Intake valve seat loose!
03-18-2013, 09:56 PM
#5
Race Car
Shaved the head too far and too thin of deck surface is my and another builders opinion.
It broke right in half.
I can't say conclusively that it Wasn't just age and fatigue though.
It broke right in half.
I can't say conclusively that it Wasn't just age and fatigue though.
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03-18-2013, 10:06 PM
#8
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03-19-2013, 12:15 PM
#10
Did you consider valve bounce? If I remember right, you run a custom cam grind. Could be that the springs are not up to the task and the seat just got hammered by the valve.
Video for reference to what I mean. Jump to around 2:45.
Video for reference to what I mean. Jump to around 2:45.
03-19-2013, 01:41 PM
#11
Race Car
The cam currently used was a stock part. I did run a custom cam for about two weeks. That was thousands of miles ago though. I understand what you are saying though. I did set the seat pressure a little higher when we did this head. That was a few years ago. It had since been used a few times.
I'm still leaning towards fatigue and that it was just milled too much.
It was initially built for a high compression engine.
In hindsight, I should have just used the stock head until I was done with the big valve head. But.....I was greedy for power and it was sitting on the shelf ready to go.
I'm still leaning towards fatigue and that it was just milled too much.
It was initially built for a high compression engine.
In hindsight, I should have just used the stock head until I was done with the big valve head. But.....I was greedy for power and it was sitting on the shelf ready to go.