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beauford173(at)tampabay.r
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 Posted: Sun Apr 07, 2013 3:10 pm Post subject: Exhaust Clamps - 447 |
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Kolbers:
Today, during annual inspection on the Kleenex Fly, observed that the after market exhaust system clamps on the evil 447
evidenced a problem. These stainless steel circular clamps, held in place with 3/8 inch A/N nuts and bolts around their
circumference, are widely used to replace the traditional Rotax muffler springs. On mine, the innermost clamp closest to the
“Y” in the manifold, no longer had the dimension to clamp securely against the swelling end of the manifold pipe where it
enters into the “U” shaped elbow. This condition was not related to the tightness of the 3/8 inch nuts and bolts… the clamp
had vibrated against the pipe and worn slightly to where it was just slightly too large to grip securely against the manifold tube.
Repositioning the clamp was not an option due to the proximity of the edge of the “U” elbow.
The result was a loose clamp and excessive slop in the manifold-to-elbow connection, together with significant evidence of blow-by leakage at that connection, a
condition which most of you know has larger implications for the reliable operation of a 2-stroke engine.
I think the clamps are tidy, sexy and pretty…and I think the Rotax springs, with their safety wire and red Permatex damping goo, are messy,
primitive and ugly… but the ugly ‘ol springs will be back on Beauford’s toy tomorrow. If you are a “clamper” v.s. a “springer”, you might want to take
a quick peek at yours. Can’t hurt.
Am happy that I was cynical enough not to remove the old Rotax spring hangers when the spiffy new clamps were installed… Never cut off anything
old that might be of some use later…regardless of how improbable that prospect may seem at the time…
…worth what ye paid fer it.
Springy, de-clamped beauford
FF-076, N173BW
Brandon, FL
If you forward this e-mail, please remove my name before sending it... I promise to do the same for you...
Thanks...
[quote][b]
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Sun Apr 07, 2013 8:24 pm Post subject: Re: Exhaust Clamps - 447 |
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These are not stainless, and require a bit of welding and grinding, but they are about as bulletproof as it is possible to make: Go to Advance, Pep Boys, or your favorite purveyor of muffler clamps and get yourself 4 large clamps. Discard the U-bolts. Cut off the ends of the bent U-channel and weld them to the various parts of the exhaust system. Plan ahead, not all positions are equally useful.
Get some 5/16" common bolts at Lowes, drill them for cotter pins at the outer end of the threads. Get four stout springs to fit over the bolts and a handfull of washers, and put the whole mess together. Smear a little anti-seize in the ball joints.
Every 50 hours or so the bolts will get slightly worn away where they pass through the brackets; replace them. Since they are 5/16" bolts, they have to chew away a lot before you need to worry. You can get aircraft quality bolts if you want to, I think 5/16" common bolts are overkill, that's why I use them. Crude? Yeah. Heavy? Yeah. Likely to come apart and go through the prop? Not if you preflight and they are not grooved from wear.
And as my buddy Beauford would say: "Worth what ye paid fer it!"
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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. |
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zeprep251(at)aol.com
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| Posted: Wed Apr 10, 2013 5:18 am Post subject: Exhaust Clamps - 447 |
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The springs that you can get from JBM are stainless steel.You only have to buy them once.You will have them with-in 4 days of ordering.
G.Aman
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beauford173(at)tampabay.r
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| Posted: Wed Apr 10, 2013 6:22 am Post subject: Exhaust Clamps - 447 |
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Thank you for the good tip, Brother Aman…
I have filed the JBM info away and will get back to it after I have worked through my stash of stock
springs…most of them are unused and still smell faintly of Gunskirchen.
I have to go now…. back to my dark corner where I have been alternately sulking, thumbsucking and sobbing
softly to myself after learning what it was going cost to re-pack and re-rocket the ‘ol BRS this time around… If
I weren’t so terrified of heights, I’d be tempted to just take the thing off and recomp the W&B…
Broke again beauford
FF-076
Do not archive
If you forward this e-mail, please remove my name before sending it... I promise to do the same for you...
Thanks...
From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of Gary Aman
Sent: Wednesday, April 10, 2013 9:18 AM
To: kolb-list(at)matronics.com
Subject: Re: Exhaust Clamps - 447
The springs that you can get from JBM are stainless steel.You only have to buy them once.You will have them with-in 4 days of ordering.
G.Aman
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beauford173(at)tampabay.r
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| Posted: Wed Apr 10, 2013 6:47 am Post subject: Exhaust Clamps - 447 |
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Brother Pike:
Now that is super SLICK...! Yours put the commercially marketed clamps on
the night shift...!
You obviously have WAY too much time on your hands during the Tennessee
wintertime. I might be tempted to try
it if I weren't in the habit of cranking out welding that looks like the end
product of a grand-mal seizure.
Thankee fer the inspirational picture... now I'm depressed...
inadequate beauford.... sigh...
Do Not Archive
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zeprep251(at)aol.com
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| Posted: Wed Apr 10, 2013 11:29 am Post subject: Exhaust Clamps - 447 |
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Tell you what Brother Beauford,when people share with me that they are afraid of height,my standard reply is;"That's funny,I'm afraid of width!" That's usually after they have been invited to fly in my Kolb MK3 and shown the good sense to decline.G.Aman
Do not archive
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