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Re: Are 2-cycle engines or 4 cylce engines 'better'?

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Re: Are 2-cycle engines or 4 cylce engines 'better'? Nathan Gant 06-13-2005
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Posted by Nathan Gant on June 13, 2005, 12:00 pm
Yeah, 2 cycles suck bigtime! I've read that 2-cycle motors are banned in
certain areas in California - makes sense to me, they have twice the exhaust
stoke of 4-cycle so there is definitely an air pollution issue here. Also
noisier than 4-cycle. I bought the 4-cycle Troy-bilt weedeater, too. Yes,
it is heavier but I worked with 2 cycle weedeates for too many years, sick
of the fumes, noise, grease, I'd never go back now. I can't think of any
reason why you'd want to have a 2 cycle motor when 4 cycles are getting more
common for lawn work now.

>
> > Because I've been tempted to buy some of the new Honda 4 cylcle
> > engine-powers garden equipment, and until recently the really small
> > engines have always been 2 cycle. Or at least I think they have.
> >
> > Dean
>
> Just bought a 4 cycle Troy-Bilt string trimmer and I am happy with it so
> far. Here are some things I have found.
> It weighs about 1 pound more than the 2 cycle model (as stated in
brochure).
> The 4 cyc units cost about $60 more than similar 2 cycle models.
> The 4 seems to vibrate a bit more, but not too bad.
> It seems quieter than the 2, but I still wear ear plugs.
> After using the 4, my hair & cloths don't smell like burnt oil gas mix.
> My owners manual states that a valve clearance adjustment must be done
every
> so often. 10 hrs 1st time - 25 hours after that. Same for oil changes.
>
> I went to the 4 because I was tired of having to mix oil/gas. I have 3
> different things with 2 cyc engines, and all 3 required different mix
ratio.
>
> Kevin
>
>
>



AppliancePartsPros.com, Inc.
Posted by Edwin Pawlowski on June 13, 2005, 7:34 pm

> Yeah, 2 cycles suck bigtime! I've read that 2-cycle motors are banned in
> certain areas in California - makes sense to me, they have twice the
> exhaust
> stoke of 4-cycle so there is definitely an air pollution issue here.

Your conclusion is correct, but the reasons are wrong. The number of strokes
does not determine how much pollution is emitted. Displacement, quantity of
fuel, content of oil are more important.



Posted by Michael Daly on June 14, 2005, 1:20 am

> Displacement, quantity of
> fuel, content of oil are more important.

Not to mention that you are mixing incoming air/fuel with
exhaust in each stroke, resulting in poor combustion... I
wonder if a high ethanol fuel would be cleaner for a 2 stroke?

Mike

Posted by Duane Bozarth on June 14, 2005, 9:46 am
Michael Daly wrote:
>
>
> > Displacement, quantity of
> > fuel, content of oil are more important.
>
> Not to mention that you are mixing incoming air/fuel with
> exhaust in each stroke, resulting in poor combustion... I
> wonder if a high ethanol fuel would be cleaner for a 2 stroke?
>

What do 2-stroke mfr's say about >E10 and oil mixtures?

Superficially, I'd think lubrication would be even more difficult.

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