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CRRC 40cc kit

Old 11-30-2008, 01:12 PM
  #51  
SRimer
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Default RE: CRRC 40cc kit

You are probably correct, thanks.
Old 11-30-2008, 05:17 PM
  #52  
mpascual
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Default RE: CRRC 40cc kit

Maybe when top of piston is plenty of carbon deposits, engine performs better due to high compression ratio .....
Read this from Toni Clark (Zenoah distributor) :
....Experience has shown the power steadily increases over the first thirty flights, and
even after this time, the power will increase from season to season, due to the build-up
of carbon deposits on the piston crown and on the combustion chamber walls. This
carbon build-up increases the compression ratio. Because the engine is designed for
an extraordinary long life span, even when mineral based two stroke oils are used,
the designers had chosen a relatively low compression ratio to allow for a considerable
amount of carbon build-up. So "don't worry" about carbon build-up and as long
as it is not in the piston ring groove, do not remove it, instead "be happy" about the
extra power! .....

From ZG20 user manual ...
Regards
Old 11-30-2008, 06:20 PM
  #53  
bipeman-RCU
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Default RE: CRRC 40cc kit

Now that is some good info!

I never thought about carbon build up as a good thing. But then, it has to happen, so why not take advantage of it?!

Could it be, that with this $210 gas engine, that we are the beneficiaries of such advanced thinking?

Old 11-30-2008, 07:19 PM
  #54  
mpascual
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Default RE: CRRC 40cc kit

On many gas engines, power increases with time and running after break-in . Part of this increase is because piston ring seats on cylinder walls, but carbon deposits is a factor on this increase also.
Regards
Old 11-30-2008, 11:48 PM
  #55  
dumorian
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Default RE: CRRC 40cc kit

My brief testing in the air seems to leave me thinking the 20x8 is the prop. I tried it with a 20x6 on a quarter scale Kat and it just seemed like I had to really keep the revs up. Also on the ground at full throttle, the RPM was a bit high. I didn't record what it hit. Now, if I could just get my Futaba equipment to be as reliable as my CRRC 40cc, I might actually be able to keep something in the air long enough to really test the engine. It has run like a top throughout breakin on the ground and in my brief times in the air. It's scheduled to go on the third model now. Meanwhile, my radio and all planes are grounded until that gets sorted out.
Old 12-18-2008, 12:27 PM
  #56  
wantitbad
 
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Default RE: CRRC 40cc kit

so whats the verdict on these kits?
Old 12-18-2008, 12:36 PM
  #57  
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Default RE: CRRC 40cc kit

I have not even had time to put mine together yet! Bummer. Will do soon.
Old 12-18-2008, 09:04 PM
  #58  
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Default RE: CRRC 40cc kit

i would like to say i was quite a critic when my fried ordered one i was like haha its a kit engine but my eyes were wide open when his fired on the 3rd flip and took no carb adjustment and my new dl 50 and i were goin around and around took me longer to get mine started than to break his in and its been a wonderful engine for him it was his first gasser on a katana then on yak never any issues. good engine[>:] wish mine would have been as good as his lol
Old 12-20-2008, 07:58 PM
  #59  
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Default RE: CRRC 40cc kit

Hey all,I put mine together last night,took about an hour.If you have done a couple conversion engines,this kit will be very easy.I ran it today for about two hours(about a half gallon of gas)with the needles set just as they came from the factory.It hand started on about the fourth flip.That was after I tried to start it the way I start all my other gassers and then followed the instructions,choke on flip it till it pops,choke off three or four flips and it's running.Idled at about 2000 rpm's and topped out at about 6700 to 7000 rpm's on first tank of gas.On the last tank of gas it idled at about 1800 rpm and topped out at about 8500 to 8700 rpm's with a MAS 18x6 Classic prop.I tried a MAS 20x8 prop but I think it was to much prop for breaking in this engine,I could only get about 6500 rpm's and it seemed to run a little hotter.Maybe after a little more break in I will put the 20x8 back on and see what it does then.All in all this is not a bad little engine for 199.00usd and you will not believe the throttle responce and transition on a brand new engine.I hope to put mine in my H9 USL120 that has a BCMA 26 in it right now and needs a bit more power.

Jim
Old 12-20-2008, 08:17 PM
  #60  
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Default RE: CRRC 40cc kit

I would leave the 20x8 prop on it, The HP curve tops out at 7200 and max torque comes out even lower. I assemble and run all of them we sell with a 20x8 JXF from day one and that little engine loves it.

Jody
Old 12-21-2008, 12:03 AM
  #61  
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Default RE: CRRC 40cc kit

Thanks Jody,how long does it take to break these engines in?

jim
Old 12-21-2008, 02:14 AM
  #62  
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Default RE: CRRC 40cc kit

Not long at all, I run them with 32:1 for about 30-45 minutes. After about 20 minutes you can hear the engine change pitch and start running a little "different". At this point I will adjust the carb and set the idle speed screw make sure the transition is good, then I shut it off let it cool and restart. Nothing should have changed, get it good and warmed up and shut it off do a couple of hot starts (1 flip at idle), if all is good (always has been) it's ready to fly. From then on I consider it broken in and will run it on 50:1 Stihl synthetic forever, check mixture settings with the 50:1 fuel mix. There is more wearing in to happen over the next couple of gallons of gas but it is of little import, rings have seated already and the engines will hold rpm's steady. Enjoy!

Jody
Old 12-22-2008, 01:01 AM
  #63  
Bladejunkie
 
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Default RE: CRRC 40cc kit

Hey all,mounted my engine to my H9 USL120 I don't think I'll be using the 20x8 prop on this plane,only about 1/2inch of ground clearance.Any suggestions on a three blade prop?I changed the spark plug to a NGK BPMR6F,and ran it for another hour on the test stand today before mounting it on the plane.Thanks Jody for your tips.

Jim
Old 12-22-2008, 02:55 AM
  #64  
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Default RE: CRRC 40cc kit

I think I would put a 3/4" block between the gear and the bottom of the fuse or make a new set of gear. A wood 3 blade prop is kind of spendy. If you wanted to try one, I would start with an 18x10 but it may not be easy to find.

Jody
Old 12-22-2008, 04:58 PM
  #65  
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Default RE: CRRC 40cc kit

Hi all!

What peak rpms are you getting about with 20x8 JXF ?? I am planning to use this engine to do some 3D at 13lbs Edge. Do you know the total thrust achieved with the 20x8 JXF?

Regards!
Old 12-27-2008, 10:43 PM
  #66  
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Default RE: CRRC 40cc kit

Hey all,well I flew my H9 USL120 with this engine today,and all I can say is wow!!!!I feel like I've got a totaly different airplane,it has a take off roll of about ten feet.Vertical perfomance is limited only by my eyesight.Jody you were right on about the 20x8 prop this engine really seems to like this prop.I started out with a 18x8 prop and it flew just like it had the BCMA 26 on it,I then tried 20x6-10 wood prop on it and what a difference it was like a rocket,but I broke that prop on the second flight.I tried the only prop I had left,a big ole MAS 20x8 Classic,I think this is the best prop for this airplane engine combo.

Jim
Old 12-28-2008, 09:50 AM
  #67  
bipeman-RCU
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Default RE: CRRC 40cc kit

Hi Jody,

What RPM do you like to break theses in at? The instructions just say "at a slow speed".

Thanks...
Old 01-04-2009, 01:40 PM
  #68  
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Default RE: CRRC 40cc kit

Hi guys,

Was on vacation between Christmas and new years, had to go out and kill something.

JR007, I'm getting 6500-6700 on the average with the JXF 20x8 when I test run the engines before shipping them. I've not done any thrust measurements but it will hover a 12 pound plane at about 1/4 throttle.

Jim, glad to here things are working out so well for your stick!

Bipeman, I start them up and let them run about 3000 for about 20-30 minutes, make sure your'e getting plenty of cooling. I then adjust the carburetor for 100-150 rpm richer than peak. Then adjust low end for best idle and transition, recheck the high end. Then you are ready to mount it and fly. 32:1 for the first 2 or 3 gallons and then go to 40-50:1.

Jody
Old 01-08-2009, 03:09 PM
  #69  
SRimer
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Default RE: CRRC 40cc kit

I fired mine today, however 9 time of 10 it will fire backward run a little and quit, any idea, the the sensore is fixed, no adjusment,
when it runs normal, it runs great. thx
Old 01-08-2009, 08:12 PM
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Default RE: CRRC 40cc kit

SRimer mine does the same thing when I try to start it with the idle set to low.How do you like your engine?Mine just gets better and better.I'm thinking of putting together another one for a project I've got coming up.Well good luck with your engine.

Jim
Old 01-08-2009, 08:26 PM
  #71  
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Default RE: CRRC 40cc kit

There is a small amount of room to move the sensor to retard the timing maybe a degree or so, try that. Try also to start it at a different throttle setting and if that doesn't work you may have a malfunctioning ignition module. Did you buy your engine from VVRC?

Jody
Old 01-08-2009, 10:49 PM
  #72  
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Default RE: CRRC 40cc kit


ORIGINAL: jedijody

Hi guys,

Was on vacation between Christmas and new years, had to go out and kill something.

JR007, I'm getting 6500-6700 on the average with the JXF 20x8 when I test run the engines before shipping them. I've not done any thrust measurements but it will hover a 12 pound plane at about 1/4 throttle.

Jim, glad to here things are working out so well for your stick!

Bipeman, I start them up and let them run about 3000 for about 20-30 minutes, make sure your'e getting plenty of cooling. I then adjust the carburetor for 100-150 rpm richer than peak. Then adjust low end for best idle and transition, recheck the high end. Then you are ready to mount it and fly. 32:1 for the first 2 or 3 gallons and then go to 40-50:1.

Jody
You say you test run the engines before you ship them. Have you done quite a few and do they all come out to be good engines? Thaks capt,n
Old 01-09-2009, 12:56 AM
  #73  
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Default RE: CRRC 40cc kit

Yes Capt'n, I assemble the engines, test run them, and adjust the carb on every one we sell. I've done about 30 of them so far and all have been great runners. I did get one back yesterday, the only one so far, and I should have caught the problem before it left, added a new item to QC checklist. I have been running the snot out of two of them since August and so far they are doing great. Nice and tight package for 40cc and spinning a 20x8 JXF at around 6700 right out of the gate. From us these engines have a one year warranty, assembled and tested, if you buy them elsewhere in kit form your only warranty is that all the parts are in the box when you open it, from there you have 30 feet or 30 seconds whichever comes first.

Jody
Old 01-09-2009, 09:34 AM
  #74  
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Default RE: CRRC 40cc kit

Hey Jody,

Synthetic oil OK for break in?

Thanks for all your input on this thread. Very helpful!

Mike


Old 01-09-2009, 11:20 AM
  #75  
SRimer
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Default RE: CRRC 40cc kit

I'll try to retard the sensor,
so far i'm happy with the engine and the way it runs, except for the starting issue,
I bought it of ebay, i'm not sure where it cames from.

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