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  #21  
Old 05-03-2018, 10:21 PM
JDA_BTR JDA_BTR is offline
 
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Location: Baton Rouge, LA
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I have a Thunderbolt/FM150 combination too. I ordered the mod kit and opened it up today.

I installed mine and did it without the spacer. I was worried that the snorkel would not fit right because the phenolic spacer pushes the FM150 about 3/8 inch more forward. I also didn't want to change the engine bolts out; installing the FM150 with standard washer/stars/nuts has plenty of thread length without the spacer. With the spacer you have to change out to 2" studs.

It didn't seem to affect the controls by being bolted up to the sump without the spacer but I'll take a closer look based on the comment above. Clearances looked fine to my first look.

So if I'm wanting to install the mod kit as AFS intended, with the longer studs and the spacer -> does anyone know what that does to the snorkel fit?
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  #22  
Old 05-04-2018, 09:11 AM
JDA_BTR JDA_BTR is offline
 
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Looked this AM. Sure enough there is interference with the sump. Iíll be adding the spacer. Any feedback on if the snorkel is a problem?
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  #23  
Old 05-04-2018, 10:31 AM
Nova RV Nova RV is offline
 
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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
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Last edited by Nova RV : 05-04-2018 at 10:36 AM.
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  #24  
Old 05-04-2018, 12:04 PM
Bavafa Bavafa is offline
 
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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.
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  #25  
Old 05-04-2018, 04:25 PM
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DanH DanH is offline
 
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Quote:
Originally Posted by Bavafa View Post
What are the advantage of Airflow performance servo over the skyhwaks that VANs provide.
A little less "carb loss", the loss of manifold pressure due to intake restriction.

The bore designs are quite different. See Kitplanes, March 2016.
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  #26  
Old 05-04-2018, 06:11 PM
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Quote:
Originally Posted by RV8JD View Post
What is the difference between the Silver Hawk EX-5VA1 offered by Precision Airmotive and the AvStar AVX-5VA1 offered by Lycoming?
I'm sorry Carl, but I know very little about the AvStar units.
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  #27  
Old 05-05-2018, 06:33 PM
Aircraft Specialty Aircraft Specialty is offline
 
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Quote:
Originally Posted by RV8JD View Post
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.
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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  #28  
Old 05-06-2018, 04:50 PM
Nova RV Nova RV is offline
 
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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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  #29  
Old 05-06-2018, 07:49 PM
JDA_BTR JDA_BTR is offline
 
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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?
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Last edited by JDA_BTR : 05-06-2018 at 11:11 PM.
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  #30  
Old 05-07-2018, 09:38 AM
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Raymo Raymo is offline
 
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Quote:
Originally Posted by JDA_BTR View Post
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 itís in correctly or is there another metric to go by?
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.
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