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Wheels.8

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Automotive 101

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{Wheels.8.1}: {michael33} Tue, 22 Jan 2002 04:55:41 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:50:44 EDT}

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{Wheels.8.2}: Doug White {dwhite} Tue, 22 Jan 2002 11:20:07 EST (5 lines)

Is this gonna be on the test?

:)

Good job.

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{Wheels.8.3}: Joseph Kang {jsk} Tue, 22 Jan 2002 12:13:19 EST (5 lines)

I hope there isn't a test!

Hey, I have a question and I didn't see an answer to it (or I'm just
*that* clueless and missed it):  why is it called a 4-cycle engine
(i.e., what are the "4 cycles" if there are such things)?

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{Wheels.8.4}: Jil {rabbit} Tue, 22 Jan 2002 15:21:36 EST (15 lines)

Let me see if I remember the sequence:

suck - bang - boom - push!

It's called a four-cycle engine or four-stroke engine because four
separate piston strokes (up and down movement) are required to
complete the cycle. They are:

Intake stroke - the piston slides down, forming a vacuum in the
cylinder. The valve(s) open and air/gasoline are drawn in.
Compression stroke - the piston slides upward, compressing the gas
Power stroke - the spark plug ignites the gasoline, and the resulting
explosion pushes the piston down
Exhaust stroke - the piston comes up again, the valve(s) open, and
the piston pushes the exhaust out

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{Wheels.8.5}: Mike McCarty {beagle} Tue, 22 Jan 2002 15:28:11 EST (2 lines)

I prefer suck-squish-push-whew
(intake, compression, combustion, exhaust).

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{Wheels.8.6}: Joseph Kang {jsk} Tue, 22 Jan 2002 15:33:49 EST (7 lines)

Ah!  That explains it.  OK, follow-up based on discussion about 2-
vs. 4-stroke engines in the snowmobiling topic:

how is this all divided up, if it is, in a two-stroke configuration?
And why are two-strokes louder than 4?

I like this thus far!

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{Wheels.8.7}: Jil {rabbit} Tue, 22 Jan 2002 15:36:34 EST (2 lines)

Someone else will have to tackle that one! I'm no expert on two-
stroke. Not engine-wise, anyway...

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{Wheels.8.8}: {michael33} Tue, 22 Jan 2002 17:15:55 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:50:51 EDT}

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{Wheels.8.9}: Mike McCarty {beagle} Tue, 22 Jan 2002 17:57:35 EST (4 lines)

Not to detract from Michaels' excellent explanation, but I just want
to try to answer the noise question: I suspect it is from the unburned
fuel igniting in the exhaust, I know this is the cause for the noise
in Wankels and nitro burning dragsters.

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{Wheels.8.10}: Jil {rabbit} Tue, 22 Jan 2002 19:06:52 EST (2 lines)

I may be wrong but there may also be the matter of a very short
exhaust system and a smaller muffler.

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{Wheels.8.11}: {michael33} Tue, 22 Jan 2002 20:32:29 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:50:57 EDT}

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{Wheels.8.12}: Joseph Kang {jsk} Wed, 23 Jan 2002 09:08:23 EST (3 lines)

Thanks for the explanations on 2- vs. 4-strokes.  Very enlightening.

And, I love that howstuffworks.com site.

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{Wheels.8.13}: {michael33} Thu, 24 Jan 2002 00:07:03 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:51:01 EDT}

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{Wheels.8.14}: Kathe Nichols {kathe} Thu, 24 Jan 2002 10:33:10 EST (4 lines)

Ah, you got my question about the choke.  You may want to defer
answering this, but:  what in the "evolution" of fuel systems made it
possible for the choke to be automatic instead of manual?  Is there an
advantage to a manual choke?

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{Wheels.8.15}: Doug White {dwhite} Thu, 24 Jan 2002 11:42:45 EST (3 lines)

What is the difference between an engine that has been "jetted" for
higher performance and one that has not?  I assume there must be a
downside, or all engines would be so equipped.  hmmm... Mileage?

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{Wheels.8.16}: {michael33} Thu, 24 Jan 2002 14:15:05 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:51:05 EDT}

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{Wheels.8.17}: {michael33} Fri, 25 Jan 2002 03:34:46 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:51:09 EDT}

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{Wheels.8.18}: Requests {dwhite} Fri, 25 Jan 2002 10:52:26 EST (3 lines)
{hidden}

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{Wheels.8.19}: {michael33} Fri, 25 Jan 2002 16:16:01 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:51:13 EDT}

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{Wheels.8.20}: {michael33} Sat, 26 Jan 2002 04:35:04 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:51:16 EDT}

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{Wheels.8.21}: Michael Boyle {mikel} Mon, 28 Jan 2002 08:10:00 EST (6 lines)

"You can have a little 1.6 litre subcompact that puts out 140Hp, and
still gets 30mpg."

My 2002 Jetta has a 1.8L turbo engine and it's up to 180HP this year.
The 2001 model was rated at 150HP. Don't know about the mileage
figures, but they're supposed to be good to very good.

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{Wheels.8.22}: {michael33} Mon, 28 Jan 2002 14:19:03 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:51:25 EDT}

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{Wheels.8.23}: {michael33} Mon, 04 Feb 2002 03:23:38 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:51:28 EDT}

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{Wheels.8.24}: {michael33} Mon, 04 Feb 2002 03:25:59 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:51:31 EDT}

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{Wheels.8.25}: {michael33} Mon, 04 Feb 2002 03:28:41 EST (0 lines)
{erased by michael33 Mon, 02 Oct 2006 05:51:33 EDT}

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