can someone explain this too me please,

was on concept Z's website, and some are asking for grade and not others...?

 

 

do i still need grades if i fit forged pistons and rods, along with ACL race(heavy duty) bearings? and what does the extra oil clearance mean?

nobody know?

 

is the grading irrelevant on heavy duty bearings

sorry m8 i forgot to respond to this

 

 

Standard crank untouched u need STD ALC bearings

 

if the crank as been reground and polished then machine shop will need the grades of bearings

and u buy according to them ... thats what the 0.025 is and so on ..

 

the extra oil clearance is for high rpm loads and better oil flow ( not as close fit to the bearing )

sorry m8 i forgot to respond to this

 

 

Standard crank untouched u need STD ALC bearings

 

if the crank as been reground and polished then machine shop will need the grades of bearings

and u buy according to them ... thats what the 0.025 is and so on ..

 

the extra oil clearance is for high rpm loads and better oil flow ( not as close fit to the bearing )

 

 

thanks so if i have ACL bearing then STD size will do. is it worth going for extra oil clearance in a ~500bhp engine?

 

didn't understand why Nissan bearings had different STD grades and ACL didn't

nissan was a little anal when it came to that ..

 

before buying your

 

piston

bearings

head gaskets

 

you need to find out what damage u may have as

 

damage to bores will need next size up 87.5mm

damage/pick up on crack will need a reground thicker bearings 0.025

heads skimming will need thicker gaskets .. cometic upto 7tho=051 8tho>11=053's

thanks. really helpful info.

 

waiting to hear from gonzo what his heads were skimmed to, but if its unknown can use my current heads that haven't been.

 

already got the machine shop on board, so will see what the engines like when its out.