09-06-2022, 09:48 PM
(This post was last modified: 09-06-2022, 09:53 PM by David Stepney.)
Dennis, I am not sure that the slight amount of ovality in the conrod as a result of filing it would make a ha'peth's worth of difference.
1. The amount of ovality would be measured in a few thousands of an inch and it is not unknown for big ends to 'spread' a bit anyway.
2. When remetalling, the conrods would be checked and ,if required, rebored back to circular before the new metal was run in. The new bearing material would then be bored to suit the crank.
3. If the rods are filed, the resulting bearing would be slightly oval anyway, being wider side to side that top to bottom. It is the top to bottom clearance that is crucial to a quiet big end bearing.
4, The bearings shouldn't run that hot anyway, as they will be cooled by the oil. Seven engines in standard trim tend to rum cool anyway.
1. The amount of ovality would be measured in a few thousands of an inch and it is not unknown for big ends to 'spread' a bit anyway.
2. When remetalling, the conrods would be checked and ,if required, rebored back to circular before the new metal was run in. The new bearing material would then be bored to suit the crank.
3. If the rods are filed, the resulting bearing would be slightly oval anyway, being wider side to side that top to bottom. It is the top to bottom clearance that is crucial to a quiet big end bearing.
4, The bearings shouldn't run that hot anyway, as they will be cooled by the oil. Seven engines in standard trim tend to rum cool anyway.