working on other builders saws

[DSS]

I'll ask again, what in the world are you trying to say????

I think his ass is itchin

 

[Czed]

Please elaborate?


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What's he trying to say i thought at 46 i had a good grasp of the lingo and English but i don't understand.

 

[Termitebuffet]

I'm fairly certain he's talking metric.....

 

[Deets066]

Just look at the pic

 

[Ryan Browne]

If you are paying attention here TM just gave away all the secrets to fine port work in this pic. Cell phone to call your friends and get some of those "Magic" mushrooms there. After that it's just the matter of BFH and some skill with experience, you dig?

I knew Scott was a fun-gi the minute I met him.

 

[drf256]

View attachment 65915

this is what it looks like after cutting .015". had to stop ad check to see if I was cutting it square to the bore, I indeed was. this is why I recommend to at least cut enough to correct it.

I can see that the factory squish was off. Are you also saying you were checking if your cut was square to the bore?
If so, why would the mandrel cut unsquare to the bore?


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I've been there many times and it's very odd. Always figured it was me but I confirmed it was the factory with a depth micrometer.

The factory bands can be off way more than any of us would imagine possible.

Dan, you can still be square but if you're not using a stop on your mandrel like Scott is, you can still have varying height as you cut. Non-symmetric bands, like an 026 with an offset chamber, are the toughest. The thinner part of the band needs less pressure to cut the same amount. Very easy to gouge it there.

My stop is not as nice as Scott's. I use a spilt piece of PVC pipe and a hose clamp, when I actually use one.

 

[drf256]

View attachment 65917

build sheet. numbers on the left are where the ports landed after base and squish cut. numbers on the right are my target numbers.

I woulda thought you'd go with less exhaust duration. Are you finding smaller saws don't need the lower roof like previously thought?

 

[tree monkey]

some saws run better for me with a little higher exhaust. this is one.

 

[tree monkey]

the exhaust port is off center to the bore. I cut the left side as far as I can to get it more centered. I think it helps scavenging.

 

[jake wells]

saw either run for me or they don't.

 

[tree monkey]

I raise the roof to give more room to work, and more volume.

 

[jimmorrison]

View attachment 66373

the exhaust port is off center to the bore. I cut the left side as far as I can to get it more centered. I think it helps scavenging.

If air flow,is air flow, it will be an improvement.

 

[tree monkey]

I put a wood mandrel in the cylinder and trace the port window.



the port is tipped, not square to the bore.



I cut a notch just shy of the target duration. give me a reference to work from.

 

[paragonbuilder]

View attachment 66373

the exhaust port is off center to the bore. I cut the left side as far as I can to get it more centered. I think it helps scavenging.

Any ideas why the factory engineers made it off center?


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[tree monkey]

I put the mandrel in the lath to add the lines square to the bore. port is still tipped.



that's better.

 

[Dub11]

Ive seen a small Echo with a intake that was like that. And that notch is brilliant!

 

[tree monkey]

Any ideas why the factory engineers made it off center?


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puts it in the center of the muffler. don't know why that would matter

 

[awol]

Any ideas why the factory engineers made it off center?


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It's only off-center at the outlet, not the inlet. I think it is like this to help the muffler can clear the bar and chain, maybe for improved scavenging.

 

[tree monkey]

that's all I got for now. been working on redbulls 661's. i'll get back to this saw in a couple days.

 

[awol]

that's all I got for now. been working on redbulls 661's. i'll get back to this saw in a couple days.

You gonna bring this one to Iowa Saturday? I'm delivering a few of 'em that weekend.......