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Tony Clark TITAN ZG 62PCI?, no more, thanks!. - 12/13/2011 8:34 AM   
jescardin


 

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From: Talamanca de JaramaMadrid, SPAIN
Status: offline 		Dear friends, I am looking for help as I purchased a new Tony Clark prepared Zenoah ZG 62PCI and I am getting quite frustrated and dissapointed with it.

I first must explain that have already runned in it for more than 4 hours and made a pair of quite frustrating flights.

Trouble found?, well first of all is the engine inhability to run under 2.000rpm at idle and even not under 2.600 if tunned as suggested on the manual.

From the all the time I have devoted to the engine I have found that the carburator regulator metering lever, although adjusted as per the service manual, required to be readjusted so as to cancel a rpm oscilation at idle as well as an engine misfire and severe vibration if quickly cut the engine speed from full throttle to idle.

Now all that headache is over but whatever I try adjusting the carburator I find it impossible to get below 2.000rpm and so impossible to keep the airplane still in the ground.

Aside I have also noticed a quite rough run in the entire first 30% of throttle, something me together with more gas experienced club mates have corrected a bit with new carb adjustments but which not have totally dissapered.

We have checked everything we knew about: undesired air feedings, carburator regulator metering lever, carburator gaskets, carburator filter, positive pressure arround the carburator..............

I will much appreciate your help for if we are forgetting checking something and will be very gratefull to read about your experience with this engine as, at the moment, I do not find confident to rely on my ZG 62PCI for safe flying my models.

Best Regards,

Jesus Cardin



< Message edited by jescardin -- 1/23/2012 7:49 AM >

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RE: Tony Clark TITAN ZG 62PCI?, no more, thanks!. - 1/23/2012 8:01 AM   
jescardin


 

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From: Talamanca de JaramaMadrid, SPAIN
Status: offline 		Well, for me dealing with this engine has proved totally frustrating and have given up on it!.

After accepting just imposibble to get an idle below 2K rpm and geting correct -but not perfect- ground running, yesterday I made some flights to my TITAN ZG 62PCI powered 90" Yak 54 only to achieve 3 dead sticks from 5 flights.

Now the engine cleanly quite in flight without any warning from just 3 to 10 minutes after taking off and in any flight attitude: one ocasion while on straight inverted flight and two others in plain level normal passes.

So I have got the bad feeling that I am risking a very nice model with this totally frustrating and unreliable engine and have decided to switch to a cheaper DLE or JBA 50cc chenese engine as they are succesfully flown by so many modellers while I have been unable to find just anyone with some experience related to the TITAN ZG 62PCI, even here in RC Universe.

Best Regards,

Jesus Cardin

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RE: Tony Clark TITAN ZG 62PCI?, no more, thanks!. - 1/23/2012 11:21 AM   
Tony Hallo


 

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From: Springdale, PA, USA
Status: offline 		Sound like a rich mixture, I would open both the LS and HS 2 turns, start engine and adjust trim to the lowest possible speed and begin leaning the LS screw, as the engine speed increases, lower trim.  At some point the speed will decrease when th e screw is turned in, open the the screw back to point where the maximum speed was attained, then a little more, 1/16th of a turn.  Now open the throttle to full and adjust the HS for maximum speed then open the screw the same 1/16th of turn, you're looking for 100 to 200 drop from the maximum.  Now set the idle trim to 1800-2000 rpm and check the acceleration, the engine should take the throttle, if not open the LS 1/16 at time and re-test.  Go back and check the HS, go fly.  This all assumes your timing is set correctly. 

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RE: Tony Clark TITAN ZG 62PCI?, no more, thanks!. - 1/23/2012 4:47 PM  1 votes
Antique



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From: Somewhere, DC, USA
Status: offline 		First thing, get rid of the Falkon ignition..
Get an RC EXL ignition and time it at 28 degrees BTDC
Go fly....

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RE: Tony Clark TITAN ZG 62PCI?, no more, thanks!. - 1/23/2012 4:56 PM   
captinjohn


 

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quote:

ORIGINAL: Antique

First thing, get rid of the Falkon ignition..
Get an RC EXL ignition and time it at 28 degrees BTDC
Go fly....

Antique is right on.  In the meantime get the mixtures set right too at least test run it.  By the way, you have a top notch engine.  Sorry you are having problems adjusting....hang in there....you just may love it when you get thihgs right.   Capt,n

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RE: Tony Clark TITAN ZG 62PCI?, no more, thanks!. - 1/25/2012 8:06 AM   
jescardin


 

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From: Talamanca de JaramaMadrid, SPAIN
Status: offline 		Many thanks, folks for your support and suggestions!.

Tony your explained procedure was one I tried, although not as per the book as the carburator has front facing needles and it is neccesary to quit the engine before making any adjustment.

Regarding switching the ignition unit is something I am discussing with RC EXL man here in Spain, Manuel Pascual who probably will also check the engine for if there is any fault with it.

Best Regards,

Jesus Cardin

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RE: Tony Clark TITAN ZG 62PCI?, no more, thanks!. - 1/25/2012 12:58 PM   
captinjohn


 

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From: Hesperia Michigan, MI, USA
Status: offline 		Manuel Pascual is very good with engines and ignition systems.  You should have a super running good  engine when done.  I am confident you will like that engine very much.   Hang in there.   Best Regards,  Capt,n

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RE: Tony Clark TITAN ZG 62PCI?, no more, thanks!. - 1/29/2012 12:21 AM   
karolh


 

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Status: offline 		Just keep us posted on how it all turns out.

Karol

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RE: Tony Clark TITAN ZG 62PCI?, no more, thanks!. - 2/7/2012 12:14 PM   
jescardin


 

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From: Talamanca de JaramaMadrid, SPAIN
Status: offline 		We have rigid mounted the engine now (it was originally supported by rubber mounts) as well as limited the cowl airflow epoxying a disc on the front so as to limit in the air intake.

We are just waiting for reasonable weather so as to try running and readjusting the engine again.

If results are not as expected, I will pass the engine to M. Pascual so as to be checked and the ignition system substitued.

Will post photos and results from the tests.

Best Regards,

Jesus Cardin

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RE: Tony Clark TITAN ZG 62PCI?, no more, thanks!. - 2/19/2012 7:35 PM   
jescardin


 

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From: Talamanca de JaramaMadrid, SPAIN
Status: offline 		Today we have tested the cures proposed in my previous post as well as the carburetor presure reference hole was modified to take air from inside the fuselage and I must admit that .....................we are in the way of solving the troubles!. Today we flew three 10-12 minutes flights with total success!.


We now get a reliable idle of 1.200 rpm although for security we trimed it up to 1.600-1.800 rpm and now the model keep stoped in the ground!. Then the engine throttles up very cleanly although we think we may get it a little bit better.

Then we have lost a bit on the high end. While the engine originally produced 6.400 rpm now we are unable of getting more than 6.000 - 6-200 rpm that are more than enough power for our Yak 54 and that we give well as lost rpm seeing the other benefits.
So suming up our discoveries:

1.- NEVER soft mount your large gas engines unless you have time and sources for getting involved in a lengthy and costly development. Go simple and rigid mount you engine!.

2.- If your model is one with a large round cowl, do not allow air entry free all over de cowl diameter. Produce a front sheet glued to the cowl with an opening just to let fresh air enter in front of the cylinder and then, produce exit holes about 3 times the surface of the inlet opening.

3.- For models described in the previous point as well as those with cavernous cowls, solder a tube to the carburetor presure reference hole and plug a Tygon tube inside the fuselage for avoiding presurizing the carburetor operation.

For us the way to follow is clear and will mount the purchased ZDZ 65 to a new Zero following these guidelines.

Many thanks for your support and suggestions.

Best Regards,

Jesus Cardin

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