Re: Just a few RPMs from total destruction

Posted by Tim Cole On 2013/8/2 13:46:47

Nothing then that can't be programmed into a CNC and turned out in tool steel. However, if the diameter of those springs is so special they probably should be changed out to smaller diameter anyway because of frequency problems.

The last one I dinked around with, the machine shop didn't say anything about those springs being so special.

The failure at high rpms is probably the pistons hitting the valves and when the spring catches up it hammers on the retainers.

That motor was not the worst V-8 that ever came out, but as a high performance toy there are better choices.

Oh, and while you're at it throw away those heavy rocker arms because they may also be causing a problem as well.
I knew this old timer - Charlie Clancy - and his kids learned to drive on his Caddy 12 Phaeton. Naturally they tried to see how fast it would go and broke a rocker arm.
Nothing happened to the motor because it had cast iron pistons (it wasn't an interference engine anyway).