunoco
Sunlight. Never had any effect on heavy engines like old tractors and Briggs
On Mon, 19 Jan 2004 13:59:53 -0000, " R M. Watkin"
The only leaded gasoline sold in the US that I am aware of is a type
of aviation fuel called LL100 (LL=low lead). It is formulated for
older aircraft engines that were originally run on leaded gasoline.
There are fewer and fewer 2 stroke engines being sold; as you
suggested because of their emission problems. They are well on their
way to disappearing in boat motors, recreational vehicles motors, lawn
mowers and similar places where simplicity, light weight, and ease of
repair were virtues.
4 stroke engines are inherently more complex. It may be somewhat like
what has happened with automobile engines. We have traded a simple,
easily maintained design that required more maintenance for more
complex designs that are more reliable and just about impossible for
and ordinary human to repair.
The biggest reason there are so many 2 stroke engines is the terrific
power to weight advantage over the run of the mill 4 stroke. Imagine the
weight of a weed wacker if it were to have say a Briggs and Stratton engine
As for the leaded fuel, the advent of sodium filled valves and stellite
valve seats has removed one need for the lead in the fuel. Top end
lubrication (valves and seats) was only a side benefit leaded fuel with the
largest being the CHEAP octane boost it gave fuels. Much of the fuel on the
market today has the same octane rating as did leaded fuels with the
difference being the cost of processing. As with everything in life the is
an associated cost, on one hand is clean air and lead free environment and
on the other higher fuel cost.
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