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  #1  
Old 09-15-2018, 09:39 PM
pazmanyflyer's Avatar
pazmanyflyer pazmanyflyer is offline
 
Join Date: Jul 2007
Location: Litchfield Park, AZ
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Question RV7 return oil hose routing with SW8432R

Hi all.
I have a new -8 engine to cooler return hose that is 21.5" flare to flare from Tom at TS Flightline. My first attempt was a touch short. You can see here that I am stretching the hose straight and it's not bending at the fitting to my liking. It was way to tight with to much stress at the fitting.



Tom was great in helping me out with another hose (THANK YOU TOM). It fits and it is 1.5" longer than the previous hose with 45's on both ends and now routes behind/under the fuel pressure line.





I have clearance in all areas. 3/4" is the closest and that's between the fuel pressure and oil hoses. I understand I should not clamp this -8 hose to either the motor mount or the fuel pressure line to allow movement with no interference.

So my questions are 1) Can I leave it this as is for hose movement without support? 2) If not, then what is the allowable unsupported hose length and where to clamp it at?

I've looked all over the interwebs and VAF but no clear pictures or discription of this installation has shown themselves to me.
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EAA Chapter 538 President, www.538.eaachapter.org
Wittman Tailwind W8 N53CH (built & sold)
Pazmany PL-1 N2029 (bought & sold)
RV7 - N537TC (reserved & building)
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"The air is an extremely dangerous, jealous and exacting mistress. Once under the spell most lovers are faithful to the end, which is not always old age." - Winston Churchill
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  #2  
Old 09-16-2018, 09:04 AM
TS Flightlines TS Flightlines is offline
 
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Location: Ridgeland, SC
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Hi Carlos, support in the center of the hose is best. Usually 10-12 inches of run. In your case there isnt a place to attach an adel clamp without making an elaborate bracket. The hose, cooler and engine fittings are pretty robust, so you should be fine. Might look at the cross brace on the ending mount between the gear mounts. Might be a good spot for 2 adel clamps.

Tom
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Tom Swearengen, TS Flightlines LLC
Teflon Hose Assemblies for Experimentals
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RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
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www.tsflightlines.com
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  #3  
Old 09-17-2018, 06:25 AM
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Steve Melton Steve Melton is offline
 
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Location: Cincinnati, OH
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CORRECT! "I understand I should NOT clamp this -8 hose to either the motor mount or the fuel pressure line to allow movement with no interference."
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Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 600+ for all

Simplicity is the art in design.

see Amanda Melton for www.rvplasticparts.com

Last edited by Steve Melton : 09-17-2018 at 06:36 AM.
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  #4  
Old 09-17-2018, 08:23 AM
TS Flightlines TS Flightlines is offline
 
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Steve--what I meant was not clamping it directly on the mount, but using 2 adels and possibly a bridge between the 2 as a support hanger. NOT tie wrapping the hose to the mount.

Tom
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Tom Swearengen, TS Flightlines LLC
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com
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  #5  
Old 09-17-2018, 04:36 PM
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Steve Melton Steve Melton is offline
 
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Quote:
Originally Posted by TS Flightlines View Post
Steve--what I meant was not clamping it directly on the mount, but using 2 adels and possibly a bridge between the 2 as a support hanger. NOT tie wrapping the hose to the mount.

Tom
yes, and that would be OK if the hanger support was from the engine. however, I would be inclined to leave it as is and inspect it for any contact after 10 hrs or so. if no contact, then put it on you annual inspection list.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 600+ for all

Simplicity is the art in design.

see Amanda Melton for www.rvplasticparts.com
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  #6  
Old 09-18-2018, 08:04 AM
TS Flightlines TS Flightlines is offline
 
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Thats a good idea too. The length of the hose is 22.5 inches, so even though its long, its a straight routing. Possibly there is somewhere Carlos can affix a bracket.

Tom
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Tom Swearengen, TS Flightlines LLC
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com
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