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-   -   Idle = full power (http://www.rcuniverse.com/forum/car-nitro-gas-engines-269/11252157-idle-%3D-full-power.html)

Varhunter 10-05-2012 01:02 PM

Idle = full power
 
I'm helping a friend get his engine running after it's sat for a while. I've got it running but the idle is waaaaaaaay too fast. The throttle servo looks fine to me and the trim is down. My thought is the idle adjustment. Iset it to factory break in settings but it's still running fast, it's like it's wide open at idle.

Anthoop 10-06-2012 02:49 AM

RE: Idle = full power
 
Remove the air filter and check the throttle gap...should be 0.5-1mm. If that is correct but it is still revving high, then the mixture is lean, richen the LSN.
What engine is it?

Varhunter 10-06-2012 11:28 AM

RE: Idle = full power
 
I see Thunder Tigre 27 on the side, The exhaust dumps out the back of the engine.  I've looked at that gap and it looks about right to me, I guess i'll try getting it smaller and see.

Anthoop 10-06-2012 01:16 PM

RE: Idle = full power
 
I can not find a ThunderTiger .27 with a quick search, can you put some pictures up?
Is it a slide or barrel carb and how many adjustment screws are there?
Remember that if the gap is near and it still revs high then the mixture is too lean.

proptop 10-06-2012 01:19 PM

RE: Idle = full power
 
It might be the Super Tigre .27?

Anthoop 10-06-2012 01:26 PM

RE: Idle = full power
 
Quote:

ORIGINAL: proptop

It might be the Super Tigre .27?
I had a feeling it was not a car engine at the start...and hi btw. ;)

Is this the one Varhunter?
http://manuals.hobbico.com/sup/supg0727-manual.pdf

proptop 10-06-2012 09:40 PM

RE: Idle = full power
 
Hi Anthoop...how are ya!? Where is Somerset? A good friend of mine was born in Kent...Suffolk (I think I spelled that correctly? ) but now lives over here in the states...Montana....but I digress :D

Actually, this is the engine I was thinking of...used in some of the Duratrax vehicles...

http://www3.towerhobbies.com/cgi-bin...?&I=LXLDF6&P=0

http://www3.towerhobbies.com/cgi-bin...&I=LXLZJ1&P=SM
Edit: Added 2nd link to blue headed version...

Anthoop 10-07-2012 01:01 AM

RE: Idle = full power
 
I am good, thanks..hope you are too, been a long time since I saw you around these parts. Somerset is way down in the sunny (!) SouthWest, whereas Kent is over to the East....not so sunny. :)

The plot thickens then...looks like it is possibly the same engine....let us see if you are right. ;)

JohnP2 10-07-2012 11:25 AM

RE: Idle = full power
 
Get the "gap" as small as you canwhile still being able to start the car. If that does not work, check the clutch spring(s). I had this problem recently, and it turned out I broke a clutch spring. Let us know how you do.

nitroexpress 10-07-2012 05:28 PM

RE: Idle = full power
 

Quote:

ORIGINAL: Varhunter

I'm helping a friend get his engine running after it's sat for a while. I've got it running but the idle is waaaaaaaay too fast. The throttle servo looks fine to me and the trim is down. My thought is the idle adjustment. Iset it to factory break in settings but it's still running fast, it's like it's wide open at idle.
To clarify, is it running fast or wide open. Two very different things.

Varhunter 10-07-2012 05:38 PM

RE: Idle = full power
 
Prop top has it right, it has a blue head on it though but that's it.  It sounds like it's running wide open.  but like i said the carb isn't in the wide open position.

proptop 10-08-2012 07:12 AM

RE: Idle = full power
 
There might be some sticky-gooey old oil residue gumming up the works? Maybe try flushing out the carb w/ fresh fuel...you might need to pull the high speed needle out to do this throughly...and clean the slide too...

My thought is that the fuel passages in the carb might be partially restricted by old gummy fuel? (causing a lean condition...and maybe a sticking slide )

Anthoop 10-08-2012 09:31 AM

RE: Idle = full power
 
You have set the LSN and HSN as in this link? http://www3.towerhobbies.com/cgi-bin...&I=LXLZJ1&P=SM
...and richening the screws (anti-clockwise) makes no difference?

Then I agree that it is probably some gummed up fuel, could be in the carb/tank/pipes/exhaust nipple.

We know the engine is running lean if the gap is small enough...so either we are not supplying enough fuel or excess air is getting in. My guess is fuel starvation rather than an air leak as you say the engine has not been used for a while.

Varhunter 10-08-2012 10:06 AM

RE: Idle = full power
 
I set it all to the models book that came with it, not the engine book.  I plan on tinkering with it again today. took the carb off, and opened the head up and sprayed carb cleaner in it to try and clean it out, even sprayed the muffler.

Anthoop 10-08-2012 10:15 AM

RE: Idle = full power
 
What are the settings in the book?
LSN/HSN= how many turns?

Varhunter 10-08-2012 06:59 PM

RE: Idle = full power
 
They were the same as shown there or really close but I figured it out and I feel so stupid, I took the air filter off to check the gap at closed and the servo was reversed.  Thanks for all your help guys.

1QwkSport2.5r 10-08-2012 07:04 PM

RE: Idle = full power
 

Quote:

ORIGINAL: proptop

Hi Anthoop...how are ya!? Where is Somerset? A good friend of mine was born in Kent...Suffolk (I think I spelled that correctly? ) but now lives over here in the states...Montana....but I digress :D

Actually, this is the engine I was thinking of...used in some of the Duratrax vehicles...

http://www3.towerhobbies.com/cgi-bin...?&I=LXLDF6&P=0

http://www3.towerhobbies.com/cgi-bin...&I=LXLZJ1&P=SM
Edit: Added 2nd link to blue headed version...
Thats the same engine (though with a different color head yet..) that comes in the alligator tours r/c airboat. Same head design and carburetor, just a longer crankshaft. Its too bad SuperTigres aren't made in Italy anymore.

Anthoop 10-09-2012 08:15 AM

RE: Idle = full power
 

Quote:

ORIGINAL: Varhunter

They were the same as shown there or really close but I figured it out and I feel so stupid, I took the air filter off to check the gap at closed and the servo was reversed. Thanks for all your help guys.
Glad you got it fixed up. No need to feel stupid, the simplest things are often easily missed. ;)

Varhunter 10-09-2012 07:57 PM

RE: Idle = full power
 
That is very true lol, Thanks again for all the help.


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