motor go boom

[Len Sabatine]

    Mike,
    It's surprising how many times the Rod BE Size and TIR is overlooked, New
    rod bearings get popped in. It's a crap shoot at best. You'd be amazed 
, how many
    "New" Rods that need to be resized to put them into tolerance and 
promote long
     bearing [ engine] life. Some folks use Velcro on engine mounts too.
     Len
>In a message dated 3/14/01 8:37:50 PM Eastern Standard Time,
>sabatine at epix.net writes:
>
> >   If you decide to tear down, Have a competent engine machinist check the
> >       big end bores of any rods that didn't turn a bearing, If any of them
> >  are out of
> >       round on a 30 - 45 d angle from vertical , your engine was 
> detonating.
> >       Rod Big end size needs to be 2.2250 and Round with up to . 0005 to
>.001
> >       larger directly on the parting lines, being acceptable. This is the
>
>I've seen bearing wear in the same area (35-40d from verticle)
>  from detonation and never thought to check the big end..
>I put new bearings in and reassembled the engine.
>  I will look next time.  Thanks Len.
>Mike V
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