Engine Crank Stroke???

1. ## Engine Crank Stroke???

I'm trying to determine what stroke crank is in my boat. Does anyone have a way to measure stroke or Cubic inches without removing a head? The engine is installed in the boat but I'm not sure if it is a 509 or a 540.

Thanks.

2.

3. Originally Posted by Mach80
I'm trying to determine what stroke crank is in my boat. Does anyone have a way to measure stroke or Cubic inches without removing a head? The engine is installed in the boat but I'm not sure if it is a 509 or a 540.

Thanks.
use something like a pencil. Take out the plug. Rotate to BDC, locate an index point (top of threads) make a mark. Rotate to TDC make another mark and measure. Stroke x bore x 8=CID

4. Originally Posted by 2002CP19
use something like a pencil. Take out the plug. Rotate to BDC, locate an index point (top of threads) make a mark. Rotate to TDC make another mark and measure. Stroke x bore x 8=CID
....

1/2bore x 1/2 bore x pi x stroke x #cyls

5. Originally Posted by Flat BROKE 612
....

1/2bore x 1/2 bore x pi x stroke x #cyls

bore X bore X .7854 X Stroke X #cylinders

6. Originally Posted by 2002CP19
use something like a pencil. Take out the plug. Rotate to BDC, locate an index point (top of threads) make a mark. Rotate to TDC make another mark and measure. Stroke x bore x 8=CID
So, you have a magic pencil that can make the turn and drop straight down the cylinder for this high tech method?
Why did people spend 1500.00 plus for a CID tester when you can do it with a pencil?

stock 454 bore/stroke
4.00(stroke) X 4.250(bore) X 8= 136

I what you checking my engine size at the races

7. Originally Posted by gn7
So, you have a magic pencil that can make the turn and drop straight down the cylinder for this high tech method?
Bob, Wouldn't the correct tool for a mechanic to use in this procedure be a ....... "mechanical" pencil?

8. Originally Posted by gn7
So, you have a magic pencil that can make the turn and drop straight down the cylinder for this high tech method?
Why did people spend 1500.00 plus for a CID tester when you can do it with a pencil?

stock 454 bore/stroke
4.00(stroke) X 4.250(bore) X 8= 136

I what you checking my engine size at the races
I didnt say it was high tech. Just a thought...

I've been wrong before.

9. Originally Posted by 2002CP19
I didnt say it was high tech. Just a thought...

I've been wrong before.
OH, I thought you had personal experience with that method
Originally Posted by Franger
Bob, Wouldn't the correct tool for a mechanic to use in this procedure be a ....... "mechanical" pencil?
I perfer to use a Camodian Magic Wand myself.

10. Originally Posted by gn7

bore X bore X .7854 X Stroke X #cylinders
Ya but mine has PI!!! MMMMM pie.......

11. Find someone who has a P&G that can pump the motor for cubic inches.........like at a sanctioned race or some who may be involved with such things!!!!!!

12. Originally Posted by gn7
OH, I thought you had personal experience with that method

I perfer to use a Camodian Magic Wand myself.
Well I have used that method before, just not to measure.

Looks like the cambodian unit will do the trick...

13. Originally Posted by Franger
Bob, Wouldn't the correct tool for a mechanic to use in this procedure be a ....... "mechanical" pencil?
only if it's a "union" mechanic.

radius (1/2 bore diameter) squared x 3.1415927 x height(stroke) x 8

or, pi x r2 x stroke x 8

with a p&g meter, if you get really really lucky, somebody might get within 10% of the actual ci with it. POS...

14. Originally Posted by bp298
only if it's a "union" mechanic.

radius (1/2 bore diameter) squared x 3.1415927 x height(stroke) x 8

or, pi x r2 x stroke x 8

with a p&g meter, if you get really really lucky, somebody might get within 10% of the actual ci with it. POS...
You guys sure do like you PI. MMMMMmmmmmmm pie!

15. Originally Posted by gn7
You guys sure do like you PI. MMMMMmmmmmmm pie!

Pie is always Good , Bob ,,, Apple , Berry , Peach , Cherry , HAIR , (lol) ....... MMMMMMMMMMM PIE ...

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