Valve Tulipping

[Mike Pearson]

Originally Posted by voltdr

We agree that titanium is better but, according to the cylinder head specialists Brodix, they aren't required. Bordix is even at a loss as to what happened.The real question I had is what caused the valve to tulip?
Dan

Probably just a couple of bad valves. I have had bad luck lately with Manley SS exhaust valves. I have had 2 exhaust valves drop the heads off and destroy 2 good engines in the past couple of years. The last set only had about 75 runs on then. These are small diameter valves too. I guess I will start to change the valves at 50 runs from now on. The Manley stuff does not seem to be as good as it used to be.

[Rich Biebel]

Detonation causes tuliped intake valves.....

It also can show up as top ring land excessive wear and obvious damage to the pistons above the top ring.

Bad gas, to much timing.....some sort of timing malfunction during a run that allows timing to advance with RPM....

I had a digital box once that advanced the timing to over 70 degrees once the engine started.....Holley Annihilator.......!!! Took me 3 tries to get one of those boxes that worked.....

[voltdr]

Thanks Rich. When I put it back together I will check the timing again and see if it changes as the RPMs increase. I also added the ability to move my O2 sensors (2) to each cylinder to keep better track of the mixture.
Dan