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05-04-2018, 08:11 AM
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Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 1,055
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Looked this AM. Sure enough there is interference with the sump. I?ll be adding the spacer. Any feedback on if the snorkel is a problem?
__________________
Ser 104142, RV-14A flying - N1463 
Ser 83825, RV-8 building - N8638? 
USN Ret, Urologist, AME, Repeat Offender
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05-04-2018, 09:31 AM
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Join Date: Aug 2015
Location: Leesburg, VA
Posts: 492
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Here is a pic of the mechanism clearance with the spacer. the arm will hit the sump without the spacer.
Larger 970 washers installed on the rod ends
I also removed the threaded end at the mixture arm from the extension and there are 8 full turns of thread inside the rod but as I mentioned I would prefer the extension rod were slightly longer. I can adjust the control rod at the bracket but it's close to being maxed on length as is.
I have mocked up the snorkel but not done the final cutting and it does fit flush to the FM-150, the length is long enough that the difference in angle up at the air filter is very small and no issue with cowl clearance.
I have no idea why Halie rotated my pics..sorry
Last edited by Nova RV : 05-04-2018 at 09:36 AM.
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05-04-2018, 11:04 AM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,351
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Sorry if this is a hijack of this thread, please delete if you think it is so.
What are the advantage of Airflow performance servo over the skyhwaks that VANs provide.
My engine will be shipped in about a month and if there are enough advantages, I maybe able to change it.
__________________
Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
Dues paid
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05-04-2018, 03:25 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by Bavafa
What are the advantage of Airflow performance servo over the skyhwaks that VANs provide.
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A little less "carb loss", the loss of manifold pressure due to intake restriction.
The bore designs are quite different. See Kitplanes, March 2016.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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05-04-2018, 05:11 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by RV8JD
What is the difference between the Silver Hawk EX-5VA1 offered by Precision Airmotive and the AvStar AVX-5VA1 offered by Lycoming?
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I'm sorry Carl, but I know very little about the AvStar units.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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05-05-2018, 05:33 PM
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Join Date: Jan 2012
Location: Oconomowoc, WI
Posts: 460
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Quote:
Originally Posted by RV8JD
Thanks Dan. There appears to be a dearth of information about the AvStar units. I contacted them for maintenance info and they had none, but said they are in the process of formulating ICAs.
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We support both the stock servo and the Thunderbolt/FM150 combination with our RV14 firewall forward hose kits.
It has been my experience that if you have any questions at all regarding the FM150, Don and the team at Airflow are very knowledgeable about their product line.
FWIW we have seen a large uptick in inquiries regarding the FM150 servo recently as well as a healthy amount of orders over the past two months for firewall forward hose kits with this combination.
Airflow now has the bracketry kits available to make the FM150 fit the RV14/14A.
We have all the dimensions to provide the firewall forward hose kits for the many different combinations that builders are utilizing. (Standard Servo versus FM150, Single PMAG, Dual PMAG, Standard Mags, and Dynon versus Garmin Sensors)
Have a great weekend and happy building,
Steve
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05-06-2018, 03:50 PM
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Join Date: Aug 2015
Location: Leesburg, VA
Posts: 492
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Ok, I found the mounting issue. Do NOT mount the mixture control bracket facing backwards as in the picture in the instructions, mount it facing forward like the throttle cable bracket and that gets you about an extra inch forward. The rod end into the extension tube now has a full 18 turns and the control cable has 15 turns into the back on the extension.

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05-06-2018, 06:49 PM
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Join Date: Dec 2013
Location: Baton Rouge, LA
Posts: 1,055
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Changing out to the longer studs that come with the hardware kit. Got the old stud backed out with the double nut method with a lockwasher between nuts. I have the recommended thread locker Loctite 620.
Long time stud, first time stud changer......
How much loctite is needed?
I found in the service table of limits 25 in-lbs for 5/16 studs but they call it minimum driving torque. Does that mean when I get the stud to 25 in-lbs it’s in correctly or is there another metric to go by?
__________________
Ser 104142, RV-14A flying - N1463 
Ser 83825, RV-8 building - N8638? 
USN Ret, Urologist, AME, Repeat Offender
Last edited by JDA_BTR : 05-06-2018 at 10:11 PM.
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05-07-2018, 08:38 AM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
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Quote:
Originally Posted by JDA_BTR
Changing out to the longer studs that come with the hardware kit. Got the old stud backed out with the double nut method with a lockwasher between nuts. I have the recommended thread locker Loctite 620.
Long time stud, first time stud changer......
How much loctite is needed?
I found in the service table of limits 25 in-lbs for 5/16 studs but they call it minimum driving torque. Does that mean when I get the stud to 25 in-lbs it?s in correctly or is there another metric to go by?
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In general, you only need loctite on 2-3 threads at the tip of the stud/bolt. Screw it in until the middle section (unthreaded) is just snugged against the sump.
__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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11-05-2018, 10:17 AM
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Join Date: Jan 2015
Location: Maryland
Posts: 14
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Mixture control cable-exhaust pipes
Has anyone run into this issue and how did you resolve it? Photos would be great!
After installing the Air Flow 390 bracket kit I noticed that rubber coated mixture control cable is literally laying directly on top of the exhaust pipe a short distance from the bracket plate. The heat from exhaust pipe will quickly cause an issue with the rubber coated control cable. Additionally if the cable is bent upward 90 deg to avoid the hot exhaust pipe in this short space, I anticipate the bend will cause the control cable to bind and hard to operate.
Note the my exhaust pipes are standard from Vans, not the optional Vetterman pipes like I believe Chris Moon has on his RV14A in this thread.
Sorry I was unable to load a photo.
Richard
RV-14A, 390 Thunderbolt
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