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Old 10-23-2019, 09:19 AM
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ever heard of a ZDZ 50cc engine?

I think i got it right, i know its 3 letters. my buddy has one on a Aeroworks Yak. i google and found nothing. its another plane he is thinking about getting back from guy he sold to just wondered if i be able find a carb for it. or anything i would need. or if end up having to stick a different engine on it.




Edit it was a ZDZ engine
I found the site. I thought i had looked before and couldn't find anything maybe I am wrong on the name i will have to double check.

https://zdzenginesusa.com/
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Old 10-23-2019, 09:28 AM
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I had a YDA 50, pretty good engine
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Old 10-23-2019, 02:31 PM
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Carb would be no problem,any other engine part may be one though.It's been a few years sense they were around.If all it needs is a carb then use it till it quits.Walbro WT201B or 918 would work,or any DLE55 carb.
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Old 10-24-2019, 08:02 AM
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I had a zdz 100NG twin, so I am not surprised that there may have been a 50.
What I remember about it is that it wore my shoulder out trying to start it.
They used a rotary valve instead of a reed valve, claimed it was better.
Maybe, maybe not, but it was a pain.
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Old 10-24-2019, 08:25 AM
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ZDZ is a Czech brand that been around a long time.. they used to be fairly popular 15-20 years ago when DA was not as dominant as they are now. They where originally imported by RC Showcase (Along with Moki, MVVS, and a few others).

RCShowcase folded and ZDZ USA is the importer now but I haven't seen one around in a while. ZDZs are a unique design in that they dont use reeds (DA,3W, etc) OR piston porting (Zenoahs)... rather they use a rotary disk valve on the back of the crank to let the mix in from the carb. Conceptually this works similar to the hollow crank intake of a glow engine. ZDZ had a reputation for being more powerful in a given size class than reed engines, but where notoriously hard to start and a little trickier to tune.

I was thinking of trying a ZDZ50 in 2005 before I got my first DA but they where always out of stock and never got the chance. The 50 has been replaced by a 56 in current production, you could probably call them and get the manual for that:


https://zdzenginesusa.com/product/zdz-56rv-j
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Old 10-24-2019, 08:29 AM
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Yeah there was at one time ZDZ50 . Carb numbers I gave you still will work on it.You will have to do a search on starting these engines.They don't start like your normal reed engine.
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Old 10-24-2019, 09:11 AM
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They are good quality engines but definitely have to follow the proper start procedure or you'll be trying all day. What I hated was that dang spark plug collar Gizmo...had to have a special socket to fit inside...some may like the way the Ign locked down but personally I hate it.
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Old 10-24-2019, 09:56 AM
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Yeah same hear,MVVS had the same ignition and sparkplug boot.Had to be secured the cap to the plug with a set screw,it always loosen up and fell off while flying.RCEXL ignition took care of that.
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Old 10-24-2019, 11:48 AM
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Thanks for all of the info everyone,.. Were suppose to check out the plane sometime between now and Christmas.
he thinks the engines he always had are the best and doesn't trust any of the DLE or other newer ones out there.
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Old 10-24-2019, 02:26 PM
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Hey ZDZ's are a strong running high rpm engine's,they were designed to run on pipes.You just have to get the stating sequence down.
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Old 10-24-2019, 02:40 PM
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On the old ZDZ engines, the funky plug cap and special plugs can be replaced with normal ones as used these days. Probably just easier to replace the whole ignition system. I believe those old plugs were nothing more than a CM-6 plug with most of the top connector cut off. I passed on several ZDZ engines a few years back just because of that goofy plug cap system. They certainly ran well though I'm not sure what the parts availability would be these days for the older engines.
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Old 10-24-2019, 02:53 PM
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Here's a pic of my 50NG ZDZ, great engines but will heat up pretty quickly if you think you're going to do high alpha 3D with it, it's probably not the engine you want.

If you have ANY ignition issues, just get rid of the ZDZ unit and get one from CH Ignitions. In fact, getting one right off the bat may be a good idea. The ZDZ setup was kind of a pain and used a tapered thread for the spark plug, a weird cap and the top of the sparkplug was ground off to be shorter and flatter than stock. There was a coiled spring inside the cap that contacted this area of the sparkplug.

I think you can still get new ZDZ ignitions but they are close to $200 where the CH is in the $30 range. There is also an adapter setup available to put a conventional CM-6 sparkplug in the engine and the CH ignition has conventional sparkplug wire ends.

Also, should you find yourself in need of a muffler or header, anything made for a DA-50 will fit the ZDZ-50 perfectly.
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Old 11-03-2019, 11:21 PM
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I've ran almost all of their engines when I was in my heyday of flying. 40, 50, 60, 80, 112, 180.

They LOVE to be on pipes but made great power on ks cans.

From cold they had an 8-8-1 sequence

Ignition off, full choke flip 8, choke off, flip 8, ignition on, choke off flip once and shes running. But if your needles were good it was a out 5-5-1 on a good day.
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Old 11-08-2019, 11:28 AM
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Quote:
Originally Posted by racelikustolit3k View Post
I've ran almost all of their engines when I was in my heyday of flying. 40, 50, 60, 80, 112, 180.

They LOVE to be on pipes but made great power on ks cans.

From cold they had an 8-8-1 sequence

Ignition off, full choke flip 8, choke off, flip 8, ignition on, choke off flip once and shes running. But if your needles were good it was a out 5-5-1 on a good day.

Wow , thanks for the info, Not looked at the plane yet, one day soon maybe. The guy been busy with work. I am hoping the covering is in better shape on the yak and maybe i can let a guy have the bipe for a bit to re cover while i fly the yak. its already feeling like winter here we skipped Fall like normal in GA so not sure how much flying i will get in the rest of this year.
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