Raffle 262 builds

[CJ Brown]

Easy to see how a Unicorn saw is born. Look how far apart those port timings are.

Now... to find the "perfect" numbers...

 

[paragonbuilder]

Great stuff Dan! Did you double check that base to intake measurement on the first KS cylinder? It seems out of place with the other cylinders.

Yes, @Johnmn did some mild porting on that cylinder, so the numbers are definitely not stock. And #3 the exhaust was touched
Everything else is stock


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[paragonbuilder]

For those of you that are interested, here are the results of all my math...

I used .035 as a stock squish because that’s what I’ve seen mostly. Then I did numbers if I set squish to .020 with the stock cylinders.
Any questions ask. As there are a lot of numbers on this page [emoji57]


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[paragonbuilder]

Easy to see how a Unicorn saw is born. Look how far apart those port timings are.

Now... to find the "perfect" numbers...

Yes these numbers are all over the place! Wow!!!


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[paragonbuilder]

Cylinder 4 only has 9-12 degrees of blowdown ...


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[Sleeper]

Dan, just as a reference (as I know that it varies due to different saw port designs and such) what is the typical numbers for the most torque?

I understand that it's hard to nail it down to exactly right for every saw, since it's not really possible... but books on this stuff have recommendations.

 

[paragonbuilder]

Dan, just as a reference (as I know that it varies due to different saw port designs and such) what is the typical numbers for the most torque?

I understand that it's hard to nail it down to exactly right for every saw, since it's not really possible... but books on this stuff have recommendations.

That is a very loaded question...
Saw size and design factor in. Case volume changes things...
The way a guy grinds matters...
There really is no answer to that question.


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[RI Chevy]

Whew! Lotsa numbers there. That's why I buy my saws from reputable builders. LOL
Much easier for me. [emoji106]
Gotta respect saw builders.
I am sure Dan will do good with these Hooskies. [emoji2]

 

[XP_Slinger]

Wow, those numbers are all over the place. Looking forward to seeing what you do.

 

[paragonbuilder]

Whew! Lotsa numbers there. That's why I buy my saws from reputable builders. LOL
Much easier for me. [emoji106]
Gotta respect saw builders.
I am sure Dan will do good with these Hooskies. [emoji2]

Well that is 6 different jugs Jeff
I’m hoping it helps some to see how just a little grinding can change numbers quickly.


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[tree monkey]

Wow, those numbers are all over the place. Looking forward to seeing what you do.

they looked to be organized to me

 

[RI Chevy]

Well that is 6 different jugs Jeff
I’m hoping it helps some to see how just a little grinding can change numbers quickly.


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I hear you. I know and respect my abilities. I am just a STIHL saw user and maintainer. Lol
Nothing but respect for all you saw builders. [emoji106]

 

[XP_Slinger]

they looked to be organized to me

You, you’re good you. Lol!

 

[CJ Brown]

For those of you that are interested, here are the results of all my math...

I used .035 as a stock squish because that’s what I’ve seen mostly. Then I did numbers if I set squish to .020 with the stock cylinders.
Any questions ask. As there are a lot of numbers on this page [emoji57]


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Just got to look at this work - nice job Dan! I am wondering why your intake number didn't change .015 in the "goal" section of your spreadsheet?

 

[malk315]

I wonder what the saw factories use for acceptable ranges for all of these numbers for stock saws. i.e. when Mahle or KS create cylinders for Stihl or Husky there must be some tolerance cylinders must meet or they will not be used. There is a lot of variability, but if the various numbers are all w/in some range it must translate to consistency yes? This I am not so familiar with. But very interesting to see! Dan I'm glad you were able to dive in on this and share all of the info -- awesome job.

 

[huskyboy]

I wonder what the saw factories use for acceptable ranges for all of these numbers for stock saws. i.e. when Mahle or KS create cylinders for Stihl or Husky there must be some tolerance cylinders must meet or they will not be used. There is a lot of variability, but if the various numbers are all w/in some range it must translate to consistency yes? This I am not so familiar with. But very interesting to see! Dan I'm glad you were able to dive in on this and share all of the info -- awesome job.

I know there’s A, AB and C pistons with matching cylinder.

 

[paragonbuilder]

Just got to look at this work - nice job Dan! I am wondering why your intake number didn't change .015 in the "goal" section of your spreadsheet?

My math was off a bit...[emoji33]
It’s a lot of numbers in a day.
Usually I just do one cylinder.

I can’t guarantee there are no other mistakes. But I think it gives a good idea of the differences in cylinders.

I think that is right now


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[RI Chevy]

Your fired! Lol

 

[paragonbuilder]

Now using the measurement method I can calculate raising the exhaust to 108 which is my goal in this case and know what I need to cut out of the squish to get there.
To be at 108, I need to be .955” or 24.264mm from the top edge of piston at TDC to the top of the exhaust port. Right now I have .924” or 23.4696mm. So I need to cut .031” or .7944 mm out of the squish, and then cut the base to get back to .020 squish.


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[paragonbuilder]

Your fired! Lol

Lol
I need to get hired to get fired Jeff...


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