# [tcb] Re: Engine size

• From: Lisa and the Stevester <stevescott@xxxxxxxxx>
• To: tcb@xxxxxxxxxxxxx
• Date: Thu, 01 Dec 2011 00:40:47 -0600

```You are right...I just always move the decimal over....

Gerald Livingston wrote:

```
```THERE it is!!

I just knew building an engine required fresh PI(E).

But your equation gives him a 1907353.88895744cc engine.

It's actually:

((bore/10) x (bore/10) x (stroke/10) x (3.14159265 / 4) x cylinders))

/10 puts BORE and STROKE in cm, not mm

OR, since we have a 4 cylinder engine we can use:

```
(bore x bore x stroke x 3.14159265)/1000
```rather than dividing the bore and stroke by 10 abd pi by 4 and then
multiplying the result of that by 4 again

so,

8.8 x 8.8 x 7.84 x .785398162 x 4 = 1907.353887743 cc

OR

88 x 88 x 78.4 x 3.14159265 / 1000 = 1907.353888957 cc

for 88mm pistons and a 78.4mm stroke

G2

On Wed, 30 Nov 2011 22:26:41 -0600
Lisa and the Stevester <stevescott@xxxxxxxxx> wrote:

```
```Did anyone answer the question?
It's bore x bore x stroke x 3.14159265

```
On Nov 30, 2011, at 11:07 AM, "Denis Dodson" <coocoo@xxxxxxx> wrote:
```
I cannot remember how to figure engine size. I supposedly have a
1904. When I had it built 9 or 10 years ago I was told it was a
1914. It is  74.8 x 88. If I just multiply that I get 6582.4
which would mean I have a 6 ½ liter engine and I am pretty sure
that is wrong. How do I get to 1914?
```
```

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