.61 Pitts Muffler on a Tower .75?  
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.61 Pitts Muffler on a Tower .75? - 11/13/2003 6:24:48 PM   
Zzyzxx


 

Posts: 32
Joined: 10/27/2003
From: Alexandria, VA, USA
Status: offline 		Just spoke to support as to why the .61 Pitts Muffler recommended with the Tower .61 wouldn't work on the .75 - restriction was the only answer - Am I just missing something glaring and obvious but couldn't you ream out the exhaust on the muffler to allow for the extra flow?
       Post #: 1

RE: .61 Pitts Muffler on a Tower .75? - 11/13/2003 6:55:42 PM   
w8ye



Posts: 17021
Joined: 12/11/2001
From: Taylortown, OH, USA
Status: offline 		Cavity volume is a bigger issue than back pressure?

I would think though that there wouldn't be enough difference in a 75 to matter too much though?

The Super Tiger 61 and 75 share the same ones though the Super Tiger 90 uses a larger one.

Worse case would be a un explained overheating problem.

Good luck,

Jim

_____________________________

Attended the CutFinger Institute of DirtNap University for years but never did graduate....

Club Saito Member #7
Original AMA #31261

(in reply to Zzyzxx)
       Post #: 2

RE: .61 Pitts Muffler on a Tower .75? - 11/14/2003 1:10:52 AM   
Azcat59


 

Posts: 1004
Joined: 5/30/2002
From: Phoenix, AZ, USA
Status: offline 		You can solve your problem by buying the Slimline Pitts style muffler made for the OS 91FX, and filing the holes in the mounting flange of the muffler just slightly towards the center. It is fairly large capacity, fits the engine well, and the engine runs well with this setup.

Clair

(in reply to w8ye)
       Post #: 3

RE: .61 Pitts Muffler on a Tower .75? - 11/14/2003 4:51:25 AM   
Zzyzxx


 

Posts: 32
Joined: 10/27/2003
From: Alexandria, VA, USA
Status: offline 		Awesome - figured someone had worked this out. Appreciate it much!

(in reply to Azcat59)
       Post #: 4

RE: .61 Pitts Muffler on a Tower .75? - 11/14/2003 6:10:07 AM   
Volfy



Posts: 3227
Joined: 1/4/2002
From: Houston, TX, USA
Status: offline 		91FX muffler mounting holes are 42mm center-to-center. Tower 75 is 40mm, so stretching 1mm each way should do the trick.

However, the Bisson GMS .76 Pitts muffler should fit the Tower perfectly, since they appear to be virtual twins made by the same engine manufacturer. It's priced at $33.99, whereas the Pitts mufflers for a .91FX is either $43 or $50.

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXGBL0&P=0

Not available yet though.

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Si vis pacem, para bellum.

(in reply to Zzyzxx)
       Post #: 5

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