H4CK3D4L1F3

So I just got my 2.5 Sportmaxx running again today and everything seems fine except for when the engine trys to hit high RPM.

Half throttle and everything is fine but when you try and really open it up the car just shuts off.

I've tried setting the highspeed needle 4 turns out and then adjusting it from there but nothings worked.

New glow plug and everything, new fuel lines, cleaned the engine.

What could it be?!

imaxx21

iTrader: (1)

richen up the high speed needle

tkhoo

iTrader: (45)

TS already mention he richen 4 turns out and retune but still same.

tristyn

iTrader: (4)

does the engine still have good compression

asw7576

Do you still some smoke at that point ?

If you see smoke at that point, that means the engine is still rich....... turn clockwise the high speed needle ( clockwise = to lean ) by half turn and see what happen. If the idle rpm become too high, turn the idle rpm needle anti clockwise .

Continue to lean the needle by 10 minutes increments until the engine sounds crispy enough when you accelerate to top speed. The best clue when to stop if you have a temp gun, and stop at around 95C to 105C ( coz some kit standard engine don't like high temp ).

Good luck.

joe of loath

iTrader: (1)

My old HPI G3.0 engine did this, and it was because it had no pinch left, and at low RPM it had compression, but at high RPM the fuel/air mix was being squashed out of the cylinder, so it died about 3/4 throttle. I had it repinched, but sold it so don't know how it goes now.

RockinRo

Before you run your engine, try rotating the flywheel and see if it's fairly easy to turn over or if there's noticeable compression left....if little or no compression then that could probably be your problem. If you're not sure, then try after the engine is run and up to temp, shut her down and see if there's any compression.

Or try the HSN as previously mentioned. Sometimes if it's lean it shuts off at full throttle.

How hot does your engine get? do you have sufficient cooling holes? Overheating shuts the engine down too.

H4CK3D4L1F3

So if it was bad compression how would i fix it? A new head gasket?

Trevor Williams

iTrader: (207)

you would need to purchase a new piston/sleeveset to be back to optimum specs.......You could always half a$$ it and just get a sleeve pinch done as well

Does'nt Traxxas have an exchange program for their engines?

H4CK3D4L1F3

How would bad compression cause the motor to run fine at lower rpm but then Completly die at high rpm?

H4CK3D4L1F3

Sorry if it's a noob question but what's "pinch"

KThatcher

iTrader: (64)

Also check your clutch bell bearings.. if those are bad your engine wont run right..

H4CK3D4L1F3

Okay so with a little searching i found out what pinch is and it sounds pretty plausible. Do i have to take it in somewhere to get it pinched or is this something i can do at home?

Another thing, could flame out be a possibility? It's a new glow plug but i was thinking it could maybe be faulty.

Jasonguy

iTrader: (4)

At lower RPMs the engine has more time to charge and discharge the cylinder and it is under less demand. At higher RPM the leakage by the piston is too great and creates a premature exhaust port. In a multi cylinder engine this would be indicated by a skip or dead miss in the powerband.

H4CK3D4L1F3

Another thing is, is that it happens at the same rpm everytime. It's very very consistant. There's no variation when it dies.

Im not sure if this is relevant or not. im just throwing it out there.