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CRRC GF45i

Old 11-05-2009, 06:23 PM
  #1626  
D_wilbur
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Default RE: CRRC GF45i

Does anybody know where I can find an intake manifold for CRRC 45 I stripped the threads on mine. Thanks
Old 11-05-2009, 07:21 PM
  #1627  
jedijody
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Default RE: CRRC GF45i

I think I have some but you could repair it with a Heli-Coil insert.
Old 11-06-2009, 06:27 AM
  #1628  
D_wilbur
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Default RE: CRRC GF45i

I though about a heli coil but there is only about 1/8" of metal to install a heli coil I don't think it will last. I would like to replace it.
Old 12-02-2009, 01:29 PM
  #1629  
paul0367
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Default RE: CRRC GF45i

I have noticed after 5 litre of fuel @ 20.1 that the prop has a play when spun / rocked back and forward, I only noticed this when the motor is cool so not sure if it is still there when hot. It still runs well and has good compression. Can anyone let me know if this is a normal, I have two of these engines and the one I have only put a tank through is still tight does not have any play at all
Old 12-02-2009, 02:35 PM
  #1630  
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Default RE: CRRC GF45i

I have one that has noticeable play fore and aft cold and hot. Still runs very well, so I will leave well enough alone for now. I may replace the crank brgs. if the play gets noticeably worse.
Old 12-02-2009, 04:18 PM
  #1631  
The Raven
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Default RE: CRRC GF45i


ORIGINAL: paul0367

I have noticed after 5 litre of fuel @ 20.1 that the prop has a play when spun / rocked back and forward, I only noticed this when the motor is cool so not sure if it is still there when hot. It still runs well and has good compression. Can anyone let me know if this is a normal, I have two of these engines and the one I have only put a tank through is still tight does not have any play at all
I've seen many a gasser engine with a little play when rocked back/forward. It's a combination of any play between the bearings, big end, little end, piston rocking in the bore, ring movement in the grooves, and the piston changing direction over TDC or BDC. Nothing to worry about unless it's quite a lot.

If you have a B&S 4 stroke mower (and probably lots of other mower engines), go check the play in that. You'll be surprised how much there is.
Old 12-02-2009, 04:33 PM
  #1632  
Pakratt
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Default RE: CRRC GF45i

On a lot of engines, you would be surprised.... I've noticed 20 to 30 degrees play at top dead center when you have the piston @ TDC according to the degree wheel...
Now, if you have side to side play, that is bad, and you would have to repair.....

I have about 13 gallons of fuel through my GF45i now, and still going strong... no side to side play, and it has noticeable rock (about 22 degrees) as the piston is @ TDC...
nothing to worry about.....
Old 03-07-2010, 06:38 PM
  #1633  
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Default RE: CRRC GF45i


ORIGINAL: netdudeuk

Here is a diagram from CRRC and approved for upload to this forum by Yong Xu which shows the mounting hole pitches.

Thanks
would anyone happen to know who i could contact for a diagram like this for the CRRC 50?

thanks,
Bart
Old 03-07-2010, 09:29 PM
  #1634  
jedijody
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Default RE: CRRC GF45i

Like this?
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Old 07-12-2010, 04:28 PM
  #1635  
poorwboy
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Default RE: CRRC GF45i

Hi all, I have the thor 45 which is the same motor as the crrc pro 45. This thing is full of problems and should be taken to the recyclers. I have changed the ignition to a rc excel, and that helped alot.
Now my problem is tuning I get the needles close runs fine on ground, but in the air it acts up. I had the plane flying today and thought all was well Flew for 10 minutes it was running good. Backed off throttle to come into a hover then went to accelerate again and it almost died. ***. So I get out of hover loop around hit throttle and it dies like it is lean. So I land and tweak my gear[:@], bring plane back over to stand fires right back up and runs fine. ***, I am done with this thing. complete junk. My dle's and my rcgf's run superb. This motor is a nightmare. If I still use it it will be on a plane I dont care about.
End of rant, Goodluck.
Old 07-12-2010, 04:42 PM
  #1636  
Pakratt
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Default RE: CRRC GF45i

I know what you mean......

I too went to an RCExcl ignition on the GF45i and it helped 50 times over!
mines still running pretty reliable at the present time....
but also it's on a plane that is disposable.....
an 82" corroplast spad aircraft that I designed.....
Old 07-12-2010, 10:11 PM
  #1637  
poorwboy
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Default RE: CRRC GF45i

Well I am making a last ditch effort, I am going to change the carb and see if that works. If that doesn't I am done with this thing.
Old 07-14-2010, 02:59 PM
  #1638  
poorwboy
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Default RE: CRRC GF45i

Well I changed the carb, and she runs like a top. I cant believe after all the work, sweat, and money I finally got this beer can running good. The metal manifold was warped really bad, so I put that on some glass with 400 grit paper to straighten it out. tore the whole motor down, and re sealed everything. Threw a smaller carb on and she runs like a top now.
Perfect transition, and top end is great. After all the money I threw at this thing I damn near could of bought a DA. I will give some tach numbers after she breaks in a little more.
Old 07-14-2010, 03:18 PM
  #1639  
Pakratt
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Default RE: CRRC GF45i

Most Excellent to hear Poorwboy....

What carb did you end up putting on it? Can you see the numbers on it?

Interested to see your tach numbers too...
Old 07-14-2010, 03:47 PM
  #1640  
jedijody
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Default RE: CRRC GF45i

Let me guess, a WT805?
Old 07-14-2010, 07:32 PM
  #1641  
poorwboy
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Default RE: CRRC GF45i

Lol, how did you guess. Thankyou so much for the pointer Jodi. She runs like a top now. I was searching through all my stuff, and found a good WT805 laying around.
Old 07-14-2010, 07:37 PM
  #1642  
jedijody
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Default RE: CRRC GF45i

Old 07-24-2010, 04:27 PM
  #1643  
poorwboy
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Default RE: CRRC GF45i

Well I did some taching today. I have maybe a half gallon through it since I fixed it. With a 20x8 top flite, I got 7500 through the stock muffler. Not to bad, I think there might be a little more in her though.
Old 07-24-2010, 07:16 PM
  #1644  
w8ye
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Default RE: CRRC GF45i

From my experience, this engine should be propped to run no faster than in the mid seven thousands on the ground
Old 08-20-2012, 12:08 PM
  #1645  
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Default RE: CRRC GF45i

Hi,

I have been having a similar nightmare with my Thor 45cc. Runs great on the ground but does not run well in the air. It will not run at full revs unless I'm climbing / inverted. Tried most of the advice written in these pages to no avial. Last ditch attempt is to replace the carb but not sure I can be cope with another false dawn. Have you seen an improvement in the air with the new carb?

Thanks,

John

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