SR20 vs SR22 exhaust

[Ben Jackson]

I'm not sure I'd ever seen an SR20 before today, and boy does it have
obnoxious exhausts. Are all Cirrus planes like that and I've just missed
it?

--
Ben Jackson
>
http://www.ben.com/

[xyzzy]

Ben Jackson wrote:
> I'm not sure I'd ever seen an SR20 before today, and boy does it have
> obnoxious exhausts. Are all Cirrus planes like that and I've just missed
> it?
>

According to this admittedly very anti-Cirrus website, an SR22 is seven
times louder than a C-182:

http://www.airplanenoise.com/articles/Skylane%20vs.%20Cirrus.pdf

[Peter R.]

xyzzy ) wrote:

> According to this admittedly very anti-Cirrus website, an SR22 is seven
> times louder than a C-182:
>
> http://www.airplanenoise.com/articles/Skylane%20vs.%20Cirrus.pdf

Link doesn't work.


--
Peter

[Ben Jackson]

In article >, xyzzy > wrote:
>Ben Jackson wrote:
>> I'm not sure I'd ever seen an SR20 before today, and boy does it have
>> obnoxious exhausts. Are all Cirrus planes like that and I've just missed
>> it?
>
>According to this admittedly very anti-Cirrus website, an SR22 is seven
>times louder than a C-182:

I'm not talking about sound, I'm talking about the pipes. They stuck
about 2' out of the bottom of the cowling on the SR20 I saw. Like giant
fangs... I see now that those are only on the SR20 -- the SR22 has much
shorter pipes.

--
Ben Jackson
>
http://www.ben.com/

[TTA Cherokee Driver]

Peter R. wrote:

> xyzzy ) wrote:
>
>
>>According to this admittedly very anti-Cirrus website, an SR22 is seven
>>times louder than a C-182:
>>
>>http://www.airplanenoise.com/articles/Skylane%20vs.%20Cirrus.pdf
>
>
> Link doesn't work.
>
>

Hmm, the server for airplanenoise.com seems to be down.

Type this into google: airplanenoise.com sr-22

then click on "view in html" on the first result returned, to see
Google's cached copy of it. Not all the graphics made it but you can
figure it out. And did I mention this is a very anti-Cirrus article?
However I have no reason to doubt the facts presented (just the way they
are presented is biased, for example the one stat where Cirrus wins
hands down, cruising speed, they poo-poo its importance).

[Jay Honeck]

> I'm not talking about sound, I'm talking about the pipes. They stuck
> about 2' out of the bottom of the cowling on the SR20 I saw. Like giant
> fangs... I see now that those are only on the SR20 -- the SR22 has much
> shorter pipes.

Yep, they're ugly -- but I assume they are "tuned" exhausts...
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

[G.R. Patterson III]

Jay Honeck wrote:
>
> Yep, they're ugly -- but I assume they are "tuned" exhausts...

Well, it may not equate, but the tuning on automotive systems is done in the header.
The length and bends of the pipes from the heads to the collectors is important, but
the length of the exhaust pipes is not.

George Patterson
If you don't tell lies, you never have to remember what you said.

[ISLIP]

> According to this admittedly very anti-Cirrus website, an SR22 is seven
>> times louder than a C-182:
>>

Peter

Interesting PDF but basically bull**** put out by a Cessna sales rep trying to
make some sales.
Being that it contrasts a Turbo Skylane with a Cirrus SR22 & gives 101 reasons
why the Cessna is a better airplane ( & it probably is for some people), the
facts are that 2003 sales are Cessna 182T = 47, while the Cirrus SR22 = 355.
Obviously, a lot of purchasers either didn't read the referenced PDF or else
took it for what it was

John

[Dave Stadt]

"ISLIP" > wrote in message
...
> > According to this admittedly very anti-Cirrus website, an SR22 is seven
> >> times louder than a C-182:
> >>
>
> Peter
>
> Interesting PDF but basically bull**** put out by a Cessna sales rep
trying to
> make some sales.
> Being that it contrasts a Turbo Skylane with a Cirrus SR22 & gives 101
reasons
> why the Cessna is a better airplane ( & it probably is for some people),
the
> facts are that 2003 sales are Cessna 182T = 47, while the Cirrus SR22 =
355.
> Obviously, a lot of purchasers either didn't read the referenced PDF or
else
> took it for what it was
>
> John

The truth will come several years down the road. First year sales are not a
guarantee future years sales will follow suit.

[Jay Honeck]

> > Yep, they're ugly -- but I assume they are "tuned" exhausts...
>
> Well, it may not equate, but the tuning on automotive systems is done in
the header.
> The length and bends of the pipes from the heads to the collectors is
important, but
> the length of the exhaust pipes is not.

Hmmm. I thought that new "performance exhaust" system for Cherokees and
Skyhawks had to be "x" number of inches (feet?) long in order to "tune" the
exhaust, in order to increase horsepower "x" percent?

Isn't that why those things are so big, honkin' ugly, hanging out the bottom
of the plane?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

[Dave Butler]

Jay Honeck wrote:
>>>Yep, they're ugly -- but I assume they are "tuned" exhausts...
>>
>>Well, it may not equate, but the tuning on automotive systems is done in
>
> the header.
>
>>The length and bends of the pipes from the heads to the collectors is
>
> important, but
>
>>the length of the exhaust pipes is not.
>
>
> Hmmm. I thought that new "performance exhaust" system for Cherokees and
> Skyhawks had to be "x" number of inches (feet?) long in order to "tune" the
> exhaust, in order to increase horsepower "x" percent?
>
> Isn't that why those things are so big, honkin' ugly, hanging out the bottom
> of the plane?

Could be a marketing thing. People don't like to spend money on things that
can't be seen.

Dave
Remove SHIRT to reply directly.

[TTA Cherokee Driver]

ISLIP wrote:
>>According to this admittedly very anti-Cirrus website, an SR22 is seven
>>
>>>times louder than a C-182:
>>>
>
>
> Peter
>
> Interesting PDF but basically bull**** put out by a Cessna sales rep trying to
> make some sales.
> Being that it contrasts a Turbo Skylane with a Cirrus SR22 & gives 101 reasons
> why the Cessna is a better airplane ( & it probably is for some people), the
> facts are that 2003 sales are Cessna 182T = 47, while the Cirrus SR22 = 355.
> Obviously, a lot of purchasers either didn't read the referenced PDF or else
> took it for what it was

I agree that the pdf is very biased toward Cessna. But I think the bias
is in the presentation, not in misrepresentation. For example they give
the correct fact that Cirrus blows away Cessna in cruising speed, then
try to say that's not important. But the facts presented are correct.
If you disagree, what specific facts in that PDF are wrong?

Btw, you may not think comparing a turbo skylane with an SR-22 is valid,
but if it's a comparison of $300K vs. $300K it's very valid in my opinion.

[Greg Copeland]

On Wed, 28 Apr 2004 13:49:41 +0000, Jay Honeck wrote:

>> > Yep, they're ugly -- but I assume they are "tuned" exhausts...
>>
>> Well, it may not equate, but the tuning on automotive systems is done in
> the header.
>> The length and bends of the pipes from the heads to the collectors is
> important, but
>> the length of the exhaust pipes is not.
>
> Hmmm. I thought that new "performance exhaust" system for Cherokees and
> Skyhawks had to be "x" number of inches (feet?) long in order to "tune" the
> exhaust, in order to increase horsepower "x" percent?
>
> Isn't that why those things are so big, honkin' ugly, hanging out the bottom
> of the plane?

Well, I can't speak specifically to planes in this regard, but for
some other engines, that's the difference between turned exhaust and a
tuned pipe. The idea is that the pipe is used to improve scavenging
capabilities of the engine. Tuned pipes can often be used in
conjunction with performance headers (tuned exhaust) to improve
overall performance of the engine. The length and size of the pipe
directly relates to the targeted RPM range at which the improved behavior
is desired.

Headers are normally used to improve the ability of the engine to get
exhaust out of the engine. Likewise, pipes are normally used to effect
the scavenging abilities (helping to suck exhaust out of the engine). As
you can see, the two can be considered complimentary.

Granted, I don't normally associate pipes with 4-cycle engines. That
ignored, the length of the pipe, especially with performance headers can
also effect the backpressure on the engine. Too little backpressure can
lead to poor performance, just like too much can. AFAIK, it's not
uncommon to add a longer exhaust pipe to slightly increase backpressure to
compliment a performance header.

[G.R. Patterson III]

Jay Honeck wrote:
>
> Hmmm. I thought that new "performance exhaust" system for Cherokees and
> Skyhawks had to be "x" number of inches (feet?) long in order to "tune" the
> exhaust, in order to increase horsepower "x" percent?

Tuned headers work by the fact that, if you take tubes that are between 32" and 36"
long and hook one end of each to the exhaust port of the engine and the other end to
a collector tube, the flow of the exhaust from the first cylinder to fire will help
pull the exhaust out of the second cylinder to fire. I was told that the length of
the exhaust system after the collector doesn't matter. You can reduce the length of
the tubes in the header by adding bends; conversely, if you have to bend the tubes
for clearance reasons, you have to reduce the length. This is why most automotive
tuned headers look like pretzels.

George Patterson
If you don't tell lies, you never have to remember what you said.

[Aaron Coolidge]

Ben Jackson > wrote:

: I'm not talking about sound, I'm talking about the pipes. They stuck
: about 2' out of the bottom of the cowling on the SR20 I saw. Like giant
: fangs... I see now that those are only on the SR20 -- the SR22 has much
: shorter pipes.

The Mooney Ovation has the same long "tailpipes". I think it is to relocate
the boomy exhaust further from the floor where you put your feet. The Mooney
201 has the exhaust end right under the co-pilot's feet, and the noise and
vibration in tune with the engine is very impressive in the co-pilot's seat.
I find that without noise-cancelling headsets the noise is very tiring after
only an hour or two.
--
Aaron Coolidge (N9376J)