2-Stroke, Unleaded to Superunleaded
 

Hi everyone,
I reciently got a new toy.
It has a 2-stroke engine similar to one found in a brush cutter and at the moment i run it on a 25:1 mix of unleaded and 2-stroke oil.
I have been wondering what would happen if i ran it on the same 25:1 mix but used super unleaded rather than normal unleaded.
Would it make it run faster as basic logic would suggest or would it blow the thing up like Mr. Paranoia keeps telling me?

Hope you don't mind be posting this here it is sort of gardening related because i use it to...........errr.......chew up the garden, i figured that there has to be at least one gardener out there who has tried this on a mower/strimmer etc.

Hope to get some info soon
Cheers
Tim

TRBomb05 wrote:
Hi everyone,
I reciently got a new toy.
It has a 2-stroke engine similar to one found in a brush cutter and at
the moment i run it on a 25:1 mix of unleaded and 2-stroke oil.
I have been wondering what would happen if i ran it on the same 25:1
mix but used super unleaded rather than normal unleaded.
Would it make it run faster as basic logic would suggest or would it
blow the thing up like Mr. Paranoia keeps telling me?

Hope you don't mind be posting this here it is sort of gardening
related because i use it to...........errr.......chew up the garden, i
figured that there has to be at least one gardener out there who has
tried this on a mower/strimmer etc.

Hope to get some info soon
Cheers
Tim




If you use higher octane gasoline, the fuel will last longer in storage.
That's about it. A lot of 2-cycle engines specify 89 octane, and most
regular unleaded gas here is 87 octane.

I buy a can of premium in the spring to use for the first tank in the
lawnmower and tiller because they start easier after storage that way (I
don't know why.) Then I switch back to regular.

Bob

On Sat, 9 Jul 2005 19:36:56 +0000, TRBomb05
wrote:


Hi everyone,
I reciently got a new toy.
It has a 2-stroke engine similar to one found in a brush cutter and at
the moment i run it on a 25:1 mix of unleaded and 2-stroke oil.
I have been wondering what would happen if i ran it on the same 25:1
mix but used super unleaded rather than normal unleaded.
Would it make it run faster as basic logic would suggest or would it
blow the thing up like Mr. Paranoia keeps telling me?

Hope you don't mind be posting this here it is sort of gardening
related because i use it to...........errr.......chew up the garden, i
figured that there has to be at least one gardener out there who has
tried this on a mower/strimmer etc.

Hope to get some info soon
Cheers
Tim
I don't think you'd notice a difference in the performance, but at
least one chainsaw repair guy I've talked to says you should use
premium to get more life out of the motor. I do it all the time with
no blowing up.

k

Treedweller wrote:
On Sat, 9 Jul 2005 19:36:56 +0000, TRBomb05
wrote:


Hi everyone,
I reciently got a new toy.
It has a 2-stroke engine similar to one found in a brush cutter and at
the moment i run it on a 25:1 mix of unleaded and 2-stroke oil.
I have been wondering what would happen if i ran it on the same 25:1
mix but used super unleaded rather than normal unleaded.
Would it make it run faster as basic logic would suggest or would it
blow the thing up like Mr. Paranoia keeps telling me?

Hope you don't mind be posting this here it is sort of gardening
related because i use it to...........errr.......chew up the garden, i
figured that there has to be at least one gardener out there who has
tried this on a mower/strimmer etc.

Hope to get some info soon
Cheers
Tim

I don't think you'd notice a difference in the performance, but at
least one chainsaw repair guy I've talked to says you should use
premium to get more life out of the motor. I do it all the time with
no blowing up.

k


Actually, higher octane gasoline reduces the chances of blowing up the
engine, as it reduces knock (pre-ignition). Knock is especially
noticeabl when the car accelerates. It also reduces carbon build-up. If
you use it for your 4-cycle (automobile) engine, it will extend the
life of the engine. It also provides a small performance/efficiency
boost, so that you will get about 5-10% better mileage (other things
being equal.)

BTW, 2-cycle engines are horrendous polluters compared to 4-cycle
engines. Your 2-cycle lawnmower will produce at least as much pollution
as your car in the same amount of running time.

"TRBomb05" wrote in message
...

Hi everyone,
I reciently got a new toy.
It has a 2-stroke engine similar to one found in a brush cutter and at
the moment i run it on a 25:1 mix of unleaded and 2-stroke oil.
I have been wondering what would happen if i ran it on the same 25:1
mix but used super unleaded rather than normal unleaded.
Would it make it run faster as basic logic would suggest or would it
blow the thing up like Mr. Paranoia keeps telling me?

That "basic logic" is incorrect.

The Low-Down on High Octane Gasoline
http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm
"In fact, in most cases, using a higher octane gasoline than your owner's
manual recommends offers absolutely no benefit. It won't make your car
perform better, go faster, get better mileage or run cleaner."

What does octane mean?
http://auto.howstuffworks.com/question90.htm
"The compression ratio of your engine determines the octane rating of the
gas you must use in the car."

"Wolf Kirchmeir" wrote in message
. ..
Treedweller wrote:
On Sat, 9 Jul 2005 19:36:56 +0000, TRBomb05
wrote:


Hi everyone,
I reciently got a new toy.
It has a 2-stroke engine similar to one found in a brush cutter and at
the moment i run it on a 25:1 mix of unleaded and 2-stroke oil.
I have been wondering what would happen if i ran it on the same 25:1
mix but used super unleaded rather than normal unleaded.
Would it make it run faster as basic logic would suggest or would it
blow the thing up like Mr. Paranoia keeps telling me?

Hope you don't mind be posting this here it is sort of gardening
related because i use it to...........errr.......chew up the garden, i
figured that there has to be at least one gardener out there who has
tried this on a mower/strimmer etc.

Hope to get some info soon
Cheers
Tim

I don't think you'd notice a difference in the performance, but at
least one chainsaw repair guy I've talked to says you should use
premium to get more life out of the motor. I do it all the time with
no blowing up.

k


Actually, higher octane gasoline reduces the chances of blowing up the
engine, as it reduces knock (pre-ignition).

Only if it's not tuned up and the ignition timing is wrong.

Knock is especially
noticeabl when the car accelerates. It also reduces carbon build-up. If
you use it for your 4-cycle (automobile) engine, it will extend the
life of the engine. It also provides a small performance/efficiency
boost, so that you will get about 5-10% better mileage (other things
being equal.)

The Low-Down on High Octane Gasoline
http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm
"In fact, in most cases, using a higher octane gasoline than your owner's
manual recommends offers absolutely no benefit. It won't make your car
perform better, go faster, get better mileage or run cleaner."


BTW, 2-cycle engines are horrendous polluters compared to 4-cycle
engines. Your 2-cycle lawnmower will produce at least as much pollution
as your car in the same amount of running time.

At least what you say here is true.

It will empty your wallet a little faster but that's about it.

zxcvbob wrote:
TRBomb05 wrote:

Hi everyone,
I reciently got a new toy.
It has a 2-stroke engine similar to one found in a brush cutter and at
the moment i run it on a 25:1 mix of unleaded and 2-stroke oil.
I have been wondering what would happen if i ran it on the same 25:1
mix but used super unleaded rather than normal unleaded. Would it make
it run faster as basic logic would suggest or would it
blow the thing up like Mr. Paranoia keeps telling me?

Hope you don't mind be posting this here it is sort of gardening
related because i use it to...........errr.......chew up the garden, i
figured that there has to be at least one gardener out there who has
tried this on a mower/strimmer etc.

Hope to get some info soon
Cheers Tim




If you use higher octane gasoline, the fuel will last longer in storage.
That's about it. A lot of 2-cycle engines specify 89 octane, and most
regular unleaded gas here is 87 octane.

I buy a can of premium in the spring to use for the first tank in the
lawnmower and tiller because they start easier after storage that way (I
don't know why.) Then I switch back to regular.

Bob

cat daddy wrote:
"Wolf Kirchmeir" wrote in message
[...]
Actually, higher octane gasoline reduces the chances of blowing up the
engine, as it reduces knock (pre-ignition).


Only if it's not tuned up and the ignition timing is wrong.

True. And when the car is tuned for high octane, there is a noticeable
performance and some mileage boost. Leastways, there is with my Taurus.
But many, many cars are poorly tuned, and high octane gas will reduce
knock in those situations.

Whether it's worth buying high octane for these performance and mileage
gains is another issue. Some years ago, a colleague (who happened to be
an autmotives teacher) did two 6-month trials with his Buick, one with
low octane and one with high octane gas, and figured that so long as the
price differential was 10% or less, high octane was worth buying. In
those days the price differential _was_ 10% or less. Not any more. :-(

Knock is especially
noticeabl when the car accelerates. It also reduces carbon build-up. If
you use it for your 4-cycle (automobile) engine, it will extend the
life of the engine. It also provides a small performance/efficiency
boost, so that you will get about 5-10% better mileage (other things
being equal.)


The Low-Down on High Octane Gasoline
http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm
"In fact, in most cases, using a higher octane gasoline than your owner's
manual recommends offers absolutely no benefit. It won't make your car
perform better, go faster, get better mileage or run cleaner."

That "in _most_ cases" is the hidden hook... :-)

BTW, 2-cycle engines are horrendous polluters compared to 4-cycle
engines. Your 2-cycle lawnmower will produce at least as much pollution
as your car in the same amount of running time.


At least what you say here is true.

One reason I use a real type push mower. T'other reasons a easier to
use (the push mower is much lighter), and the reel blades cut the grass
rather than smash it off. Also, you have to cut more often, as the reel
mower doesn't handle high grass very well. More exercise for me. :-)

Wolf Kirchmeir writes:
Also, you have to cut more often, as the reel mower doesn't handle
high grass very well. More exercise for me. :-)

heh... I keep the power mower in reserve for just such an occasion.
(cut the high parts just yesterday in fact.)

I hope to find enough time to reel mow the rest of the year...
I hate the noisy beast.

I suppose I could get a scythe for the long stuff. ;)

--
be safe.
flip
Ich habe keine Ahnung was das bedeutet, oder vielleicht doch?
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Philip Lewis wrote:
Wolf Kirchmeir writes:

Also, you have to cut more often, as the reel mower doesn't handle
high grass very well. More exercise for me. :-)


heh... I keep the power mower in reserve for just such an occasion.
(cut the high parts just yesterday in fact.)

I hope to find enough time to reel mow the rest of the year...
I hate the noisy beast.

I suppose I could get a scythe for the long stuff. ;)


I have a scythe, Austrian made, must be 60 years old at least. Haven't
used it in years, it was always hard to keep sharp, and if it's not
sharp enogh to slice a feather drifting onto it, it's a real pain to cut
grass with. Besides, there's a real trick to doing it right, if you
don't, you'll have one mother of a backache.

Hah!

Well you have to pound the edge thin to work harden it between a cross
pein hammer and a small anvil and then use a scythe stone to dress the
edge.
If the edge is just continually stoned it just gets thicker or worn
away but when you beat it out it lasts and you get good cutting.