kart_racer
Races karts
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- May 4, 2008
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- VT Acclaim 5M
Some of you will have read my previous posts on flywheels and my poorly running VT Ecotec.
I successfully completed a manual conversion 12 months ago, but have had problems since.
At the moment, it comes down to the crank seeming to wobble. At idle the crank bolt & harmonic balancer are visually wobbling slightly. This visually continues at revs until around 2500 and possibly higher (but is spinning too fast to see anything).
Also, at the lights, if i press the clutch in slightly i can feel pulsing through the pedal which makes me think the flywheel is experiencing the same wobble.
I have replaced the clutch/pressure plate (with new HD solid flywheel), as well as the harmonic balancer with barely any change. The solid flywheel seemed to change the feeling of the vibration in the engine (had an aged dual mass before), but it seems much the same.
The engine idles quite roughly and also sounds quite horrid through the rev range.
I've ruled out a cylinder down as removing each ignition lead or injector makes a difference at idle.
It appears that the timing might be out, and if the crank is moving, so is the harmonic balancer and therefore the interruptors for the crank sensor. I wonder if this is causing the miss.
The power up to 2500-3000 rpm is also quite 'stepped'.
I have also: changed O2 sensors, cleaned throttle body & plenum, tested resistances of all leads and the coils, readjusted the water pump pulley which was spinning off centre slightly, tried running the engine without the belt (issues all remain).
Anyone have any ideas? The engine really feels terrible, like an old truck, and I really hate driving the car like this. The power is poor at low rpm, so i have to rev it to take off or accelerate, the sound of the engine is painful to my ears, and the clutch action is very difficult, as if the flywheel & clutch plate aren't meeting properly because of the moving crank.
Could this be a valve issue or something? I would have thought if the crank bearings were gone the engine would have stopped long ago or atleast had some sort of knocking in the bottom end.
I successfully completed a manual conversion 12 months ago, but have had problems since.
At the moment, it comes down to the crank seeming to wobble. At idle the crank bolt & harmonic balancer are visually wobbling slightly. This visually continues at revs until around 2500 and possibly higher (but is spinning too fast to see anything).
Also, at the lights, if i press the clutch in slightly i can feel pulsing through the pedal which makes me think the flywheel is experiencing the same wobble.
I have replaced the clutch/pressure plate (with new HD solid flywheel), as well as the harmonic balancer with barely any change. The solid flywheel seemed to change the feeling of the vibration in the engine (had an aged dual mass before), but it seems much the same.
The engine idles quite roughly and also sounds quite horrid through the rev range.
I've ruled out a cylinder down as removing each ignition lead or injector makes a difference at idle.
It appears that the timing might be out, and if the crank is moving, so is the harmonic balancer and therefore the interruptors for the crank sensor. I wonder if this is causing the miss.
The power up to 2500-3000 rpm is also quite 'stepped'.
I have also: changed O2 sensors, cleaned throttle body & plenum, tested resistances of all leads and the coils, readjusted the water pump pulley which was spinning off centre slightly, tried running the engine without the belt (issues all remain).
Anyone have any ideas? The engine really feels terrible, like an old truck, and I really hate driving the car like this. The power is poor at low rpm, so i have to rev it to take off or accelerate, the sound of the engine is painful to my ears, and the clutch action is very difficult, as if the flywheel & clutch plate aren't meeting properly because of the moving crank.
Could this be a valve issue or something? I would have thought if the crank bearings were gone the engine would have stopped long ago or atleast had some sort of knocking in the bottom end.
