Technical Displacement Chart

really cool! Someone had to type that, on a typewriter...I wonder if there are any errors? No, I'm not going to check.

I recently got a not quite so old Isky slide rule, which will give displacements, as well as several other handy racing numbers. Used to be you had to know how to get information, before we had the google and the app stores.

 

Thanks Boss, That is really cool! Gary

 

Now that would be cool to have in the tool box.

 

it's like a dream wheel with no moving parts,
makes me want to bore and stroke something

 

Fractions.......are for carpenters.

 

Raymond Rupert! I remember him from when I lived in Madisonville, LA, many years ago. He had a really cool 40 pickup. Glad to hear that he's still building cool rides.
Thanks for the chart!

 

I've been going to start a post about doing a conversion chart from inches into thousandths. you always hear Flathead guys talk in terms of inches. (3 3/8th's x 3 3/8th's) but you always hear OHV guys talk in terms of thousandths ( 4.030 X 3.48). It would find a chart for that but this is cool as well.

 

Make that 2, I'm in for 1!

 

Can I be three------ Gary

 

Cool stuff!!! I went straight to double check the 4" bore and 3 1/4" stroke.

 

That's a joke between my brother-in-law and myself. He's a carpenter type and I'm an Aeronautical type and when we are working on a wood type project, it gets comical. Especially, when we are running a tape measure together.

 

NICE!

 

Is he a quarter bubble off like me?

 

So, wondering what are the "Golden Rods" in the list of stuff Jake sells.

 

That's cool! Thanks for putting it out there for us download and print out.

 

I believe he still has the truck

 

Cool! Thanks.

There should be more stuff like this preserved in digital format from days gone by...like what if there was every issue of Rod & Custom at your fingertips (eh...keyboard)- searchable, between features, technical tips, makes of cars etc... That would be awesome...

 

I was told there would be no math today.

 

Here is an easy one for 4" bore eight cylinder engines: take for example an engine with a 3.48" stroke - remove the decimal point and add 2. 348 plus 2 equals 350cubic inches. Try it yourself . Also, a .030" overbore approximately adds 5 cubic inches to your total engine displacement. .060" will increase by 10.
Just some trivia!

 

bore times bore times .7854 times stroke times number of cylinders. Pretty easy to do. I still have my Dream Wheel given to me by Ted Gotelli who had used it for years before me. The gear charts on the other side are more useful.

 

I can close my eyes and see the cardstock wrapping for our Alliance tags printed up just like this; only with T.J.J. in the middle and our Alliance vendors listed on the sides....

 

I'll be first in line if this gets reprinted with T.J.J on it. Poster format would be sweet

 

Just printed it on heavy stock. Thanks!

 

I just made my own version in Excel in 3 minutes, and I haven't checked the entire original chart for type-os but it's accurate at the couple of points I looked at. Mine has more decimal points, because I don't work in fractions.
If you want to make one, it's just (bore area) x (stroke) x 8.
Bore area is (bore squared) x (pi/4), which is just area of a circle.

Bore and stroke 3.0, 3.0625, 3.125, etc., instead of the fractional equiv..

A 10 inch bore and 10 inch stroke is 6283.2 cubes. I think my engineer is showing.

 

And .010" adds 2 cubic inches. An old buddy of mine said he was having a 383 Chevy build for his O/T Trans Am drag car and that he had the block bored .040 I would always correct him and say no you have a 385 Chevy.

 

Saved. Thanks. Gonna come in handy planning my next engine.