My Head is Spinning!

[White, Chris]

Brian, you've had excellent results running Webra 145's without the MC carb.
(I can't imagine your engine running any better:)) From your initial
impressions of the MC carb on your new 160, would you recommend the change
to the MC carb for the 145? (Not ready to change yet, just trying to develop
a competitive attitude:) I know that other experienced pilots believe in it.
(Tony F, Mike Mueller have voiced opinion to that effect in the past....)

I'm just curious how many of you out there are running the 145 without the
MC and feel that it is satisfactory. (Maybe I'm just to new to realize the
benefits?)

Chris White
NSRCA 3601


-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Brian Young
Sent: Friday, January 09, 2004 8:59 AM
To: discussion at nsrca.org
Subject: Re: My Head is Spinning!


I just setup a Webra MC carb, bolted in and running in
about 4 hours. I still have some mixture tweaking to
do. Its easier to adjust the mixture this way than
with a screwdriver, just turn the knob on the radio
once curve is established. Good background in engine
tuning and operation will help you set this engine up.

So far so good. I only have a few flights on it but,
it sure pulls good and throttle seems more linear and
more responsive.

A very handy resource is this list for anyone having
trouble with a fussy engine, plane setup, equipment
selection......etc...

If only I had wireless internet, and a webcam Im sure
I could get some critiques of my practice
flights......lol





--- Keith Black <tkeithb at comcast.net> wrote:
> Lance, I need to correct your correction. The Webra
> Aero X (1.45 and 1.60) being sold today by Horizon,
> Central Hobbies and Radio South, etc. all have the
> aluminum sleeve and weight 28.5 ounces. This feature
> did not disappear when Piedmont stopped selling the
> engine.
> 
> That being said, the Webra is only .8 oz under the
> Mintor 1.70 and that's hardly a good sole reason to
> go with the Webra.
> 
> The truth is if price and compatibility with my
> existing planes/parts wasn't taken into account I'd
> probably go with the Mintor. Smooth transition,
> awesome power, excellent workmanship, no need to
> fiddle with the MC carb (I like to keep things
> simple). However, my post wasn't to convince anyone
> of what to buy but rather to layout my understanding
> of the differences and the options to help Scott
> make his own decision. Until my post prompted your
> detailed reply none of the "experts" had given him
> much to sink his teeth into. Having been in his
> position not that long ago I can relate with his
> dilemma.
> 
> Keith Black
> 
>   ----- Original Message ----- 
>   From: Lance Van Nostrand 
>   To: discussion at nsrca.org 
>   Sent: Thursday, January 08, 2004 11:22 PM
>   Subject: Re: My Head is Spinning!
> 
> 
>   Thanks Keith for laying out the basics.  In
> following Bob P's advice (before he even gave it),
> Keith got the Webras when we were flying them and
> learned from us how to balance pump pressure and
> needle.  Now He's the expert.
>      I want to correct that the Webra 145 requires
> the AeroX/AL sleeve to be lighter than the
> OS/Mintor.  The standard steel sleeve leaves it
> about 1.5 oz heavier.  If you buy an engine from
> Horizon now, or a sleeve, it will be steel.  The
> AeroX was available from Piedmont and Swift, but may
> no longer be available, except as an aftermarket
> upgrade.
>     Once you add the weight of the MC servo, its
> arm, mounting bracket and setup time, I don't see
> the attraction to that engine.  If one was willing
> to do all that, one could get an OS160FX for even
> less money and get all the power with the same
> amount of fiddling.
>     I think the fuel economy is more similar than
> was stated.  but my measurement is being able to fly
> the Masters sequence twice on a 21oz tank.  Isn't
> that enough?  There's actually a lot more throttle
> management in Masters than Intermediate, so maybe
> things balance out.
>     Here are some other comments based on my
> experiences: Webras with the steel sleeve burn
> bearings the fastest, with the AL sleeve it is tied
> with the OS (which is next), and the Mintors last by
> far the longest as long as the engine is used. 
> Nothing stops corrosion, but the double row angular
> contact bearing of the Mintor has twice the load
> capacity, which virtually eliminates load related
> wear.
>      Mintors pack a punch and as a result shake a
> bit more.  More care needs to be taken in the
> header/pipe mounting if softmounting the engine. 
> The Webra is taller and, even though it shakes less,
> can more easily bang the cowling if clearances are
> close.  Webras have a big square head which makes
> this even worse.
>     OS and Mintors (post June 30 production) break
> in fast (about 3 tanks to flight worthiness), Webras
> take longer to break in right (> 1 gal).  I know
> many have claimed flying Webras out of the box, but
> none of the FIVE I own(ed) ever broke in that
> easily.
>      OS and Mintors share the same mounting holes,
> nose ring, prop distance and, exhaust mounting and
> headers.
>      Mixture control can be made linear for all
> engines but the Mintor has a leaner midrange to
> start with so the rest of the tuning is easier.
> Obviously the OS140EFI or MC carb on the webra can
> compensate.
>      The brass fitting into the aluminum case on the
> Webra has failed on my several times.  I prefer the
> bolt together carbs of the other two.  However, the
> Webra has more low end adjustment than either the OS
> or Mintor which can be useful in a pinch (long term,
> extreme needle positions indicate other problems to
> be solved).
>      you need to carry a drive washer puller with
> you for the Webra if you need to change the bearings
> at a contest.
>      the Webra 145 still has the front mounted
> needle, the OS is permanently positioned in the
> rear, the Mintor has a repositionable rear needle. 
> Obviously the 160 MC carb has a servo.
> 
>   OK, no need for me to post offlist.  Please accept
> my experiences as genuine and based on real life
> (not comparing datasheets).  Others may have
> different experiences, but as least mine are based
> on multiple engines all subjected to the same care
> system.
>   --Lance
> 


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