Hey guys, new to gas and have two flights on my DA50. The engine has about 5 gallons through it, and I am running 50 :1 Amsoil in it right now. It will swing a Menz 22X10 @ 6250 and a MSC 22X8 at 6900. This is with a Bisson pitts.

Do these figures seem about right?

Also how much would I gain by going with a Stock muffler? And lastly what could I expect a Mejzlick 23X8 to turn at?

Thanks Alot!!

If you haven't cut the pinched off of the tips of the Bisson pipes already, do so. That will perk things up a bit. The numbers you provide with the 22-10 are really low. The MSC is pretty close to what you should see, perhaps 100-200 rpm low.

Overall, the numbers given make it sound like the engine may be on either side of the correct mixture settings. It's definately not whre they should be. Then again, I don't have a clue to your altitude above sea level.

Question, is there a possibility that the Menz 22-10 is actually the one with the higher rpm?

My buddy's DA50 with Slimline pitts turns a BME 22x10 at 6400 RPM near sea level. Mine turns a Bambula 22x8 at 6900 near sea level. The MSC and Bambula are around the same static load from what I've seen on other people's numbers. Your Menz looks a little low. I've heard the Bisson is a little more restrictive than the Slimline. I'd also cut the small ends off the stacks, easy 200-300 gain.

The stock DA muffler is lighter than the slimline not sure about the Bisson. Your numbers would go way up with stock DA but so would the noise. Also looks pretty bad when cut up the left side of your engine cowling.

23x8 Mejzlik is around 6600-6700 if I remember right. 22x8 is around 7200-7300.

With 2 gallons thru mine on a KS pipe she is turning 7200 with a 22X8 NX prop.Plan to go to a 23X8 NX prop when she gets a few more gallons thru her.

All the rpm numbers stated above are starting to reflect something. It seems that they are in line with most of the other 50cc engines. When I was doing some prop testing with a Brison 3.2 at an elevation of about 800ft msl I was getting 7,300 with a Zinger 22-8, 7,100 with a Mejzlik 22-10, and 6,900 with an MSC 22-8. Hmmm...

DA50-R (newest version)
Slimline wraparound Pitts
NX 22x8
89 octane
Amsoil 100:1 mixed at 80:1
7200RPM (7260 peak!)
Sea-level (FL) temp mid 60's with moderate humidity
I've got about 7-8 gallons through it.

I'm pretty much at sea level( maybe 50ft ). And yes the Menz 22-10 was swinging it at 6250... the MSC was 6900. So I CUT the tips off the muffler?? I'll see if I have a picture for you guys to let me know if this has already been done( it may have been ) I didn't look and am away at school so I can't go check.

Also would I have to cut the cowl up with the stock?? Does it stick out that far? Oh and noise is not an issue at my field. I'm tempted to see if I can get one.

Found a pic, let me know if you can tell if it has been cut.

Nope... about 800 ft too in Central ohio... 7500 MSC 22x8 adn 7150 NX 23x8... 600 rpm more is a whole buncha thrust...

rcflyer96's figures are pretty much in line on the Menz S 22x10. I tried one on my DA when I first got it and those are the numbers I got also. Just too much prop for it.[:@]

Wow those numbers are high, what engine are you talking about here?

my brison will swing a menz 22 x 8 at 7200 very strong engine for the price. i can swing a 23 x 8 mejzlik at 6300 to much load for the motor on a J & A peacekeeper. Power band is better in the 6500-7500 range.

Two different DA50R's ... tached with two tachs, just broke in and running 50:1 Belray.

These things are great runnin' powerful engines...

Im getting about 7100 R's with a NX 23-8 at sea level and I still need to lean it out some more

That's great news. I have one with 4 flights on it on my BME Edge. Looking forward to when it's broken in.

Guys are those reading with a stock muffler or with a BCM or Slimline??

Thanks..

My Brison 3.2 on a Bisson pitts swings a 22x10 Menz S at 6800 rpm.
2700 ft ASL.
Ditch those DA50s and get a Brison!!

Good Luck
John

Stock muffler here... the different Pitts out ther ewill reduce performance... some more than others.

I stick to the stock whenever I can for th weight and performance gain.

Guys... I simply wouldn't throw numbers out there for the sake of doing so. I try to tell it like it is.

Now I did have a DA50 without the carb block mod that got nearly 500 less RPM than my buddy, same prop (literally)... it also didn't have the properly hardened pin in the rod.

I sent it in for the free upgrades and haven't run it yet... soon I hope.

I was talking to Dave a couple days ago... he said that they were pushing the 6000 mark on # of DA50's out there. That's a ton.

stock muffler

Stock muffler on a DA-50R will give you 200 - 300 more rpm on the top end over the Slimline or Bisson pitts style...

Minimum... I did some tests and the stock Bisson robbed nearly 800 rpm! The Supersonic stole about 400-500... That IS significant. The Supersonic had straight exhaust pipes and the Bisson's were swaged down a it.

As many know, cutting them off will return a couple hundred rpm putting it back inthe range of the Supersonic... I haven't tested a slimline...

The sotck muffler is hard to hide and many cowls require some cutting on the side... but I'd rather see a little muffler and gain 400-500 rpm anyday...

With that said... if these other engines could use the DA stock muffler they would see an increase as well... most can't but the ZDZ can... same header pattern.

Thanks guys, looks like i'll try to find a stock exhaust. I too would rather have 200-400 more RPM, or whatever it will gain me, and have a to expose a bit of the muffler.

Thanks again!!

DA50-R (newest version)
Slimline wraparound Pitts
NX 22x8
89 octane
Amsoil 100:1 mixed at 80:1
7200RPM (7260 peak!)
Sea-level (FL) temp mid 60's with moderate humidity
I've got about 7-8 gallons through it.


ABOUT 89 OCTANE,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ALL YOU PUT THE SAME GAS????????? I PUT 95 ITS PRODUCE SOME DIFFERENCE?????

I HAVE A BRISSON 3.2.

I think it's generally recommended to run the lower octane gas.. something about it burns faster I think?

My fiddy turns a menz 22x10 at 7400. Why would someone want to ditch this for poky brison.

Kent

22-10 7400 ITS A DREAM..............
ON MINE 3.2 WITH 20/10 7200 RPM BUT WITH THE NEEDLE SO THIN,,,, I OPEN A LITTLE AND FLY WITH 6900RPM AND MY EXTRA HAVE A UNLIMITED VERTICAL