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Originally Posted by budski
Quote:
Originally Posted by BMRLVR
I agree with most of what is said in this thread with the exception of the recommendation to stay with the 10W60. I honestly think that the 10W60 may be a contributing factor to the bearing wear on daily driven cars. Every time the car is started with 10W60 oil that is 150F or less the bearings are starved for oil on the initial startup and until operating temperature is reached. A lighter oil isn't a fix but it is definitely a way to prolong the life of the bearings!
As for replacing bearings as a maintenance item, I think that is ludicrous. If you have no bearing issues with your engines, leave them alone, if you do have issues, take the time to do the repair right by sending the crank out and having the journals sized. This way you won't have to replace bearings sometime in the future since the actual problem causing the wear would be corrected!
My $0.02!
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So I read the epic S85 bearing thread and called multiple shops east of the Mississippi and brought up the thoughts/points, including yours, that intuitively make complete sense. My car is currently at iND getting a blower installed and wanted to see if it would be worth shipping it to one of the known speed shops outside of Cali.
The general concensus was that just increasing the distance between the rods and rod bearings would not necessarily be "a cure".
As much as it sucks money wise, the conclusion I gathered from those multiple engine builders is that if a particular engine has a rod bearing issue then we have two options. A) Build the engine and possibly encounter seperate issues ($12k-$20k) or B) Replace the rod bearings as a regular maintenance item every 50-80k miles {$3-$4k)
I currently have just under 14k miles and my personal game plan is to send Blackstone Labs a sample at my next oil change, drive 5-7.5k miles, send it in again, then determine if I have an issue. I know that having only two data points isn't statistically good enough to determine a trend in metal content but that thread scared the $hit out of me! |
No offence to the shops you spoke to since I don't know who they are, but, what they told you is laughable! 0.001" is just plain too tight for a rod bearing, especially in a high revving engine running a 60W oil. Yes additional clearance "will" fix the bearing issue, plain and simple! Forget talking to speed shops........ Call a machine shop that builds engine and see what they tell you! Many shops/people work on engines, but that don't make them qualified as engine builders.
Clearances are clearances and clearance recommendations on engines have not changed in a long time. Yes, some minute differences do exist depending on the service requirements and some race teams are going a little tighter now but they aren't cutting clearance recommendations in half! They are reducing clearance by say 0.0005" or 0.00075" which still puts them in a safe range. If the S65 had even 0.0015" on the rods I probably wouldn't worry, but with 0.001" I am not comfortable.