CRRC Pro GF26I

[gazzajp]

I run a apc 17X6 prop and I reakon it gives me the best all round performance. I get around 8800-9000rpm and it pulls my 11.2lb yak around no worries. Not real sure how much punch out from hover it has as I havn't really tested it properly. Ain't really ready for to much 3D action yet. The thing will pull vertical no probs. The one thing I don't like is the lowest stable idle at 2300-2400rpm. My plane moves around to fast during taxying.

I don't know if I'm way off the mark here, but those of you having running troubles using the NGK plug, just try put the torch one back in and see what happens. For some reason mine ran terrible with the NGK so I currently use the torch.

[ken crane]

	Quote: Originally Posted by JeffElecRC
	Update on my engine: I'm up to over 50 flights now. Best performance I'm getting is 7900 rpm on a 17x8 prop. Idle is around 2300-2400 rpm. I retarded the timing by moving the sensor towards the carb, but I cannot hand start it no matter how much I try. I prime flip 'till it fires, then choke off and flip a few more times, but best I get is a weak turnover. Anyway, I'm frustrated that I don't get the performance you guys get. Maybe I got a lemon. I think this engine is getting the boot after this season. It can't even pull a decent vertical with a 9lb 13oz aircraft. It's a dog compared the Evolution 26. Next, I will try a Brillelli 26.

without using a degree wheel your guessing on the timing. its only aprox 2-3degrees in the adjustment of the hall sensor. set it in the middle of the holes. i would try a 16x 8 prop on the motor. mine didnt perform well with the 17. it pulls hard at 7900 rpm with the 16x8. also i would look for a fuel restriction in the carb such as dirt in one of the jet holes (especialy under the main)take the carb off make sure the manifold isnt cracked around the mounting holes.also make sure you set the hi and low to exactly the 1 1/2 and 1 3/4 turns in the manual as this is the sweet spot.

[2robinhood]

	Quote: Originally Posted by gazzajp
	I run a apc 17X6 prop and I reakon it gives me the best all round performance. I get around 8800-9000rpm and it pulls my 11.2lb yak around no worries. Not real sure how much punch out from hover it has as I havn't really tested it properly. Ain't really ready for to much 3D action yet. The thing will pull vertical no probs.

That's what I use, the APC 17 X 6 and that's my best performance of my 11 lb. 2 oz. Seagull Laser. My idle is 2000 - 2100 rpm, and my top end is getting 9400 -9500 rpm on the ground. I wish I could get the idle to 1700 - 1800 rpm, but the 2000 rpm is bad. Here is a 45 second video of some top end numbers with the APC 17 X 6.

YouTube - CRRC GF26I with APC 17 X 6

[3Dguy]

When I switched carbs, it idles pretty steady @ 1900 on an APC 16 x 8.

[zool.on]

Hi,

I did not have a chance to fly today but I did get to test the engine some more. I am happy to say I think I found the ource of my problem. After securing the tank correctly I ran the engine and it seemed fine for about 20 minutes then it started to run strange and go lean again. Again I found air in the fuel line so much that the engine keept stopping. I found it was leaking around the tee and I am not sure how come it keeps taking about 20 minutes of run time or so for it to start to sucking air so bad. I removed the tee and the engine runs fine now. The tuning stays constant and I have 8600 on the high end and between 1800 and 1950 for the idle with SY 16x8 prop. I hope to get out tomorrow and see if it's ok when in the air. I will check and see if I can pick up a larger tee some place so I can use my fuel dot again.

[zool.on]

Here is a pic of the Funtana just have to finish up the cowl

[2robinhood]

I can't see anything from the picture, but you are using fuel line and fuel dot that are made for gasoline, right?
Any glow fuel line will swell three times larger then it's size and will not hold on any nipple or fitting.
Not saying that you are using the wrong line, but if it is glow fuel line after 20 minutes in gasoline it maybe begining to start swelling and causing your air leaks.

[JeffElecRC]

It's funny, no sooner do I get online and complain about my engine, two things happen. The engine I complain about gets better (accidentally) and the engine I compared it to got much much worse.

Since this thread is about the CRRC I go with that first: last few flights I noticed the engine was a bit noisier, I didn't think too much of it, but I did notice a jump in performance. Suddenly the verticals came alive, and surprise, I was able to hand-start it after about 10 prime flips it came alive in 3-4 flips.

Well if you haven't guessed yet, the reason it got noisier was that one of the two exhaust pipes on the wrap-around style muffler broke off! So that was it all along. The wrap around pitts I bought from Ray was too restrictive. The stock muffler wont fit in my cowling nicely.

I lost my tach, but when I get a new one I'll post new RPM numbers.

2robinhood: I notice in your video you have the wrap-around. Is that the same one from Ray @ paragon rc?

And for the Bad news: my Evo 26 died on me. I've been storing the plane on it's nose and apparantly that was enough to push the bearings back. The crank hit the crankcase cover in the back and made a mess and overheated and seized the engine. I think it's fixable. The cylinder and piston look fine and were not damaged, but I probably need to replace the bearings and rebuild it. Shucks!

[zool.on]

HI,

The fuel line is tygon so that should not be a problem. I did get to fly it today and the engine seems ok but I still have a leak some place. I removed the fuel dot tee and even my filter and ran a straight line and I am still sucking air some place. I am just going to get a new tank and start over. Still strange how it takes about 10 minutes or so before I get the air problem, I was able to fly it 4 times and it was great till it started sucking air.

[Wilki01]

	Quote: Originally Posted by zool.on
	HI, The fuel line is tygon so that should not be a problem. I did get to fly it today and the engine seems ok but I still have a leak some place. I removed the fuel dot tee and even my filter and ran a straight line and I am still sucking air some place. I am just going to get a new tank and start over. Still strange how it takes about 10 minutes or so before I get the air problem, I was able to fly it 4 times and it was great till it started sucking air.

On mine, I was chasing simliar problems. I found a leak in the fuel diaphram cover plate. There is a metal plug installed in mine, I could see daylight through it, I don't even know why it was drilled out. I sealed it up with epoxy till I find another coverplate. I also found the screen in the carb to be plugged from machined metal bits. I cleaned it out and ran a tank of fuel through the engine while running on the ground, it seemes to run better, when the weather clears I will try to fly it again and see if my midrange operation improves.

[3Dguy]

The pitts muffler does reduce the rrpms, but I dont think it's too restrictive. I'm using it on my engine, no problems.

[2robinhood]

	Quote: Originally Posted by JeffElecRC
	2robinhood: I notice in your video you have the wrap-around. Is that the same one from Ray @ paragon rc?

Yep It is a CRRC pro Pitts muffler that I got from Ray when I bought my engine.
I never tried the stock muffler, it is still new in the box.
I really can't complain about my RPM's 9400-9500 on a 17 X 6 isn't bad at all.
The SY ( carbon looking ) 16 X 8 is swinging at 8950 rpm.
I actually am selling off all of my stuff and getting another 100cc plane.
So I will have two 100cc and that's it.
Since I have had the big plane, I haven't touched the smaller stuff.