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HelicopterEngines Plugs Mufflers Fuel › Tuned pipe flooding
12-03-2005 09:43 AM  12 years agoPost 1
spike2450

rrNovice

cornwall, england

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Hi all
I've recently purchased a second hand freya with os 70, and an extra long tuned pipe, checked needle settings before starting and the guy had the main needle about 1/4 turn open only, i reset to factory settings and the back pressure from the pipe seems to be pushing way to much fuel through and flooding the engine, (explains the 1/4 needle setting when he's tried to get it to run), i replaced with a standard style hatori 625-60 and its fine. i can't find the exact model of pipe anywhere but it's a extra long straight pipe that is about 41cm long and similar to a Hatori #650. Any ideas for the flooding??

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12-03-2005 10:38 AM  12 years agoPost 2
Dr Lodge

rrElite Veteran

Guildford, Surrey - UK

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Is it an Hatori 700 pipe? The back pressure shouldn't be that much, seems wierd to me.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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12-03-2005 01:55 PM  12 years agoPost 3
crowfly

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Pleasant View, TN U.S.A.

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See if the pipe is clogged up with something.

If God had meant for man to fly, he would have given him more money

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12-03-2005 11:49 PM  12 years agoPost 4
spike2450

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cornwall, england

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hi
thanks for the replies, cleaned the long tuned pipe all seems fine, started and ran fine for a short time, settings os70 1-1/4 main 1 mid and middle on mixture screw. After about 4 mins at idle engine cut, opened the back plate and out poured thick unburnt oil from the fuel which was sitting around the crank!!! there was loads of it. It's must be either the exhaust back pressure to high or a problem with the carb/engine. i've been flying for a number of years, previously planks ---( before i saw the light) and i've never come across this before. I'm using ripmax team fuel which i have used previously on my concept 60 without problems!! I couldn't use my other exhaust in the end as the nipple is on the wrong side. Any ideas would be great.

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12-04-2005 02:37 PM  12 years agoPost 5
crowfly

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Pleasant View, TN U.S.A.

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Is your exhaust outlet too high??? You may not be able to allow it to idle for extended periods. Also when you "park" your heli, If it has a high exh. outlet, you may have to position it where it will drain the oil out of the pipe, not back into the engine. When it's running, It's coating the inside of the pipe with raw oil. When you shut it off, the oil is draining back into the engine through the exhaust port.

If God had meant for man to fly, he would have given him more money

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12-04-2005 03:25 PM  12 years agoPost 6
spike2450

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cornwall, england

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Hi
the outlet is high, however i,ve just used the hatori 625 and run the engine and it seems fine now, when the engine was running with the tuned pipe it must have had to much back pressure and was forcing the fuel through to fast, What is the best method of cleaning inside the exhaust?
However the os70 engine/freya makes a strange noise it's as if the front/rear bearings have gone but the noise seems to be coming from the fan area i've read all other posts and it seems as if its accepted to be noisy but to be honest it's doing my head in, i'll give it it's first flight and see if anything fails (lucky that i've just cracked autos).

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12-04-2005 03:52 PM  12 years agoPost 7
crowfly

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Pleasant View, TN U.S.A.

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The best method I know of for cleaning the exhaust is to let it simmer all night in a crock pot full of ethelyne-glycol antifreeze.

If God had meant for man to fly, he would have given him more money

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12-04-2005 10:26 PM  12 years agoPost 8
spike2450

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cornwall, england

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Hi
Couldn't handle not knowing in the end and stripped the engine and it turns out to be the rear bearing which was corroded and running noisy.
are ceramic bearings any better?

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12-06-2005 06:17 PM  12 years agoPost 9
crowfly

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Pleasant View, TN U.S.A.

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Ceramics are better & here's some good ones at a good price.

http://www.mcintoshcentral.com/rc-b...2f21ad47b2bc909

If God had meant for man to fly, he would have given him more money

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HelicopterEngines Plugs Mufflers Fuel › Tuned pipe flooding
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