ZDZ80 failure mode!!!
08-01-2005, 09:39 PM
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ZDZ80 failure mode!!!
This was on a fellows Corsair at full throttle. Stopped turning so suddenly we all jumped.
I would guess that the choke lever failed as 1. its thin and 2. I may have been overdriven by the choke servo.
For those that cant see it ..the choke plate came off and went thru the rotary valve and the whole thing split while trying to digest the thing.
I would guess that the choke lever failed as 1. its thin and 2. I may have been overdriven by the choke servo.
For those that cant see it ..the choke plate came off and went thru the rotary valve and the whole thing split while trying to digest the thing.
08-01-2005, 10:16 PM
#2
RE: ZDZ80 failure mode!!!
looks like a Bing carb - made by Bing -not by ZDZ
also Bing has not been std carb for some time.
was choke plate ever removed?
Never saw this happen before.
It is not a ZDZ failure .
also Bing has not been std carb for some time.
was choke plate ever removed?
Never saw this happen before.
It is not a ZDZ failure .
08-02-2005, 01:33 AM
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RE: ZDZ80 failure mode!!!
The choke valve, is/was too big to get sucked past the carb venturi, so There is no way it went through the engine, only the bolt holding it went through, not that this helps you but Just pointing that out
08-02-2005, 05:32 AM
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RE: ZDZ80 failure mode!!!
ORIGINAL: Crusty
The choke valve, is/was too big to get sucked past the carb venturi, so There is no way it went through the engine, only the bolt holding it went through, not that this helps you but Just pointing that out
The choke valve, is/was too big to get sucked past the carb venturi, so There is no way it went through the engine, only the bolt holding it went through, not that this helps you but Just pointing that out
08-02-2005, 05:43 AM
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RE: ZDZ80 failure mode!!!
Mr Hansen What do you mean by "looks like a Bing carb - made by Bing -not by ZDZ
also Bing has not been std carb for some time."
I just got my zdz 80 in from RCS and it has a bing carb on it, should I contact them about getting a zdz replacement or will this carb run fine?
also Bing has not been std carb for some time."
I just got my zdz 80 in from RCS and it has a bing carb on it, should I contact them about getting a zdz replacement or will this carb run fine?
08-02-2005, 07:46 AM
#8
RE: ZDZ80 failure mode!!!
Nothing to do with you engine coming apart but...
Can you tell use what the pitting is around the exaust
port is from?
Can you tell use what the pitting is around the exaust
port is from?
ORIGINAL: andyt
This was on a fellows Corsair at full throttle. Stopped turning so suddenly we all jumped.
I would guess that the choke lever failed as 1. its thin and 2. I may have been overdriven by the choke servo.
For those that cant see it ..the choke plate came off and went thru the rotary valve and the whole thing split while trying to digest the thing.
This was on a fellows Corsair at full throttle. Stopped turning so suddenly we all jumped.
I would guess that the choke lever failed as 1. its thin and 2. I may have been overdriven by the choke servo.
For those that cant see it ..the choke plate came off and went thru the rotary valve and the whole thing split while trying to digest the thing.
08-02-2005, 08:45 AM
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RE: ZDZ80 failure mode!!!
There seems to be a shortage of parts with ZDZ... I'm betting they're throwing whatever they can find on their motors.
I've heard of the carb screw coming loose several times before... a least a couple on flying cirkus... it seems to be the ZDZ-80's "Jesus Bolt". I'm going to wick some green locktite into that screw to keep mine from looking like yours.
I've heard of the carb screw coming loose several times before... a least a couple on flying cirkus... it seems to be the ZDZ-80's "Jesus Bolt". I'm going to wick some green locktite into that screw to keep mine from looking like yours.
08-02-2005, 09:40 AM
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RE: ZDZ80 failure mode!!!
Here is a stupid question, but could this be warrantied by RCshowcase since it was a mechanical/workmanship problem and not a operator error,,,???
08-02-2005, 09:48 AM
#11
RE: ZDZ80 failure mode!!!
The carbs used on the ZDZ's are now Walbros - from RCShowcase .
Also - the carbs used by everyone are typically unmodified -except for throttle arms
The choking plate and the throttle plates are peaned and or re loctited as original - I have never seen otherwise.
Also - the carbs used by everyone are typically unmodified -except for throttle arms
The choking plate and the throttle plates are peaned and or re loctited as original - I have never seen otherwise.
08-03-2005, 06:47 PM
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RE: ZDZ80 failure mode!!!
Dick Ive owned a few ZDZs and Im not knocking them, in fact this could happen to any of them.
It was a Bing and the motor has been around for at least 3yrs that I know of.
Its hard to see but the screw fell out because the part it screws into failed, its at this point that its at its thinest ( choke plate shaft).
The choke plate was inside the crankcase when the plane was landed ( safely) so theres no way of knowing although it didnt look eaten up apart from a small nick.
Hi temp rtv is the only thing in contact with the exhaust outlet and I belive Donny was running Klotz modelube in it.
I dont think its a RC Showcase problem more like a weak part on the Bing agravated by possibly a servo overdriving it.
Loctite aint gonna fix the broken shaft so your screw is still going to fall out if your shaft breaks.
Happy worrying...he he he!!
It was a Bing and the motor has been around for at least 3yrs that I know of.
Its hard to see but the screw fell out because the part it screws into failed, its at this point that its at its thinest ( choke plate shaft).
The choke plate was inside the crankcase when the plane was landed ( safely) so theres no way of knowing although it didnt look eaten up apart from a small nick.
Hi temp rtv is the only thing in contact with the exhaust outlet and I belive Donny was running Klotz modelube in it.
I dont think its a RC Showcase problem more like a weak part on the Bing agravated by possibly a servo overdriving it.
Loctite aint gonna fix the broken shaft so your screw is still going to fall out if your shaft breaks.
Happy worrying...he he he!!
08-03-2005, 07:10 PM
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RE: ZDZ80 failure mode!!!
ORIGINAL: andyt
Dick Ive owned a few ZDZs and Im not knocking them, in fact this could happen to any of them.
It was a Bing and the motor has been around for at least 3yrs that I know of.
Its hard to see but the screw fell out because the part it screws into failed, its at this point that its at its thinest ( choke plate shaft).
The choke plate was inside the crankcase when the plane was landed ( safely) so theres no way of knowing although it didnt look eaten up apart from a small nick.
Hi temp rtv is the only thing in contact with the exhaust outlet and I belive Donny was running Klotz modelube in it.
I dont think its a RC Showcase problem more like a weak part on the Bing agravated by possibly a servo overdriving it.
Loctite aint gonna fix the broken shaft so your screw is still going to fall out if your shaft breaks.
Happy worrying...he he he!!
Dick Ive owned a few ZDZs and Im not knocking them, in fact this could happen to any of them.
It was a Bing and the motor has been around for at least 3yrs that I know of.
Its hard to see but the screw fell out because the part it screws into failed, its at this point that its at its thinest ( choke plate shaft).
The choke plate was inside the crankcase when the plane was landed ( safely) so theres no way of knowing although it didnt look eaten up apart from a small nick.
Hi temp rtv is the only thing in contact with the exhaust outlet and I belive Donny was running Klotz modelube in it.
I dont think its a RC Showcase problem more like a weak part on the Bing agravated by possibly a servo overdriving it.
Loctite aint gonna fix the broken shaft so your screw is still going to fall out if your shaft breaks.
Happy worrying...he he he!!
Man, that is some nasty damage. Sorry it happened. $#!7 happens.
Safe Flying!
08-03-2005, 08:31 PM
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RE: ZDZ80 failure mode!!!
Sorry bout the engine. The pitting on the exhaust outlet is from the muffler getting loose and hammering the aluminum. There's been some wild theories thrown around on RCU about RTV or exhaust gas eating the aluminum - just so much doodoo. Perhaps excess vibration also caused the choke rod to crack. Anything unusual about the way the engine was mounted to the plane?
08-04-2005, 04:30 PM
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RE: ZDZ80 failure mode!!!
I'm obviously missing something here....have you got a picture of the choke valve remains?, I am totally baffled as to how it could get in there, through a seemingly undamaged venturi and throttle valve
08-04-2005, 08:02 PM
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RE: ZDZ80 failure mode!!!
Since the choke had a servo connected, I assume that you removed the ball and spring holding the detent in the choke shaft? To remove the ball and spring, you have to remove the choke shaft, butterfly and screw? Am I guessing wrong?
08-05-2005, 07:51 AM
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RE: ZDZ80 failure mode!!!
This ZDZ was not mine so I dont know Im posting for info only. It may pay for some people to check their setups after a period of time as the results of the shaft breaking are not to pretty, although they are usually well hidden inside cowls.
I doubt if there are many that remove the ball and spring. Plus this engine had been in service for 3 + years run every weekend.
I dont think if it was loose then it would have made it so long .
Metal fatigue caused by maybe the servo or vibration?.
I doubt if there are many that remove the ball and spring. Plus this engine had been in service for 3 + years run every weekend.
I dont think if it was loose then it would have made it so long .
Metal fatigue caused by maybe the servo or vibration?.
08-13-2005, 11:19 PM
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RE: ZDZ80 failure mode!!!
I never had to remove either from the engine to get the throttle or the choke arms on.
I have a bing on engine flawless.Anything can fail and probably will.I do run loctite on mine
And check it and relocite it every month.The engine hits very hard and will tear up all kinds of stuff.
I have a bing on engine flawless.Anything can fail and probably will.I do run loctite on mine
And check it and relocite it every month.The engine hits very hard and will tear up all kinds of stuff.
06-03-2006, 08:54 AM
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RE: ZDZ80 failure mode!!!
ORIGINAL: andyt
This was on a fellows Corsair at full throttle. Stopped turning so suddenly we all jumped.
This was on a fellows Corsair at full throttle. Stopped turning so suddenly we all jumped.
Bobby
