Help! A non corvette question, but a displacment question

[Nick90vetteguy]

Ok so is a 6.2L the "new" 454? I understand displacment is the way, but would anybody mind trying to explain this? :confused example: the new 2010-2011 camaro's (SS) have the 6.2L engine, another words is this the new 454? thanks guyss

 

[John Robinson]

The formula to convert Liters to cubic inches is.

Liters X 61.023744

Example 5.7L X 61.023744 = 347.835 cubic inches so it get rounded up to 350 cubic inches

6.2L X 61.023744 = 378.66 cubic inches

the formula to convert cubic inches to liters is cubic inches x 0.0163871

Example 454 X 0.0163871 = 7.4 liters

350 X 0.0163871 = 5.7 liters.

So no the 6.2 is not the 454 in fact it is not the 427 either

 

[Nick90vetteguy]

The formula to convert Liters to cubic inches is.

Liters X 61.023744

Example 5.7L X 61.023744 = 347.835 cubic inches so it get rounded up to 350 cubic inches

6.2L X 61.023744 = 378.66 cubic inches

the formula to convert cubic inches to liters is cubic inches x 0.0163871

Example 454 X 0.0163871 = 7.4 liters

350 X 0.0163871 = 5.7 liters.

So no the 6.2 is not the 454 in fact it is not the 427 either

thanks for breaking it down Johnson!

 

[Schrade]

Ford Fairlane in the '60's had a 7.0 litre twister uh huh. I always thought it was just another name for their 460. I never did the math on that one nope...

 

[o2bnkc]

I can remember in first grade (1963) our teacher was saying that the metric system was the wave of the future. OK. When did this country start going to liters instead of cubic inches? I'm not so stupid that I don't realize that it has been around a number of years, but it was kind of sneaky fast, you know? Was it when the Japanese imports started flooding in after 1973? We were used to bragging about our 283,289,327, etc. CUBIC INCHES! I guess it wasn't to impressive to brag about a 43 cubic inch motor or whatever, so it became a 1.2 liter or something like that. WTF? Oh well, I'm done because I have to go see what my AAARP discounts are this month in my latest newsletter.:eyerole

 

[John Robinson]

The next formula is to convert cubic centimeters to liters

CC X 0.001 = Liters

3500 x 0.001 = 3.5 liters

Or how about converting Cubic centimeters to cubic inches

3500 x 0.0610237 = 213 Cubic inches

Or the reverse converting Cubic inches to cubic centimeters

213 x 16.387064 = 3499 cc

Thanks for the question. It made me have to go to the books to find the answer and that has been an eye opener. I never thought about what the CE of my 3500 V6 car was and was surprised to find it was only 213 CE.

 

[Hot Rod Roy]

Okay, how do you explain tire sizes? What's a 315-50-17? Talk about a mixed up language!!! Where did that come from?

 

[John Robinson]

OK here is what the numbers mean on a tire.

Example: 285x40x17

285 is the metric width of the tire from side to side

40 is a percentage of the width of the tire and it is the height of the tire from the ground to the rim. This then is what is called the aspect ratio.

17 is the diameter of the rim.

The formula to calculate tire diameter is.

2 x 285 x 40 divided by 2540 + 17

2 x 285 = 570 x 40 = 22800 div. by 2540 = 8.97 + 17 = 25.97

25.97 is the diameter of of the tire.

So if you change the tire size to say a 315 x 40 x 17 what happens to the speedo etc.

2 x 315 = 630 x 40 = 25200 div by 2540 9.92 = 17 = 26.9

That means you have a larger diameter tire by 1 inche which will in effect give you a speedometer that is slower.

Now you can juggle the aspect ratio to see if you can get a wider tire without increasing the overall diameter of the tire.

With an aspect ratio of 30 the tire diam would be 24.4. With an aspect ratio of 35 it would be 25.68. So now you would know that you need a 315 x 35 x 17 tire to keep the speedo close to correct without having to change it's gears.

The formula for figuring actual MPH is (I will use 65 MPH and I will accept that the speedo is correct with the original tires)

MPH = New tire diam div by Old tire diam x 65

Using the tire diam from above let's see what the indicated speed will be with different tire sizes.

26.9 div. by 25.9 = 1.03 x 65 = 67.5 actual mph
Let's expand this to 75 MPH 77.25

25.68 div by 25.9 = .99 x 65 = 64.44 actual mph

Let's expand this to 75 mph actual speed would be 74.2

Thats enough for this morning class is dismissed.

 

[boomdriver]

Okay, how do you explain tire sizes? What's a 315-50-17? Talk about a mixed up language!!! Where did that come from?

315(mm) width actual contact area varies with style & tread pattern...

50 is profile off the bead, profile description thats found by a formula of sorts..Aspect ratio as John states. This number can alter the way the tire looks and how the wheel relates to the speedo. Sometimes the only difference between 2 different tire sizes is the size of the hole in the center. The outside can be near the same. The outside diameter is what counts when measuring speed.

17"?????? the same ol rim diameter that is part of the formula that produces the middle number (50). So the appropiate amount of sidewall for the height is available. The larger the diameter, the less the sidewall is how its supposed to work...I think:confused

Lets not get into the 17 letters included in the tire size/code....or the new tracking and ID codes. Some include RF tagging. :ugh