LSX Main and Rod bearing clearances with forged parts
10-03-2021, 04:40 PM
#21
Managed to borrow a nice Mitutoyo digital micrometer and an analogue bore gauge. After working out the readings on the mains and rod bearings, the plastigage was only around .002 / .003 off (wow not bad for something so cheap). We did it twice and more or less then same thing :/
So does this crank need to be machined?? It is the Summit LS Pro forged crank for LS3 that I was told would work in the LSX block just like most of the other stuff.
Here is link to the crank I am using : https://www.summitracing.com/parts/sum-180ls362258x
The main bearings are King MB5013XPC : https://www.summitracing.com/parts/kgb-mb5013xpc
These are the rod bearings King CR807XPNC : https://www.summitracing.com/parts/kgb-cr807xpnc
Let me know if I'm doing something wrong here. Thanks.
* Update : After some digging, I somehow have a feeling these are the wrong bearings!
So does this crank need to be machined?? It is the Summit LS Pro forged crank for LS3 that I was told would work in the LSX block just like most of the other stuff.
Here is link to the crank I am using : https://www.summitracing.com/parts/sum-180ls362258x
The main bearings are King MB5013XPC : https://www.summitracing.com/parts/kgb-mb5013xpc
These are the rod bearings King CR807XPNC : https://www.summitracing.com/parts/kgb-cr807xpnc
Let me know if I'm doing something wrong here. Thanks.
* Update : After some digging, I somehow have a feeling these are the wrong bearings!
Edit: Missed a "0"
Last edited by 93Z2871805; 10-03-2021 at 08:18 PM.
10-03-2021, 08:13 PM
#22
When I built my engine I ordered about 4 sets of bearings from different manufacturers. The coated Clevites are the ones that gave me the proper clearance.( ms2199hxk)
If you’re running .00183 with the gauge and standard bearings you might need to mix and match a +.001 and a standard to give you a .0005 increase in clearance for a .00233
if you mix and match bearings keep the bearings shells the same on the halves. All caps get the same bearing or the block gets all the same bearing. A coated +.001 might increase the bearings clearance less the the .001
Make sure you are wiping down the back side of the bearings, caps and block bearing surface with acetone. Also they shouldn’t have any oil on them. +.001 oil clearance kings coated mains
MB5013XPSTDX
+.001 rod king coated
CR807XPNSTDX
If you’re running .00183 with the gauge and standard bearings you might need to mix and match a +.001 and a standard to give you a .0005 increase in clearance for a .00233
if you mix and match bearings keep the bearings shells the same on the halves. All caps get the same bearing or the block gets all the same bearing. A coated +.001 might increase the bearings clearance less the the .001
Make sure you are wiping down the back side of the bearings, caps and block bearing surface with acetone. Also they shouldn’t have any oil on them. +.001 oil clearance kings coated mains
MB5013XPSTDX
+.001 rod king coated
CR807XPNSTDX
Last edited by jasons69chevelle; 10-03-2021 at 08:29 PM.