thats why knowing how to tune an engine is important. Depending on the oil, it can also contribute to combustion power making the chances of lre ignition lower. Other oils, not so much.
Two-Stroke Oils: All the Same?
- Thread starter Paul Bunions
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What's perplexing to me is guys will totally obsess about oil ratio changes affecting air to fuel ratio, yet never touch their carbs when temps change. When I logged I often had to tune the saw in the morning and then again in the afternoon because the temp changed by 40 degrees. You could feel this in the cut.
Which is why Autotune and Mtronic are a good thing..
Yep, sur le makes one wonder.
All this talk about oil and I keep having problems with lousy pump gas.
You've made a claim, now it's your turn to post your evidence. Documented scientific proof. From independent research laboratories. Put the papers on here that back you up. Prove it. Put your money where your keyboard is.
Tomos770
ArboristSite Guru
What was the scale/order/increments of H screw in general? 1/4 +/-? 1/8 +/-?
Piotr Pakuła
ArboristSite Guru
Humidity also affects engine performance
kellenobrien
ArboristSite Lurker
Exactly…like we all can need out but to really be about it takes awareness and constant adjusting, weather conditions parts Condition , systems clean or dirty ya know…I don’t ever see measuring cups and winter fuels and carb tuning screw drivers on anyone’s edc
A carb tuning screwdriver is part of my EDC when cutting - or used to be. My carb'd saw is my backup saw now, so the tuning screwdriver stays on the truck with the backup saw.
500i is NICE.
500i is NICE.
And altitude and barometric pressure...
It's not technically possible...
I can't recall as I never tracked that. It also doesn't matter. You tune the saw until it's right and with time you can feel this in the cut.
This post is worth a read for some of you guys.
Mr. Verret was a petroleum engineer for Conoco IIRC.
https://www.rotaryforum.com/threads/where-has-all-the-penzoil-gone.17287/page-2
Mr. Verret was a petroleum engineer for Conoco IIRC.
https://www.rotaryforum.com/threads/where-has-all-the-penzoil-gone.17287/page-2
Plus they are all different. Some jets have larger holes and coarser threads on the needle, and some have finer threads with a very small orifice
Exactly. It's not like you can make a jet card for use with a radical air density gauge as you would for a snowmobile or mx bike.
Take longer to pull out the card and measure the temp and all that, and look at how many turns that means, than it does to just turn the screw until it sounds right. If you don't know how it's supposed to sound, you won't know when you have to retune anyway.
Yes. The only thing I would say is I go by feel more than sound. Making a saw four stroke out of the cut and then clean up in the cut IME is too rich for peak performance. If you happen to get it to lean this way it's pretty apparent as you can feel the loss of torque.
Here is the RAD gauge I was speaking off to be used with a user generated jet card.
https://www.longacreracing.com/products.aspx?itemid=1763&prodid=7640And another slightly less precise way to calculate jetting.
https://www.longacreracing.com/products.aspx?itemid=1763&prodid=7640And another slightly less precise way to calculate jetting.
Husky77
ArboristSite Operative
I never get that problem
Ol' Brian
ArboristSite Guru
And... still waiting for yours as well. Probably not technically possible as well, I suspect. This is a waste of time, and your ego is bigger than mine. So you can sit there and think you've won. How's that?
Still sticking with Ultra anyway. If it ain't broke don't fix it. The engineers at Stihl are way ahead of you anyway.
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