what about tuned mufflers??

[Paris]

hi

i recently ordered a hatori muffler (710) for my raptor 60 ( tt70
engine),which i havn't received yet.
can i expect a power boost? or are these mufflers just "shiny
replacements'' with minor better performance (if any) as a side effect?

i know that a tuned pipe would do the "real job",but does the muffler do at
least a
5-10% overall performance boost?





"Beav" <beavis.original@ntloxoworld.com> wrote in message
news:OXNsa.1258427$HU.184538@news.easynews.com...
>
> "Andy Carpenter" <andy@REMOVEcarpsTHE.coUPPER.ukCASE> wrote in message
> news:b8vmag$o6q$1@titan.btinternet.com...
> >
> > "OldSchool" <OldSchool@here.com> wrote in message
> > news:tee6bvs2bj8la50oua1ccgdgs1uqb71t14@4ax.com...
> > >
> >
> > You have to set the length correctly to get the optimum performance
> fromyour
> > engine. This is done by adjusting the length of the gap between the end
> of
> > the manifold and the start of the pipe using a plastic (teflon) joiner
or
> > something similar. If you cannot get the pipe short enough then you cut
> > some length off the manifold or the pipe.
> > A lot of engines have a recommended pipe length which you can set as a
> > starting point. If this is the case, then the distance is measured from
> the
> > face of the piston in the exhaust port to the first baffle in the pipe.
>
> And the recommended lengths are always WAAAYYY too long, but for good
> reason.
>
> The "standard" length as supplied will give a boost to power, as opposed
to
> silencers/mufflers, which ALL strangle the engine to some degree causing a
> LOSS of power, yet still retain a lot of flexibility with carb settings
and
> allow a pretty wide rev range where the power is produced.. The shorter we
> go with a pipe, the more power it'll let the engine produce, but always at
> higher revs and always within a "shortening" rev range. This is why people
> associate pipes with "peakiness", and the TRULY well tunes pipe/engine
> combination will have a VERY VERY narrow power band (rev range) but give
> HUGE amounts of power when compared to the same engine running a muffler.
>
> What we have to decide is.....do we want the absolute max power from the
> engine, at the expense of tractability, or do we accept a small sacrifice
> drop in peak power for an easy to use system. Us heli blokes usually opt
for
> the 2nd option because we have a varying rev requirement, whereas the
ducted
> fan blokes will go with the 1st because all the want is a screaming demon
in
> their machines.
>
> Like the old saying goes, there're no free lunches, but the pipes today
are
> FAR better than a muffler, even if they've not been tuned to perfection.
>
> I personally wouldn't entertain a heli with a muffler when they're are
pipes
> like the NovaRossi and Rossi pipes out there just waiting to be bought.
>
>
> --
> Beav
>
>
> Please note my E-mail address is "beavis dot original at ntlworld dot com"
> (with the obvious changes)
>
> Beavisland now lives at
> www.beavisoriginal.co.uk
>
>

[Beav]

"Paris" <para po@hot2mail.c%om> wrote in message
news:b9177s$2k50$1@ulysses.noc.ntua.gr...
> hi
>
> i recently ordered a hatori muffler (710) for my raptor 60 ( tt70
> engine),which i havn't received yet.
> can i expect a power boost?

Indeed you can, if you actually TUNE it and don't just slap it on, but even
then, you'll get more power than you would with a standard muffler.

or are these mufflers just "shiny
> replacements'' with minor better performance (if any) as a side effect?

They're shiny, but THAT'S the side effect, the REAL reason for buying them
is because they "do what it sez on the tin" and that's allow you to get the
maximum power out of the engine without resorting to mechanical mods.

>
> i know that a tuned pipe would do the "real job",but does the muffler do
at
> least a
> 5-10% overall performance boost?

A muffler does at least a 5% REDUCTION in overall performance. They can't do
anything else because their job is to restrict the flow of gas getting out
of the engine and that causes a power drop. No 2 stroke racing machine
(Bike, Quad, Lawnracer, whatever) uses a muffler, they ALL use tuned pipes.


--
Beav


Please note my E-mail address is "beavis dot original at ntlworld dot com"
(with the obvious changes)

Beavisland now lives at
www.beavisoriginal.co.uk