"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.