I was told crank is oval (0.04mm) so it need's to be ground. Does that mean that I have to order 0.25mm undersized bearings?
If so, how do they know how much to grind away and what diameter to go for? I'm sure if I don't check it the shop would grind the crank so clearances would be anywhere between 0.001-0.500mm... So what do I have to tell them?Thanx!
Bearings help needed...
Re: (180fan)
And what will it tell to me? How do I calculate the diameter they need to make?180fan wrote:ask them how much they're going to grind
Re: (180fan)
So I need to force them to take into account bearings caps grades and calculate diameters based on that?180fan wrote:ask them how much they're going to grind and have them size bearings for you.
You're getting your crank ground. You can try using grades, but chances are you should have them size it. If the bearings are too tight that you choose based on grade, you'll break something or spin a bearing, or if they're too loose, you'll get more piston rattle and have a motor with a short life. Have them size the bearings and also the line bore for the block, and check over the diameters of the large part of the rods.
If your crank shop is going to do what my crank shop did, they're going to make all the journals the same size, so the grade system will no longer apply to you unless you mic em all out and measure the line bore and then choose a bearing. Again, unless you've got access to a good set of 1-2" micrometers (inside and outside) I would not recommend this.
If your crank shop is going to do what my crank shop did, they're going to make all the journals the same size, so the grade system will no longer apply to you unless you mic em all out and measure the line bore and then choose a bearing. Again, unless you've got access to a good set of 1-2" micrometers (inside and outside) I would not recommend this.