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HelicopterGasser Model RC HelicoptersOther › WEBRA 90 P5i and JR Sylphide 90
12-25-2008 11:30 AM  8 years agoPost 1
SPITFIREMK117

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FRANCE

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Hi !
I'm new on runrider and french, so my english level is a bit low...
However, I have a WEBRA 90 P5i gas engine, but it warms a lot !
Have somebody any solution ?
Should I put a larger cooler fan ? WHere buy it ?
Thanks

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12-25-2008 12:00 PM  8 years agoPost 2
gorn

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Western Australia

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There is a lot of discussion about this motor here, but not recently.
Do a seacrh and you will find that almost everyone who had this motor had cooling issues.
Right size with a lot of potential, but just runs far to hot to be practical.

For the love of the hobby

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12-25-2008 04:41 PM  8 years agoPost 3
Fixit

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UK

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I have a WEBRA 90 P5i gas engine, but it warms a lot !
Have somebody any solution ?
The best solution is a refund, failing that you have a very expensive paper weight,

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12-25-2008 08:37 PM  8 years agoPost 4
SPITFIREMK117

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FRANCE

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You told me it will be better to sell this engine ?
Why ? I don't understand ...
Precise your mind please !

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12-26-2008 12:31 AM  8 years agoPost 5
copperclad

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NY

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hi SPITFIREMK117

a few people tried getting the Webra 90 P51 to work a year or so ago here on RR , as i recall , no body was able to get it to run without overheating , and there was also trouble getting them to run consistantly

here is one thread , there were a few others

http://www.runryder.com/helicopter/...highlight=WEBRA

i am interested to know if perhaps Webra has made changes to the engine since last year , and it is quite posible that your engine is an improved model and will not have the same problems people had last year

can you tell if there is a teflon insulator between the carburator and the case of the engine , and can you post photos of your engine , webra may be using a better carb now , than they were

thanks , dana

here is one of the threads on the webra , sorry it is so long , as you get towards the end you will see how much trouble people were having
http://www.runryder.com/helicopter/...highlight=webra

.

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12-26-2008 12:58 PM  8 years agoPost 6
SPITFIREMK117

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FRANCE

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Hi !
Webra stops the 90 P5i for helicopters, still selling airplain version.
New model is the 150 P5i, without heating problems, I think.
http://www.webra-austria.at/motor.p...er=HELI&lang=EN
Thierry

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12-26-2008 01:38 PM  8 years agoPost 7
copperclad

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NY

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hi Thierry

thanks , i am very interested how well you do with your engine , as it would be perfect for converting heli kits to gas , i will cross my fingers for your success , hopefully someone who has experience with the newer webra will get on and post some info , cheers dana

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12-26-2008 03:48 PM  8 years agoPost 8
Fixit

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UK

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Hi Dana

The 150 has been out for some time now and the end results aren’t much better than the 90.
http://runryder.com/helicopter/t407...ight=webra+150i

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12-26-2008 03:53 PM  8 years agoPost 9
pgkevet

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Wales

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...one fo the reported disadvantages seems to be the need for a megapowerful starter?

..out of interest has anyone tried cutting nitro fuel with a bit of gas? could it work well enough to be a bit cheaper? Or any chesmists outt here that could figure a way of mixing some other oxidiser in?

pgk

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12-26-2008 08:14 PM  8 years agoPost 10
SPITFIREMK117

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FRANCE

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I think it is not possible,
gas and methanol temp. combustion are different
you can try to translate this article ( in french )
http://fr.wikipedia.org/wiki/Moteur_%C3%A0_explosion
I will search something in english !

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12-26-2008 08:45 PM  8 years agoPost 11
Fixit

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UK

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12-27-2008 07:36 AM  8 years agoPost 12
SPITFIREMK117

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FRANCE

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It doesn't work because of compression ratio:
for gas you need nearly 10:1, but for methanol it must be nearly 18:1
it's one of the reasons....

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12-27-2008 07:39 AM  8 years agoPost 13
SPITFIREMK117

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FRANCE

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Hi PGKEVET,
what you've said is incorrect:
"...one fo the reported disadvantages seems to be the need for a megapowerful starter?"
see my post below about compression ratio !

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12-27-2008 08:00 AM  8 years agoPost 14
pgkevet

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Wales

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...I found some posts re this on another forum where the guy claimed to have had to shove 24v across his dynatron to turn the engine over..

...I'll accept what you say about compression ratios and other comments re combustion temperature... but how they apply to a hybrid fuel mix may be different..??

pgk

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12-27-2008 08:06 AM  8 years agoPost 15
SPITFIREMK117

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FRANCE

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I've called WEBRA in Austria, they told me normal running temp. is 120-135° Celcius ( don't forget it's a high power engine for .90 cu, not a ZENOAH with low ratio power/cu )

SUCH RUNNING TEMPERATURE IS NORMAL !

Carburation problems should be solved buy using WEBRA gas pump and fine tuning: gas engine are a lot more sensible than glow !
The 90 P5Hi is a compétition engine, carb system works like an injection system without automatic regulation ( the carb is the same than glow version), it works very well on glow engine, but very difficult on gas ones.

The WEBRA is not a ZENOAH wich is an industrial engine developed for garden machine applications.
The zen is much more easier to run for these reasons, heavy weight, standard materials, few power regardind cu ....

It's a question of philosophy, I wil never put a garden machine engine on my Sylphide !!

I think carb problems can be solved on the WEBRA by installing a WALBRO carb, even if power will be less, running should be much more easier.

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12-27-2008 01:21 PM  8 years agoPost 16
Fixit

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UK

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I've called WEBRA in Austria, they told me normal running temp. is 120-135°
What they say and what the engine does are totally different.
I wish you luck with this engine.

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12-28-2008 05:30 AM  8 years agoPost 17
SPITFIREMK117

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FRANCE

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Thank's FIXIT !
I will try to run this engine...
Best Regards

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