CRRC Pro GF26I

[rcign]

Fuel tubing size is one of the myths floating around on these forums..Large diameter fuel tubing is in no way needed on ANY gasser...Hayes molded neoprene tubing from Tower Hobbies will run ANY gasser now sold....The little hole in the carb at the tip of the inlet needle is less than .060 diameter...A garden hose connected to the carb won't pass any more fuel than the Hayes....If you need large diameter tubing you have a problem somewhere else.....
My test stand fuel tank has Hayes tubing hanging in the fuel 24-7...I can't remember the last time it was changed, it's still as flexible as when it was put in...It does not deteriorate in the gas sold here in Arizona....I run 3W 170s on the stand and have 0 fuel problems...

[zool.on]

Hi,

Thanks for the info. I don't think it is related to the size of the tubing as it is the same as my old Q52 and my CRRC45 that seem to run with no problems. I did find two problems that I hope will have solved the probelm but I have not had time to test it yet. I wanted to get flying with this engine fast so I got the Funtana used, I must say as well I do not want this to sound like a slag toword the person I got it from this was 100% my fault. After a closer look I found that the custom tank tray they had installed came lose. The tay is held in with two wood screws and one came out letting the tank move around a lot. I think this was causeing the fuel to foam and this is what was causing the bubles in the line and the cause of the lean running. I removed the tray at one point and I must have not put it back in correctly. The second problem I found was the fuel filter. I can't remember the make but it is not one of the DuBro ones I would nomaly use so I had a closer look at it and found it to not be all that tight. I did not notice this when I installed it. It has some sort of o-ring between the two halfs and I could turn it about half a turn tighter. I did ask when I got it if it was safe to use with gas and was told it was ok. I just hope it's not the o-ring swelling and shrinking from the gas. I hope to get out this weekend and see if this solves the problem.

As for the fuel mixture I had asked Ray if it was ok to break in at 30:1 and he said it would be fine. He just said to not run it that had at first so for the first hour I did not run over 5000 RPM for more then a few seconds mostly at about 2500 RPM on the second hour I ran it between 5000 and wide open but not wide open for longer then a minute and for my test flying I was at just over half for most of the flight. I will run at least 4 to 6 liters more through the 26 and 45 begore I go to 40:1 and then just check the plug at the end of each day to see how it looks to see if it is still a little rich or too lean.

edwal07 how do you find the performance with the chipmunk? A friend of mine has the same one and was looking for an engine so I told him about the CRRC26 and we were wondering how if flys with that engine?

[gazzajp]

Havn't been here for a while, thought I'd share my experiance with this engine.
The thing is awesome, a real screamer. Everything is stock, still running the torch plug too. Havn't had to touch the carb needles either. Funny thing I did try the NGK plug but it ran like crap? So the torch will do for now. It's a pitty some are having so much trouble with these engines, but thats how it is I guess. That's where these forums are so good to help.

[Noddy]

	Quote: Originally Posted by gazzajp
	Havn't been here for a while, thought I'd share my experiance with this engine. The thing is awesome, a real screamer. Everything is stock, still running the torch plug too. Havn't had to touch the carb needles either. Funny thing I did try the NGK plug but it ran like crap? So the torch will do for now. It's a pitty some are having so much trouble with these engines, but thats how it is I guess. That's where these forums are so good to help.

With you 100%. Mine has still only had 3/4 gallon of petrol through it and it runs like a dream. Like wise I have not touched the needles yet, it throttles great and pulls my Extra round the sky like a missile on a JXf 17x8 prop. I'm definately loving it.

[Wilki01]

I'm having a bit of trouble gettting my CRRC Pro 26 running right. I set needles at factory settings and it doesn't run all that well, as expexted. I set the high for just under max rpm and idle at a good reliable idle of about 2150 or 2200 rpm on the ground all is well nice smooth transition. I take off get up to a good attitude and and well it starts to stumble between 1/4 throttle and 3/4. I try running a little ritcher, no good, try leaner no good. With the cowel on or off no diff.. I've pulled the tank out took apart no problems there. I can run it on the ground for an hour and no problems, as soon as it is in the air midrange gone for a holiday. I am running this in a Funatana X100 with a 17-8 APC prop. Feul oil mix is 32:1. It starts well. Stock exhaust. Tested for air leaks no problems there, got me stumped so far. I'm at about 1100 feet above sea level, Shouldn't be an issue, also using an NGK plug, Tygon fuel line. Next I thin I'll take the carb off and check it out completely, pretty sure it's a carb issue. Anyways any help would be great. Yes I've read the forums, for those who just want to direct me back to the forums and thanks in advance for those who help. I know it is something simple just being fussy. lol Again Thanks



Wilki

[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.

[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.