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piston top material removal/balancing Q #2538313
08/18/18 11:50 PM
08/18/18 11:50 PM
Joined: Nov 2003
Posts: 36,039
Lincoln Nebraska
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RapidRobert Offline OP
Circle Track
RapidRobert  Offline OP
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Joined: Nov 2003
Posts: 36,039
Lincoln Nebraska
I'm thinking I may need to cut an intake valve notch in my flat top pistons. According to my figuring a notch 2.02 dia/.039" deep will remove 1.97 CC's with a weight of that material being 5.32 grams. Will this 5.32 gram reduction mess up my balance? 360 race app cast crank ext balance cast pistons. Bobweight 2189. piston (each) 617. pin 153. rings (set) 58. rod (recip) 223. rod (rotating) 1032 (a pair). rod bearings (pair) 102. oil (estimated) 4 grams. thank you for your time.


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Re: piston top material removal/balancing Q [Re: RapidRobert] #2538320
08/19/18 12:09 AM
08/19/18 12:09 AM
Joined: Jan 2003
Posts: 1,908
Nebraska
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4406bbl Offline
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4406bbl  Offline
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Posts: 1,908
Nebraska
No worries, you will only likely be taking an eyebrow out of the piston, so betting less than a gram per piston for balance purposes.

Re: piston top material removal/balancing Q [Re: 4406bbl] #2538330
08/19/18 12:25 AM
08/19/18 12:25 AM
Joined: Nov 2003
Posts: 36,039
Lincoln Nebraska
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RapidRobert Offline OP
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RapidRobert  Offline OP
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Joined: Nov 2003
Posts: 36,039
Lincoln Nebraska
I missed that! I was calculating a "cylinder" .039" deep and 2.02" dia when in actuality with the 18 deg angle it WILL be eyebrow. Thank you, I owe ya one! Sometimes it ain't WHAT you know it is WHO you know. EDIT the Sealed Power H405P (I might be off on that #), have 4 notches for a listed total of 10CC & I have set somewhere so I will find em for a visual.

Last edited by RapidRobert; 08/19/18 01:16 AM.

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