[Shotimes] Rod Bearing Change @190K miles

[Donald Mallinson]

I would agree with the lugging theory, sounds good.

I just replaced the bearings in my '89 with 180,000 miles, and only the 
top ones showed any real wear, a small 3/4" oval still in the 
silver/grey material.   the car had Valvoline 10-30 for the first 45,000 
miles and Synthetic (mostly Amsoil 0-30 or 5-30) for the rest of its 
life.  Ran the 0-30 for 25,000 miles between changes for a few years.  
So much for having to change every 3000 miles!   :)   The car got puit 
on the track quite a bit the last 30,000 or so miles.

Don Mallinson

bjshov8@comcast.net wrote:

>There has been speculation that the ATX does not allow the engine to "lug", and therefore reduces wear on the bearings.  With an MTX you can run the engine under load at real low rpm's which is what is theoretically bad for the bearings.
>
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>> Just changed the connecting rod bearings at 190K miles on my wife's 1993 ATX.
>>I think it was a waste of time! The bearings had very little wear. I just
>>could not believe how clean the engine is! Only had a small oval patch of
>>copper showing, maybe 1.5 or 2 inches long. Not even all the way across the
>>bearing shell. We have had this car since 78K miles and have only used Mobil 1
>>synthetic oil, changed at 5K intervals. The new rod bearings checked with
>>plastiguage were right in the middle of the factory clearance range.
>> Maybe the ATX SHO's can go without changing the rod bearings? Even up to and
>>over 200K miles?
>>    
>>
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