Constant Depression Carbs on a Rotax 503

Has anyone ever experimented with the Constant Depression carbs on a
503?

Since these carbs are supposed to be inherently "altitude
compensating", I wonder why more people haven't tried them.

Ed where did you see them carbs? Is there any link we could see them?
Thanks

J.P.


"Ed Baker" <ejb@theworld.com> a écrit dans le message news:
e84bf2d7.0309081034.5b732d6c@com...
> Has anyone ever experimented with the Constant Depression carbs on a
> 503?
>
> Since these carbs are supposed to be inherently "altitude
> compensating", I wonder why more people haven't tried them.

"Jean-Paul Roy" <jean-paul.roy4@sympatico.ca> wrote in message
news:zA87b.1531$fC5.419712@news20.bellglobal.com.. .
> Ed where did you see them carbs? Is there any link we could see them?
> Thanks

> "Ed Baker" <ejb@theworld.com> a écrit dans le message news:
> e84bf2d7.0309081034.5b732d6c@com...
> > Has anyone ever experimented with the Constant Depression carbs on a
> > 503?
> >
> > Since these carbs are supposed to be inherently "altitude
> > compensating", I wonder why more people haven't tried them.
>

I'm no engineer, but I have been around CV or CD carbs for years on bikes. I
can think of a few down sides to them. As you reduce power, even a little,
CV carbs tend to shut right down and then recover. It is irritating on a
bike, might be worse on a plane. Also the slides can be heavy on some
designs, and would respond to G-loading by floating up and down. In the case
of an aborted short field landing, you would be trying to get full power,
and the slides might float down a little.

These carbs are used on the HKS-700e and they are also popular on
numerous motorcycles ... especially BMW.

The H-Power website has some good shots of them:
http://www.hpower-ltd.com/pages/pictures.htm

You can also get lots of hits (but not very many pictures) by doing a
google search on "Bing Constant Depression". Leave off the quotes if
you do a search.

"Jean-Paul Roy" <jean-paul.roy4@sympatico.ca> wrote in message news:<zA87b.1531$fC5.419712@news20.bellglobal.com> ...
> Ed where did you see them carbs? Is there any link we could see them?
> Thanks
>
> J.P.
>
>
> "Ed Baker" <ejb@theworld.com> a écrit dans le message news:
> e84bf2d7.0309081034.5b732d6c@com...
> > Has anyone ever experimented with the Constant Depression carbs on a
> > 503?
> >
> > Since these carbs are supposed to be inherently "altitude
> > compensating", I wonder why more people haven't tried them.

Ed Baker wrote:

>Has anyone ever experimented with the Constant Depression carbs on a
>503?
>
>Since these carbs are supposed to be inherently "altitude
>compensating", I wonder why more people haven't tried them.
>
>

Why not just get a HAC (High Altitude Carb) kit for your existing
carbs. I will be cheaper than buying new ones?

You can get them from :

http://www.buyitsellitfixit.com/hac.htm

I have one on my 582 and it works great!

keep smiling

Rob from Ontario

One of the things I, absolutely, hate doing is changing the effing
needle clip for winter conditions versus summer conditions.

I wouldn't mind having to change the main jet, as that is a much
simpler thing to do.

Does using the Olenik HAC kit help with these scenarios?

Robert Schieck <rschieck@mers.com> wrote in message news:<3F5E00D8.8090601@mers.com>...
> Ed Baker wrote:
>
> >Has anyone ever experimented with the Constant Depression carbs on a
> >503?
> >
> >Since these carbs are supposed to be inherently "altitude
> >compensating", I wonder why more people haven't tried them.
> >
> >
>
> Why not just get a HAC (High Altitude Carb) kit for your existing
> carbs. I will be cheaper than buying new ones?
>
> You can get them from :
>
> http://www.buyitsellitfixit.com/hac.htm
>
> I have one on my 582 and it works great!
>
> keep smiling
>
> Rob from Ontario

The kit from Olenik is actually a Rotax/Bing HAC kit for Rotax engines.

Once you put it in, no clips to move no jets to change.

hth

Rob from Ontario

Ed Baker wrote:

>One of the things I, absolutely, hate doing is changing the effing
>needle clip for winter conditions versus summer conditions.
>
>I wouldn't mind having to change the main jet, as that is a much
>simpler thing to do.
>
>Does using the Olenik HAC kit help with these scenarios?
>
>Robert Schieck <rschieck@mers.com> wrote in message news:<3F5E00D8.8090601@mers.com>...
>
>
>>Ed Baker wrote:
>>
>>
>>
>>>Has anyone ever experimented with the Constant Depression carbs on a
>>>503?
>>>
>>>Since these carbs are supposed to be inherently "altitude
>>>compensating", I wonder why more people haven't tried them.
>>>
>>>
>>>
>>>
>>Why not just get a HAC (High Altitude Carb) kit for your existing
>>carbs. I will be cheaper than buying new ones?
>>
>>You can get them from :
>>
>>http://www.buyitsellitfixit.com/hac.htm
>>
>>I have one on my 582 and it works great!
>>
>>keep smiling
>>
>>Rob from Ontario
>>
>>

In article <e84bf2d7.0309091335.11af9c6@com> , Ed Baker
wrote:
> One of the things I, absolutely, hate doing is changing the effing
> needle clip for winter conditions versus summer conditions.
>
> I wouldn't mind having to change the main jet, as that is a much
> simpler thing to do.
>
> Does using the Olenik HAC kit help with these scenarios?
>

Once installed it is like a one of those Ronco Ovens, you set it and
forget it.

No changes necessary for summer or winter conditions. No changes if you
move from a low elevation airport to a high elevation airport.

hth

Rob from Ontario

I have been useing a pair of Stromberg CD 175s on a Corvair and they work
very well just set them up a little rich. Had to make a manifold just used
part of the old TR7 manifold and welded it to a piece of muffler pipe then
to another flange to go into the Corvair's head. I dont see why it would not
work on a Rotax.
Have fun, watch out for the Cow Poo
Mitch

"Jean-Paul Roy" <jean-paul.roy4@sympatico.ca> wrote in message
news:zA87b.1531$fC5.419712@news20.bellglobal.com.. .
> Ed where did you see them carbs? Is there any link we could see them?
> Thanks
>
> J.P.
>
>
> "Ed Baker" <ejb@theworld.com> a écrit dans le message news:
> e84bf2d7.0309081034.5b732d6c@com...
> > Has anyone ever experimented with the Constant Depression carbs on a
> > 503?
> >
> > Since these carbs are supposed to be inherently "altitude
> > compensating", I wonder why more people haven't tried them.
>
>

"Mark Smith" <mark@trikite.com> wrote in message
news:3F5E921A.1452@trikite.com...
> Ed Baker wrote:
> >
> > One of the things I, absolutely, hate doing is changing the effing
> > needle clip for winter conditions versus summer conditions.
> >
> > I wouldn't mind having to change the main jet, as that is a much
> > simpler thing to do.
>
>
> I don't change the clip for winter or summer, just leave it alone and
> fly,
>
> but I am curious, why is it so hard ?
>
> I have diagnosed carb problems by getting them to relate the difficulty
> in changing the clip, and always find they are installing the
> needle/clip on top of the white plastic piece, which I have tried to do,
> and found it to be at least an order of difficulty harder,,,,,,,,

I wind the return spring on and off over an assembled slide/throttle cable
rather than try to compress the spring and stick the throttle cable end
through there... what a mess... The winding catches the clip-on-top-of-cup
dealie right away, as the spring tends to catch on the clip as I rotate
it.... still sometimes put the clip on top even after having done this a
billion times....

LS
AC fun racer 503.

>
>
> Mark Smith
> Tri-State Kite Sales http://www.trikite.com
> 1121 N Locust St
> Mt Vernon, IN 47620 mailto:mark@trikite.com