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Author Topic: Valve spring at 8500 rpm.  (Read 446 times)

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482supersnake

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Valve spring at 8500 rpm.
« on: February 07, 2024, 03:44:56 PM »
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jayb

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Re: Valve spring at 8500 rpm.
« Reply #1 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...
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Jay Brown
- 1969 Mach 1, Drag Week 2005 Winner NA/BB, 511" FE (10.60s @ 129); Drag Week 2007 Runner-Up PA/BB, 490" Supercharged FE (9.35 @ 151)
- 1964 Ford Galaxie, Drag Week 2009 Winner Modified NA (9.50s @ 143), 585" SOHC
- 1969 Shelby Clone, Drag Week 2015 Winner Modified NA (Average 8.98 @ 149), 585" SOHC

   

Barry_R

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Re: Valve spring at 8500 rpm.
« Reply #2 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.
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