Stihl 066 port numbers

[Dave064_440]

Im looking for a list of measured port timing numbers of all cylinders in unaltered form. Any aftermarket or oem cylinder 064,066, and ms660. If there is already a list please post the link for me. Thanks

 

[drf255]

That’s unobtainium. Even OEM cylinders vary in timing, with some models having vast differences.

What you’re looking for doesn’t exist.

 

[Dave064_440]

That’s unobtainium. Even OEM cylinders vary in timing, with some models having vast differences.

What you’re looking for doesn’t exist.

I understand that they are going to vary some. I have measured my 064 ks cylinder and my ms660 stihl cylinder. I would like some other measured numbers for a comparison stand point.

 

[mdavlee]

I understand that they are going to vary some. I have measured my 064 ks cylinder and my ms660 stihl cylinder. I would like some other measured numbers for a comparison stand point.

I’ve seen as high as 93 and as low as 100 on 066/660 jugs with 18-28 degrees of blowdown with intake running 76-83.

 

[Dave064_440]

I’ve seen as high as 93 and as low as 100 on 066/660 jugs with 18-28 degrees of blowdown with intake running 76-83.

My 2 cylinders are I that range. I'm curious what the Cross MM cylinder measures and the Meteor. I'd like to find a 066 cylinder closer to my 064 ks 100/125/73 with .025 squish uncut.

 

[Yotaismygame]

My 2 cylinders are I that range. I'm curious what the Cross MM cylinder measures and the Meteor. I'd like to find a 066 cylinder closer to my 064 ks 100/125/73 with .025 squish uncut.

Lower exhaust works better on a 064 and 066. If you dropped that jug it would be better. 103/128/76 would be nice.

 

[Dave064_440]

Lower exhaust works better on a 064 and 066. If you dropped that jug it would be better. 103/128/76 would be nice.

I was thinking of trying to get ks cylinder closer to 102/122/78

 

[Yotaismygame]

I wouldn’t do more than 77.5 on the intake and 102.5 on the exhaust. 20bd is fine.

 

[mdavlee]

I personally like exhaust in the 94-96 range and blowdown about 22-25 and intake under 84. Lower than that they don’t idle quite as good. I’ve tried them as low as 103 and didn’t care how tight they feel.

 

[Yotaismygame]

Interesting.

 

[vintage saw fan]

Knowledgeable ones. I’m hoping to can help here. I have a Farmertec MS660 kit that I assembled and I know cheap Chinese stuff. I put a degree wheel on it recently and the numbers are puzzling.
Intake 95 degrees ABDC
Exhaust 95 degrees ATDC
Transfers 123 degrees ATDC
Making the blowdown 32 degrees.
Squish is 0.032”
My question is about the intake, what I do to get 15 degrees off of it to get it close to 80 degrees? I don’t really have the means to cut the base and squish. Is it as simple as lowering the floor of the intake? Thank you

 

[huskihl]

Knowledgeable ones. I’m hoping to can help here. I have a Farmertec MS660 kit that I assembled and I know cheap Chinese stuff. I put a degree wheel on it recently and the numbers are puzzling.
Intake 95 degrees ABDC
Exhaust 95 degrees ATDC
Transfers 123 degrees ATDC
Making the blowdown 32 degrees.
Squish is 0.032”
My question is about the intake, what I do to get 15 degrees off of it to get it close to 80 degrees? I don’t really have the means to cut the base and squish. Is it as simple as lowering the floor of the intake? Thank you

95° ABDC = 85° BTDC

Just don’t make reference to bdc. Use tdc instead

 

[vintage saw fan]

95° ABDC = 85° BTDC

Just don’t make reference to bdc. Use tdc instead

Thank you