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Old 08-12-2006, 05:29 PM   #1
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Default .21 engine problem plz help

hi i have an x-ray xb8 and have no problem with it the problem is that the engine has lost compression and still goes tho when i use it for a few mins it starts bogging down for the first 2-3 secs of trigger then it shoots off with no problems so i need to get rid of this 2-3 sec pause as it loses time and is uncompfortable driving like that i want smooth acceleration from the instant i pull the trigger any ideas??
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Old 08-12-2006, 07:02 PM   #2
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Are you getting a lot of smoke when it is bogging down ? If not you are getting a lean bog and running the engine lean . Also a little more info is helpful . What temp is the engine running at ? What engine and which glow plug are you using ?
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Old 08-12-2006, 10:36 PM   #3
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If, as you say, the engine has lost its compression then it will only run for a few minutes or until it warms up enough so that the sleeve expands and then there is no compression at all. That is the reason it bogs down.

Time for a rebuild or engine replacement.
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Old 08-13-2006, 02:20 AM   #4
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Default pinching

i think i may have cured the problem of the bog down by reducing my idle screw setting but by doing that i have another problem of the engine dying after it gets warm when its idling so thats why i increased the idle screw in the first place so it wouldnt stall but by doing this it the car moves without applying brakes or no throttle so i guess ill have to compromise until i can get a new engine or piston and sleeve.

i think ive run out of options with this engine except one which is the pinch ive heard about. anyone know how to achieve this in the best way possible?
i have heard you use a pipe cutter but how much pressure or how tight should i set the pipe cutter and will a cheap cutter do the trick?
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Old 08-13-2006, 02:23 AM   #5
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No! cheap pinchers for RC sleeves are bad. only one place iver herd that does the job. Rayaracing.

Cheap ones distort the sleeve and doesnt keep it perfectly circular...goes oval.
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Old 08-13-2006, 07:27 AM   #6
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There are some good pinchers available on ebay and other sites . But if you are not carefull you can very easily overpinch and then you are screwed . I have a few pinchers and have been using them for a few years now and have become very good with them . Since you have never used one , take your engine someone that does pinching or if you have a few old junk engines laying around you can practice on those first . If you use anything else but a proper pincher you will ruin the sleeve and oval it . Don`t ever try any of these cheap myths that don`t work properly .
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Old 08-13-2006, 09:29 PM   #7
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ok thanks for the tip i have hobby shops in my area that dont do this stuff but have heard of shops that do which is a bit of a drive so i guess ill have to fill the petrol tank.
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