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Dean_W

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Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline

8th Mar 07 at 14:16

40 profile is 40% of the width, i.e. 195mm or 205mm

Dean_W

Member

Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline

8th Mar 07 at 14:18

quote:
Originally posted by AuroraSport
ok im going to write this down

a 16'' wheel with 195/45 tyre

195/100*45 = 87.75mm = 3.454 inches

so 16 + 3.454 = 19.454 inches * pi (as we all know is 3.14159265)

= 61.1165435 inches i.e. the circumference

In miles?

Scotty C

Member

Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
User status: Offline

8th Mar 07 at 14:18

quote:
Originally posted by AuroraSport
ok im going to write this down

a 16'' wheel with 195/45 tyre

195/100*45 = 87.75mm = 3.454 inches

so 16 + 3.454 = 19.454 inches * pi (as we all know is 3.14159265)

= 61.1165435 inches i.e. the circumference

I feel like im back at school

Much more fun doing it this way though

AuroraSport

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Registered: 5th Mar 05
Location: Norfolk Drives: Audi B5 S4 Avant
User status: Offline

8th Mar 07 at 14:20

61.1165435 inches = 0.000964591911 miles

g-man

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Registered: 26th Feb 06
Location: East Kilbride
User status: Offline

8th Mar 07 at 14:20

quote:
Originally posted by Dean_W
Each cam will turn twice for each RPM of the crank. As the pistons work opposite.

You'll find the cam turns once per two revolutions of the crank on a four stroke engine.

Scotty C

Member

Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
User status: Offline

8th Mar 07 at 14:23

quote:
Originally posted by g-man

quote:
Originally posted by Dean_W
Each cam will turn twice for each RPM of the crank. As the pistons work opposite.

You'll find the cam turns once per two revolutions of the crank on a four stroke engine.

Just once per two turns of the crank? so the valves only open once every two turns of the crank?

g-man

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Registered: 26th Feb 06
Location: East Kilbride
User status: Offline

8th Mar 07 at 14:25

Yup. The engine is on it's compression stroke, so the cam opens the valves as the piston goes down. As the piston returns, the inlet valves shut, combustion takes place and the piston goes down again (this is its second revolution). The exhaust valves start to open then as the piston returns the whole sequence starts again.

AuroraSport

Member

Registered: 5th Mar 05
Location: Norfolk Drives: Audi B5 S4 Avant
User status: Offline

8th Mar 07 at 14:30

ok so what have we all learnt today?

g-man

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Registered: 26th Feb 06
Location: East Kilbride
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8th Mar 07 at 14:31

Engines move fast. That and it's probably not best to touch one doing 3,000 rpm.

Dean_W

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Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline

8th Mar 07 at 14:37

quote:
Originally posted by g-man
Yup. The engine is on it's compression stroke, so the cam opens the valves as the piston goes down. As the piston returns, the inlet valves shut, combustion takes place and the piston goes down again (this is its second revolution). The exhaust valves start to open then as the piston returns the whole sequence starts again.

I thought this, then decided it sounded wrong.

jay kay

Member

Registered: 22nd Jan 06
Location: West Midlands
User status: Offline

8th Mar 07 at 14:39

wow

quite interesting read now when are you going to do some work lol

Dean_W

Member

Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline

8th Mar 07 at 14:39

quote:
Originally posted by AuroraSport
ok so what have we all learnt today?

That your average wheel bearing turns 72,600,000 times in it's life.

Scotty C

Member

Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
User status: Offline

8th Mar 07 at 14:43

quote:
Originally posted by AuroraSport
ok so what have we all learnt today?

Alot. I need a power nap now

Dean_W

Member

Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline

8th Mar 07 at 14:43

Next part is......?

Scotty C

Member

Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
User status: Offline

8th Mar 07 at 14:43

quote:
Originally posted by jay kay
wow

quite interesting read now when are you going to do some work lol

We've been working since the last 4 pages

Scotty C

Member

Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
User status: Offline

8th Mar 07 at 14:44

quote:
Originally posted by Dean_W
Next part is......?

Gearboxes

Dean_W

Member

Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline

8th Mar 07 at 14:45

Ratios?

Scotty C

Member

Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
User status: Offline

8th Mar 07 at 14:46

Erm, haven't got a clue! There is site somewhere to work out gear ratios.

Dean_W

Member

Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline

8th Mar 07 at 14:47

We need domething a bit easier

AuroraSport

Member

Registered: 5th Mar 05
Location: Norfolk Drives: Audi B5 S4 Avant
User status: Offline

8th Mar 07 at 14:48

petrol consumption in your cars' lifetime and £

we can account for price changes and everything

[Edited on 08-03-2007 by AuroraSport]

Dean_W

Member

Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline

8th Mar 07 at 14:51

quote:
Originally posted by AuroraSport
we can account for price changes and everything

I'm all for that, but this bit is a little ambitous......

TimEmo

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Registered: 23rd Jan 07
Location: Wigston, Leicestershire
User status: Offline

8th Mar 07 at 14:52

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

Dean_W

Member

Registered: 13th Dec 05
Location: Downham Market, Norfolk
User status: Offline

8th Mar 07 at 14:53

Scotty C

Member

Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
User status: Offline

8th Mar 07 at 14:55

Can't find anything on gear ratios

Rob H

Member

Registered: 28th Oct 00
Location: Staffordshire Drives: Astra SRi
User status: Offline

8th Mar 07 at 14:56

Gear boxes turn at a different speed to the engine.... well actually the input shaft (from the engine) turns the same speed as the engine, but the output shaft turns at a different rate, depending on the Gear your in.

Basically the gear box is a torque multiplier to transfer the torque from the engin into a usable torque that will turn the wheels.

1st gear is rougly 3:1 ration, so for thee turns of the input shaft, you get one turn of the Out put shaft. Fourth is usally a 1:1 ratio, so for one revolution of the input shaft, you get one revolution of the output shaft. Fifth is usuall an overdrive gear, where by the output shaft turns more than the input shaft, arouns 0.8-0.9:1 ratio.

The output shaft however then goes on to a final drive gear which brings the speed of the engine relative to the wheels even lower. The Differential can also be used to further increase the relative speeds

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