Re: The BIG project thread
Posted: Mon Apr 09, 2012 1:27 am
Just my opinion but I think the support on that crank is a very bad idea.
The crank shaft isnt desighnd to take the weight better to let the engine sag on the light weight engine stand it will bow and sag but it will support the weight.
My point is a crank shaft will bend very easily more easily than most guys think too.
Most guys think that to straiten a crank shaft you need to use a press or Machine turn it strait the truth is REAL crank shaft straitning is done with a hammer on V blocks with a dial indicator.
Also never Lay a crank down on its side always stand them up or hang them they will bend easily.
You cant see it looking at it you have too put it in the block or V blocks and check the run out at each Main.
Usually if its within .002" I dont get too excited of course your looking for less than .002 but its hard to get one that strait and keep it strait especialy if you have to transport it from machine shop to home.
But supporting the engine on the front throw deffinatly a no no
The crank shaft isnt desighnd to take the weight better to let the engine sag on the light weight engine stand it will bow and sag but it will support the weight.
My point is a crank shaft will bend very easily more easily than most guys think too.
Most guys think that to straiten a crank shaft you need to use a press or Machine turn it strait the truth is REAL crank shaft straitning is done with a hammer on V blocks with a dial indicator.
Also never Lay a crank down on its side always stand them up or hang them they will bend easily.
You cant see it looking at it you have too put it in the block or V blocks and check the run out at each Main.
Usually if its within .002" I dont get too excited of course your looking for less than .002 but its hard to get one that strait and keep it strait especialy if you have to transport it from machine shop to home.
But supporting the engine on the front throw deffinatly a no no