JohnBradley

iTrader: (30)

Sonny feels it was just tired. I tuned it on 89 octane and stock knock control and it has been good this long.

AdamAndEvo

Don't be a troll Harry. Not all of us have evos with 60k on them.

Noe18

iTrader: (4)

any vids?

AdamAndEvo

Sorry no vids bud. Pretty sure my oil pump dudnt appreciate me smacking the 8k limiter. And she had 134,000 miles on her. It is at english getting a 2.3 build as we speak. Aaron is the man i drive 8hrs for him to tune my car. it never knocked in the last 3 tunes. Not even once. Then it just went crazy. So im confident it was mine or my motors fault. im praying my turbo didnt die too. Cant wait to het her back and see what shes capable of.

AdamAndEvo

Verdict is in. Oil pump died. Wiped out two bearings. Hoping my fp red isnt dead also.

mrfred

iTrader: (50)

That's a little scary. How does an oil pump die?

JohnBradley

iTrader: (30)

M,

Jeff pulled it apart yesterday and it had siezed a balance shaft bearing on the oil pump. Engine starved as a result but the turbo seems to be fine. Not tune related as the dude in quotes above was trying to insinuate.

mrfred

iTrader: (50)

Thanks. Totally understood on it not being tune related. Rather fascinating to see this mechanical failure. Do BS bearings occasionally do this for unknown reasons, or perhaps there is a typical precursor event prior to the bearing seizing? Oil starvation due to acceleration or cornering?

JohnBradley

iTrader: (30)

Turning twice engine speed in a small diameter journal bearing has been the accepted cause. There was talk amongst various "keepers of the balance shaft" about doing high speed roller bearings and modding the block. Mitsubishi's solution for BS problems seems to be the best to date though.

mrfred

iTrader: (50)

Since I have elected to keep my BS's, the inevitability aspect is a bit unnerving. But isn't the particular bearing being discussed one that stays even with a BS delete? Mitsu's solution is?

JohnBradley

iTrader: (30)

Mitsu's solution in the 4G61 was the stub shaft to drive the oil pump and eliminate the balance shafts.

AdamAndEvo

Eeek. I was on the fence about keeping my BS before this incident. I had read jacks why to keep you bs article and was of the school of thought it somehow helped. But honesty i wish i would have deleted it when i did my tbelt. It would have saved me quite a bit of cash. Besides the more i read, i realize many 4 cylinders dont ever use them. IE honda. As long as the rotsting assembly is balanced it should be minimal vibration. (From what i read).

JohnBradley

iTrader: (30)

I really dont feel its the type of vibration that would put your foot to sleep. As many cars as I see come in with the BS out of phase anyway it must be difficult to time I cannot see any practical reason to keep it in the car since 90% of jumped timing tracks back to spun or seized balance shaft bearings.

06MREvo

iTrader: (90)

Interesting, didn't know the Colts, etc had that setup!

batty200

iTrader: (3)

Balance shafts are the devil.