after my motor died on the track, I built a new one. mahle pistons, eagle rods, stock crankshaft.

so it was decided to remove the balancing shafts. My mechanic made from stock shaft like that



after running the engine at idle is good, no vibration and extra noise. but from 3500 to 4500 low-frequency rumble of crushing on the ears. It doesn't matter stand still or machine is in motion.

Can this be due to the removal of balancing shafts?

thanks

 

how is the oil pressure is that checking out good. also it could be lifters and it could be a bunch of others.

 

Can't see your pic, but in a word: Yes.

That is pretty much the range where you would expect to pick up additional noise without the balance shafts. However, having had the shafts removed in my engine, I do not have any excessive noise, although it did wreak havoc with my stock knock sensor. I'd think about going with a BS eliminator kit from one of the well known vendors, such as AMS, instead of a homegrown solution.

l8r)

 

1.8bar on idle, in cruise 5bar. oil and water pump new.

my balance shaft like ams, nothing military in making no. but, who know...

 

Hay man, It could be your waistgate Actuator, after i rebuilt mine and removed my b.s it has made a vibration of my stock Actuator between 3550 and 4000 rpm.

 

thanks, will check

 

checked the actuator is not it.

I'm sorry, I forgot to clarify, the buzz in the cabin, outside nothing heard suspicious. and if I had a loud exhaust, probably would not notice rumble. I have the factory exhaust.

also noticed that the bolts on the valve cover untwisted, mileage less than 1k miles.

I am concerned, really do not want to disassemble the engine again, that would bring back the balancing shafts.

any ideas? thanks

 

The valve cover bolts becoming loose is probably due to the gasket compressing. Just gently retorque them. You may have to do this again later.

 

That AMS balance shaft is the most retarded part they make. The stubby shaft does support the oil pump gear when it comes out of the back of the case. Not to mention the gears are held concentric in the case from the oil pressure anyway (just like a crank journal in a bearing). The only damage you'll see from the front case is when it picks up dirt/debris because the pump is before the filter.

The whole idea of deleting your balance shaft is not only for reducing rotating mass but most importantly to get rid of a moving part that spins 2x that of the crank and heats the oil even more when riding on the bs bearing.

 

That's a great theory for street driven cars, but when you're racing and oil pressure drops way low during prolonged right-hand turns, then it is possible to damage the gears and this is where a solution like the AMS kit comes into play.

l8r)

 

Yes - I recently built a 2L motor and removed the shafts - and at about 4000 there is a distinct harmonic vibration - even with a fluid dampr its still there...

.

 

That's what dry sump systems are for

Also gears don't take the damage it's the aluminum case that would

 

In Evo8 is it possible to remove balance shaft without remove engine form car ? or install stub shaft ?

 

^Effectively no.

Ya I have a buzz right about 4k after BS removal. The balance shafts are designed specifically to reduce the harmonic effects related to i4 NVH no matter how well balanced the motor is.

 

those long shaft eliminator kits are an accident waiting to happen ,get rid