Is there something wrong with my math?

[Thump_rrr]

Is this some of this new math that kids are learning today?
Area of a circle is pi x radius squared
Displacement is area x stroke x number of cylinders
Bore is 3.552 so radius is 1.776
Radius squared is 3.154 x pi = 9.909
9.909 x 3.750 = 37.159 x 8 cyl = 297.274

1L=61.024 cubic inch
297.274/61.024 = 4.871L

What am I doing wrong?
http://www.coasthigh.com/Ford-5-1L-Modular-short-blocks-dish-top-3V-s/12523.htm

 

[Coiled03]

Math is good. Not sure where the missing 0.3L is. I'd guess it's chamber volume, but then, they don't know what heads you're going to run.

 

[WhiteFaleen2001]

I am getting the same answer using the following:

Displacement = pi/4 x bore^2 x stroke x #cyl
D= 3.14159/4 x 12.616704 x 3.750 x 8
D= 3.14159/4 x 378.50112
D=297.27

1L = 61.0237 cubic inch
297.27/61.0237 = 4.87L

 

[dirtyd88]

Math is correct. Maybe there is missing info or wrong info listed?

 

[WhiteFaleen2001]

I also compared to several 4.6s on their website and the math comes out to 281 cc (4.6L)

 

[SonicDTR]

I am getting the same answer using the following:

Displacement = pi/4 x bore^2 x stroke x #cyl
D= 3.14159/4 x 12.616704 x 3.750 x 8
D= 3.14159/4 x 378.50112
D=297.27

1L = 61.0237 cubic inch
297.27/61.0237 = 4.87L

9.3cc per piston, and the "tech specs" tab says 53.9cc heads, adding it to your 4.87L that comes out to 5052.2cc's....some rounding makes it 5.1L (5100cc).

Just my guess.

 

[James Snover]

The stroke for the 4.6 is 3.54, if I remember correctly.

 

[Thump_rrr]

9.3cc per piston, and the "tech specs" tab says 53.9cc heads, adding it to your 4.87L that comes out to 5052.2cc's....some rounding makes it 5.1L (5100cc).

Just my guess.

I used the following calculator using deck height, cylinder head displacement, piston dish and compression ratio and still came up with the same result.
http://www.cbperformance.com/v/enginecalc.html

 

[Thump_rrr]

The stroke for the 4.6 is 3.54, if I remember correctly.

This engine uses a 3.750" stroker crank.

 

[James Snover]

Then your numbers are correct. What answer were you expecting?

This engine uses a 3.750" stroker crank.

 

[Maustang]

Try 3.625, here it says the 3.552 are for the 5.0
http://www.coasthigh.com/Ford-4-6L-Modular-short-blocks-s/125.htm
Also the cc of heads and pistons aren't caculated in to find displacement.

 

[Thump_rrr]

Try 3.625, here it says the 3.552 are for the 5.0
http://www.coasthigh.com/Ford-4-6L-Modular-short-blocks-s/125.htm
Also the cc of heads and pistons aren't caculated in to find displacement.

I already tried it and it is correct with those pistons but those are for the BOSS block which are not the pistons advertised.
They also state that it's a Romeo block which is a 2V iron block.

I'm wasting my time looking at this.
What I really need to find is a Kellogg 3.750 stroker crank to seem my spare engine to JDM to get built right.