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  #71  
Old 05-02-2013, 03:53 PM
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hydroguy2 hydroguy2 is offline
 
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just started my oil separator install last night. I was looking at the location for a check valve. I'm planning on a clamping arrangement, so I can avoid welding directly to the exhaust pipe.
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  #72  
Old 05-03-2013, 12:25 PM
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PerfTech PerfTech is offline
 
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Exclamation OUR MISTAKE!!!!!!

Quote:
Originally Posted by schristo@mac.com View Post
As an ongoing follow up on my experiences... The vacuum check valve tube into the exhaust weld totally cracked out. It is now welded back in place with a couple of side braces and a trailing gusset. Hopefully it will eliminate the moment arm vibration and last. Pretty sure that some additional bracing is required and should be addressed during the initial install.
...I am sorry to hear you had a problem with the cracking. I feel like this is my fault as I didn't properly explain the installation of this fitting. When I look at the photos you put up, I see you installed the fitting and tube full length. I left these tubes long to make for more versatility in installs of aircraft other than RVs. The tube only needs be 1&1/2" in length when installed. This reduces the vibration by a very substantial amount and will eliminate the cracking. The valve at that distance will not be affected by heat from the exhaust and will most likely outlast your airplane. I will send you another tube and fitting (no charge) and some stainless gussets if you would like, just let us know. This offer holds true for anyone with this issue, or anyone that wishes to eliminate the potential. Again I apologize for this and would like to make it right. Thanks, Allan...
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  #73  
Old 05-03-2013, 01:53 PM
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I'd love some stainless gussets - I'm maybe a week or two away from installing mine. If you've got some stainless sheet scrap cut up into gussets I'd sure be interested...
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  #74  
Old 05-03-2013, 04:37 PM
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schristo@mac.com schristo@mac.com is offline
 
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Location: WA
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Default shorter pipe and bracing...

Quote:
Originally Posted by PerfTech View Post
...I am sorry to hear you had a problem with the cracking. I feel like this is my fault as I didn't properly explain the installation of this fitting. When I look at the photos you put up, I see you installed the fitting and tube full length. I left these tubes long to make for more versatility in installs of aircraft other than RVs. The tube only needs be 1&1/2" in length when installed. This reduces the vibration by a very substantial amount and will eliminate the cracking. The valve at that distance will not be affected by heat from the exhaust and will most likely outlast your airplane. I will send you another tube and fitting (no charge) and some stainless gussets if you would like, just let us know. This offer holds true for anyone with this issue, or anyone that wishes to eliminate the potential. Again I apologize for this and would like to make it right. Thanks, Allan...
Thanks Allen, a reduced length would help the moment quite a bit and reduce the potential for cracking... still, it might be best to add a gusset and a side brace. This length guidance is good, what are the temperature limits for the check valve? I sure don't want to have a failure from excessive heat.

We made a 'monster garage' fix and welded in side braces and a rear gusset after welding the pipe back in place... not ideal since we did not have any stainless scrap on hand and ended up using some 4130 steel. If it fails it will likely fail the whole exhaust pipe where it has been thoroughly abused I might end up having another end section of exhaust made up and cut the check valve out and start again. I am pretty sure that I can salvage the part though.

I think that a strap based solution, similar to some smoke system injectors, might be preferable...
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  #75  
Old 05-03-2013, 10:07 PM
jchang10 jchang10 is offline
 
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Allan, what do you think of hydroguy's idea of using hose clamps, similar to the way we install EGT temperature probes. It sounds like a good idea, as it would only require a hole and no welding.

If this is an okay idea, would it be possible to offer a tube with a contoured plate on one end, which we could clamp to the exhaust with 2 hose clamps or so.
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  #76  
Old 05-05-2013, 06:15 PM
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Got my oil separator mounted today using the Stephen Christopher "extra hand" method.......still need to install the check valve.


The 90* fitting supplied hits the engine mount, so I used a 45* fitting instead. It's the smaller fitting in this pic with the braided hose on it.
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Last edited by hydroguy2 : 05-05-2013 at 08:56 PM.
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  #77  
Old 05-06-2013, 09:00 AM
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Tim 8-A Tim 8-A is offline
 
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I can't believe the difference! I called Anti Splat Aero, described my set up to them and three days later I have the complete kit. I installed it on Saturday and flew 2.5 hours on Sunday. Went from blowing a quart every 5 hours to zero lost in 2.5. I had everything I needed in the kit including the gussets. I cut the valve down to 1.25" as stated in the directions so I don't expect any problems with the weld cracking.
What a nice kit and great customer service.
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  #78  
Old 05-08-2013, 03:54 PM
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PerfTech PerfTech is offline
 
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Quote:
Originally Posted by schristo@mac.com View Post
Thanks Allen, a reduced length would help the moment quite a bit and reduce the potential for cracking... still, it might be best to add a gusset and a side brace. This length guidance is good, what are the temperature limits for the check valve? I sure don't want to have a failure from excessive heat.

We made a 'monster garage' fix and welded in side braces and a rear gusset after welding the pipe back in place... not ideal since we did not have any stainless scrap on hand and ended up using some 4130 steel. If it fails it will likely fail the whole exhaust pipe where it has been thoroughly abused I might end up having another end section of exhaust made up and cut the check valve out and start again. I am pretty sure that I can salvage the part though.

I think that a strap based solution, similar to some smoke system injectors, might be preferable...
... The temperature the valve can handle is very high and with 1.5" of straight tube it will last forever. They were designed to handle being attached directly to a cast iron exhaust manifold. I think you are correct about the half pipe clamped on type of arrangement being more trouble free and simpler to do for most people. I will try to make some up and put them on our web-site. Then all that would be required is to drill a hole and clamp it on. Thanks, Allan ...
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Allan Nimmo
AntiSplatAero.com
Innovative Aircraft Safety
Products, Tools & Services
Info@AntiSplatAero.com
Southern California (KREI)
RV-9A / Edge-540
(909) 824-1020
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  #79  
Old 05-08-2013, 04:50 PM
TS Flightlines TS Flightlines is offline
 
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Nice looking product Allan---keep it up.
Tom
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  #80  
Old 05-08-2013, 07:08 PM
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hydroguy2 hydroguy2 is offline
 
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Quote:
Originally Posted by PerfTech View Post
... The temperature the valve can handle is very high and with 1.5" of straight tube it will last forever. They were designed to handle being attached directly to a cast iron exhaust manifold. I think you are correct about the half pipe clamped on type of arrangement being more trouble free and simpler to do for most people. I will try to make some up and put them on our web-site. Then all that would be required is to drill a hole and clamp it on. Thanks, Allan ...
Do you have a clamp type ready to ship? I was going to build mine tomorrow after work....but I could hold off if you are ready. My welding skills need tuned up before I get it built I'm sure.
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