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 Post subject: realy need some help!
PostPosted: Sun Dec 17, 2006 00:26:49 
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Joined: Sat Dec 09, 2006 22:07:37
Posts: 21
Location: Deeside, North Wales
having a few problems guys... i started my nt18t for the first time today, it started well but it ran at a realy high rpm at idle, so i adjusted the idle screw till it cut out, then i turned it back a quater turn so it would keep running... but it still seems realy high!! when i put it on the floor it shoots off like the throttle is open... so i thought id just put up with slowing it down with the brakes just for the break in period so i applied a tiny ammount of brake to slow the truck and the engine cut out emideately... not sure why, i rang my lhs and they said to raise the idle rpm so that it didnt cut out, but that just made it roll even faster at idle, and the brakes still stopped the engine!!! i never thought the brakes should have an effect on the engine... just so you know, the carb doesnt move between idle and brake, so its not that...

at one point i managed to get the engine to keep running on full brake (pure fluke!) and even then when i applied the brakes the rpm went down, just not quite as low as zero lol...

all help will be very appreciated!!!


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 Post subject:
PostPosted: Sun Dec 17, 2006 02:00:04 
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Joined: Tue Oct 04, 2005 01:02:57
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Location: Washington (State), United States
So are you saying at idle, the car still wants to move forward? Could that be your clutch spring settings?


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 Post subject:
PostPosted: Sun Dec 17, 2006 02:15:40 
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Location: Las Vegas, NV
More info we need. like How much air gap is the throttle open. If you just assembled it It has to have a hi idle for the clutch to engage. New clutch spring are tight when new.


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 Post subject:
PostPosted: Sun Dec 17, 2006 02:42:06 
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Location: Denmark, copenhagen
clutch springs are my guess too, but have you tryed to look down your cab and see if it closes when you apply brake?


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 Post subject:
PostPosted: Sun Dec 17, 2006 10:41:04 
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Location: Deeside, North Wales
Quote:
have you tryed to look down your cab and see if it closes when you apply brake?


the carb doesnt move when i apply the brakes... it stays open about 1.5-2mm

Quote:
How much air gap is the throttle open


well as i cant realy get a ruler in there id take a guess at about 1.5-2mm

Quote:
So are you saying at idle, the car still wants to move forward? Could that be your clutch spring settings?


that could be the problem i guess... could you explain how i change them please...


also the main problem is not that the car rolls forward at idle, the main problem is that the engine dies as soon as i tap the trigger in the direction of the brakes... before the brakes are actualy applied, if you see what i mean...


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 Post subject:
PostPosted: Sun Dec 17, 2006 11:57:18 
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Joined: Sat Oct 23, 2004 08:22:54
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Location: Holland
It seems the LSN is not set correctly

When it is set to lean it will give a high idle and it is difficult to set the idle.


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 Post subject:
PostPosted: Sun Dec 17, 2006 17:41:45 
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Location: Las Vegas, NV
First things first. Center all the sevos & linkages as per manual. The manual will show you the adjustment screws Idle speed, HSN, LSN. Get familiar with it, cuz I dont have t descibe it to you all.

The engine is set up to start for you right away. the next thing to do is the break-in procedure. And doing that, leave the car on the starter box to keep the wheels elevated.

Start the engine. Set the idle sped lower. Then The HSN to 1/8 turn to CW direction to start leaning it out.Continue with the CW HSN till you have good acell to 3/4 quaters throttle. If your idle rises , turn it down a trish. When accelleration is achieved. Start adjusting the LSN.

LSN turn slowly CW. The idle will rise, stop there. It started to get lean, Tun the idlespeed down a touch. and turn the LSN 1/8 turn CCW. At this time it wold be close to running smoothly , ADJUST THE hsn if you lean it out some more. LSN yo'll seldomly adjust cuz, it is proportional tothe HSN.

Doing the adjustment by steps will keep you from being confused. Setting idle speed first, HSN next, LSN last'

Try that! hope it helps! Adjustment done with wheel elevated. Then we'll go from there.

After all that, the fun begins. Clutch adjustment will be Found under the FAQ.s thread in the forum. Just ask there are three guys here to help, Myself , kant & mini. We'll steer you in the right direction.


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 Post subject:
PostPosted: Sun Dec 17, 2006 19:26:50 
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Location: Osceola Ia.
Try using a 1mm allen wrench to gauge your carb opening setting.Then if the idle is too high slowly turn the low speed neddle in 1/8 increments ccw or open till the idle slows.if the idle is too slow turn the low speed neddle clockwise at 1/8 increments till the idle is to the desired sound.With 30%
nitro fuel run the highspeed neddle 3 turns out.Also check to makesure that the exhaust manifold is sealed at the exhaust port ,a vaccumn leak would give you alot of trouble like you are having.I have the picco p-0 in my nt18t and it rips.good luck.Also have you read the tuning tips in the nt18t engine manual.


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 Post subject:
PostPosted: Sun Dec 17, 2006 20:30:15 
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Location: Deeside, North Wales
thanks for all the help guy, im not quite sure where to start now, i think il try richening the lsn first, i think that might help... then il try the rest of them...

it will have to wait till tomorow though... DAMN BRITISH WEATHER!!!!


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 Post subject:
PostPosted: Mon Dec 18, 2006 00:32:08 
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Location: Las Vegas, NV
From my last post. Not getting to confusing. When you start up. your wheel turn. Lower your IDLE Speed down til they stop turn. Then the HSN & LSN as been mentioned on the first post. Idle speed, HSN, then LSN is the procedure to follow.


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 Post subject:
PostPosted: Mon Dec 18, 2006 00:41:19 
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Location: Deeside, North Wales
well thats all very good in theory, but what hapens if the wheels just dont stop, the engine cuts out first...


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 Post subject:
PostPosted: Mon Dec 18, 2006 00:54:45 
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Joined: Thu Dec 22, 2005 22:09:47
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Location: Denmark, copenhagen
well have you taken off your clutch bell and checked your clutch springs yet? they are easely destroyed if you didnĀ“t take care when installing them.


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 Post subject:
PostPosted: Mon Dec 18, 2006 00:58:28 
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Location: Deeside, North Wales
i havent done that, and as i bought the kit half built off my uncle i dont realy trust his building skills, i will not be happy if he has done it wrong.

i will check that first thing in the morning, its just a pitty you cant realy check without removing the engine... :evil:


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 Post subject:
PostPosted: Mon Dec 18, 2006 03:54:09 
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Location: Las Vegas, NV
If its dies b4 the wheels stop turning, something is binding the Clutchbell. If you remove the engine, the clutchbell should be freewheeling. Or with it not running and the throttle open manually. The car should be rolled on the ground with no resistance, back and forth. If not the clutchbell is binding.
If removing the engine , just remove the countersunk screws (4), that way you dont have to redo the mesh between the spur & pinion.


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 Post subject:
PostPosted: Wed Dec 20, 2006 19:51:38 
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Location: Deeside, North Wales
kant76 was closest!!!!! the clutch springs werend bent around the shaft... so the clutch shoes were just hanging there... lol

so, i got it going and the wheels dont spin at idle (well only a tiny little bit) which is good!

it ran well for a while but with little spikes in the rpm... they were about every 15seconds but they kept getting closer together until they were every couple of seconds... until i got sick of it and squeezed the fuel line...

i think this is a problem with the needles ore the idle screw... i just need to know which one to adjust and which way...

so again lads, all help is greatly appreciated


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 Post subject:
PostPosted: Wed Dec 20, 2006 20:41:05 
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Location: Las Vegas, NV
Out of the box, engine is set up to run. You just have to fine tune. Start it and let it warm up, about a minute or so. Turn down the idle to a desired rpm, a lower speed. Toki give a referance of 1 mm. Adjust the HSN CW 1/8th turn at a time. til you have good accel and to idle. Then turn the LSN slowly til the idle speed rises. When it rises it starting to run lean at idle. Turn the LSN 1/8 turn CCW. It should be close. Run a few laps and adjust HSN for smoke 1-2 sec of it. Just let it run that way till you broken-in the engine. Then you may lean it out some more.

Just remember to make it easier to adjust the Idle speed first, HSN second, LSN final adjustment. Follow thse procedures, you wont get confused. After all adjustment are made, You'll probably adjust the LSN seldomly. Cuz it is proportional to the HSN. The LSN only works at 1mm to 1/4th thottle, and 1/4 trottle to WOT is the HSN.

Turning the screw CW leans it out, CCW richen it. Idlespeed screw CW raises the idle speed. CCW lowers idle.


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 Post subject:
PostPosted: Wed Dec 20, 2006 20:48:20 
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Location: Deeside, North Wales
okidoki, il try that tomorow, the thing is i had already adjusted the idle and the lsn before i found the source of the original problem. what are the factor settings so that i can start again?


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 Post subject:
PostPosted: Thu Dec 21, 2006 01:31:34 
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Location: Las Vegas, NV
Probably not much. you didnt touch too much. Well priming the carb with the start box will tell ya. If it draw fuel right away into the carb. Your in good shape. It'll be easy. If not just blow into the pressure hose, to prime the engine. Just follow the procedure I gave ta, you wont go wrong. You can alway get a hold of us on the forum.


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 Post subject:
PostPosted: Fri Jan 12, 2007 05:44:12 
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Joined: Mon Jan 08, 2007 02:49:50
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Location: Massachusetts
You can go here:
http://www.teamxray.com/teamxray/produc ... AY%20NT18T

..and download the engine manual which has all the adjustments and factory ettings. All the manuals are there in case you didnt get those.
They're also located in the FAQ thread


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 Post subject:
PostPosted: Sun Feb 11, 2007 19:06:28 
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Joined: Sat Dec 09, 2006 22:07:37
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Location: Deeside, North Wales
just thought id let you guys know, ive sorted most of the problems (still leaks quite a bit but i think its normal to leak a bit... i took a little video of it...

http://www.youtube.com/watch?v=TsAVcgAY9ko


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