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  #41  
Old 02-22-2018, 07:59 PM
Tomcat RV4 Tomcat RV4 is offline
 
Join Date: Nov 2007
Location: Jacksonville,Fl. 32246
Posts: 221
Default

Use aftermarket conical filter on inlet ,very little chance of being totally covered, +
they can be cleaned and reused ! Tom
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  #42  
Old 10-04-2018, 06:32 AM
SgtZim SgtZim is offline
 
Join Date: May 2015
Location: Crittenden, ky
Posts: 186
Default Is there an upgrade available?

Now I have to make the call as I'm doing the firewall forward stuff. I was leaning to going ahead and installing the Van's bypass (IO with snorkel), BUT:

A. The door and the seat fit poorly. I can sand the door and get it flatter, but the seat/flange is warped and twisted in the stamping process. I'm not sure I can grind it flat enough to seal well, especially after dimpling the holes on the flange. I worked hard to get a good fit and seal on the filter, don't want to add a permanent leak in the system.

B. Speaking of the flange - The instructions have you machine countersink the snorkel in 5 places to mate with the flange dimples and you pop rivet into those - makes a very marginal attachment as you have machined away most of the fiberglass that the pop rivets are gripping (crushing and pushing away as they set).

C. Still some potential for hardware to go down the pipe.

Question for the experienced mechanics and industry wonks - how much leakage past the filter is ok? The snorkel install says I should drill a drain hole at the low point of the snorkel - also I'm not doing that. I have a sniffle valve on the bottom of the manifold to drain moisture and stuff.

So, I'm back to not installing this system at this time. Has anyone made a better mousetrap?
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  #43  
Old 10-04-2018, 08:04 AM
Dan Langhout's Avatar
Dan Langhout Dan Langhout is offline
 
Join Date: Mar 2008
Location: Huntsville, AL USA
Posts: 456
Default Better Mousetrap

HERE is a link to a thread I posted several years ago. Opens AND closes from the cockpit, nothing to ingest into the engine. 4 years and 365 hours of trouble free operation - well . . . . . I haven't had to ACTUALLY use it thank goodness, but it still functions properly and hasn't failed
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  #44  
Old 10-04-2018, 10:54 AM
SgtZim SgtZim is offline
 
Join Date: May 2015
Location: Crittenden, ky
Posts: 186
Default

Thanks Dan, that looks really nice. I'm filing your link for future reference - one of those nice add-ons I can do once the plane is flying.



Quote:
Originally Posted by Dan Langhout View Post
HERE is a link to a thread I posted several years ago. Opens AND closes from the cockpit, nothing to ingest into the engine. 4 years and 365 hours of trouble free operation - well . . . . . I haven't had to ACTUALLY use it thank goodness, but it still functions properly and hasn't failed
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IO360-M1B Sensenich fixed pitch
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  #45  
Old 10-04-2018, 11:25 AM
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grubbat grubbat is offline
 
Join Date: May 2012
Location: Ga
Posts: 574
Default Alternate air door

I had an alternate air door come off a certified plane and get lodged ahead of fuel servo. It was the spring loaded type connected to a push/pull cable. If i were designing one, I'd probably make it from a push/pull cable that if failed, couldn't be injected into motor. I don't prefer the magnet or spring loaded type.
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  #46  
Old 10-04-2018, 07:49 PM
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rzbill rzbill is offline
 
Join Date: Nov 2005
Location: Asheville, NC
Posts: 2,541
Default

There is an old racing adage about winners and speed hardware - "Its not what you put in, it's HOW you put it in".

I think it could apply to the alternate air/filter bypass hardware.

I have the horizontal injected snorkel rotating round door type.

I used the Vans hardware but I did not follow their directions much.
Happy at 750hrs and no indications of change anytime soon.
And dispite the Vans note that the door cannot be reclosed/reset via the cable. Mine does easily.

Here's the first of 3 pages on the subject.
http://websites.expercraft.com/rzbil...y&log_id=63249

I did not talk about it in the blog but I did spend time massaging the parts to make sure they were both FLAT. Not kinda flat, FLAT.
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Last edited by rzbill : 10-04-2018 at 07:57 PM.
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