Webra 145 with Greve Pipe

[Bill Carpenter]

Wayne,

I wish I could, but I have a meeting with our State Senator Bob Deuell on
Saturday to discuss property taxes.  I need to find out how families on
fixed incomes can pay geometric increases in taxes without being forced to
sell their homes.  I'm anxious to find out because, at the rate my taxes are
increasing, when my school taxes are frozen at age 65, I'll be paying $1000
a month in property taxes.

Would you like me to post his reply?

----------
>From: "wgalligan" <wgalligan at cnbcom.net>
>To: <discussion at nsrca.org>
>Subject: Re: Webra 145 with Greve Pipe
>Date: Wed, Jun 18, 2003, 12:59 PM
>

> Bill,
>
> So now that you have the engine running I guess this means we will see you
> at the First Annual liars contest at Buddy's Nederland this weekend.
>
> WG
>
> ----- Original Message -----
> From: "Bill Carpenter" <bcarpenter at greenvilleisp.net>
> To: <discussion at nsrca.org>
> Sent: Wednesday, June 18, 2003 12:58 PM
> Subject: Re: Webra 145 with Greve Pipe
>
>
>> Thanks for reply,
>>
>> I just came in from doing some pipe tuning and found that, if I peak the
>> pipe, the engine won't come on the pipe from idle unless I pinch the fuel
>> line momentarily, then it "jumps" on the pipe and holds the rpm.  If I
>> richen it up a little the problem gets worse, to the point that the engine
>> will die from loading up if I don't pinch the line.  Lengthening the pipe
>> reduces the rpm but also softens the jumping effect.  I guess this is what
>> the MC carb is all about with the Webra 145??????
>>
>> I think I'll take your advice and run the pipe longer.
>>
>> ----------
>> >From: "Jeff Hughes" <jhughes at hsonline.net>
>> >To: discussion at nsrca.org, <discussion at nsrca.org>
>> >Subject: RE: Webra 145 with Greve Pipe
>> >Date: Wed, Jun 18, 2003, 11:06 AM
>> >
>>
>> > It's really related to RPM. A two stroke has both ports open so some
>> > the intake charge blows out the exhaust, the pipe sets up a pressure
>> > wave which packs this back into the cylinder. As you can visualize,
>> > with a fixed pipe length, this will only work at a specific rpm. So
>> > props with the same load will use similar pipe lengths. But any change
>> > that effects the RPM will require a pipe change. When I was running a
>> > pipe on my 1.40, I deliberately ran it an inch long so it would start
>> > to come on the pipe in the midrange, which softened the "peak". When I
>> > ran dirt bikes, we set them so they were very peaky, all's we cared
>> > about on them was HP.
>> >
>> >
>> >
>> >> You will also notice a difference in results when you use different
>> > prop sizes. As a general rule you need to make the set-up longer if
>> > you use a bigger prop. (Assuming that you had it right in the first
>> > place.
>> >>
>> >> Bigger can mean diameter or pitch. Some sizes interchange well, For
>> > example an APC 17 x 13 can swap with an APC 16 x14 with the same pipe
>> > settings.
>> >>
>> >> Regards,
>> >>
>> >> Eric.
>> >>
>> >> -----Original Message-----
>> >> From: discussion-request at nsrca.org
>> >> [mailto:discussion-request at nsrca.org]On Behalf Of Lee Davis
>> >> Sent: Wednesday, June 18, 2003 11:06 AM
>> >> To: discussion at nsrca.org
>> >> Subject: RE: Webra 145 with Greve Pipe
>> >>
>> >>
>> >> The setup info I give on our web site is generic.  It works, but
>> >> temperature, altitude and fuel type are a few of the variables that
>> > can have
>> >> an effect.  Lengthening the pipe enhanced the mid-range in the
>> > particular
>> >> case I mentioned, though I hesitate to make a blanket
>> > recommendation.  I've
>> >> set up engines for many people.  I doubt any two ended up exactly
>> > alike.  As
>> >> is the case for much of our equipment, manufacturer instructions
>> > will get
>> >> you going, but they are not necessarily the last word.  It is in your
>> >> interest to experiment and optimize.
>> >>
>> >> Lee Davis
>> >> Piedmont Models
>> >> http://www.piedmontmodels.com
>> >>
>> >>
>> >> -----Original Message-----
>> >> From: discussion-request at nsrca.org
>> >> [mailto:discussion-request at nsrca.org]On Behalf Of Keith Black
>> >> Sent: Wednesday, June 18, 2003 1:39 AM
>> >> To: discussion at nsrca.org
>> >> Subject: Re: Webra 145 with Greve Pipe
>> >>
>> >>
>> >> As long as we're talking about the Webra 1.45, RPMs and pipe length,
>> > what
>> >> are some experiences with the Webra 1.45 and the Greve pipe.
>> > Piedmont's web
>> >> site it recommends 27.5" to the first baffle, but recently Lee Davis
>> > posted
>> >> that he has his set at 28.5" to the first baffle.
>> >>
>> >> Mine's actually running pretty well at 27.5", I'm just wondering if
>> > I can
>> >> improve it by moving it back an inch.
>> >>
>> >> Lee, if you read this, why did you move yours out another inch over
>> > what
>> >> your web site recommends? What did this improve (top end, mid range,
>> > etc.)?
>> >>
>> >> Does anyone else have experiences to share with this combination?
>> >>
>> >> Thanks,
>> >> Keith Black
>> >>
>> >> ----- Original Message -----
>> >> From: "Jerry Budd" <jbudd at QNET.COM>
>> >> To: <discussion at nsrca.org>
>> >> Sent: Wednesday, June 18, 2003 12:00 AM
>> >> Subject: Re: Webra 145
>> >>
>> >>
>> >> > >Let's try again - what rpm are you guys getting with what props
>> > with the
>> >> > >Webra 145?  I'm trying to tune mine with a Bolly pipe and have no
>> > idea
>> >> what
>> >> > >to look for.  I'm trying both a 17X10 and 17X12N prop.
>> >> > >
>> >> > >Thanks for any suggestions.
>> >> >
>> >> > 82-8300 rpm when new, 85-8600 rpm after ~30 flights.
>> >> >
>> >> > Magnum #1, OS-F or YS plug, ES-2C140L90 pipe set at 23-1/4" baffle
>> > to
>> >> > plug, stock Mac's 2-1/4" rise header, and an APC 17x12 prop.  The
>> >> > Webra MC (mixture control) carb I'm using gives a dead linear
>> >> > throttle response with NO jump onto the pipe.  Setup this way the
>> >> > motor throttles exactly the same as a DZ but with better
>> > performance.
>> >> > With the stock ProMix carb it throttles a lot like the OS (rich in
>> >> > the mid range).
>> >> >
>> >> > Jerry
>> >> >
>> >> > --
>> >> > ___________
>> >> > Jerry Budd
>> >> > mailto:jbudd at qnet.com
>> >> > =====================================
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>> >
>> > --
>> > CoreComm Webmail.
>> > http://home.core.com
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