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03-14-2011, 04:44 PM
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Join Date: Feb 2006
Location: Austin, TX
Posts: 433
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Making your own exhaust heat shields - howto?
Hi Everybody,
I need a couple of heat shields but at $11+/ea (ACS, Vans) + S&H, I figure I can make my own in a matter of minutes for much less $$$. Looking at the one that came in the FWF kit, it looks to be made of aluminium. Can anybody confirm that and what type of aluminium?
Anybody making their own? Which aluminium are you using (2024, etc) and how far down from the exhaust port are you putting them? I'm looking at 22".
I've plenty of .030 and .063 2024-T3 sheet and a quick check shows that it has a melting point of around 500 ?C (932 ?F); seems a little on the weak side for the given application.
Thanks,
__________________
/\/elson
RV-7A Tip-Up
NW Austin, TX
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03-14-2011, 05:06 PM
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Join Date: Dec 2010
Location: Alpharetta, GA
Posts: 88
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I'm pretty sure that heat shields are typically made out of stainless, not aluminum.
- John
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03-14-2011, 05:28 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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You can certainly make your own....stainless strip standoffs, 2024T3 umbrella.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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03-14-2011, 06:18 PM
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Join Date: Feb 2006
Location: Austin, TX
Posts: 433
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Thanks!
Stainless strip - Check!
Thank you, Dan.
__________________
/\/elson
RV-7A Tip-Up
NW Austin, TX
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03-14-2011, 08:08 PM
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Join Date: Sep 2007
Location: pittsburgh pa
Posts: 533
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I had bad luck with SS strip mounts (I probably used too light a gage). The strip mounts invaribly broke after only a few hours.
As an alternative, I have had excellent results by using two AN3-6 bolts. I ground the head down to a thin "cap". I then drilled a hole in the solid portion of the SS hose clamp and clamped the "shaved head" bolts to the exhaust pipe, somewhat like a welded stud. I then attached the 2024T3 shield by jam nutting it onto the clamped bolt "studs" using steel and steel (no nylon) locking nuts. Has been very secure for 200+ hours. Cheap, easy to make, robust and easy to adjust.
No evidence of heat transfer to nearby fire sleeved lines.
__________________
Gary Reed
RV-6 IO-360
WW 200 RV now an Al Hartzell for improved CG
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03-14-2011, 08:50 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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While you can make your own, it is just easier to add them to a list and include them with your next order.
The time you spend making them will exceed the few dollars Van's and Aircraft Spruce charges for them.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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03-14-2011, 09:29 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Quote:
Originally Posted by David_Nelson
Stainless strip - Check!
Thank you, Dan.
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David,
I've got some stainless in the hangar if you need some.
Darrell
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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03-15-2011, 07:42 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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You can make them entirely of stainless if you want.
If you're having trouble with durability, you probably made the wrong kind....use four standoffs.
Typical for an 1-1/2" pipe:
The very good reason to make your own? Exact size as required.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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03-15-2011, 08:13 AM
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Join Date: Dec 2010
Location: Alpharetta, GA
Posts: 88
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Just to make sure I understand, four standoff and thus two straps?
- John
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03-15-2011, 08:17 AM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Quote:
Originally Posted by John R. Graham
Just to make sure I understand, four standoff and thus two straps?
- John
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That depends on the size of the shield you require, could be two standoffs and one strap (clamps) for a small heat shield. 
__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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