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HomeAircraftHelicopterGasser Model RC HelicoptersOther › DIAPHRAGM Maintenance...
03-30-2009 05:59 PM  9 years agoPost 41
4 stroke flyer

rrApprentice

Dowagiac,MI

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As for your octane, I have and know many other gasser heli owners that have experimented with the diferent actane rating gas available. The best one we have found is 87 octane.

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04-05-2009 07:17 PM  9 years agoPost 42
Fixit

rrElite Veteran

UK

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I was amazed last week to find the diaphragm on my 600 gasser had perished after only a gallon and a half of fuel.

The heli started to lean out and I checked the muffler, carb gaskets and fuel lines but still had the same problem, the gauze filter was clear so I pulled the pump diaphragm off and it was limp and distorted , I have another new 231 in the 700 I’m building so I swapped the diaphragm and its run fine this weekend, I cant believe this could happen after such a sort time but seeing is believing.
Well like I said last week after swapping the diaphragm and the prime arrangement the heli flew fine last week but after standing full of fuel for a week the same problem has reoccurred the prime bulb just wouldn’t pump fuel again this week and the diaphragm looks well distorted, booth this engines came from the same source and are literally weeks old and I’m now beginning to think the diaphragms are from a bad batch, surely these are designed to stand in fuel and should last years not weeks.

I only like to fly gassed up

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04-05-2009 07:41 PM  9 years agoPost 43
copperclad

rrElite Veteran

NY

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hi
here in the states they have started to add a lot of alcohol to the fuel , i wonder if it could be attacking the diaphram , just a thought

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04-05-2009 07:48 PM  9 years agoPost 44
JuanRodriguez

rrProfessor

The Villages, Florida

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^^^

Good point, Dana....... what are we up to locally, about 20 % Ethanol ??

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04-05-2009 08:05 PM  9 years agoPost 45
copperclad

rrElite Veteran

NY

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hi Juan
they relaxed the regulations after Katrina , so it's anybody's guess

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04-05-2009 09:37 PM  9 years agoPost 46
Fixit

rrElite Veteran

UK

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here in the states they have started to add a lot of alcohol to the fuel , i wonder if it could be attacking the diaphram , just a thought
Hi, I wouldn’t know about that but if that’s the case then all the guys using petrol power tools will be pulling there hair very soon, I guess I will have to ring the supplier on Monday and see if he’s had any more complaints about them.

I only like to fly gassed up

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04-05-2009 09:51 PM  9 years agoPost 47
Stall_Warning

rrApprentice

NE, Pa. - USA

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A while a go I was reading up on Phase Separation.

They put ethanol-gas blend in boats and they got towed back to
the shore. The ethanol would soak up the water that you normally
find in fiberglass boat tanks. Once the ethanol became saturated
and could not hold any more water, you had phase separation.
The water saturated ethanol would separate from the gasoline and
go to the bottom. If it got into the engine, you got towed.
There is no additive to undo the separation.

So I was thinking, what if you could use this to separate
ethanol from the gasoline? We still can get 100% gas here.
But that may change.

I haven't found anything in my search saying it could be done.
To get the boat running again, they put a tube to the bottom
of the tank to remove the alcolol, so maybe it's possible.

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04-06-2009 05:56 PM  9 years agoPost 48
AceBird

rrElite Veteran

Utica, NY USA

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surely these are designed to stand in fuel and should last years not weeks.
Are you sure it is the diaphragm and not the flapper valves?

Ace
What could be more fun?

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04-06-2009 06:18 PM  9 years agoPost 49
Fixit

rrElite Veteran

UK

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Are you sure it is the diaphragm and not the flapper valves?
Well I can soon swap them out and see what happens but don’t forget this is a new engine with 1 ½ gallons of fuel through it.

I only like to fly gassed up

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