machining for SBF rod botls?

[XFlow_Fairlane]

Hey Mike or others...

what is needed to be done to put your ARP rod bolts into a set of 200 rods? looking to beef up a set I have on the new motor.

 

[kirkallen143]

Nothing, they will install without any machining. Others will say they do, but my machinist had no problems.

Kirk

 

[XFlow_Fairlane]

is the "machining required" basicly having them recon'd with the new bolts put in....IE I can't just press them out/in at home and run them, theyneed the big end resized/trued?

 

[jahearne]

I just installed them on two motors, one an overhauled used motor and the other a brand new already assembled motor. No machining required.

I just popped the oil pan off, rotated the rod cap into place, loosed the original rod bolts, tapped them loose with the nut still on them and carefully fished the new APR rod bolts into place. The difficult part was keeping the rod bolt lined up properly while i tightened them because the bolt head is retangular and one side fits up against the rod. Careful that the rod bearing doesn't move when reassembling the rod cap and don't score the rod journal.

Recommend getting a rod bolt stretch gage or a torque wrench that reads low torch settings.

 

[falcon60]

The real problem with the good bolts arises when they are installed properly with a stretch gauge. The likely result is substantially higher torque and clamping force on the rod. Now,this is what we're after but the higher forces may well cause the bearing bore in the big end of the rod to egg a bit and reduce oil clearance enough to spin a bearing unless the rods are resized while the new bolts are tightened to spec. This doesn't happen every time but is a very real possibility. When replacing the bolts like jahearne did,I'd plastigauge the bearings in several places to be sure all was well.

Terry