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Author Can someone confirm this..
Robin
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Registered: 7th Jan 04
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8th Mar 07 at 15:51   View Garage View User's Profile U2U Member Reply With Quote

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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8th Mar 07 at 23:07   View User's Profile U2U Member Reply With Quote

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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8th Mar 07 at 23:25   View User's Profile U2U Member Reply With Quote

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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8th Mar 07 at 23:28   View User's Profile U2U Member Reply With Quote

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   View User's Profile U2U Member Reply With Quote

Sorry, yes mate
SVM 286
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8th Mar 07 at 23:39   View User's Profile U2U Member Reply With Quote

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


Half engine speed Kurt.
AuroraSport
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8th Mar 07 at 23:40   View User's Profile U2U Member Reply With Quote

is this still going
SVM 286
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8th Mar 07 at 23:41   View User's Profile U2U Member Reply With Quote

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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8th Mar 07 at 23:42   View User's Profile U2U Member Reply With Quote

Yeah, just found it a little while ago.

Brilliant thread.
Scotty C
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8th Mar 07 at 23:44   View User's Profile U2U Member Reply With Quote

I'm so confused in my own thread

Thanks SVM
J B
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8th Mar 07 at 23:44   View User's Profile U2U Member Reply With Quote

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   View User's Profile U2U Member Reply With Quote

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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8th Mar 07 at 23:48   View User's Profile U2U Member Reply With Quote

SVM something i always wanted to ask..as in severn valley motorsport? is that anywhere near shropshire?
J B
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8th Mar 07 at 23:48   View User's Profile U2U Member Reply With Quote

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   View User's Profile U2U Member Reply With Quote

I knew someone was going to say that
J B
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8th Mar 07 at 23:51   View User's Profile U2U Member Reply With Quote

SVM 286
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9th Mar 07 at 00:40   View User's Profile U2U Member Reply With Quote

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   View User's Profile U2U Member Reply With Quote

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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9th Mar 07 at 00:53   View User's Profile U2U Member Reply With Quote

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   View User's Profile U2U Member Reply With Quote

Steve X16XE
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Scotty C
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9th Mar 07 at 00:58   View User's Profile U2U Member Reply With Quote

How does the fuel get into the ''intake port''?
SVM 286
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9th Mar 07 at 01:00   View User's Profile U2U Member Reply With Quote

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   View User's Profile U2U Member Reply With Quote

http://www.bo-hemian.com/2str22.gif
Steve X16XE
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9th Mar 07 at 01:01   View User's Profile U2U Member Reply With Quote

Click that link!!!

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