- Thread starter Tall T
- Start date
Neil Grant
Member
One would need to know the stock bore to calculate the new cubic inch number.
Tony in SD
Well-known Member
And stock stroke to calculate cubic inch gain. With just stock bore, you can only calculate square inch gain.
The math
Gain= ((3.14 x ((stockbore + 0.040) x (stockbore + 0.040))) x stockstroke) - ((3.14 x (stockbore x stockbore)) x stockstroke)
Example with a stockbore of 3? and stockstroke of 6?
Gain= ((3.14 x ((3 + 0.040) x (3 + 0.040))) x 6) - ((3.14 x (3 x 3)) x 6)
Gain= ((3.14 x (3.040 x 3.040)) x 6) - (3.14 x 9) x 6)
Gain= ((3.14 x 9.2416) x 6) - (3.14 x 9) x 6)
Gain= (29.0186 x 6) - (28.26 x 6)
Gain= 174.112 - 169.56
Gain= 4.552 cubic inches per cylinder
The math
Gain= ((3.14 x ((stockbore + 0.040) x (stockbore + 0.040))) x stockstroke) - ((3.14 x (stockbore x stockbore)) x stockstroke)
Example with a stockbore of 3? and stockstroke of 6?
Gain= ((3.14 x ((3 + 0.040) x (3 + 0.040))) x 6) - ((3.14 x (3 x 3)) x 6)
Gain= ((3.14 x (3.040 x 3.040)) x 6) - (3.14 x 9) x 6)
Gain= ((3.14 x 9.2416) x 6) - (3.14 x 9) x 6)
Gain= (29.0186 x 6) - (28.26 x 6)
Gain= 174.112 - 169.56
Gain= 4.552 cubic inches per cylinder
Tony in SD
Well-known Member
Oops
The example above is incorrect. The bore should be cut in half in all cases.
The example above is incorrect. The bore should be cut in half in all cases.
Hobo,NC
Well-known Member
- Location
- Sanford, NC
A 350 bored .30 over is a 355 always has been always will be I will let someone else do the math...
Sir, with this overbore project, have you the Blueflame
head with valve cover?
Another really nice addition would be the three one barrel
side draft carbs and intake and the split exhaust as used on
the 53 corvette. My friend "D" and I reworked a 52 business
coupe with these Chevrolet options back in the late sixties.
Out ran a lot of small blocks back in the day.
Think I still have an 235 some where in one of the barns.
Good luck with your project. jack
head with valve cover?
Another really nice addition would be the three one barrel
side draft carbs and intake and the split exhaust as used on
the 53 corvette. My friend "D" and I reworked a 52 business
coupe with these Chevrolet options back in the late sixties.
Out ran a lot of small blocks back in the day.
Think I still have an 235 some where in one of the barns.
Good luck with your project. jack
OP
OP
Tall T
Well-known Member
GAjack,
The beast my 235 overbore is in is more akin to my tractor, plain old work truck and low tech motor home. These aluminum bodies were never made in the U.S. so if I sold it, it would be down south.
I first had this 235 rebuild in a 3/4 ton flat deck '53 Chev
and this van is what it has been in since 1980.
I know . . . goofy paint job but kids like it.
Bumper, door handles etc., used to be a darker purple, but my 1/2 gallon of that auto paint froze last winter much to my dismay. So I had this Valspar purple mixed up after looking at a color chip. It'll have to do. The red headlight recesses are Valspar New Holland Red. I really like that red Did my Jube seat frame, seat back and running boards in it too.
TheOldHokie
Well-known Member
- Location
- Myersville, MD
What you want is a high school math student. Per high school geometry the volume of a cylinder is PI x (r<sup>2</sup>) x h
Where:
r = radius of the cylinder
h = height of the cylinder.
PI = 3.1416
For your .040 over-bored engine:
h= 3.9375
r = 3.6025 / 2 = 1.8013
Hence volume of each over-bored cylinder is:
3.1416 x (1.8013<sup>2</sup>) x 3.9375 = 40.137 CI
Total displacement of the engine is 40.137 x 6 = 240.8 CI
You can check my math here: <a href=http://performancetrends.com/Calculators/Engine-Displacement/Engine-Displacement.php>Engine Displacement Calculator</a>
JC had the correct answer right out of the gate but I don't understand his formula. Maybe it was that smart phone thingy...
TOH
Where:
r = radius of the cylinder
h = height of the cylinder.
PI = 3.1416
For your .040 over-bored engine:
h= 3.9375
r = 3.6025 / 2 = 1.8013
Hence volume of each over-bored cylinder is:
3.1416 x (1.8013<sup>2</sup>) x 3.9375 = 40.137 CI
Total displacement of the engine is 40.137 x 6 = 240.8 CI
You can check my math here: <a href=http://performancetrends.com/Calculators/Engine-Displacement/Engine-Displacement.php>Engine Displacement Calculator</a>
JC had the correct answer right out of the gate but I don't understand his formula. Maybe it was that smart phone thingy...
TOH
TheOldHokie
Well-known Member
- Location
- Myersville, MD
By the way the difference equation is also pretty simple although deriving it might challenge a majority of high school geometry students.
You start by computing the difference in area of two circles of radius R<sub>1</sub> and R<sub>2</sub>:
ΔA = πR<sub>2</sub><sup>2</sup> - πR<sub>1</sub><sup>2</sup> = π(R<sub>2</sub><sup>2</sup> - R<sub>1</sub><sup>2</sup>)
I will skip the second extraction of terms for volume since it is the same as the one for area.
Simply multiply that difference in area by the height h to get the difference in volume:
ΔV = πh(R<sub>2</sub><sup>2</sup> - R<sub>1</sub><sup>2</sup>)
Doing the algebra first will save you considerable pen and paper doing the arithmetic.
TOH
You start by computing the difference in area of two circles of radius R<sub>1</sub> and R<sub>2</sub>:
ΔA = πR<sub>2</sub><sup>2</sup> - πR<sub>1</sub><sup>2</sup> = π(R<sub>2</sub><sup>2</sup> - R<sub>1</sub><sup>2</sup>)
I will skip the second extraction of terms for volume since it is the same as the one for area.
Simply multiply that difference in area by the height h to get the difference in volume:
ΔV = πh(R<sub>2</sub><sup>2</sup> - R<sub>1</sub><sup>2</sup>)
Doing the algebra first will save you considerable pen and paper doing the arithmetic.
TOH
(quoted from post at 04:01:41 12/14/18) What you want is a high school math student. Per high school geometry the volume of a cylinder is PI x (r<sup>2</sup>
Where:
r = radius of the cylinder
h = height of the cylinder.
PI = 3.1416
For your .040 over-bored engine:
h= 3.9375
r = 3.6025 / 2 = 1.8013
Hence volume of each over-bored cylinder is:
3.1416 x (1.8013<sup>2</sup>
Total displacement of the engine is 40.137 x 6 = 240.8 CI
You can check my math here: <a href=http://performancetrends.com/Calculators/Engine-Displacement/Engine-Displacement.php>Engine Displacement Calculator</a>
JC had the correct answer right out of the gate but I don't understand his formula. Maybe it was that smart phone thingy...
TOH
Always use V=(pi x r^2) x h
But we have bore, which is D. Yes we could divide by 2, but since D=2r and D^2=4r^2, solving for r^2 per the volume formula yields...
r^2=D^2/4
Pie are round, cornbread are square.
TheOldHokie
Well-known Member
- Location
- Myersville, MD
(quoted from post at 10:28:32 12/14/18)(quoted from post at 04:01:41 12/14/18) What you want is a high school math student. Per high school geometry the volume of a cylinder is PI x (r<sup>2</sup>
Where:
r = radius of the cylinder
h = height of the cylinder.
PI = 3.1416
For your .040 over-bored engine:
h= 3.9375
r = 3.6025 / 2 = 1.8013
Hence volume of each over-bored cylinder is:
3.1416 x (1.8013<sup>2</sup>
Total displacement of the engine is 40.137 x 6 = 240.8 CI
You can check my math here: <a href=http://performancetrends.com/Calculators/Engine-Displacement/Engine-Displacement.php>Engine Displacement Calculator</a>
JC had the correct answer right out of the gate but I don't understand his formula. Maybe it was that smart phone thingy...
TOH
Always use V=(pi x r^2) x h
But we have bore, which is D. Yes we could divide by 2, but since D=2r and D^2=4r^2, solving for r^2 per the volume formula yields...
r^2=D^2/4
Pie are round, cornbread are square.
I assumed as much just didn't take the time to work it backwards.
Love pie - not a fan of cornbread ;-)
TOH
"PI = 3.1416"
"Let's just round that to 3.2" - [b:88bb985653]Indiana state legislature[/b:88bb985653]
"Let's just round that to 3.2" - [b:88bb985653]Indiana state legislature[/b:88bb985653]
TheOldHokie
Well-known Member
- Location
- Myersville, MD
Drs Daniel Shanks and John Wrench - two of the first people I met as a trainee at the Bethesda Naval Research Center, would be appalled. One of their life long achievements was calculating pi to 100,000 decimal places using an IBM 7090 digital computer. A major accomplishment in 1962. Technical report was a mind numbing march of digits across page after page after page...
Daniel Shanks
TOH
TheOldHokie
Well-known Member
- Location
- Myersville, MD
(quoted from post at 14:48:06 12/15/18)
Now that is funny. I had a very dear friend I met on my very first day at the Model Basin. He was fascinated by all things mathematical and when he retired he took to using his mathematical prowess to hook up with young girls in bars. I know what you are thinking - old Jewish geezer trying to pick up pretty young girls with math puzzles. But he was an intelligent and charming man and very successful at it. I have actually met a couple of the girls so I know it wasn't a Photoshop assisted fantasy. That pie would have been the perfect prop for a National PI Day party at his local watering hole. Just in case you don't know Pi Day is celebrated on March 14 so mark your calendar. RIP Stan
TOH
TheOldHokie
Well-known Member
- Location
- Myersville, MD
(quoted from post at 19:39:39 12/15/18)Just in case you don't know Pi Day is celebrated on March 14 so mark your calendar. RIP Stan
TOH
Was the first annual celebration on March 14 , 1592 by chance ?
No but you are thinking along the correct lines ????
The first celebration was 1988 at a San Francisco event organized by physicist Larry Shaw. There was however a celebration of Super Pi Day on March 14, 2015 at precisely 9:26:53.
I think you would have found a kinship with my friend Stan.
TOH
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