stihl 066 porting

[jmssaws]

On a 66 you can cut just enough to get the exhaust down and have 200lbs or you can max the skirt and have lots more.
030 to 070 depends on what you want from the saw.

 

[jmssaws]

Where you want the intake to land.

I fill everyone so I don't worry with that.

 

[jmssaws]

Pics of the muffler mod?

 

[Red97]

I fill everyone so I don't worry with that.

Still gotta try that..

 

[Canadian farm boy]

So if you have a certain set of numbers you want to use on the jug do you have to degree it first and then cut the squish and base?

 

[Red97]

View attachment 13626

Not the one I was hoping for

That does look nice tho.

 

[jmssaws]

So if you have a certain set of numbers you want to use on the jug do you have to degree it first and then cut the squish and base?

I rarely check the timing on a stock cylinder. I'll check the squish and cut it for the compression I want and set port timing.

 

[huskihl]

Not the one I was hoping for

That does look nice tho.

I didn't take pics, but mine is like @Moparmyway's

 

[drf256]

@jmssaws My big question is how do you know how much you need to cut from the squish and base? Is this just something that comes with experience on a certain model or is there a science behind it?

A bit of both Mike.

How much you can take max out of the band is determined by where your piston will Freeport and how much support the piston skirts have. Then you figure out base squish and base compression, then estimate what your comp will be with X out on other builds. You also wanna consider where your exhaust will land, where you wanted it to land, and where your intake will land when you cut the base.

I know that's clear as mud. I did my best.

 

[Moparmyway]

Lemme help here, I know a guy who makes killer deflectors, and I know a few guys that can TIG weld them pretty good too

 

[Red97]

Lemme help here, I know a guy who makes killer deflectors, and I know a few guys that can TIG weld them pretty good tooView attachment 13632 View attachment 13628View attachment 13630View attachment 13631

Those do seem to fit really well on the 066/660 mufflers.

Thanks for the pics.

 

[jmssaws]

I used a couple of those deflectors the other day and forgot to take pics. Sorry

The circle crank saw I'll use one and post pics. Only have one left

 

[Moparmyway]

Those do seem to fit really well on the 066/660 mufflers.

Thanks for the pics.

I'll need some more.......large ones please, 20 will work and please pm me with the total including shipping

Thank you Sir !!

I love these large deflectors !!

 

[Red97]

Only have one left

Rut roh...

 

[Moparmyway]

Rut roh...

I'm out, had to TIG one of the small ones on a 440 today, didn't look right, really looks better with the large ones too ........ I slacked off on asking for more

 

[jmssaws]

These deflectors are a home run, perfect size with a good flange for welding.

 

[drf256]

I'll need some more.......large ones please, 20 will work and please pm me with the total including shipping

Thank you Sir !!

I love these large deflectors !!

Red's defectors are great.

@Red97 is there anyway you can tool up an "in between size"?

I find my self wanting your larger deflector, but not being able to fit it on smaller saws.

 

[Deets066]

@jmssaws My big question is how do you know how much you need to cut from the squish and base? Is this just something that comes with experience on a certain model or is there a science behind it?

Run the piston to exact TDC mark the piston at the bottom of the exhaust port.(I use a scribe) then when you pull the jug you can measure from the line you scribed to the bottom of the piston skirt, and that is the max amount you will be able to drop the jug without free porting

 

[Red97]

Red's defectors are great.

@Red97 is there anyway you can tool up an "in between size"?

I find my self wanting your larger deflector, but not being able to fit it on smaller saws.

Front to back dimension is to deep?

Same size without the ramp leading up to the opening?

 

[wigglesworth]

I rarely check the timing on a stock cylinder. I'll check the squish and cut it for the compression I want and set port timing.

I degree em all first. Too many variances...