treemonkey stuff

[tree monkey]

exhaust gasket?

i glue the gasket to the shield, so it is in there

 

[Hinerman]

did anyone see what i forgot to do in part 9? lol

Did you take the rope out?

 

[singinwoodwackr]

Did you take the rope out?

Yea, saw that.
Heck, I even rewound the thing trying to catch whatever he did, lol.
I got zip

 

[ZERO]

did anyone see what i forgot to do in part 9? lol

Scott,

You forgot to feed the shop stove, temps dipped below your liking.

Wisconsin fall showed its true colors.

 

[Fabulous]

 

[Fabulous]

The above animation gives a nice view of how the stratos engines operate. Though a Husqvarna is shown I am certain the STIHL version operates similarly

 

[Fabulous]

My question to you Mr. Treemonkey (and hope you ate your wheaties this morning) based on your experience, is this: when we lower the cylinder with a base cut (take “x” amount) viewed from when the piston fires and is on its downward trajectory, aren’t we then changing the timing of the stratos cycle slightly ? In other words the piston cutout is uncovering the port later thus altering the time for the air charge to fill the cylinder and ultimately the fresh charge to come up from the crankcase and “push” the pillow of air out and then fill with mix. I would have to run calculations but it seems it wood change the timing. Most likely won’t make a lick of difference but ….. your thoughts/ experiences on this. I included the animation as trying to explain can get confusing. Thanks in advance for your input !

 

[bwalker]

My question to you Mr. Treemonkey (and hope you ate your wheaties this morning) based on your experience, is this: when we lower the cylinder with a base cut (take “x” amount) viewed from when the piston fires and is on its downward trajectory, aren’t we then changing the timing of the stratos cycle slightly ? In other words the piston cutout is uncovering the port later thus altering the time for the air charge to fill the cylinder and ultimately the fresh charge to come up from the crankcase and “push” the pillow of air out and then fill with mix. I would have to run calculations but it seems it wood change the timing. Most likely won’t make a lick of difference but ….. your thoughts/ experiences on this. I included the animation as trying to explain can get confusing. Thanks in advance for your input !

Of course it changes the timing if the strato cycle. The intake is moved lower and the strato cutouts in the piston stay the same.

 

[Fabulous]

Obviously, …. my question (addressed to Mr Treemonkey btw) was what effect , if any , would this have on the saws performance. Just curious to see what someone who has vast knowledge and experience concerning the subject has to say. If I knew how much was taken off the base or what the new squish measurement was I might be able to calculate to the nearest .0001 of a sec the new values - might not make a lick of difference at 10000 rpm

 

[tree monkey]

My question to you Mr. Treemonkey (and hope you ate your wheaties this morning) based on your experience, is this: when we lower the cylinder with a base cut (take “x” amount) viewed from when the piston fires and is on its downward trajectory, aren’t we then changing the timing of the stratos cycle slightly ? In other words the piston cutout is uncovering the port later thus altering the time for the air charge to fill the cylinder and ultimately the fresh charge to come up from the crankcase and “push” the pillow of air out and then fill with mix. I would have to run calculations but it seems it wood change the timing. Most likely won’t make a lick of difference but ….. your thoughts/ experiences on this. I included the animation as trying to explain can get confusing. Thanks in advance for your input !

yes the stratto port timing changes the same as the intake port timing changes. i consider it all intake as some of the fresh air mixes with the air/fuel charge late in the it the transfer process

 

[tree monkey]

Obviously, …. my question (addressed to Mr Treemonkey btw) was what effect , if any , would this have on the saws performance. Just curious to see what someone who has vast knowledge and experience concerning the subject has to say. If I knew how much was taken off the base or what the new squish measurement was I might be able to calculate to the nearest .0001 of a sec the new values - might not make a lick of difference at 10000 rpm

around 6deg in port open duration

 

[Fabulous]

Thanks for your response - I believe I have an understanding of the concept - look forward to the in-the-cut video

 

[tree monkey]

 

[singinwoodwackr]

What are some of your favorite saws to port?

 

[Fabulous]

That was a nice showing of a built 462c cutting in different wood with short and long bars. Ample torque to pull the chain vs the stock offering tendency to bog/stall chain when pressure is applied to the pistol grip. I’d say most anyone would be happy with the performance of that saw. The fuel mileage/ total wood cut vs time spent is an often overlooked part of the equation and staying in the torque peak (vs high rpm style build cutting) is going to most likely give far better mileage - it’s really physics : cut at 13000 rpm in the wood or 9500-10000 rpm … which saw is going to use more fuel ? … not to mention the wear and tear on the engine. I’ve run some 2/1 saws (2 tanks fuel to 1 tank oil) and while the cut speed is there the mileage was horrible - almost better off with just a muffler mod! Guys will say it’s not possible to increase both performance AND fuel mileage simultaneously however I’m going to disagree. It’s been my experience that it is possible to do so. There was a trend of gutting the stratos awhile back - I actually saw a picture of the work performed and I couldn’t see the hows and whys of that operation. I guess fuel economy is not important to some …

 

[tree monkey]

What are some of your favorite saws to port?

most any pro stihl saw. i do more 661's then anything else

 

[huskihl]

when we lower the cylinder with a base cut (take “x” amount) viewed from when the piston fires and is on its downward trajectory, aren’t we then changing the timing of the stratos cycle slightly ? In other words the piston cutout is uncovering the port later thus altering the time for the air charge to fill the cylinder and ultimately the fresh charge to come up from the crankcase and “push” the pillow of air out and then fill with mix.

Like I mentioned earlier, they open when the piston is on its way up, not down. When there is vacuum in the case. So it happens EARLIER after a base cut. Just like the intake, and at the same time

 

[huskihl]

There’s no vacuum in the case when the piston is on its way down. Nothing to suck air in

 

[tree monkey]

 

[tree monkey]