So the second engine didn't have the cams? I've lost count of how many engines you've ruined on jack stands.That was the second engine's problem--piston material and piston to walk clearance not matched to the liner material. I'm talking here about why the first engine blew up with the vanos.
I see, thanks for clearing that up.@tradin1:
Both were in the car, Sparky. I need to ensure your new colleagues at GM know your nickname.
The cams were in both engines, but the second was vanos delete with timed cams, so the lack of pressure relief valves made no difference, Sparky.
The engine experienced catastrophic failure, with pistons hitting valves and cracking the heads and block. Was a near total loss.Hey Peter, I see you said you believe you found the problem with your first engine vanos failing, because of this pressure release valve. What exactly happened and what kind of damage did it cause because of this?? Reason I'm asking is I installed custom reground cams in mine which I dropped off at FS tuning about a month ago. I never knew about these relief valves and now its making me worry if the cams don't have them installed.
Just to be clear: My cams are not regrinds. They were custom made on a CNC machine from solid billet with special ramps to accommodate solid lifters. That is why my situation may be relatively unique: Most custom cams are just regrinds of the factory shafts and so likely have the valves installed in them from the get go and are not removed during the regrinding process.I wonder if the reground cams found for sale even had them removed in the first place?