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jett muffler-120ax - 5/19/2009 2:57 AM   
russm


 

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From: peoria, AZ, USA
Status: online 		i have the 90lx muffler laying around and was wondering how it would ettect the os 120ax on a gp tony?

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RE: jett muffler-120ax - 5/19/2009 7:00 PM   
bob27s



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Status: offline 		mmmm...... should attach bolt-wise ok.  I think the bolt holes are the same as the OS91.   With the OS120 you have to run at least once spacer because of the way the exhaust port aligns.

You will still need the Toni extension kit, or something similar.


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RE: jett muffler-120ax - 5/19/2009 11:52 PM   
russm


 

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Status: online 		it will work w/ the tony ext setup. was wondering about the rpm gain

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RE: jett muffler-120ax - 5/22/2009 2:46 AM   
russm


 

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Status: online 		gained 1000 rpm w/ the jett muffler ( gold ) vs the stock muffler. 15% synth fuel, 14-8 apc prop, 10450 to 11450

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RE: jett muffler-120ax - 5/22/2009 5:28 AM   
CustomPC


 

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The 1.20AX bolt holes are spaced at 48mm compared to 42mm for the ..61 through to .91 sizes.



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RE: jett muffler-120ax - 5/22/2009 6:10 PM   
bob27s



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quote:

ORIGINAL: russm

gained 1000 rpm w/ the jett muffler ( gold ) vs the stock muffler. 15% synth fuel, 14-8 apc prop, 10450 to 11450



Nice......

Probably will unload another 300-400 in flight.  Gets it right to the 12,000 rpm mark where the muffler really begins to help out.  

With that big of a prop, that 1000 rpm represents a bigggggg HP increase.



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RE: jett muffler-120ax - 5/23/2009 3:13 AM   
russm


 

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Status: online 		it felt like it in the air.the fit was good and the jett muffler is lighter as well.it also hugs the fuse a little tighter than the stock muffler. it all adds up to better performance nice setup.

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RE: jett muffler-120ax - 5/24/2009 4:18 AM   
bob27s



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quote:

ORIGINAL: CustomPC

The 1.20AX bolt holes are spaced at 48mm compared to 42mm for the ..61 through to .91 sizes.




Yeah, I think you are right.... but the 48mm matches up with the ST and Jett spacing


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RE: jett muffler-120ax - 5/24/2009 4:19 AM   
bob27s



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Status: offline 		Glad to hear the combination flys well....

ya might want to try something like a 13x10 if you can dig one up


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