Modifying Engine Bearings
Modifying Engine Bearings
(OP)
We are building a destroked V6 by offset grinding the crank journals and having custom rods made. The new diameter of the journal is the same as another engine we work with often however the width of the rod is .200" less. If we wanted to use the bearings from that application, is there a good method to make the width appropriate? I would like to use the ACL H rated bearings which do not have the flash coating on them found on most bearings.
Thanks in advance,
Mike
Thanks in advance,
Mike





RE: Modifying Engine Bearings
Unfortunately i do it all the time
Turn & smooth down a piece of Timber to the journal size plus your (bearing clearance & add about .001" or so). Lay your bearings around this & use a small band clamp to firm them up lightly, it's just a matter of spinning off the bit you don't want, use coolant & take your time. Just debur & chamfer the cut on both sides & your done!
Leave a good step to butt the bearings up against for initial fitting & get the band clamp up as close to the cut as you can.
Hope this helps
RE: Modifying Engine Bearings
Thanks again
RE: Modifying Engine Bearings
RE: Modifying Engine Bearings
I would narrow the rod big end to the desired width before doing it with a bearing shell inserted.
Regards
pat pprimmer@acay.com.au
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RE: Modifying Engine Bearings
RE: Modifying Engine Bearings
One advantage of the lathe method is that it is easy to dedurr the cutt area. I often used abrasive impregnated bubber for the deburring.
Grinding soft material sounds like a drag.
Jonathan T. Schmidt
http://www.schmidtmotorworks.com