2 muffler extensions and longer bolts  
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2 muffler extensions and longer bolts - 5/31/2007 9:37:13 PM   
garywi



Posts: 321
Joined: 9/9/2005
From: Somewhere, AZ, USA
Status: offline 		I am trying to use the Tower .46 muffler with the OS .55.

To clear my fusalage, I need to use 2 extensions and longer bolts.

Has anyone tried this? Will it vibrate apart?

Thanks

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RE: 2 muffler extensions and longer bolts - 6/1/2007 2:16:24 AM   
broke_n_bummin



Posts: 838
Joined: 3/17/2006
From: Kershaw, SC, USA
Status: offline 		Although the muffler may fit physically, looking at the bore and stroke, it would seem logical that you'll be losing quite a few RPMs. The muffler on the Tower .46 is a semi tuned muffler. They both have the same RPM range but the bigger cyllander and longer stroke means that the .55 uses more air. The .46 muffler could cause too much back pressure on the .55 thus reducing RPMs.
As for making up the distance, this is a 35 mm extention, or you could use one of these and make a mousse can muffler. I don't know what you have the engine in, but they also have a 90 degree adapter or even a pitts muffler that would fit the .55

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RE: 2 muffler extensions and longer bolts - 6/1/2007 2:23:49 AM   
Trollmaster



Posts: 375
Joined: 4/16/2007
From: USA, USA
Status: offline
quote:

ORIGINAL: garywi

I am trying to use the Tower .46 muffler with the OS .55.

To clear my fusalage, I need to use 2 extensions and longer bolts.

Has anyone tried this? Will it vibrate apart?

Thanks


WEll if you do, use Permatex "Seal and Bearing Retainer" Can usually find it at NAPA. Holds better under high heat than regular threadlockers


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RE: 2 muffler extensions and longer bolts - 6/1/2007 2:24:48 AM   
garywi



Posts: 321
Joined: 9/9/2005
From: Somewhere, AZ, USA
Status: offline 		All I have to do is tach it on the ground to see if I get more RPM than my current baseline, right?

Thanks

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RE: 2 muffler extensions and longer bolts - 6/2/2007 3:24:01 PM   
DarZeelon



Posts: 7108
Joined: 4/9/2003
From: Rosh-Ha'Ayin, ISRAEL
Status: online
quote:

ORIGINAL: broke_n_bummin

Although the muffler may fit physically, looking at the bore and stroke, it would seem logical that you'll be losing quite a few RPM.



Broke,


???

What gave you that idea?

What do the bore and the stroke have to do with this?


With an extension added, any Helmholz resonator/tuned silencer will be in tune at a lower RPM range, but it will still come into tune and would spin a larger prop, faster than the engine with the same extension and the standard muffler.

quote:



The muffler on the Tower .46 is a semi-tuned muffler. They both have the same RPM range but the bigger cylinder and longer stroke means that the .55 uses more air.
The .46 muffler could cause too much back pressure on the .55 thus reducing RPM.



The larger displacement engine may gain a little less than the smaller one. Increasing the outlet diameter of the Tower muffler by 0.5 mm, will take care of that.

Typically, .61 sized tuned pipes are used on .75-.91 engines, with longer headers, since they are typically timed for lower RPM anyway.
The OS.55AX is built into the same external size as the .46, so it would also do well with the .46 sized exhaust and would thrive on the extended length, to make good use of its lower intended RPM range.

The term 'semi-tuned' is wrong. It is a tuned silencer.


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