question regarding header & tuned pipe

[Bill Carpenter]

WOW, an adjustable pipe coupled to the throttle - sounds like a million 
dollar idea.  If there isn't already a patent on it, maybe you could develop
one.  Let me know when you get it perfected and I'll buy at least one.

Bill

----------
>From: wgalligan <wgalligan at cnbcom.net>
>To: discussion at nsrca.org <discussion at nsrca.org>
>Subject: Re: question regarding header & tuned pipe
>Date: Tue, Mar 25, 2003, 10:35 AM
>

> When we ran go karts back in the 70's we had our own tuned pipe with an
> adjustable stinger.  When we came out of the turns at low rpm's we had the
> pipe long for the low end power and as we went into the straights or long
> stretchs we would shorten the pipe to get more top end.   Too bad one
> couldnt rig something like this to your throttle.
>
> Wayne
>
>  I too run my os1.40 at 1/2 to 1 inch long to smooth out the midrange
>> and reduce the peakiness of the engine.
>>
>>
>> > Bill,
>> >
>> > This may be optimal for top end but where you really want optimal
>> performance on a 2 stroke is in the midrange and backing up a little
>> helps in that range... so I have been told... and it works on my
>> engine...  so THERE.    Heh! heh!....
>> >
>> >  Wayne,
>> > >
>> > > Good suggestion for tuning the pipe, however, there is a school of
>> thought
>> > > that suggests going a little shorter (or past) optimal rpm on the
>> test stand
>> > > when shortening the pipe, because the engine will unload in the
>> air thus
>> > > increasing rpm.  The result is that you're tuning to a higher rpm
>> in the air
>> > > than on the ground, and higher rpm means shorter pipe.  You can't
>> really
>> > > confirm this unless you find a way to tach the engine in the air.
>> Just a
>> > > thought - my $0.02.
>> > >
>> > > Bill
>> > >
>> > > ----------
>> > > >From: wgalligan <wgalligan at cnbcom.net>
>> > > >To: discussion at nsrca.org <discussion at nsrca.org>
>> > > >Subject: Re: question regarding header & tuned pipe
>> > > >Date: Tue, Mar 25, 2003, 7:40 AM
>> > > >
>> > >
>> > > > I have a header (Karl Mueller type, one of the best custom mades
>> I have
>> > > > seen) that has a smaller diameter then the pipe itself and it
>> does not seem
>> > > > to effect the tuning.  If you can set up your engine on a test
>> stand then
>> > > > move the pipe to a long setup to begin with.  Then move the pipe
>> in a .25
>> > > > inch at a time and check rpm's.  There should be an increase in
>> rpm each
>> > > > move of the pipe.  Keep moving it till the rpm's max out then
>> back the pipe
>> > > > out to the previous position.  This should be the optimal
>> setting for the
>> > > > top end of the rpm range.  Now this can all change depending on
>> prop and
>> > > > fuel so testing with different combinations is usually needed.
>> And the
>> > > > engine will unload in the air a little too so you might have to
>> move the
>> > > > pipe back a touch.  At least thats the way mine setup the
>> best.   Spins a
>> > > > 17x12N APC @8400 on 15% Cool Power.
>> > > >
>> > > > Wayne
>> > > >
>> > > >    > Hi, All,
>> > > >>
>> > > >> I have a question regarding the header & tuned pipe.
>> > > >>
>> > > >> I will be testing a really light Tuned pipe (Japanese F3A pilot
>> is testing
>> > > >> the pipe on OS 140).  It is 550mm length, 48mm diameter, 18mm
>> inlet
>> > > >> diameter.  38g for weight.  I will have to weigh it before
>> believing the
>> > > >> weight of this pipe.
>> > > >> I believe the pipe is being tested with Hatori/OS header
>> > > >>
>> > > >> My headers have diameter of 20mm ~ 22mm (Macs headers) that is
>> larger than
>> > > >> the inlet of the pipe.
>> > > >>
>> > > >> Does the differences in the diameter of Outlet of header and
>> Inlet of pipe
>> > > >> make differences when tuning for the pipe?
>> > > >> thanks,
>> > > >>
>> > > >> Ihncheol Park
>> > > >>
>> > > >> 1973 White Ave., #402
>> > > >> Moscow, ID 83843
>> > > >> (208) 883-7882 (home)
>> > > >> (208) 661-5018 (cellular)
>> > > >> PatternFlyer at msn.com
>> > > >>
>> > > >>
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