What's the cubic inches on a .030 over 289?
06-20-2007, 03:11 PM
#22
2nd Gear Member
Join Date: Mar 2006
Location:
Posts: 490
RE: What the cubic inches on a .30 over 289?
ORIGINAL: 66GTKFB
Why don't you give it a try? No names, just grades. Seven posters, you included, and one repeat.
Jim
Why don't you give it a try? No names, just grades. Seven posters, you included, and one repeat.
Jim
JBradley500 also has a correct formula as 0.7854 = PI/4, so this constant includes the conversion of diameter into radius.
06-20-2007, 05:30 PM
#25
3rd Gear Member
Join Date: Feb 2005
Location: UPSTATE NEW YORK
Posts: 614
RE: What the cubic inches on a .30 over 289?
i always use .7854 because i think of a circle and a square with the same diameter...
if both were 4" diameters then the circles area would be 4*pi=12.56... and the square would be 4*4=16... 12.56.../16=.7854
this means a circle has 78.54% of the area of a square if they both had the same diameter, and since a piston is in a circle shape it only makes sence.
this is the reason the formula makes sence and i use it because it makes sence to me lol
if both were 4" diameters then the circles area would be 4*pi=12.56... and the square would be 4*4=16... 12.56.../16=.7854
this means a circle has 78.54% of the area of a square if they both had the same diameter, and since a piston is in a circle shape it only makes sence.
this is the reason the formula makes sence and i use it because it makes sence to me lol
06-20-2007, 05:47 PM
#26
I ♥ Acer
Join Date: Oct 2004
Location:
Posts: 17,565
RE: What the cubic inches on a .30 over 289?
ORIGINAL: 66GTKFB
The grades are in after my initial post with the formula:
3 get an 'A'
1 gets a 'B'
1 gets a 'D'
2 get an 'F'
There was one repeat entry. As I said - 'Remember all that crap they taught you in school', evidently not.
Comments Glen?
Jim
The grades are in after my initial post with the formula:
3 get an 'A'
1 gets a 'B'
1 gets a 'D'
2 get an 'F'
There was one repeat entry. As I said - 'Remember all that crap they taught you in school', evidently not.
Comments Glen?
Jim
292 and change sounds about right, but how does that affect the horsepower? OK math gurus. You have gone from 289 cubic inches to 292 by boring 0.030 over. Now, how much horsepower have you added to that engine if any? Show each step of the math.
06-20-2007, 06:10 PM
#29
6th Gear Member
Join Date: Jan 2007
Location: AR
Posts: 5,469
RE: What the cubic inches on a .30 over 289?
ORIGINAL: Soaring
I suck at math. 292 and change sounds about right, but how does that affect the horsepower? OK math gurus. You have gone from 289 cubic inches to 292 by boring 0.030 over. Now, how much horsepower have you added to that engine if any? Show each step of the math.
ORIGINAL: 66GTKFB
The grades are in after my initial post with the formula:
3 get an 'A'
1 gets a 'B'
1 gets a 'D'
2 get an 'F'
There was one repeat entry. As I said - 'Remember all that crap they taught you in school', evidently not.
Comments Glen?
Jim
The grades are in after my initial post with the formula:
3 get an 'A'
1 gets a 'B'
1 gets a 'D'
2 get an 'F'
There was one repeat entry. As I said - 'Remember all that crap they taught you in school', evidently not.
Comments Glen?
Jim
292 and change sounds about right, but how does that affect the horsepower? OK math gurus. You have gone from 289 cubic inches to 292 by boring 0.030 over. Now, how much horsepower have you added to that engine if any? Show each step of the math.
