My friends M3 3.0 revs up to 9000RPM. And he is doing this daily. Now his harmonic balancer (vibration damper) - thing that is used by crank position sensor to read data gone bad. It started cracking and falling apart.

I have only seen Unorthodox making such things for US-M3, but they don't fit his car, and they are not dampered. He is using lightened flywheel, so it's scary to have non-dampered balancer.

E46 M3's have no crank position sensor at harmonic balancer, so it would not go.

Any suggestions?

revs to 9000rpm daily on a stock motor ?

No, it's not stock. It have a bunch of mods and it runs good at 9000RPM and even higher. Except this balancer falling apart =(

what mods does it have Mr Borat?

I don't know much details about this stuff, but I can ask my friend if somebody's interested. Just ask me. I have listed only engine mods here. Some of them haven't been installed yet.

- DBillas camshafts
- DBillas software (no rev limit)
- Bigger diameter valves
- Valve plates, lightened
- Valve springs
- Valve pushers, lightened
- Lash caps
- Crankshaft bearing shells, enforced
- Injectors 440cc
- Supersprint full racing exhaust, no cats, no resonators
- Carbon fiber intake manifold


PS: My name is not Borat, sorry =)

At such I high RPM the ballancer will create a lot of heat. I recomend cooling it with a duct of sorts. Also You can easilly get the ballancer from the dealer. Just make sure they order from the euro catalog.

I think it can't overheat much, because it is always cooled by radiator fan.

I think it can't overheat much, because it is always cooled by radiator fan.

that is generally blowing hot air.

Thanks for the input, Wiseguy. We'll try to put some temporary ducts and see if it helps.

Btw, I see some people have put S54 crank pulley. We have underdrive pulleys on the car, except crank one. Are there any issues with S54 crank pulley? Is it lighter or just underdrives? I cannot find a topic about it in Euro section.

just smaller, so it underdrives

just smaller, so it underdrives

basically, it doesnt come with the ballancer though, so it wont solve your problems.

S54 harmonic balancers are quite different, and don't have the timing set up since that is on the crank for S54

S50B32 and S50B30 HB are different part numbers.

The actual pulleys that are on the front of the engine can be changed with relative impunity. Of course, trial and error will determine if you end up underdriving an alternator or PS pump or waterpump "too much"

I'm sure smarter people than I could do the math and tell you what you need, but even then, the individual characteristics of your car will determine your needs. (ie race engine vs street engine, added or deleted electric loads etc)

If the OP has a 3.0 liter engine thats been fitted with a 3.2 crank to stroke it (very possible) they may have neglected to purchase the proper HB for that crank, and SHOULD do so...ie the S50B32 HB.

Alex.

I don't think the B32 crank will sustain 9k RPM, no? Even then, no balancer is going to take that abuse and stay together for long. Tell your friend to get a new balancer and put cooling ducts blowing air onto it. The crankshaft torsional vibrations flex the rubber in the balancer, thereby generating heat. Get some cool air (not air off the radiator) blowing up to the balancer and it may last a bit longer. Still, 9k RPM is not going to allow the stock unit to last long.

I don't think the B32 crank will sustain 9k RPM, no? Even then, no balancer is going to take that abuse and stay together for long. Tell your friend to get a new balancer and put cooling ducts blowing air onto it. The crankshaft torsional vibrations flex the rubber in the balancer, thereby generating heat. Get some cool air (not air off the radiator) blowing up to the balancer and it may last a bit longer. Still, 9k RPM is not going to allow the stock unit to last long.

Agreed, the cooler you are able to keep it, the higher rpm the HB will be able to withstand.