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n801bh(at)netzero.com
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 Posted: Thu Oct 12, 2006 4:59 pm Post subject: RV6 ram air issues |
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My hangar mate here in Jackson Hole Wy has a RV-6 with a 0-320, Airflow Perf injection and a Vetter crossflow exhaust. In testing the other day his idea was to remove the air filter to try to maximize the ram air effect to the intake. He removed the filter, took off on the carb heat source feeding the injector and at a few hundred feet up switched over the straight ram air. Low and behold the motor just about stopped so he quickly pulled the carb air source again and proceeded to climb up a few more thousand feet to play with it again. He tried all different fuel settings but the motor would never smooth out running just on the ram air alone. He called Vans and they suggested he reinstall the filter and just leave it that way. He then called Airflow Perf and the guy there stated he has heard of several guys that removed the filter without any hiccups. Our consensus is that the incoming air is so turbulant that it is not feeding the throat of the injector body properly. We are really looking for some feedback on others who have tried this similar trick.. The details are,,,, he is at 6600 MSL, the temp was 56f and he did most of the testing at 10,000 msl. Ok guys, anyone want to jump right up and give us some input,, please. Thanks in advance...
do not archive
Ben Haas
N801BH
www.haaspowerair.com
</========================= - Thbsp;Matronics List Features Navigator to browse & Download, 7-Day Browse, Chat, FAQ,< --> http://www.matronics.com/Navigator?RV-List========================sp; - NEat content now also available via the ======================== bsp;some info to the Matronics Email List&========================sp; - List&nbsnbsp; & --> http://www.matronics.com/contribution
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lors01(at)msn.com
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| Posted: Thu Oct 12, 2006 6:09 pm Post subject: RV6 ram air issues |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> The turbulent air theory could be it. I tried an air scoop mounted on the carb of an open air engine (little duce coupe) and it ran rough as hell (and this was at car speeds). Turned the scoop backwards and it ran great.
Ram air does have some merit though. I have it on my Mazda rotary (EFI) powered RV-4 and at 224 mph IAS I see about 32" MAP at sea level. You can actually watch the MP rise as the airspeed climbs. Turbulence does not affect EFI the way it does a carb. I don't really know how the Airflow Performance system works but it looks more related to a pressure carb than it does fuel injection.
Tracy Crook
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dasduck(at)comcast.net
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| Posted: Tue Oct 17, 2006 7:03 pm Post subject: RV6 ram air issues |
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Ben,
I have AFP in a setup with a 180 degree bend from a rear sump which puts the metering unit right under the sump facing forward. I have tried some straight ram air solutions, with mostly poor results.
This is in an RV-6 with O-360. I’m currently using an enclosure that connects directly to the std fwd air scoop and has a K&N cone filter pointing forward inside of it, attached to an extension on the front of the unit.
It’s working pretty well.
I may be able to scare-up some photos of the installations if you want them.
Also, I found that the unit ran far too rich with the ram air issues, requiring leaning at high power settings.
Dw
RV-6 950hrs
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of n801bh(at)netzero.com
Sent: Thursday, October 12, 2006 5:58 PM
To: rv-list(at)matronics.com
Subject: RV6 ram air issues
My hangar mate here in Jackson Hole Wy has a RV-6 with a 0-320, Airflow Perf injection and a Vetter crossflow exhaust. In testing the other day his idea was to remove the air filter to try to maximize the ram air effect to the intake. He removed the filter, took off on the carb heat source feeding the injector and at a few hundred feet up switched over the straight ram air. Low and behold the motor just about stopped so he quickly pulled the carb air source again and proceeded to climb up a few more thousand feet to play with it again. He tried all different fuel settings but the motor would never smooth out running just on the ram air alone. He called Vans and they suggested he reinstall the filter and just leave it that way. He then called Airflow Perf and the guy there stated he has heard of several guys that removed the filter without any hiccups. Our consensus is that the incoming air is so turbulant that it is not feeding the throat of the injector body properly. We are really looking for some feedback on others who have tried this similar trick.. The details are,,,, he is at 6600 MSL, the temp was 56f and he did most of the testing at 10,000 msl. Ok guys, anyone want to jump right up and give us some input,, please. Thanks in advance...
do not archive
Ben Haas
N801BH
www.haaspowerair.com
</========================= - Thbsp;Matronics List Features Navigator to browse & Download, 7-Day Browse, Chat, FAQ,>< --> http://www.matronics.com/Navigator?RV-List========================sp; - NEat content now also available via the ======================== bsp;some info to the Matronics Email List&========================sp; - List&nbsnbsp; & --> http://www.matronics.com/contribution
=========== | Quote: | | http://www.matronics.com/Navigator?RV-List |
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-- Date: 10/12/2006
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10/12/2006
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