STC Ram Air

[82Mike]

Anyone know who has the STC for removing the Ram Air on a J model?

 

Thanks!

 

Mike

[aaronk25]

Not sure if there is one? I think they just remove it and note in log book. Could be wrong but it's easy to do.


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[Guest]

Here's the Mooney SI covering it.

http://mooney.com/en/si/M20-93.pdf

[82Mike]

Doc thanks so much that is exactly what I needed!

 

mike

[helitim]

I completed the removal per the SI last year with the engine O/H.  Plan on 3 or 4 hrs, depending on your skill set.  The most difficult part for me was removing the control cable.  

Tim

[ArtVandelay]

I completed the removal per the SI last year with the engine O/H.  Plan on 3 or 4 hrs, depending on your skill set.  The most difficult part for me was removing the control cable.  
Tim

Did you count fixing the hole in the cowling?

[helitim]

No

 

[NotarPilot]

Anyone know how much of a speed benefit this gets or are you removing it just to get rid of something you don't use?

[kortopates]

19 minutes ago, NotarPilot said:

Anyone know how much of a speed benefit this gets or are you removing it just to get rid of something you don't use?

No speed benefit - the rational for removing it is explained in the first line of the SI as minimal, if any, benefit in MAP increase but requires maintenance.

[Piloto]

There is an added safety margin by removing the ram air. If you are flying VFR on top with the ram air open and start your descend into clouds with freezing temperatures and forget to close the ram air there is a chance of engine stall due to freezing the fuel servo impact tubes. I always keep it close in clouds and at low altitude to avoid swarm of bugs ingestion.

José

[MisfitSELF]

My M20J has had it's ram air removed and has a bulbous cap over the intake.  Is there other methods used to cover the intake?

[KSMooniac]

Not sure if you're referring to the aluminum intake box or the cowl... The box should have an aluminum cover riveted on. The cowl should be patched with fiberglass, and body-worked and painted to match.

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[Andy95W]

Who knows, there might be a speed gain from the bulbous cap...

[autopatch]

On 7/8/2017 at 10:05 AM, MisfitSELF said:

My M20J has had it's ram air removed and has a bulbous cap over the intake.  Is there other methods used to cover the intake?

I have heard of folks who have plugged the hole in the cowling with an additional LED taxi light after removing the ram air.

On 2/6/2017 at 3:21 AM, NotarPilot said:

Anyone know how much of a speed benefit this gets or are you removing it just to get rid of something you don't use?

The primary benefit for removal is eliminating maintenance created by something that doesn't improve performance. Doing the Service Bulletin also allowed me to reclaim some panel space by deleting the Ram Air warning light as well as the pull handle.

[Brandontwalker]

I have a 1977 J.  I like the ram air.  It gives you a free boost of around 3/4" of MP.  Every little bit makes a difference.  The maintenance is minimal and generally involves a new seal every 5-7 years (or more).  Jose' is correct though, remember to close it in the clouds and at lower altitudes.  I generally close mine prior to arriving at pattern altitude, or sooner if I see bugs smashing on the wind screen.

Edited July 18, 2017 by Brandontwalker

[KSMooniac]

Ram Air in my '77 barely made the MP needle wiggle, so away it went. No more $300+ seals.

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[ArtVandelay]

Ram Air in my '77 barely made the MP needle wiggle, so away it went. No more $300+ seals.

Ditto for my 78, was only a couple of hours labor.