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Re: 915 and 516 CC's
[Re: Sport440]
#1604300
04/09/14 12:11 AM
04/09/14 12:11 AM
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Joined: Feb 2005
Posts: 4,333 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,333
Prospect, PA
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How much do you think the seat and valve combined are ground on a wore out set of heads?
Last edited by BSB67; 04/09/14 12:26 AM.
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Re: 915 and 516 CC's
[Re: Sport440]
#1604303
04/09/14 08:34 AM
04/09/14 08:34 AM
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Joined: Feb 2005
Posts: 4,333 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,333
Prospect, PA
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One of us is doing the math wrong. I too would guess 0.010" to 0.020" 0.020" drop of both valves is almost 2 cc. If my math is wrong, please let me know. Surface area of the entire valve verses the notch is not a good comparison. My point is that if someone is getting 84 cc on a set of 915s, it might be be that it has had one or two NAPA valve grinds. Maybe just factory variability...I don't know
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Re: 915 and 516 CC's
[Re: elmor353]
#1604304
04/09/14 11:53 AM
04/09/14 11:53 AM
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Joined: Jan 2003
Posts: 4,395 The Pale Blue Dot
Skeptic
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master
Joined: Jan 2003
Posts: 4,395
The Pale Blue Dot
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Quote:
Can anyone tell me how many cc's the combustion chambers are on these heads?
The sets I've measured were between 80-82 cc
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Re: 915 and 516 CC's
[Re: BSB67]
#1604305
04/09/14 01:50 PM
04/09/14 01:50 PM
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Joined: Jan 2003
Posts: 6,591 Canton, Ohio
Sport440
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Quote:
One of us is doing the math wrong. I too would guess 0.010" to 0.020"
0.020" drop of both valves is almost 2 cc. If my math is wrong, please let me know.
No your Math is correct, decided to check it myself instead of guesstimate.
At 0.010 on both a 2.14 and 1.81 valve = 1.011 cc
At 0.020 on both double that = 2.022 cc
My eyeball measurement wasnt very correct
Thanks for the correction
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