Engine knocking after rebuild.
11-17-2009, 11:32 PM
#1
Engine knocking after rebuild. Ok, here is the story. I recently rebuilt my engine with all stock parts except I upgraded my 241s to 243s. The engine is running great. The oil is at 50PSI at idle and idle is good. Turns on everytime on the first try. I know LS1 have small knock on the upper part of the motor but mine is pretty loud. My brothers car is not as loud. Can this be fixed with a tune? What would be the correct fix?
11-18-2009, 02:07 PM
#4
Well since I did everything stock I figured I wouldnt have any clearance issues. I have seen before of a tuner that tuned everything right and made the engine stop tunning. I didnt mean to sound retarted like that. I will try to find that post. Once again everything is all stock.
11-18-2009, 04:53 PM
#5
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When you say "everything is stock" what do you mean? Did you put new bearings, rings, etc in? If so you should have everything clearanced/checked. You cant just take it apart, put new bearings in and throw it back together. There are a lot of parts moving real fast very close to each other. Things need to be precise.
11-18-2009, 11:48 PM
#6
I had my friend build it for me. He is a mechanic at a GM dealership and builds LSX motors all the time. Im going to take it back to him so he can listen to it. I just wanted to get some ideas of what can it be so that I can tell my friend what to look for.
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11-19-2009, 08:51 PM
#11
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Did you put new bolts in the main caps? If you reused the old ones, chances are they are streched... I have never reused a set without problem... You can make them work, but you have to put some brains into it. Most likely not your problem but it could be.
11-20-2009, 12:03 AM
#13
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is it chattering or knocking. valvetrain doesnt really knock. it chatters as there are a lot of moving parts. you pull the valve covers off and check for looseness around the rockers and what not. if its real loud. could have a bent pushrod, collapsed lifters, rockers not tightened just to name a few.
11-20-2009, 01:38 AM
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is it chattering or knocking. valvetrain doesnt really knock. it chatters as there are a lot of moving parts. you pull the valve covers off and check for looseness around the rockers and what not. if its real loud. could have a bent pushrod, collapsed lifters, rockers not tightened just to name a few.
