SpinnerRow

Nope, but I'll have to put my new HD camera to use tonight. That 9x10 is sick. It made me take a step back from the test stand when it went on the pipe. I can tell I'm in love with this engine already and I hope it stays together long enough to get past the honeymoon.

Iflyglow

My Feedback: (79)

My only concern was with the cheap steal retained rear bearing and High Rpm. I switched mine out when I was massaging the inside.

freakingfast

My Feedback: (3)

It's sad that manufactures make a decent engine and stick cheap bearings in it. What did they save 25 cents their cost? When Evolution first came out with the 46 NT, they had bearings with plastic cages, then about a year later they switch to cheap steel cage bearings. Yeah, I noticed, and I noticed the shorter bearing life too...Horizon!

RC-Bearings

My Feedback: (1)

What size bearings ended up in your engine?

SpinnerRow

http://www.pspec.com/details.asp?ProdID=77&category=7

There is more bearing talk on the last two pages of this thread.

Iflyglow

My Feedback: (79)

Paul,
I have your 15X28X7 (6902) and .375x.875x.281 (R6-2RS) in mine. We will see how it works out.

airraptor

My Feedback: (66)

Why are you guys loading this engine down. It really like the rpm with the Jett muffler. It needs to be in the 16,500 and up on the rpm.

Ernie Misner

Maybe they just want to fly sport aerobatics.

Ernie

SpinnerRow

Yea, I have one on an Ultra Stick 40 with a pipe turning a 12x5 right at 15K that is a stupid amount of fun to fly.

One is on a Strega 40 turning a 10x8. This one is more speed oriented for sure but I have noise restrictions at my field and I need to keep it 15K or less. The 10x8 will put me right there (in cooler weather). The 9x10 is upper mid 15K range and I bet the 9x8 would get into the 16,500 range. But man, at close to 16K the last time I tested a 9x10, the sound was nuts. And I actually tried a 9x10 on the Strega and didn't like it. Virtually no climb out and the speed gain wasn't that great enough for me to "have to have" that prop on the plane.

SpinnerRow

APC 9x9
Omega Aero 15%
94 degrees and 70% humidity

I've also cleaned the ports up on mine a bit as well as replaced the bearings.

16,400rpm

Ernie Misner

Do you mean you've cleaned up the transfer area or did you get into the ports themselves where the chrome plating is?

Thanks,

Ernie

SpinnerRow

No chrome was harmed during this activity! I cleaned up the outside edges of the boost, transfer and intake ports. Did a bit more work on the intake port than the other two but generally cleaned them up a bit.

Dblex

My Feedback: (81)

Guys, I have put a hole in one piston and broken the crank on the other. Both only ran about 2 minutes and both blew on throttle up. Two turns out to start and running a 10x7 prop with the Jett muffler. Spinning both of them by hand felt really tight and just felt like there was metal on metal binding inside.

Any advice?

SpinnerRow

Yea, richen the mixture. Sounds WAY lean.

Dblex

My Feedback: (81)

So 2 turns as per the manual is too lean???? Where do you think I should start out at?

Thanks for the help guys!

SpinnerRow

The manual was written with the stock muffler in mind. If you are using the Jett muffler you will have to richen it way up. More power = more fuel required. I would richen it 3-4 turns out and then sneak up on the tune. That metal to metal grinding you feel on the new motor is just that. It is an ABC engine with a tapered bore. It is going to have a nasty pinch at the top of the stroke until you run it in some. If you are trying to start this on a cold day, warm the cylinder head with a heat gun on low to before the initial start. And use some fuel with castor oil in it.

By the way, an APC 10x8 is an ideal prop for this motor. I have two of them. One on a pipe and one on the Jett muffler. Very powerful motors. It loves the 10x8.

RC-Bearings

My Feedback: (1)

One other thing to think about. Running these engines much past their design RPMs will start to show any weaknesses. I would be tuning to run a larger prop at the same RPMs. You get much more pull by doing this and you keep the engine well within their operating range.

Pete Bergstrom

Please see message below - I had a computer glitch and sent this as an empty message.

Pete Bergstrom

Dblex, Sorry to hear about your issues. We have about a dozen of these engines running within our product development group in anything from Stiks to the Jackal and the Phoenix, mini-pipe setups and full blown tuned pipe setups and we have never had these issues before. Please return these engines directly to my attention so we can get to the bottom of this problem.

BTW - our Jackals run with the EVOM1 mini-pipe muffler at about 1-1/8 turns out from closed. That muffler tends to have a ton of muffler pressure and provides a lot of fuel to the engine so running at two turns out should have been very rich. If it is not I would look into the muffler pressure system between the muffler and the fuel tank.

Pete

SpinnerRow

I've put better bearings in both of mine.

I can interchange an APC 12x5, 11x6 and a 10x8 and get pretty much the same RPMs. It is all about your flying style. I don't like the large diameter short pitch props - too slow.

RC-Bearings

My Feedback: (1)

I was mostly speaking to the people who are trying to get more speed from a draggy airframe. Going to smaller diameter props is counter-productive in those cases.

freakingfast

My Feedback: (3)

Did you change the factory plug to the HAN3015 #9 Performance Plug or HAN3020 #3 Performance Plug that the manual calls for when you run the tuned muffler?

Is the fuel system plumed correctly, when empty, can you you blow from the carb line through the tank into the muffler without blockage?

I know the manual calls for Cool Power, but I'd like to see some castor oil as part of the fuels oil makeup especially during break-in.

When new, they do feel tight, primarily at the top of stroke. Don't turn it unnecessarily by hand.

The needle setting of two turns may be wrong when the tuned muffler is used, the setting is a starting point, not written in stone. You may need to start with more turns open to be safe.

Start it and get it up to speed temperature. Extended cold, low speed running when new could do harm.

They need to be ran-in rich with lots of smoke, wide open, about 1500-2000 rpm OFF PEAK RICH regardless of needle turn count. 10X7 should be OK for this.

The sound should be just inside the smooth two stroke scream and the engine should jump if you MOMENTARILY pinch the line. After running a few moments you should barely be able to hold your finger on the head. Run for two tanks like this and on the third tank start working it leaner, about 500 rpm off peak by the end of that tank. Go fly.

If you are not sure, get help. Don't kill another engine.

Have fun be safe & good luck.

Dblex

My Feedback: (81)

Actually, I was told 2 turns out to start is too rich for this set up. To start at 1.5 turns and that this motor/pipe Combo likes it leaned in around 1 and 1/8th turns. The 2 turns out apparently was flooding the motor and causing a backfire. The Jett apparently kicks out alot of muffler pressure wich I was told can flood this motor. This was from a Rep that I spoke with at Horizon.

Dblex

My Feedback: (81)

I just cant figure this out...

My Jett muffler doesnt seem to be getting enough pressure to tank as my motor gets super hott and loads up, but when I put the stock muffler, she runs smooth and cool....

What are your guys needles at on the high end??????????????? Im curious!!!!!!!

freakingfast

My Feedback: (3)

Can you blow through the fitting in the performance muffler? It wouldn't be the first time a muffler's fitting was blocked.