CRRC Pro GF26I

[hardtop351]

ahhh...good to see you guys STILL know how to stir the **** out of each other!!!.

just thought i'd drop a line in here seeing as i haven't posted here for soo long. as far as CDI ignitions are concerned i don't like them due to bad personal experience....its a glow plug only for me!!....(but big electrics are another interest too).

i've moved house twice since my last post and recently uncovered/blew the dust off my 26 cc engine....still on the test stand. it still needs an intake manifold to replace the one that ended up with strippe out threads and was warped too. i will be making one out of alloy in the not too distant future...HOPEFULLY!!

i have my eye on a few 120 size models here in the land down under. pity i want all 3 of them but the wife wont let me BUY all 3!!...guess we all know what thats like huh??. i'm a huge fan of the red bull air races and to this end i LOVE the extra 300 and its variants....will get back to you all when i get something suitable and ready to fly.

cheers
craig

[ken crane]

	Quote: Originally Posted by hardtop351
	ahhh...good to see you guys STILL know how to stir the **** out of each other!!!. just thought i'd drop a line in here seeing as i haven't posted here for soo long. as far as CDI ignitions are concerned i don't like them due to bad personal experience....its a glow plug only for me!!....(but big electrics are another interest too). i've moved house twice since my last post and recently uncovered/blew the dust off my 26 cc engine....still on the test stand. it still needs an intake manifold to replace the one that ended up with strippe out threads and was warped too. i will be making one out of alloy in the not too distant future...HOPEFULLY!! i have my eye on a few 120 size models here in the land down under. pity i want all 3 of them but the wife wont let me BUY all 3!!...guess we all know what thats like huh??. i'm a huge fan of the red bull air races and to this end i LOVE the extra 300 and its variants....will get back to you all when i get something suitable and ready to fly. cheers craig

craig funny you should say that as i removed my velocity stack and didnt shim the manifold properly and stripped mine out. no issue retapped new threads 1 size larger. then i found i created a leak (manifold warped)and needed to sand the manifold down on a piece of glass with 220 grit. worked like a charm. will have spares just in case as they are short money to have on hand.

[Doublesixes]

The CDI box that came with my engine does not say CRRC Pro at all on it. It's just an unmarked shinny plastic box that has a label on the back with a dating legend. Mine was dated at Jan 08.
As I posted earlier, I removed the jst connector between the sensor and the CDI because of faulty contact. It has worked fine ever since.
The engine burned 1/2 gallon so far and it's a solid performer. I wish I could extract another 900 rpm after break in is done. I suspect that it could be leaned out a bit too as I haven't touched either needle. I could be happy with 8000 rpm with a 18X6 after all is said and done.

[vettebob]

The cylinder head is a g26 clone. I still think you could get another 400 to 500 rpm by going to a g26 carburator 15mm versus 9mm should allow the crankcase to get a better precharge of air/fuel mixture. I know this depends on port timing and duration. But I bet it will work. Bob

[rcign]

/

[Doublesixes]

Bob, before I try something more radical as a carb replacement, i will see what kind of rpms I get after having burned at least 3 gallons. The 18x6 I'm using is great for 3D but I may need to try other options such as 17X8, even APC props.
I'm reluctant to start messing with the needles as the engine is preset at the factory and it works fine.

[ken crane]

26 in the lazer and the 50 pro being converted to my 330 that was a glow 3250 supertigre

[Doublesixes]

Well, it took less than a gallon to seize my CRRC PRO 26. The piston ring got unseated and destroyed the engine. This thing is worthless. It's the last time I buy a Chinese engine. Next time I'll spend some more for a quality product from US or European manufacturers.

[rcign]

I don't know how a piston ring can become "unseated", but....Carburetors can't possibly be preset....If you HAD "messed" with the needles the engine might still run...

[robertp17]

There is no such thing as "preset" from the factory. How do you know you were not lean on the high end and the thing detonated itself to death? Im not defending these engines, personally I dont own any chinese engines but im just saying that what happened with you could have happened with any engine if it was set too lean.

[Doublesixes]

The engine quit in mid air and it was not your typical deadstick. There was an ominous dry click noise that could be heard.
I removed the cylinder head and the ring was basically out of its groove. A ring should have both ends lined up with the small hole in the piston as to prevent rotation. In this case the ring had rotated beyond that point.
I never adjusted any carb settings as they are preset at the factory and it seemed to work fine until the episode I just described. There was another flaw in the engine and it had to do with the Hal sensor connector with the CDI box. I had to re-solder the whole thing to get a consistent spark.

[rcign]

The small hole in the piston is there for a pin that keeps the rings from turning in the piston and ending up in a port...Sounds like the pin in your piston either came out or was never in....the ring turned and got caught in a port, stopped the engine, probably destroyed the piston and cylinder....