hi, ust built my new bottom end of my sapp coss and i've noticed a slight move ment of the big end not only side to side but a tiny bit up and down is this normal?? cheers fo any elp

 

Errr no

 

In a word NO, what is the clearance?

 

after a closer inspection it is really just 2 of them with alot of movement i have just fitted it with standard bearings the crankshaft is mint. could the problem lie with the conrods or the bolts even though the bolts are new??

 

has the crank been polished/ground at all? bolts wouldnt make a difference mate if u have torqued em up properly

 

nope the crank is standard

 

Is it worn?

 

did standard bearings come out ?

 

the crank is not worn at all it is in mint con out of a low mileage car, but the engine that the conrods came out of was worn and the crank was knackerd.
i have had the crank checked by the local engineering firm and the said it is perfect and in standard form, cheers

 

did you use the rod caps and main caps that match the correct rod's or block if you have mixed them then you've just found your problem

 

yes the conrods caps and main caps are from the same block, the only new part is the crank.
i'm going to styrip it all down again and see what i can find, cheers

 

problem solved thank god, took it all to bits ,buuilt it back up over night and now it's sweet maybe there was some crap inbetween the rods and the caps who knows, cheers

 

If you had torqued the rod bolts i'm sure you are aware you needed to use new ones