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bob88
Joined: 24 Feb 2013
Posts: 99
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 Posted: Mon Jan 05, 2015 8:22 am Post subject: Ram air |
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Anyone with experience using the Rod Bower ram air unit in place of the Vans air box and filter?
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rleffler
Joined: 05 Nov 2006
Posts: 680
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| Posted: Mon Jan 05, 2015 8:53 am Post subject: Ram air |
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Yes. I have one and probably wouldn't install it if I did another build.
It does work as advertised, but there is no data that compares it in a standard configuration. Open it will increase manifold pressure. Closed because its using air from the cowl, it's unclear if running in a reduced power state.
Sent from my iPhone
On Jan 5, 2015, at 11:22 AM, bob88 <marty.crooks(at)comcast.net> wrote:
Anyone with experience using the Rod Bower ram air unit in place of the Vans air box and filter?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=436651#436651
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_________________
Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler |
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bob88
Joined: 24 Feb 2013
Posts: 99
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| Posted: Mon Jan 05, 2015 9:22 am Post subject: Re: Ram air |
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I presume there is no need for alternate air with the Bower unit as it seems to be using alternate air whenever closed in any case. Alternate air in my Cessna causes significant drop in MP relative to regular intake through the air filter.
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rleffler
Joined: 05 Nov 2006
Posts: 680
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| Posted: Mon Jan 05, 2015 9:54 am Post subject: Ram air |
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The drop in MP is what I alluded to in my previous email.
There are folks that believe that the use of the hotter cowl air yields a lower MP than the stand intake with a filter. I typically get 27.7 MP.
Since there has been no test on the same aircraft and engine, there is no data to prove or disprove that theory.
The other non-answered question is with the ram air, how much more MP is there over a standard configuration with filtered air?
It is true you get about an inch of boost between closed an open, buts unclear to me if it really benefits over a standard installation.
I knob that I seem to be a tad slower than Geoff's and about the same as Dana's. What is causing the differences is yet to be determined. Different air filters, fuel injection, electronic ignition, etc could also have an impact.
It's just darn impossible to get the data to do a more scientific comparison.
Sent from my iPhone
On Jan 5, 2015, at 12:22 PM, bob88 <marty.crooks(at)comcast.net> wrote:
I presume there is no need for alternate air with the Bower unit as it seems to be using alternate air whenever closed in any case. Alternate air in my Cessna causes significant drop in MP relative to regular intake through the air filter.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=436654#436654
| | - The Matronics RV10-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:
http://www.matronics.com/Navigator?RV10-List |
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_________________
Bob Leffler
N410BL - Phase I
http://mykitlog.com/rleffler |
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