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Old 06-28-2004, 12:14 PM   #1
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ZDZ tuning

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Hi folks,

Just wondering what RPM I should be aiming for at idle and full throttle on my ZDZ 40? Right now its running a 20x10 Menz and gets about 6500 on the high, with idle around 2000. Being the only ZDZ owner in my club and general area, I have no other point of reference for what is considered normal. The thing flies fine with lots of power, just curious what others results are with this engine. I've been flying it for a few seasons now and have probably 5 - 6 gallons though it (guessing).

It's just an airplane...

Jamie Morgan
Portugal Cove, NL
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Old 06-28-2004, 01:14 PM   #2
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flight performance depends to a great extent on what model you have the engine installed in.
Your rpm figures are OK,although some would prop for a little higher RPM on the top end but not much more is ideal for ZDZ IMO,since they do their best work when used as torquers.
That is a good size Menz I think too since these props are more efficient than most and will run at a lower RPM than say a Zinger.
For what its worth I broke my ZDZ 60cc in on petro based oil at 40/1 using 22x10 and now 24x10 props and turning right around 7000 rpm.By glow standards four or five gallons is a good break in period,but for a built for purpose gasser like the ZDZ you probably arent even close to being broken in yet depending on how lean your mixture,type of oil and ratio oil to gas.
If it was me and I was satisfied with the in air performance I would put a lot more time on the engine before I worried too much about RPM results.
The main thing at this point is to make sure the engine is developing enough heat to continue the break in process but not to go too lean and overheat and damage the piston or walls.
Your best bet is to use a good tach to peak the top end then back it off a couple of 100 RPMs.
There are lots of savvy gas owners around these days,and hence lots of strong opinions,but the above is how I see things..........
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Old 06-28-2004, 02:58 PM   #3
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My zdz 40 rear exhast is turning 7300 rpm on a 20/10 pro zinger . If I had to guess, a menz would prob suck it down to 7000 . I have not quite 5 gallons though my 40 . The 40 really came alive after about 3 gallons and then I opened the exhast a bit and that helped also .

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Old 06-28-2004, 03:48 PM   #4
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Well i think i have around almost 2 gallons on my zdz 40 and i tached it with a 20-10 zinner and i was onley getting around 6400-6500 rpm. But i know it is no where near broke in yet.
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Old 06-28-2004, 04:57 PM   #5
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ZDZ Tuning

Since I have been playing with my Ryobi (which people say are getting around 72-7400 rpm with an 18-8 ) I would think that your ZDZ should be closer in value to what others are getting ie; 7000-7200 with a 20-10. I have one coming very soon and hope that it is a strong runner

Here's my story. I stated with an 18-8 and got around 5200 rpm to start. Pure crap. So I changed props and got to 6100 rpm..better but still crappy. So I played with the timing..got up to 6800 rpm..better but still a little crappy. So advanced the timing to what looks like 34 degrees tdc (actually works out to around 31) and tweaked the needle valve...now gettting 7100 rpm...no more crap It now starts and idles perfectly, has tons of pull, and I think that with a few more prop experiments, better fuel (using my weedie mix which is whatever ) I will have a wonderful engine in my hands

The moral of this story is..don't settle for crap...experiment until your manure pile turns to gold
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Old 06-30-2004, 01:34 PM   #6
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ZDZ is in!

Well I got my ZDZ 40 rv and it looks pretty in it's red standoffs I will be putting it in my H9 edge this week and give 'er a go next week sometime (wedding this weekend).
Thanks Roger for your prompt service!

PS What's with the green paint?
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Old 07-02-2004, 11:05 AM   #7
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zdz 40

The rpm will depend ALOT on the muffler setup.

My Zdz 40 on Bisson pitts muffler would only turn a Menz 20x10 at 6100 rpm so, your 6500 looks pretty good-again depending on muffler. The Menz was too much load for mine.

It happily turned a Mejzlik 20x10 at 7200 rpm.

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Old 07-29-2004, 10:43 PM   #8
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zdz rpm

My ZDZ 40 with a 20-10 Zinger is turning 6400 with the Bisson pitts muffler. It is fairly new and came alive after a few flights, but I never fly full throttle except vertically ... the Edge gets going way too fast
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Old 08-05-2004, 01:42 PM   #9
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ZDZ tuning

I have two ZDZ40 turning 22x8 menz at 65 and 6600 H is at 1-1/2 and L is at 1-1/4, both of them are runng great.
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