Why not a Webra engines thread?
 

Hi everyone !!!

I'like to suggest a thread about Webra engines. They are very powerfull and longlast. They were a success in the '70s handled by multi TOC and F3A Champ Hanno Prettner. They're still powerfull. Just to mention compare a Webra aero R/C .55 specifications (2,1 PS/1,54 kW - 360 grams - 11 x 7 to 12 x 6 props, all with straight fuel (no nitro) and .46 size mount with any other brand.
In time: I'm just a happy owner.

IGOS R/C

RE: Why not a Webra engines thread?
 

Nice, I have two .50 's and a 91P5 which is quite impressive. All of mine run great, are reliable, light and powerful engines.

RE: Why not a Webra engines thread?
 

Lets do it. I have the following, a SilverLine .40, SilverLine .61/roller upper rod bearing, .61f, 3 .91s, two ringed 1 ABC, a P5 .91, a .50 with Dyles ring and a 1.20 with a Dykes ring.

RE: Why not a Webra engines thread?
 

Here are the P-5 and the 1.20 Picture #3 is my .50 wearing a Davis Diesel head turning a Graupner 12x7 at about 9,400 rpm.

RE: Why not a Webra engines thread?
 

Webras!

RE: Why not a Webra engines thread?
 

Hi everyone!!

Good to know about Webra happy owners!!

My power fleet includes a .61 speed (purchased in '71 and still in the box), a .40 speed, a .61 race and Webra tuned pipe, a .61 speed (all in good condition) and two .55 recently purchased. Some are equipped with dynamix carburetors. The .40 has more than 200 flights and powered more than four models (Kaos .40, Gator Flea and some own design) and still keeps the high performance. I will publish some pictures in a near future.

IGOS R/C
Better than one Webra just two Webras !!

RE: Why not a Webra engines thread?
 

Is that an original Dynamax carb? 25 years ago when I had mine, I couldn't get the blasted thing sorted out.

I currently own only the big blocks, 145's and 160's. Guys in the Pattern World in this country were not able to figure them out.... I have however and love the power these engines make.

MattK

RE: Why not a Webra engines thread?
 

My Webras are:

A handful of used (4 or 5 from worn out to nearly new) 1024s and two NIB. Two NIB rear exh. 1030 Racing (1 ABC, 1 ring). Three 1027 SE Long Strokes (new to nearly new) ABC & ring. One used grey head (faded black?) 1020 w/ roller rod (top).

One NIB 1037 .90 Speed.

Five 1055 Speed 120s (two NIB).

One 1034 .40 Speed (used).

Mostly TN/TN2 carbs with a few slide valve carbs.

Terry in LP

RE: Why not a Webra engines thread?
 

Nice triplets, 8178!

Cool collection, Hobbsy.

I have a Speed .61 RE, 10ccm Blackhead, 6.5ccm Blackhead and a Silverline 6.5ccm. I'm always on the lookout for more.

David

RE: Why not a Webra engines thread?
 

Quote:

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ORIGINAL: MTK

Dynamix carb? 25 years ago when I had mine, I couldn't get the blasted thing sorted out.

---

Matt,


The Dynamix™ carburettor needs a relatively high fuel pressure to function properly.

A fuel pump is almost an imperative requirement, since exhaust-pressure is relatively low.
Getting it high enough would require so much back-pressure, the engine's performance would be compromised.


The manual says this, but most people follow this rule; "Only after all else failed, RTFM"...

That's 'Read The Manual' for you...

RE: Why not a Webra engines thread?
 

do they still make Webra engines ?

RE: Why not a Webra engines thread?
 

I and just about every one in the club ran a Webra Speed 61 during the early-mid 70's.
20% caster, 0% nitro... wonderfully.
I don't know if there as powerful compared to todays offerings, but they where certainly hot in those days.
And what fun it was back then.
I can see those little springy needle valves vibrating away as clear as day.

RE: Why not a Webra engines thread?
 

http://www.webra-austria.at/download/en/motor.pdf

Scroll down to the DynaMix carb and item 5 says the DynaMix carb will operate with muffler pressure or a pump, just like any other engine. For anybody with Webra engines tht page is well worth printing. Nobody caught it but the Webra .50 running as a Diesel is wearing an MVVS 7mm carb.

RE: Why not a Webra engines thread?
 

Dave,


Who says no-one noticed the MVVS carburettor?


As to the fuel pressure issue with the Dynamix; the manual does state exhaust pressure can be used, however, experience of people that used this carburettor with the Webra #1024 and #1030F was that with exhaust pressure, you have no chance to land with the engine running...

The engine will invariably quit during flight, often during a pattern maneuver...

Using a Perry (or the then available Robart) pump made completing the pattern sequence possible...


Just to understand the difference in engineering, Dave, an MVVS #3219Q Quickie carburettor, despite its huge 9 mm bore, can run on venturi suction only; although exhaust pressure is recommended.
The smaller bore Dynamix requires pressure and the level provided by the exhaust is borderline...

It is simply not designed to run on venturi suction.

RE: Why not a Webra engines thread?
 

My experience with Dynamix carburator in Webra T-4 works very well without fuel pressure either it is a pump or muffler pressure.

If in doubt, i can take a movie of the engine running without fuelpressure and add in the youtube next time i get "negative" answer..

RE: Why not a Webra engines thread?
 

Speed 20, 40, 61 Marine

All reworked from new with ceramic hybrid bearings with stainless steel races and phenolic cages. All parts have been deburred, polished, hand spotted, lapped, ect. fully by hand. assembled with stainless screws, and have their own line-up of new spares, shims, gaskets, plus original manuals and spare rear covers with pressure taps.

Each will be put into its own size of Dumas Drag N' Fly hydroplanes to make a matched family of boats, and also have their choice of a TN, MC, or Dynamix carbs each.

I love Old School! Webra's are wonderful engines, and sure like the idea of a low-nitro diet.

The engine collection has taken over three years of effort, and definently not leaving anytime soon. [sm=tongue_smile.gif]

BTW: Ya'll can have your eBay back...I'm done for now.:D

Thanks to Webra-Austria and all that have helped with my questions along the way, this is the best bunch of banana's on the planet.[8D]

RE: Why not a Webra engines thread?
 

Hi!
Webra are still going strong!
The Webra GT .40 is the most powerful standard sport engine on the market (on 80/20 fuel) and has been so for decades.
The GT .40 has been the dominating engine in newcommer Q-500 pylon (424 to you americans) over here in Sweden for many years, only recently has an equal competitor shown up...and thats the Kyosho GX .40, better known as ASP.40.

RE: Why not a Webra engines thread?
 

Webras are supercool. i'm running West engines (weston uk), 50V1, 36v1. These are super tuned webras. Weston modify the webra to get more power out it and works.
Look at the success of the MagnumR plane with west 50v1 and their genesis tuned pipe set up. Awesome power plant.
I've run them only on fully high quality synthetic fuel(prosynth). Sometimes on super competition prosynth with only 7.5 oil. The engine after is so cold you could chill your beers on it!!

RE: Why not a Webra engines thread?
 

Hi!
Webra are still going strong!
The Webra GT .40 is the most powerful standard sport engine on the market (on 80/20 fuel) and has been so for decades.
The GT .40 has been the dominating engine in newcommer Q-500 pylon (424 to you americans) over here in Sweden for many years, only recently rivaled by the Kyosho GX .40, better known as ASP.40.

RE: Why not a Webra engines thread?
 

Daves, plural, when you have a box of mufflers like I do there is no tellin what you might find. Picture #1 & 2 is very likely a muffler some of you used back in the day. Picture #3 is a K&B .61 Twister muffler that bolts right onto the SilverLine .61. Pic. #4 is most of my muffler collection.

RE: Why not a Webra engines thread?
 

Hobbsy...that muffler in your 1st two pics is a Silenceaire (or some similar spelling ) made sometime in the early 70's.

I have an old 1.5cc Diesel...1950's vintage...it has red (or now sort of pink ) anodized fins.
4 .50 GT's and 3 .61 Speeds...and one 1.20
Love 'em all [8D]

RE: Why not a Webra engines thread?
 

Any Enya .25X mufflers in there?:D I will probably have to try and get someone to machine an adapter for me that will bolt to the 24mm wide case holes and have outer holes spaced for another muffler, like an ASP/Magnum or GMS .25 muffler.

David

RE: Why not a Webra engines thread?
 

The reason Webra never took off in this country was the lack of instructions written clearly in English, plus a lack of explanation regarding the high compression ratio that would lead to preignition and overheating if conventional US nitro amounts were used without reducing the compression. Why Webra put up with this kind of behavior from their US distributors has always puzzled me. Webra engines are among the best on the planet, as far as I'm concerned.


Ed Cregger

RE: Why not a Webra engines thread?
 

I have a Webra 145 I came by second hand, seems to be in good shape, pipe & header in the package. I haven't installed it in anything, but would like to fly it next year. Anybody have experience with this engine, recommendations for fuel, prop, header length, head shims? It has high & low needles, no mid-range adjustment.

RE: Why not a Webra engines thread?
 

Quote:

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ORIGINAL: Motorboy

My experience with Dynamix carburator in Webra T-4 is that works very well without fuel pressure, whether it is a pump, or muffler pressure.

If in doubt, I can take a movie of the engine running without fuel pressure and add it in 'YouTube' next time I get "negative" answer..

---

Jens,


I am here to discredit, or to cross, neither you, nor Dave Hobbs...

I am sure any Webra engine can run with the Dynamix carburettor and as to T-4 engine; perhaps its Dynamix's bore is 'reshaped' to provide some suction.


I am only telling about such carburettors that I actually faced and what the Webra instructions actually say about it (and also about UltraMix and ProMix carburettors).
"It is not designed to work on suction feed"...

The TN/TN II is a pretty good carburettor (perhaps not as good as the new MVVS #3216/3219, though :D...) and its instructions do not state pressure is required.