just blew it up!!!
Thread Starter
Racer
Joined: Nov 2007
Posts: 350
Likes: 0
From: coon rapids mn
the lower end was not touched. the motor has been running for nearly three years don't know history of the motor. she always ran strong just not strong enough so this winter put dart heads, gm hot cam(1990 oem roller block) eddy rpm intake. that really woke her up but playing with her today must of over revved it? it was a L98 motor out of a z28. dont hear anything distinct at idle but somethings knocking when revved!
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Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Lots of other things to check before condemning the motor. If you have an auto, check the torque converter bolts,bad mechanical fuel pump can knock, pull the valve covers and see if you can see anything there.
Thread Starter
Racer
Joined: Nov 2007
Posts: 350
Likes: 0
From: coon rapids mn
torque converter bolts tight. valve covers off everything looks normal. i took the belt off to elimanate the water pump. fuel pump??? i'll look in to that before i pull it tommorow but it sounds more terminal than that.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
I usually start the engine and then shut it off to get fuel in the carb,then I remove the 2 bolts holding the pump , leave lines attached,pull the pump out a little and drop the rod and then restart and listen.
Racer
Joined: Oct 2009
Posts: 441
Likes: 2
From: San Antonio TX
quick easy check ........pull the oil filter and pour thru a paint strainer / filter , look for shavings or babbit material. or use a white towel to strain thru...put a extendable magnet into the filter ....look for any metal particles
Melting Slicks
Joined: Dec 2000
Posts: 3,363
Likes: 303
From: Lansdale 19446 PA
2024 C3 of the Year Finalist- Unmodified
St. Jude Donor '10-'11, '15, '19
While running - pull off one spark plug wire at a time - if the knocking stops on a specific cylinder - you found your problem - Rod bearing.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN
Did you even check the condition of the rod bearings before you put new heads, etc. on the car? If the motor had lots of miles on it, the added HP just help you wear it out really quickly. You need to pull the idler arm off the frame and drop the oil pan...then see how some of the rod bearings look.
