Why did my rockers break? 6 cylinder |
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Why did my rockers break? 6 cylinder |
David Stowers |
May 16 2022, 09:32 AM
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#1
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Member Group: Members Posts: 99 Joined: 28-June 12 From: UK Member No.: 14,613 Region Association: None |
Hi all,
All 3 exhaust rockers broke on one side (4,5,6) when I started my engine for the first rime after cam and rocker re grind. What’s the likely cause here folks? Thank you |
Luke M |
May 18 2022, 08:13 AM
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#2
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Senior Member Group: Members Posts: 1,389 Joined: 8-February 05 From: WNY Member No.: 3,574 Region Association: North East States |
Have you checked the valve to piston clearance ? This is a step you can't miss if you swap out cams. What engine size are you working with? E cams into a T engine?
Like stated above, it sounds like the valves hit the pistons. You may want to take a look at the pistons and valves. If the rockers broke more then likely a valve or piston maybe damaged as well. I've done cam timing on several 911 engines. By far the easiest method/tools I've found is by Stomski Racing. I use their digidix tools and I can get dead nuts results. https://www.stomskiracing.com/products/digidix If you're gonna just do this once the price of the tool may or may not be for you. I've used this tool on two engines and have one more to do. Watch the video on the link if you haven't already seen it. |
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