How many cubic inches is a 354 Hemi bored .04 over?

Tried a search and didn't see an answer on how to calculate the new cu.in. for a motor.

My engine has already been bored...not looking to add more. Just wondering how many cubes it is now.

 

Without knowing the exact bore and stroke, 362" should be real close.

 

Pi (3.1416) times radius of bore (half diameter)........ squared........Times stroke......... times 8

 

3.14 x half the bore squared times the stroke times number of cylinders.

 

3.1416 X radius squared X stroke X 8

 

Hey, let me Google that for you!

 

PI times radius of the bore squared times stroke times number of cyls

 

Original bore and stroke: 3.9375 x 3.625 for 353.13 cubic inches. Bored .040 over to 3.9775 will increase the displacement to 360.34 cubic inches.

(I think.)

Source: Chrysler FirePower engine

 

All this talk about Pie has made me hungry!

 

Pie are round, cake are square..

 

Thanks for the replies.


So, do I tell people I have a 360 Hemi? What's proper etiquette?




mmmm.....pie is good.

 

I like pie.

 

you tell them you have a 354 bored .040 over stock
and that you need to go back to school to learn 6th grade math

 

Haha!

 

That's what I would do, and if anybody asks how big that makes it now, one could respond that it works out to 360 cubic inches.

Ouch. Actually, I think that level of math (geometry, really, since we're talking about the volume of a cylinder) might be a few years beyond 6th grade.

 

That's 8th grade geometry ****as!

 

Bingo Paul. Of course some wouldn't know enough about hemi to be puzzled by a 360 Hemi, others would think Dan is daft!

 

Forget pi. It is confusig and silly anyway.
Cubic inches equals bore X bore X .7854 X stroke X number of cylinders (8)
Why? Because a circle is alway 78.4% of a square of the same dimensions . 78.54% is .7854 . Top left hand corner of your caculator. Now, in two minutes, you will have the answer and will never need to ask anyone again.

Don

 

Tell 'em nothing, take 'em nowhere! Keep them guessing 90% of them will call it a 392 anyway. The others already know by looking !!

 

And for more quick and sneaky methods in an 8 cylinder engine with a 4 inch bore the cubic inches is always stroke X 100 +2= cu inches .
This only works with a 4 inch bore.

350 chev 4 inch bore 3.48 stroke
so 3.48 X100 = 348 +2 =350

302 ford 4 inch bore 3 inch stroke
3 X 100 = 300 + 2 = 302

360 Dodge 4 inch bore 3.58 stroke
so 3.58 X 100 = 358 + 2 = 360.
just to show a few. This one is my own method.
Don

 

**** This reminds me I have math finals this week

 

Don's showin' off

 

bore x bore x stroke x .7854 x (number of cylinders)

 

Even easier if it's a Hemi, go to hemi.com & use thier CID calculator! They recently posted a link to a story of a car with a 354 in it, turned out to be a .125 over 331...

 

Hey!! We can't all be good at math! I flunked algebra twice.
That's what calculators are for. Actually,DanBabb and I are smart enough to get someone else to kill their braincells trying to figure it out. Mike

 

I tell my daughter - sophomore at Duke - that I wish I could go back to school. But I have to wait until she's done and then get my 8th grader through college.

I can't afford tuition for both of us.

Plus Mike's right....it was faster (and free) to ask the experts here.

 

.04 is not much of an overbore Probably not even worth mentioning

 

Sorry.
I wasnt good at math either . i was good at engines. I was sent home from Grade ten april fools day 1966 . They wanted to know could I do something more constructive with my time. I did.
Don
Still there is a hardly a month goes by when some shop didnt phone here and want an answer to this question or something similar. The math is simple. If you repeat anything out loud 6 times your brain remembers it. I would just like you all to be able to answer this question anytime you are asked.
There are other ways too. I'll not mention them tonight.

 

Ok it is a new day. One more and it is the one you want.
New bore over old bore times cubic inches of engine gives new cubes.
So 3.9775/3.9375 X 354 cu = _______ cu in.
What you are actually doing is figuring the pecenteage of increase the overbore is. If you used the cubes of one cylinder it would give you just that size but since you use the cubes of the whole engine it gives that back, I was taught this by the late Bob McDonald back in 68 at Loyalist College and it always seemed wierd (too simple)but it works.

Ok I am done. I'll go back in my cage now.
Don

 

'never used that method, I like it.