CRRC Pro GF26I

[davidjensen]

Yes at the RC Expo he said he replaced the front end of the case.

[Jedijody]

	Quote: Originally Posted by davidjensen
	Yes at the RC Expo he said he replaced the front end of the case.

It was a loud and busy time at the Expo, so I can understand why I may not have been heard correctly.

I replaced both halves of the crankcase and both crankshaft bearings and used bearing lock. I also did a mod to the propshaft to make it run more true, less vibration is much easier on the crankshaft, bearings and crankcase.

[davidjensen]

Yes it was loud and my hearing is going away. Thanks again. The engine is mounted and the Yak is ready to fly again.

[davidjensen]

Well the 3rd CRRC pitts style muffler failed in less than one flight. What muffler are you guys using on your CRRC 26 engines?

[3Dguy]

I'm using the pitts muffler. If your stock one keeps breaking, you should try cutting the pipe shorter to reduce stress.

[2robinhood]

I never even mounted the stock muffler. I used the pitts from day one and never had an issue.

[pmikeyg]

I have read all 56 pages and now I have a few questions. First I want to know if everyone thinks this is a sound engine. I read all the initial problem, but it seems they have worked most of the bugs out. Second, I have a Funtana X 100 that I want to put one in. My question is concerning the balance of the plane. It is a little heavier than a Saito. Is this gonna be a problem? This is my entry into gas airplane engines and I want to do it right the first time!

[davidjensen]

I think this should do the job. I JB welded the canister back onto the header and added the hose clamp to keep it together. The canister is glued to the engine box with RTV. I want to fly tomorrow.

[3Dguy]

I'm not so sure about the JB Weld. It might hold, It might fail, but your clamp should take care of that. My pitts muffler is still going strong. No signs of cracking.

pmikey...I've seen this engine 3D a Funtana, so you should be fine.

[2robinhood]

I never had an issue with my pitts muffler either.
I had over a hundred flights on mine.
Are you sure that the muffler can isn't vibrating on the engine box and acting like a hammer ?
Just beating on the muffler the entire time the engine is running?
Looks kind of close.

[3Dguy]

	Quote: Originally Posted by 2robinhood
	I never had an issue with my pitts muffler either. I had over a hundred flights on mine. Are you sure that the muffler can isn't vibrating on the engine box and acting like a hammer ? Just beating on the muffler the entire time the engine is running? Looks kind of close.

Well, it's looks like it's RTV'd to the engine box, so it is touching. lol

[davidjensen]

There was about 1/8+" clearence between the engine box and the muffler. I have tried to physically move the engine to see if I can make the muffler contact the wood and I cannot.

[ken crane]

robinhood and i have probably more flights on our 26 and 50'S than 10 guys combined. if i can offer any advice try a zenoah pitts or side mount muffler. the exhaust angle is slightly off from the stock but will fit. i no longer have any 26 cc but havewell over 10 at our field for the guys in the club. all running strong but most of the mufflers have failed. i have had issues mostly with the 50cc. the bisson side mount for mine were slightly more restrictive but gave the motor a real nice tourque curve over pure speed. it took a little of tuning but i got tired of replacing mufflers. another trick i found was to use the magic aluminum welding rods you see at the tool shows. do this on a new stock muffler and re weld per se and hit all the welded joints. this wont work on a used muffler unless you soak and ultrasound clean it .too much goo. hope this helps

one other suggestion. make sure your prop is balanced real well to eliminate any vibration.

[davidjensen]

Thanks Ken

You are the first pilot to say they have seen these mufflers fail. I used to fly heli's and I know how to balance things and the jfx wood props I'm using balance almost perfect right out of the bag. The 17x6 needed just a touch of clear lacqer on one tip to balance it

[ilias]

hi

i have a new gf26i engine and i dont know alot with gas engines

i made a metal stand and put the engine . i have alot of vibrations and i dont know why. if i put the engine on the plane will this resolve the problem ?? or this is a problem of the engine?? how can i solve the problem??

thank you