Author Topic: Altitude and Tuning a saw  (Read 106 times)

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Offline Cat-Face Timber

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Altitude and Tuning a saw
« on: January 22, 2015, 10:42:55 am »
What effect does Altitude have on a saw?
I am talking about my Husky 288.

I am at elevation 5500 and I usually cut at 6000 to 7000 feet.

Would you re-tune?

Richer or leaner the higher I go?
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Offline aclarke

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Re: Altitude and Tuning a saw
« Reply #1 on: January 22, 2015, 11:28:50 am »
Lean as you go higher. You'll lose power as you go highrr

Offline Cut4fun .

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Re: Altitude and Tuning a saw
« Reply #2 on: January 22, 2015, 12:37:44 pm »
REDNECK Saw Repair Getter Done

Online srcarr52

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Re: Altitude and Tuning a saw
« Reply #3 on: January 22, 2015, 01:09:15 pm »
The higher the altitude the thinner the air is (less ambient air pressure, air is less dense). So if your saw was adjusted for low altitude and you run it at higher altitude without adjusting the carb it would run rich. 

500' isn't going to change much but 1500' would.

No matter what you do as you go higher in altitude you will loose power.

Offline Eccentric

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Re: Altitude and Tuning a saw
« Reply #4 on: January 29, 2015, 02:37:18 pm »
Yep.  It'll run richer (at the same settings) at the higher altitude.  Just be SURE to retune for the lower altitude when you return.  The saw will run leaner at the lower altitude due to the denser air (more oxygen).
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

Online 3000 FPS

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Re: Altitude and Tuning a saw
« Reply #5 on: January 29, 2015, 07:50:15 pm »
There is one other thing that you lose as you go higher and that is compression.   That is one reason why you lose power.
PP 505, 475, 445.

 

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