Posts: 2031
Joined: 9/5/2006 From: Barossa Valley, South Australia Status: offline
have you done this or considering it?
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A 2007 study found on average Australians walk 900 miles a year. We drink 26 gallons of beer. That means, on average, Australians get about 34 miles per gallon. Not bad hey!
I just bought a donor car to get the pillars, and it came with a 289 in pretty good shape. I'm thinking about reusing the 289, but it definitely needs a rebuild. I figure it needs a boring, or at least the ridges reemed.
Posts: 2031
Joined: 9/5/2006 From: Barossa Valley, South Australia Status: offline
ok, i dont profess to be expert, but I was told to avoid overboring 289 any more than absolutely necessary as they are fairly thin walled.
the main problem is that they become harder to cool.
you're lucky if you have found a good 289 to start with. they are rarer than rocking horse poo over here
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A 2007 study found on average Australians walk 900 miles a year. We drink 26 gallons of beer. That means, on average, Australians get about 34 miles per gallon. Not bad hey!
I havent heard that Aussie, thanks, I'll keep it in mind. I guess if it can be freshened up and machined to work without overboring it, then theres no need. I was just curious.
Do the math - 4.030 (the bore) divided by 2 - that number times itself - times pi, 3.1416 - times 2.87 (the stroke) - times 8 (it is an 8 cylinder car, right?) and your answer is - Remember all that crap they taught you in school - put it to work.
< Message edited by 66GTKFB -- 6/20/2007 2:01:33 AM >
Do the math - 4.030 (the bore) divided by 2 - that number times itself - times pi, 3.1416 - times 2.87 (the stroke) - times 8 (it is an 8 cylinder car, right?) and your answer is - Remember all that crap they taught you in school - put it to work.
What?
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Posts: 2051
Joined: 11/9/2006 From: South Shores, CA Status: offline
quote:
ORIGINAL: PX429
quote:
ORIGINAL: 66GTKFB
Do the math - 4.030 (the bore) divided by 2 - that number times itself - times pi, 3.1416 - times 2.87 (the stroke) - times 8 (it is an 8 cylinder car, right?) and your answer is - Remember all that crap they taught you in school - put it to work.
What?
The volume of a cylinder times eight.
I'm officially old, I'm worried about our youth.
BTW, if you look at Jim's formula, you'll see that the displacement is directly proportional to the square of the bore. New displacement = ((new bore^2)/(old bore^2))*original displacement. Keep in mind that your number could be off by 1c.i. due to rounding (hint: a 289 is really a 288.52).
Team MF Member #028 Posts: 4243
Joined: 5/11/2005 From: Newark, DE USA Status: offline
quote:
ORIGINAL: fastbackford351
Or you could figure it out this way....
289 x .030 = 8.67
289 + 8.67 = 297.67 cubic inches....
K.I.S.S.
That's wrong dude. The value of 0.030" or 30-over is not a multiple that you apply to the original displacement. It's the add'l diamater added to the cylinder when it is bored out.
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Orig: 66GTKFB Do the math - 4.030 (the bore) divided by 2 - that number times itself - times pi, 3.1416 - times 2.87 (the stroke) - times 8 (it is an 8 cylinder car, right?) and your answer is - Remember all that crap they taught you in school - put it to work.
YES! Engine displacement equals the total volume of each cylinder times the number of cylinders. Using your formula:
4.030 (bore) divided by 2 = 2.015
2.015 x 2.015 = 4.0602
4.0602 X 3.1416 (pi) = 12.7555
12.7555 X 2.87 (stroke) = 36.6082
36.6082 X 8 (# of cyl) = 292.8658 cubic inches
Anybody wanna do the conversion to Liters?
And to the OP, my 289 is 30-over (0.030") with 75K miles on the rebuild (from 1986). No problems with overheating (especially once I put a REAL temp gauge in the car)
[EDIT: I caught my formula error as you were typing your message royal68] [EDIT, part II: I wanted to clarify that my motor was bored 0.030" not 0.300"]
< Message edited by 28HopUp -- 6/20/2007 11:03:20 AM >
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Best 60' .... 1.906 Best 1/8 ... 9.141 @ 76.29 Best 1/4 ... 14.312 @ 95.67
Do the math - 4.030 (the bore) divided by 2 - that number times itself - times pi, 3.1416 - times 2.87 (the stroke) - times 8 (it is an 8 cylinder car, right?) and your answer is - Remember all that crap they taught you in school - put it to work.
Well there's a couple of things going on here. First, it doesn't matter what the displacement is if you bore the engine .3 over because you have ruined the block!! Boring is done in hundredths of an inch so the question should be about boring 0.030". That extra zero between the decimal point and the 3 makes a big difference.
Second, the equation for the area of a circle is pi*radius*radius. Radius = diameter/2. So the correct area would be 4.030/2=2.015. So the area would be 12.756 square inches. The reason 28HopUp is close is because 2..015x2.015=4.060, which is close to the diameter of 4.030". This only gives a close answer if the bore is close to 4". Any other bore and you bet big differences in the answers. The volume of the cylinder would then be 36.61 cubic inches and the engine would be 292.9. Others had the formula right but didn't do the math. One liter equals 61.02374 cubic inches so divide 292.9/61.02374 and you get 4.80 liters. The 302 is 4.95 liters and is usually rounded to 5.0 liters.
The grades are in after my initial post with the formula: 3 get an 'A' 1 gets a 'B' 1 gets a 'D' 2 get an 'F' There was one repeat entry. As I said - 'Remember all that crap they taught you in school', evidently not. Comments Glen? Jim
By making the program, I only had to do the math once,,, but I already knew the formula from high school,,, Basic geometry,,, determining the volume of a cylinder..... X number of cylinders.... (3.14162 x (bore radius x bore radius) x stroke) x number of cylinders,,,,,
< Message edited by JMD -- 6/20/2007 12:57:32 PM >
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The grades are in after my initial post with the formula: 3 get an 'A' 1 gets a 'B' 1 gets a 'D' 2 get an 'F' There was one repeat entry. As I said - 'Remember all that crap they taught you in school', evidently not. Comments Glen? Jim
Printable Version
What's the cubic inches on a .030 over 289? - 
What?
