Anybody here good at math?

[JIPJOBXX]

I noticed today that all my pistons are stamped .060" and of course that the bore size over. Now can anyone figure out how many cubic inches that would be over the standard 218 Cubic engine. ? No big deal just wondering-Jon:)

[thrashingcows]

Well I love math so I had to figure this out.

Looked on-line and found that the 218 came in two differnt bores and stroke. The 54 218 was different then the 38-53. But that shouldn't matter since the end result is 218 Cu-in.

So I took the bore 3.375 + .060 = 3.435. Then divide by 2 = 1.7175.

Now use Pi x r2 to find the area of the bore. So 1.7175 x 1.7175 x 3.14 = 9.26239.

Now take 9.26239 and multiply that by the stroke 4.063 = 37.63309. Now this is for one cylinder.

So now multiply 37.63309 x 6 gives you a total Cu. in of 225.7985.

[Barabbas]

.060 oversize will give you a 225.8 cubic inch engine

[Barabbas]

oops--didn't see your more complete reply Brian

[james curl]

Does your Dodge have the original 1942 Dodge engine in it. Dodge changed to 230 cu in in 42, I have a 41 dodge engine in my 48 Plymouth and it started out as a 218 cu in engine. My understanding is that the 218 was last used by Dodge in 1941. Maybe some of the experts on the forum can confirm if this is correct.

[Plymouthy Adams]

correct James...my 41 Dodge Town Sedan has a 218 installed in it..as the bores are the same and the stroke the only difference..he can easily go back to Brian's figures and substitute the correct stroke value..he has 4 1/16 value for the 218 stroke and it is actually 4.375 for the 218 and the 230 will be 4.625..

Brian has the correct total CI but mis-typed the stroke value..(unless we are assuming here he is using Canadian figures for the 218 long block)

1954

100 H.P. 6-217.8 1 Bar In Block 3 1/4 x 4 3/8 217.8 7.10 100 @ 3600 177 @ 1600 40-45 4S-140 .035 .020 39 153624 2° +6

110 H.P. 6-230 1 Bar In Block 3 1/4 x 4 5/8 230 7.25 110 @ 3600 190 @ 1600 40-45 4S-140 .035 .020 39 153624 2° +6

Edited February 12, 2010 by Tim Adams

[Reg Evans]

No expert here but that is my understanding too. My 42 Dodge coupe came to me with a D22 engine and is a 230. I replaced that knocking and smoking D22 230 with a much better running D24 230 that was also bored .060 over. I believe it now has 239 cubes. Correct ?

[Plymouthy Adams]

238.8 Reg..but will fudge the .2 due to carbon build up...

[Reg Evans]

Oh yes, It's a good idea to round up unless it's money owed to the IRS.

[greg g]

machinist told me my 230 withthe 40 overs was 235 cu in.

[Johnny 5]

Anybody who wants my displacement calculator can email me an i'll send it to you. It's standard and metric, rod/stroke ratio and cfm/boost/rpm (0 fo rnon-supercharged).

[JIPJOBXX]

Well that math looks good to me but in my machiniest book it states that my engine is a 218 but maybe thats wrong. Well anyway oft to the swap met today and tomorrow my headack will begin again.

[Johnny 5]

Well that math looks good to me but in my machiniest book it states that my engine is a 218 but maybe thats wrong. Well anyway oft to the swap met today and tomorrow my headack will begin again.

It's traditional to round up so a .060" over 218 displaces 226 cubic inches but no sense splitting hairs over less than 1/2 a cubic inch. When you overbore any engine the displacement increases accordingly.

Just for giggles I punched in a .060 over 265 Chrysler. It comes out to 274 CID or 4.5L. Not too bad for six-banger.

[moparjack44]

I should be great in Math, since I spent 4 years in 8th grade Math, but I came up with 231 .

Jack

[Job~Rated]

http://www.sydesjokes.com/members/flash/orgasmic_calculator.swf

[BeBop138]

It's traditional to round up so a .060" over 218 displaces 226 cubic inches but no sense splitting hairs over less than 1/2 a cubic inch. When you overbore any engine the displacement increases accordingly.

Just for giggles I punched in a .060 over 265 Chrysler. It comes out to 274 CID or 4.5L. Not too bad for six-banger.

Not bad---265 is the same cubes as the first SBC in 1955, not a bad year for Chevys..........Lee