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rv7maker(at)hotmail.com
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 Posted: Tue Jan 10, 2006 9:31 am Post subject: Was Constant Speed - I/O 390 engine performance ? |
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It may only be 7 or so cubes per cylinder, but if you look at the total
displacement difference, the 390 is 8.3% bigger. Equate this to power and
your looking at almost 17 horses. In reality, the 390 doesn't make 217
horses, it makes right at 210. Many have been run on a good dyno (BPE in
Tulsa) and they do in fact make rated power, which is more than can be said
for the 200 horse rated 360.
So, do you belive that 17 hp can add 5% or about 10 mph? You better, cause
it does. Just ask the 360 guys that get passed up.
Ross
Former RV-7 390 owner
Future RV-7 390 owner
| Quote: | From: "Condon, Philip M." <pcondon(at)mitre.org>
Reply-To: rv-list(at)matronics.com
To: <rv-list(at)matronics.com>
Subject: RE: Was Constant Speed - I/O 390 engine performance ?
Date: Mon, 9 Jan 2006 11:21:31 -0500
Does the extra 7 CID per cylinder yield 5% improvement in total ??? Or
is it more likely a new engine (proper compression and all that)is
responsible for the performance increase......
Is the I/O 390 an angle valve engine ? Was the 360 a parallel of angle
valve engine ??
.......................................................................
................
Dana,
I put approximately 300 hours on the IO360 before converting to the
IO390.
The IO390 added approximately 5% in all parameters.
Dick Martin
RV8 N233M
the fast one
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khorton01(at)rogers.com
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| Posted: Tue Jan 10, 2006 11:45 am Post subject: Was Constant Speed - I/O 390 engine performance ? |
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On 10-Jan-06, at 12:30 , Ross S wrote:
It may only be 7 or so cubes per cylinder, but if you look at the
total
displacement difference, the 390 is 8.3% bigger. Equate this to
power and
your looking at almost 17 horses. In reality, the 390 doesn't make
217
horses, it makes right at 210. Many have been run on a good dyno
(BPE in
Tulsa) and they do in fact make rated power, which is more than can
be said
for the 200 horse rated 360.
So, do you belive that 17 hp can add 5% or about 10 mph? You
better, cause
it does. Just ask the 360 guys that get passed up.
|
Speed increases with the cube root of power, assuming no changes in
prop efficiency, and no changes in drag. If the speed has gone up
5%, then the power has to increase by about 16%.
If the power went up in the same proportion as the increase in
displacement, the speed should go up about 2.7%.
How many folks have changed from a stock IO-360-A series to a stock
IO-390, and made no changes to prop or anything else at the same
time? Not many I bet. So I'm not convinced we really know how much
the speed increase is. There are enough differences from one RV to
another that we can't really compare one IO-360 powered RV against
another IO-390 powered RV and say that the speed differences are due
to the engine alone.
Kevin Horton
Ottawa, Canada
RV-8 - Finishing Kit
http://www.kilohotel.com/rv8
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gcomfo(at)tc3net.com
Guest
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| Posted: Tue Jan 10, 2006 1:39 pm Post subject: Was Constant Speed - I/O 390 engine performance ? |
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To: rv-list(at)matronics.com
Subject: RE: RE: Was Constant Speed - I/O 390 engine performance ?
It may only be 7 or so cubes per cylinder, but if you look at the total
displacement difference, the 390 is 8.3% bigger. Equate this to power and
your looking at almost 17 horses. In reality, the 390 doesn't make 217
horses, it makes right at 210. Many have been run on a good dyno (BPE in
Tulsa) and they do in fact make rated power, which is more than can be said
for the 200 horse rated 360.
Ross
Former RV-7 390 owner
Future RV-7 390 owner
Ross: What propeller did/will you use?
Gordon Comfort
N363GC
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rv7maker(at)hotmail.com
Guest
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| Posted: Wed Jan 11, 2006 11:38 am Post subject: Was Constant Speed - I/O 390 engine performance ? |
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I had the hartzel C/S that vans sells for the 200 horse engine. I would
gladly use it again or step up to the new blended airfoil one when it is
available. The MT's sure are pretty.
| Quote: | From: "Gordon or Marge Comfort" <gcomfo(at)tc3net.com>
Reply-To: rv-list(at)matronics.com
To: <rv-list(at)matronics.com>
Subject: RE: RE: Was Constant Speed - I/O 390 engine performance ?
Date: Tue, 10 Jan 2006 16:39:10 -0500
<gcomfo(at)tc3net.com>
To: rv-list(at)matronics.com
Subject: RE: RE: Was Constant Speed - I/O 390 engine performance ?
It may only be 7 or so cubes per cylinder, but if you look at the total
displacement difference, the 390 is 8.3% bigger. Equate this to power and
your looking at almost 17 horses. In reality, the 390 doesn't make 217
horses, it makes right at 210. Many have been run on a good dyno (BPE in
Tulsa) and they do in fact make rated power, which is more than can be said
for the 200 horse rated 360.
Ross
Former RV-7 390 owner
Future RV-7 390 owner
Ross: What propeller did/will you use?
Gordon Comfort
N363GC
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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gcomfo(at)tc3net.com
Guest
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| Posted: Wed Jan 11, 2006 1:52 pm Post subject: Was Constant Speed - I/O 390 engine performance ? |
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Subject: RE: RE: Was Constant Speed - I/O 390 engine performance ?
I had the hartzel C/S that vans sells for the 200 horse engine. I would
gladly use it again or step up to the new blended airfoil one when it is
available. The MT's sure are pretty.
| Quote: | Ross
Former RV-7 390 owner
Future RV-7 390 owner
Ross: What propeller did/will you use?
|
Ross: Thanks for the reply. Did you find the RPM restriction bothersome? I
will use a 390 and am looking at props. Considering an Aerocomposites 2
blade unit.
Gordon Comfort
N363GC
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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