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Author Can someone confirm this..
Toby
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8th Mar 07 at 15:24   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Dean_W
quote:
Originally posted by AuroraSport
quote:
Originally posted by TimEmo
back to the wheel circumference
u forgot to add the tyre twice cuz its on both sides of the tyre so
u'd get
16 * 25 + 195/100 * 80 = 596 diamter
* pi to get teh cicumference


bollocks you're right

so its 0.0011628589 miles afterall




here it says adding both sides of the tyre and nothing to do with the bit in the middle also i cannot see any referece in the formula to a 45 profile tyre, forgive me if i am wrong
Toby
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8th Mar 07 at 15:26   View Garage View User's Profile U2U Member Reply With Quote
hang on are we talking here how far a wheel would travel at one engine RPM or one wheel revolution??
Robin
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8th Mar 07 at 15:27   View Garage View User's Profile U2U Member Reply With Quote
that's a 40 profile, hence the sum.
Robin
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8th Mar 07 at 15:27   View Garage View User's Profile U2U Member Reply With Quote
one wheel revolution.
Kurt
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8th Mar 07 at 15:29   View User's Profile U2U Member Reply With Quote
lol i did some work for an hour, came back and it had 4 more pages :s
Rob H
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8th Mar 07 at 15:32   View User's Profile U2U Member Reply With Quote
Just to confuse everyone a little more i'm going to include Gear ratio's

My tyres are 205/40/17's,

Hence the circumference is Pi * Diameter

The Diameter is;
17"> mm = 17*25.4 = 431.8mm
+ Sidewall Depth = 205*40%* 2 (Top and bottom side walls) = 164mm
164 + 431.8 = 595.8mm

Hence Circumferance = Pi * 595.8mm = 1871.8mm = 1.87m

Hence, If you travelled 1km, 1000/1.87 = 534 revolutions

Presuming I did the 1km @ a constant 60km/hr(for ease and save me ahving to convert into miles . 60km=37.5mph), that'd mean it will take me 60 seconds to do, hence the wheels are doing 534rpm.

Presuming the final Drive is 3:1, and I was in fourth gear (1:1), the car would be doing a constant 1602rpm, which sounds about right.
Toby
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8th Mar 07 at 15:32   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Robin
one wheel revolution.

ah well i was arguing a point of how far a wheel could travel if a force of one engine RPM was applied to it and thats why i mentioned widths etc and turning force, i will now go hide
Robin
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8th Mar 07 at 15:33   View Garage View User's Profile U2U Member Reply With Quote
16 x 25.4 = 406mm (wheel diameter in mm)
195 divided by 100, times 80 (profile times 2) = 156mm or 175.5 for a 45 profile.

add the 2 together, and you get the overall diameter of the wheel + tyre.

562mm for a 195/40 16
581.8mm for 194/45 16

times that by pi for the circumference IIRC?
Toby
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8th Mar 07 at 15:33   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Rob H
Just to confuse everyone a little more i'm going to include Gear ratio's

My tyres are 205/40/17's,

Hence the circumference is Pi * Diameter

The Diameter is;
17"> mm = 17*25.4 = 431.8mm
+ Sidewall Depth = 205*40%* 2 (Top and bottom side walls) = 164mm
164 + 431.8 = 595.8mm

Hence Circumferance = Pi * 595.8mm = 1871.8mm = 1.87m

Hence, If you travelled 1km, 1000/1.87 = 534 revolutions

Presuming I did the 1km @ a constant 60km/hr(for ease and save me ahving to convert into miles . 60km=37.5mph), that'd mean it will take me 60 seconds to do, hence the wheels are doing 534rpm.

Presuming the final Drive is 3:1, and I was in fourth gear (1:1), the car would be doing a constant 1602rpm, which sounds about right.


excalty the point i was making
still
Robin
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8th Mar 07 at 15:38   View Garage View User's Profile U2U Member Reply With Quote
1765.242mm for the 40 profile
1827.434mm for 45 profile

soooo, a miles is 1,609,344mm

That makes 911.68 revolutions for the 40 and 880.65 for the 45

I think?
Dean_W
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8th Mar 07 at 15:39   View User's Profile U2U Member Reply With Quote
I'm lost
Robin
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8th Mar 07 at 15:40   View Garage View User's Profile U2U Member Reply With Quote
On which bit Dean?
Dean_W
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8th Mar 07 at 15:40   View User's Profile U2U Member Reply With Quote
I'm found.

70,000 Miles x 911 revolutions = 63,770,000

Average lifetime revolutions.

[Edited on 08-03-2007 by Dean_W]
Robin
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8th Mar 07 at 15:41   View Garage View User's Profile U2U Member Reply With Quote
How long does a tyre last on average?

20k? 30?
Rob H
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8th Mar 07 at 15:41   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by CorsaB4ever
excalty the point i was making
still


like i say i'm doing a project on power transmission atm so it literally rolls off the fingers (dodgy grammer an all ).

From those figures though, they're a little out for my car, as it does 40mph in fourth at a little over 2krpm, hence if i re-jigged the calculation above, i can work out that my final drive is 3.745:1, in case anyone wanted to know .
Dean_W
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8th Mar 07 at 15:42   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Robin
How long does a tyre last on average?

20k? 30?


Toyos - 5K
AuroraSport
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8th Mar 07 at 15:42   View User's Profile U2U Member Reply With Quote
i understand




no i do really
Dean_W
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8th Mar 07 at 15:42   View User's Profile U2U Member Reply With Quote
What you thinking Rob, revs per tyre per life?
Robin
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8th Mar 07 at 15:42   View Garage View User's Profile U2U Member Reply With Quote
yeah
Robin
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8th Mar 07 at 15:43   View Garage View User's Profile U2U Member Reply With Quote
I said on average Dean, not on Toyos
Dean_W
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8th Mar 07 at 15:43   View User's Profile U2U Member Reply With Quote
Approximatley 18,220,000 revs for a tyre with 20,000 mile life.
Kurt
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8th Mar 07 at 15:44   View User's Profile U2U Member Reply With Quote
sparks per minute next
Dean_W
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8th Mar 07 at 15:45   View User's Profile U2U Member Reply With Quote
Thats easy. It's the same a piston revolutions is it not?
Rob H
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8th Mar 07 at 15:45   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by kurtofcc
sparks per minute next


Easy peasy. (Rpm * number of cylinders)/2
Rob H
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8th Mar 07 at 15:50   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Dean_W
Thats easy. It's the same a piston revolutions is it not?


Actually, if it were a two stroke engine it would be, but for a 4 stroke, it's half the number

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