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Author Topic: Minimum thickness of bottom of valve reliefs to piston bottom  (Read 554 times)

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winr1

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Minimum thickness of bottom of valve reliefs to piston bottom
« on: January 27, 2024, 10:21:23 PM »
Read on more than a few sites but wanted yalls opinion

Thinest point of valve reliefs to bottom of pistons

Forged pistons.... around 10.3/10.5 .... naturally aspirated


Ricky.
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jayb

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Re: Minimum thickness of bottom of valve reliefs to piston bottom
« Reply #1 on: January 28, 2024, 10:21:47 AM »
I've measured a few of my CP pistons, they are always at about 0.200".
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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: Minimum thickness of bottom of valve reliefs to piston bottom
« Reply #2 on: January 29, 2024, 08:26:22 AM »
You can get quite a bit thinner in "small areas" on N/A applications. 
I've seen .130 at the point - I've always heard guidance of .160-.170. 
Problem is that small areas can become big areas if they open up from a bad tune or...way better to be safe.
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winr1

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Re: Minimum thickness of bottom of valve reliefs to piston bottom
« Reply #3 on: January 30, 2024, 12:51:25 AM »
Many thanks yall  :)


Ricky.
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