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Author Topic: Husqvarna 562xp autotune  (Read 11169 times)

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Offline EHP

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Re: 562 Xp auto tune
« Reply #190 on: April 21, 2015, 09:57:20 pm »
the a/t can give a ton more fuel than what is needed stock, my own 562 is ported pretty hard and a huge ass hole in the muffler and even in -30 degree weather it ran fine , it ran better I felt at that temp . my 562 is alot stronger than a stock 372 but it should be , there is alot of metal missing in those ports
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Offline EHP

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Re: 562 Xp auto tune
« Reply #191 on: April 21, 2015, 09:59:39 pm »
holy **** batman , what in the hell is that for a muffler mod  ;D, should be loud but I'm thinking I would have one hell of a time timing to fall timber with that  ;D
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Offline aclarke

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Re: 562 Xp auto tune
« Reply #192 on: April 21, 2015, 10:01:35 pm »
Sweet spot at about 3.5"  cut it down to 2.95" and went away.

You guys remember the 056 stihl muffler?  Had a tube inside the muffler protruding out the topside. Interesting to know the stihl engineers thinking on that design. Tube was purposely long and buried in the muffler...
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Offline aclarke

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Re: 562 Xp auto tune
« Reply #193 on: April 21, 2015, 10:06:11 pm »
Hahahahahaha.  I was just screwing around to see how the motor reacted!!!  Joe ran some computer simulations on what I might expect at different lengths and rpm. 
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Offline Eccentric

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Re: 562 Xp auto tune
« Reply #194 on: April 21, 2015, 11:06:23 pm »
A Poulan 4200-8500 has a tube that extends into the muffler.  The exit out the side looks like what some guys do with pipe elbows for muffler mods.  I'll have to shoot a few pics.  They sure do sound good, and have lotsa torque.  Not high winders however.....
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Offline aclarke

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Re: 562 Xp auto tune
« Reply #195 on: April 21, 2015, 11:29:11 pm »
Interesting! The 056 had an interesting exhaust note when it was loaded up in a piece of wood. Maybe  tuned for a specific rpm? Don't understand why mfg. Would go to the trouble unless there was a valid reason to go with the long pipe.  Principle has merit IMO, not sure why it's not utilized more?
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Offline 3000 FPS

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Re: 562 Xp auto tune
« Reply #196 on: April 22, 2015, 12:32:19 am »
I think the long pipe extending inside the muffler was for sound and nothing else.
To get any kind of benefit from a piped saw it has to be in line with the harmonics of the exhaust.
3 or 4 inches of pipe will not affect the exhaust in such a way as to benefit from those harmonics, how ever it could affect flow and sound.
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Offline srcarr52

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Re: 562 Xp auto tune
« Reply #197 on: April 22, 2015, 10:21:14 am »
Quote from: 3000 FPS on April 22, 2015, 12:32:19 am
I think the long pipe extending inside the muffler was for sound and nothing else.
To get any kind of benefit from a piped saw it has to be in line with the harmonics of the exhaust.
3 or 4 inches of pipe will not affect the exhaust in such a way as to benefit from those harmonics, how ever it could affect flow and sound.

I agree, it's used to keep as much of the pressure wave of the exhaust port inside the muffler, thus reducing the harsh pop noise.  There is an old dirt bike trick to cut slots in the protruding tube and crush that section of tube in so it snags more of the sound wave and recycles it back into the muffler. It mostly damps the really harsh frequencies.
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Offline Cycledude

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Re: 562 Xp auto tune
« Reply #198 on: April 22, 2015, 10:34:39 am »
I'm guessing the folks that modify thier saw engines are mostly not using that saw to earn a living logging ?  More likely for competition ?
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Offline mdavlee .

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Re: 562 Xp auto tune
« Reply #199 on: April 22, 2015, 12:23:45 pm »
A lot that get paid by bd ft or loads of logs are running modded saws. They make more money with them.
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