Jeep Strokers

I have a bit of an issue! I have just completed my first 4.6 stroker build with 90 renix block, and was in the process of trying to break motor in when I began to hear a bit of a bottom end knock at idle, Seems to decrease a bit upon acceleration. And the power isnt as anticipated. I am probably guessing that it is a rod bearing or piston. If anyone has any helpful hints or tips that can help to determine what the issue might be. I would highly appreciate it. I can give more info if needed to help with the process of elimination.

What is your oil pressure?

mudslinger wrote:I began to hear a bit of a bottom end knock at idle, Seems to decrease a bit upon acceleration.

It's more likely to be a main bearing. A worn rod bearing usually causes a louder knock when you load the engine. Either way it looks like you're gonna have to pull the oil pan and check all of the rod/main bearings.

Before you do anything check the flex plate to torque converter bolts.

My oil pressure shot up to 25 psi when it first started then then began to drop to no pressure. I installed new main and rod bearings and torqued everything down to spec. I am a bit confused on how this can happen. Do you think I installed a bad bearing somewhere? Would there be plenty of scarring to indicate what bearing or bearings are crap? Guessing that the motor has only 30 miles

You could just have simply installed the wrong undersize bearings and have too much clearance.

Did you plastigauge the bearings to see the clearance?

No unfortunately I did not plastigauge before install. I guess I just trusted machine shop to have ordered the right bearings.I just pulled rod bearings out today and it looks like there is definate scarring so I will proceed to pulling crank