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FE Power Forums => Non-FE Discussion Forum => Topic started by: 482supersnake on February 07, 2024, 03:44:56 PM

Title: Valve spring at 8500 rpm.
Post by: 482supersnake on February 07, 2024, 03:44:56 PM

https://www.instagram.com/reel/C1Kk-J1uov2/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==

Title: Re: Valve spring at 8500 rpm.
Post by: jayb on February 07, 2024, 04:16:45 PM

What's really interesting is how much the valve stem itself moves around.  Certainly the head end of the valve is doing the same thing; argues for a lot of radial clearance from the valve to the piston eyebrows...

Title: Re: Valve spring at 8500 rpm.
Post by: Barry_R on February 09, 2024, 06:13:01 AM

I have had an engine where we had a measured +.020 radial clearance between an exhaust valve and the cylinder wall - and had witness marks on the wall after running.