RE: CRRC PRO GF26I  
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RE: CRRC PRO GF26I - 3/8/2007 4:51:32 PM   
TrikeFlyer


 

Posts: 79
Joined: 2/14/2007
From: Rowlett, TX, USA
Status: offline 		Hey Hardtop roger that spark!!

My GH26I now has over 2 hours on it with a Hawk 16X8. Choke venturi with thumb (EI off) flip 10 times to prime, turn EI on it starts on 2nd or 3rd flip if cold and first run of day. If it is a rerun, I coke it, flip 3 or 4 flips then turn on EI and it almost always starts on the FIRST flip!! This engine now runs like a swiss watch. All time is on my test bench with 10 min run, 10 min cool off, 15 min run, 15 min cool off, etc..

This engine did initially exhibit the "tightness" when I over primed it, but after one or 2 "runs" this went away. The compression is getting better and better after each run and cool down cycle.

Also, at first I did not have the idle screw open enough to overcome the intitial friction of the new engine and I had trouble getting it to run . After a few runs I have have now turned the idle way down from where I first started.

It will go into my Laser 200 this next week for maiden flight probably next Saturday. As soon as I get a nice selection of props I will do some RPM tests and post the results early next week.

Regards - Trike

(in reply to hardtop351)
       Post #: 51

RE: CRRC PRO GF26I - 3/9/2007 10:43:26 AM   
hardtop351


 

Posts: 257
Joined: 12/28/2005
From: rockhampton, AUSTRALIA
Status: offline 		not happy jan!!!!!

i got my new spark plugs this arvo and went home to hopefully start this engine. after 2.5 hours of trying to start it and swapping carbs to eliminate problems it STILL wouldnt start!!!. yes there was PLENTY of spark....yes there was fuel getting into the engine....removal of the plug confirmed this. however...it still wont start. it would run on any prime i sucked into the engine but it just wont keep running.

and i now know why....
the front shaft seal is not sealing at all. i applied soapy water to check for leaks and found the seal happily bubbling away. and due to this the engine doesnt create enough vaccum to draw fuel fron the carb and into the engine. the screwdriver is pointing to the gaps between the seal and housing. i have since removed this seal from the engine and as you can see the outside sealing surface is severly damaged. the seal was gently removed and no further damage was caused in its removal from the housing.

i will be trying to get a new seal tomorrow and fit it....everything else is unchanged

cheers
craig


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(in reply to TrikeFlyer)
       Post #: 52

RE: CRRC PRO GF26I - 3/9/2007 2:31:18 PM   
Herby 1


 

Posts: 10
Joined: 4/26/2003
From: Northern Arizona
Status: offline 		Get an NSK or NTN rubber seal bearing and you can throw the seal away...End of problem...Every 3w and G26 and GT80 is made with no crank seal, just the bearing...

< Message edited by RCIGN1 -- 3/9/2007 2:39:24 PM >

(in reply to hardtop351)
       Post #: 53

RE: CRRC PRO GF26I - 3/9/2007 11:38:02 PM   
TrikeFlyer


 

Posts: 79
Joined: 2/14/2007
From: Rowlett, TX, USA
Status: offline 		Thanks for the advice on the bearing RCIGN1.. I wonder if BOCA Bearings in Calif stocks them??

(in reply to Herby 1)
       Post #: 54

RE: CRRC PRO GF26I - 3/10/2007 12:49:41 AM   
Herby 1


 

Posts: 10
Joined: 4/26/2003
From: Northern Arizona
Status: offline 		They should, they have everything else....I think a 3W dealer would have one if Boca doesn't..Or Horizon, the bearing is probably a 6202 like the GT80....

(in reply to TrikeFlyer)
       Post #: 55

RE: CRRC PRO GF26I - 3/10/2007 1:04:34 AM   
hardtop351


 

Posts: 257
Joined: 12/28/2005
From: rockhampton, AUSTRALIA
Status: offline 		no they are 6001 bearings RCIGN1. i have now got a new shaft seal and 2 new bearings. the bearings are an NSK brand with a rubber seal. i will be removing all the seals except the side facing the front of the engine.

i will post my photos as i go

cheers
craig

(in reply to Herby 1)
       Post #: 56

RE: CRRC PRO GF26I - 3/10/2007 6:45:43 AM   
Bosshossv8


 

Posts: 1660
Joined: 8/12/2003
From: Schiller park, IL, USA
Status: offline 		I cheked mine out...it is at 40deg BTDC , the factory says this is right.

THere was a note in my email about waiting 30-40 seconds after a backfire...................

something about letting the counter reset in the ignition??

Anyways..mine is installed in an EF Yk-54 68". I will test fire it and break it in, in the plane. I don't like test stands....better to dampen the vibes with the plane shaking.

I used a remote kill setup and a switch on the plane for ignition, at 6v 5cell 1100mah nimh.

16 x 8 Master Airscrew Wood Scimitar....not going to be a performer, I have to get a xoar.

Flight reports after the weekend.

_____________________________

"Are you brave enough to milk a Yak?"

(in reply to hardtop351)
       Post #: 57

RE: CRRC PRO GF26I - 3/10/2007 3:04:13 PM   
hardtop351


 

Posts: 257
Joined: 12/28/2005
From: rockhampton, AUSTRALIA
Status: offline 		ive spent most of the night here still trying to start this engine. and it STILL wont start. its got 2 new bearings on the crank AND a new shaft seal at the front and STILL no joy in getting it to run.

i think the CDI unit has got something to do with it....i hear high voltage sparks being made even when the crank isnt turning. i tested this theory by using a test plug that i have and found that the CDI unit aint working as it should. it still sparks as it should but not when you want it to.

also guys....DONT be heavy handed in tightening up that little spark plug either. ive broken 2 plugs now. the thread separates from the body if you lean on them too much.the second one being an NGK plug.

i have taken some pix and will post them soon

cheers
craig

(in reply to Bosshossv8)
       Post #: 58

RE: CRRC PRO GF26I - 3/10/2007 4:40:33 PM   
TrikeFlyer


 

Posts: 79
Joined: 2/14/2007
From: Rowlett, TX, USA
Status: offline 		Hardtop there is an issue with the EI circuit. With everything hooked up ready to run, listen very closely to the EI box and you will hear it arc inside. Sounds like snap of spark at plug but inside the EI box. Yet when you plull the plug out it will spark normally at the plg and not inside the EI box.

Drove me crazy until I substituted an EI I had bought for my Ryobi conversion and still couldn't get it to run untill I turned up the idle quite a bit. It started on the 2nd flip and now starts every time on 1st or second flip.

I have not had to replace any seals or bearings. it now runs like a Swiss watch.

Now have over 3 hours on the engine and ready to transfer to my Laser 200. I will now change from the 32:1 Penz for break in to 40:1 Motul or BelRay synthetic.

Just about ready to do RPM test with different props and then do maiden flight in the Laser next week end.

Trike

(in reply to hardtop351)
       Post #: 59

RE: CRRC PRO GF26I - 3/11/2007 2:52:27 AM   
Bosshossv8


 

Posts: 1660
Joined: 8/12/2003
From: Schiller park, IL, USA
Status: offline 		Ditto...I am unable to make the motor run consistently , even after servely retarding the spark from 40deg BTDC static. Simply will not run .

The cdi unit is faulty, I have backfire hits mre than 40 times on a double welding gloved hand, and will not attempt again to run the motor with this ignition.

My hand would be hamburger if not for the double thick winter glove insert i put in my gauntlet welding glove. I was using the tips of the glove that my fingers do not reach into as a flipper and a few times it ran for 2 -3 seconds but seemed after many many many kickbacks and re-chokes.

I will talk to Jim at Western and figure out what the next course of action is. If we new the ignition parameters needed, BTDC Static , full advance, and start...that would be a good start to match up a correct igniton that matches the port timing.

_____________________________

"Are you brave enough to milk a Yak?"

(in reply to TrikeFlyer)
       Post #: 60

RE: CRRC PRO GF26I - 3/11/2007 8:10:52 AM   
Herby 1


 

Posts: 10
Joined: 4/26/2003
From: Northern Arizona
Status: offline 		40 static ? No way, 28 should be max..C&H type with electronic retard is static timed at 28, retards to about 2 BTDC after the first flip, then is linear to 28 at 4000 rpm...
Falkon and maybe some others start at 2 BTDC and advance with increasing rpm, don't know how far, but anything over 30 would be too far...
Magneto ignitions are timed at about 28 BTDC, there might be some that have some degree of change, like the Fuji....The funny shaped steel core is 2 different distances from the magnets, fire at different times according to rpm...

(in reply to Bosshossv8)
       Post #: 61

RE: CRRC PRO GF26I - 3/11/2007 1:48:07 PM   
hardtop351


 

Posts: 257
Joined: 12/28/2005
From: rockhampton, AUSTRALIA
Status: offline 		yes agree there is a CDI unit problem. RCIGN1...how about a sample CDI unit for us all to test?? lol i have it on good authority that the ignition unit for DA engines is actually made right here in australia!!! so i will find a phone number and call them to see if they have an ignition to suit this engine.

while i think of it i have an old MSD igntion box here....might rig up something and see if i can get it to work on this engine.

i also have my old CDI from my GF45 too.....so i have a few ignition system to try.

anyways...here are some photos ive taken. nice machining work inside.

cheers
craig

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(in reply to Herby 1)
       Post #: 62

RE: CRRC PRO GF26I - 3/11/2007 6:28:36 PM   
TrikeFlyer


 

Posts: 79
Joined: 2/14/2007
From: Rowlett, TX, USA
Status: offline 		Yah, Hardtop, I wanted to tear my engine down but didn't want the hassle of making new gaskets.

Just changed the EI and been running great ever since. Talk to Jim at Western Hobbies and he will give you the skinny on the EI module.

I agree the engine itself looks and runs great, My carb needles were almost dead on. Had to lean the low after an hour of running to smooth out the idle. Now idles good , starts on 1st or 2nd flip and runs forever on a 13 oz tank.

Goning to second phase of test program and installing into my Laser 200. The exhaust oil has turnd from black to almost clear so figure it has had enough bench time.

(in reply to hardtop351)
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