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Robin

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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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8th Mar 07 at 15:51

Depends on the ignition system TBH.

Distributor will be the same as the RPM, Wasted spark will be double the RPM, IIRC

Scotty C

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Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
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8th Mar 07 at 23:07

My god

A two stroke engine only spraks every 720 degree's of the crank does it not, where the stroke does it every 360 degree's?

SVM 286

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Registered: 13th Feb 05
Location: pain
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8th Mar 07 at 23:25

quote:
Originally posted by Monster
My god Thats crazy!

Why do they need to go up and down that fast?

[Edited on 08-03-2007 by Monster]

To produce enough power strokes to haul a ton or more of car down the road Monster.

Nice idea to bring this topic up as a thread mate.

Too many people take engines, incuding their own, for granted, and most people have no idea whatsoever of the kinds of forces at work in the average I.C. engine.

Scotty C

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Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
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8th Mar 07 at 23:28

Completly agree SVM. Never knew my poor little engine worked so hard

I.C? Internal combustion yes?

SVM 286

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8th Mar 07 at 23:34

Sorry, yes mate

SVM 286

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8th Mar 07 at 23:39

quote:
Originally posted by kurtofcc
so how fast does the cam turn?

Half engine speed Kurt.

AuroraSport

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Registered: 5th Mar 05
Location: Norfolk Drives: Audi B5 S4 Avant
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8th Mar 07 at 23:40

is this still going

SVM 286

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Registered: 13th Feb 05
Location: pain
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8th Mar 07 at 23:41

quote:
Originally posted by Monster
That wouldnt matter as thats how wide the tyre is not how big the profile is, hence not effecting 1 RPM of the wheel Wrong? I'll get my coat

Profile is based on a percentage of the tyre width Monster so width will affect the rolling radius of a tyre.

SVM 286

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Location: pain
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8th Mar 07 at 23:42

Yeah, just found it a little while ago.

Brilliant thread.

Scotty C

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8th Mar 07 at 23:44

I'm so confused in my own thread

Thanks SVM

J B

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Registered: 3rd Jan 07
Location: Hants/Wilts Drives: Audi S3
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8th Mar 07 at 23:44

quote:
Originally posted by Monster
My god

A two stroke engine only spraks every 720 degree's of the crank does it not, where the stroke does it every 360 degree's?

Isn't that the other way around? a two stroke engine sparks every 360 deg's whereas the fourstroke will spark every 720 deg's
ie TDC - Suck, BDC - Squeeze, TDC - Bang, BDC - Blow in simple terms!

Scotty C

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8th Mar 07 at 23:46

I thought a two stroke engine only sparks every 720 degree's of the crank, hence the name 'two stroke' because it only ignities every 2nd stroke. Proberly wrong though

AuroraSport

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Registered: 5th Mar 05
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8th Mar 07 at 23:48

SVM something i always wanted to ask..as in severn valley motorsport? is that anywhere near shropshire?

J B

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Registered: 3rd Jan 07
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8th Mar 07 at 23:48

Well going on that theory wouldn't the 4 stoke spark every 4th stroke??

Scotty C

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8th Mar 07 at 23:49

I knew someone was going to say that

J B

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8th Mar 07 at 23:51

SVM 286

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9th Mar 07 at 00:40

quote:
Originally posted by AuroraSport
SVM something i always wanted to ask..as in severn valley motorsport? is that anywhere near shropshire?

It's in Ironbridge near Telford Mr Sport. That may well be in or near Shropshire, my geography is beyond appaling.

SVM 286

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9th Mar 07 at 00:50

quote:
Originally posted by Monster
I thought a two stroke engine only sparks every 720 degree's of the crank, hence the name 'two stroke' because it only ignities every 2nd stroke. Proberly wrong though

No Monster, a four stroke engine utilises what is known as the 'Otto cycle' that is, induction - compression - ignition - exhaust, the four strokes of the combustion process. Each piston travels the swept volume of the bore and back twice, to complete the cycle. Two up, and two down movements, four in total, hence four strokes.

A two stroke engine however completes the process in precisely that, just the two strokes. A lot of 2 stroke units utilise ports rather than valves, this is the case in single cylinder model car engines. They compress and ignite the mixture on one stroke and expel gasses and induce fresh mixture on the other stroke. This is the main reason they are so noisy and smoky, due to the overlap in induction and exhaust and also lubrication being mixed with the fuel.

I've probably just confused you more

Sorry.

Scotty C

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Registered: 6th Nov 05
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9th Mar 07 at 00:53

That makes nothing but sense

wow. Cool

A typical 2 stroke engine doesn't have valves, cams etc does it? Atleast my Moto x bike didn't.

Steve X16XE

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9th Mar 07 at 00:57

Steve X16XE

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9th Mar 07 at 00:57

Scotty C

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Registered: 6th Nov 05
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9th Mar 07 at 00:58

How does the fuel get into the ''intake port''?

SVM 286

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Registered: 13th Feb 05
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9th Mar 07 at 01:00

That's a relief

and yes, as far as I know, that is correct.

They utilise clever porting around the head that is operated by the passage of the piston itself.

Simple, but utter genius when you think about it.

It's because of the simplicity and lack of moving parts that they can rev so high.

I saw 2 stroke drag bikes at Santa Pod a few years ago and Christ! you've never heard anything like it, they sound like they are gonna explode and blow a crater in the earth

Small ones rev super high too due to a lack of inertia because of the minimal mass/weight of what few moving parts there are. One of my model car engines idles at 10,000 RPM, has a working RPM speed of 25,000 and a maximum safe operating speed of 35,000 RPM

Steve X16XE

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9th Mar 07 at 01:01

http://www.bo-hemian.com/2str22.gif

Steve X16XE

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Location: Barnsley, South Yorkshire
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9th Mar 07 at 01:01

Click that link!!!

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