RunRyder - carbsmart with 55p5 problem?

rrTV-PHOTO

New HD TV

HOME rrTV-PHOTO GALLERIES MY GALLERY HELP-FAQ

myHOME PM pmRR MEMBERS 787 ONLINE 25 EVENTS SEARCH REGISTER START HERE

1 page

298 views

POST REPLY

Mikado Modellhubschrauber	.	GrandRC	.	CanoMod
	.		.

Engines Plugs Mufflers Fuel > carbsmart with 55p5 problem?

telix636
Heliman
Location: Italy-Novara

Hi ,some user in Italy tell me" not install carbsmart on webra 55p5" it's will not work well,is better without...
So in Italy ther's low user with webra engine(99% OS) and I ask to us
Thanks
MArco

04-24-2008 04:12 PM

Dr Lodge
Elite Veteran
Location: Guildford, Surrey - UK

Webra's tend to run hot, so the carb smart may not work so well as a result. Webras are also much more difficult to tune.

Assuming the carb smart can operate in the right temperatue zone (130 degrees may be best), it may help with more consistent running. I was for ever playing with the needles on my two Webras - they would start of rich and then lean out as they got hot. The carb smart may help sort out the mixture issues and adjust the needles as necessary as you fly.

Give if it a go and let us know how you get on!

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
Trex 500, Mini Titan, Gaui EP200

04-24-2008 04:46 PM

snobdrs
Veteran
Location: coatesville,pa-usa

i think the reason they tell you not to use, is the webra uses the promix II carb which has a mid needle and a high needle. The big needle that the carbsmart would hook to only adjusts the mixture from 3/4 to full throttle. The heli mostly runs in the midrange say 1/2 to 3/4 throttle so the carb smart would be effective.

Support your local hobby shop

04-24-2008 04:52 PM

Dr Lodge
Elite Veteran
Location: Guildford, Surrey - UK

snobdrs

Note sure I understand what you're saying. Normally, the main needle say on OS engines, only affects the top 1/3 or so of the throttle range. With the promix carb, the main needle has effect over the entire range albeit more effect at open throttle. The mid needle works I think over the lower 2/3s. This is why you have to adjust both needles when altering the mixture, since if you lean the main for more power you have to open the mid so as to keep the partial throttle setting the same.

My hunch is that the carb smart will work with webras, but you may need to use a hotter than usual setting. As I said, best to give it a try.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
Trex 500, Mini Titan, Gaui EP200

04-24-2008 05:23 PM

snobdrs
Veteran
Location: coatesville,pa-usa

i just got this webra 55p5 and it tunes way different then an OS
OS engines then main needle/ big one effects the midrande more on the OS then the Webra. My OS engines only needed a small adjustement on the low end. Most adjustements were made on the big needle.
Now on this webra it seems to be the other way around. Adjusting the small needle makes more of a difference on midrange then adjusting the big needle.
right from webra manual

To grasp the principle of the promix carb it is important to understand that the tapered tip of the mid-range needle affects the full speed range in conjunction with the regulating slot in the spraybar. In practice this means that the midrange needle affects the entire mid-range, i.e. from idle setting to about 3/4 throttle. The high speed needle only affects the high-speed range.

Now if you put a carbsmart on it your only going to be adjusting from 3/4 up.

If you could hook the carbsmart to the mid needle i think it would be more effective.

Support your local hobby shop

04-24-2008 05:45 PM

nivlek
rrProfessor
Location: Norfolk England

What I actually found with my Webra and West engines is the head temp is often lower than my OS engines ! This is recorded with on-board gauges recording the maximum head temp . However , the backplate temp on the Webra was often hotter than the OS after a flight , probably because the thermal transfer is better between the liner and crankcase on Webra engines . This wasn't as noticeable on my West 50 , the heatsink on the backplate might account for this .

As the Doc said , there is usually a lot of interaction between the high and low needles on Webra carbs , I would think that the carbsmart should work well .

At the end of the day , it gets dark .

04-24-2008 05:50 PM

snobdrs
Veteran
Location: coatesville,pa-usa

maybe im way off then. im still breaking this 55 in so....
they way i understood was the the mid needle effects the high needle more then the high effected the mid needle.

Support your local hobby shop

04-24-2008 05:56 PM

telix636
Heliman
Location: Italy-Novara

At the end ,the best operating temperature of webra 55P5? is lower then OS or hotest?

04-24-2008 07:43 PM

J Kofoed
Senior Heliman
Location: Denmark

I use Cab Smart on my West 50H, and it works great.
I running 130 deg, 0% nitro and 12% oil.
I think the cab on West 50H is similar to Webras.

04-24-2008 08:31 PM

HOMEPAGE

telix636
Heliman
Location: Italy-Novara

My friend explane me why is not good idea use carbsmart on webra.
Becouse in the webra carburator the hight speed needle is only for full power,the second speed needle(the smollest) is used to tune the engine from idle to 3/4. the normal range of engine is tuned with second needle and is impossible install carbsmart on this needle(can adjust only with screedriver)

04-25-2008 01:46 PM

J Kofoed
Senior Heliman
Location: Denmark

Yes you are right telix636.
But you still get the right mixture at 75% to 100% throttle.

10-21-2008 06:46 AM

HOMEPAGE

1 page

298 views

POST REPLY

Futaba-RC	.	A Main Hobbies	.	Boca Bearings
	.		.

Engines Plugs Mufflers Fuel > carbsmart with 55p5 problem?

PRINT TOPIC

Advertisers

Subscribe to This Topic