Quote:
Originally Posted by JSchmitz
Yes, I think I understand it pretty well. Piston slap is bad. It causes ring wear, sounds bad, etc. The offset is their help eliminate this. Are you saying that his knock isn't from improper assembly?
I know that my dad owned a 1969 Chevy pickup. He had the engine rebuilt. The guy put the pistons in backward. Guess what, it had a strange knock.
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[QUOTE=JSchmitz;6469943] I would say that the piston installation didn't break any laws of physics. They are merely complying with the laws. The laws dictate that the pressures and angles act on the pistons in a certain manner. The engineers that designed the pistons understood this better than anyone in this discussion. They designed an offset to minimize unwanted movements of the pistons and maximize efficiency. Choosing to go against this is most likely causing the noises in this engine.
Mikes Reply:
We are putting the Trans. back to the Engine now, I will let you know when we run the Motor. I am not holding my breath though, that this noise has disappeared. Perhaps the noise was always there, I just did not hear it until the Heads were remanufactured, causing new Harmonics resonance within this Engine.
The Pistons are backwards except for #2, Why. The racers reversed the Pistons for a reason, we know why.
The #6 Rod is backward, and maybe more. Not good.
The Pictures in the 1967 Pontiac service Manual are confusing at best.
People made mistakes rebuilding these engines over the years and it seems that I have one of them.
Let's see what happens when we get the Vehicle running again.
I bought the Stethoscope, with the long rod on the end, we can now listen better, to isolate said noise, if it is still there.
Mike out, thank you all for your help.
Also, to find out that my Pistons are closer to TDC because they are installed backwards, is ironic since I spent all that time with the degree wheel just to find true TDC.