066 Rebuild, Port Job etc

[Redfin]

There dang sure is a fine line......

Lots of variation on these jugs. I had .01" of the land showing on intake and about the same before freeporting.

 

[Brewz]

Oh I am learning here folks but I plan to get really good at this.

When you say free porting, are you talking about the bottom of the piston skirt opening up the bottom the the exhaust port at TDC?

 

[huskihl]

Oh I am learning here folks but I plan to get really good at this.

When you say free porting, are you talking about the bottom of the piston skirt opening up the bottom the the exhaust port at TDC?

Yep

 

[paragonbuilder]

Oh I am learning here folks but I plan to get really good at this.

When you say free porting, are you talking about the bottom of the piston skirt opening up the bottom the the exhaust port at TDC?

You got it!

 

[paragonbuilder]

Yep

Beat me too it!

 

[Brewz]

Ok I will spend some time measuring and checking to try and stop this happening

I love learning stuff

 

[paragonbuilder]

Ok I will spend some time measuring and checking to try and stop this happening

I love learning stuff

Lot of pics!!!

 

[paragonbuilder]

We all like learning!


Sent from my iPhone using Tapatalk

 

[Brewz]

Measured it up today.

Set the piston at TDC and scribed a line on the piston skirt along the bottom of the exhaust port.

I then went to BDC and did the same along the top of the intake port.

.070 will hide 3/4 of the ring stopping it from catching on the top of the intake.

I have .117 before free porting happens so with .070 off the base, I still have .047 before free porting up my sleeve after the base has been machined.

That means only .030 off the squish which sounds more realistic

 

[Brewz]

Plenty of space before it free ports



Do my numbers look ok?

 

[Brewz]

I just realized I will need to find some soft wood and get a square filed chain to make it cut fast in the video's when I am done

 

[Moparmyway]

Yup, the numbers are in the correct area.

 

[paragonbuilder]

I just realized I will need to find some soft wood and get a square filed chain to make it cut fast in the video's when I am done

Just hollow out the middle of the log and position the camera right! Lol

 

[Deets066]

Plenty of space before it free ports

View attachment 22179

Do my numbers look ok?

machining numbers sound about right, every cylinder will be different.

Have you taken port timing numbers yet?

 

[Brewz]

Stock with OEM jug and slug
95
117
81

 

[Deets066]

Stock with OEM jug and slug
95
117
81

Those high trans are really gunna help you.

Timed it with the 288 piston yet?

 

[jmssaws]

After machine work I'm guessing you will have
98 123 84 and you will want to leave it there

 

[Brewz]

Arranged to go spend some time on a mates lathe to cut the 066 jug.

Fingers crossed I dont kill it.
Advantage is I have the day off, am in no rush so can spend the time to do it right.

 

[Brewz]

Got my mandrel for cutting the base made but could not get the jug squared off properly without a long reach dial guage to square up the band.

Will have to buy one and go back another day

 

[drf256]

Got my mandrel for cutting the base made but could not get the jug squared off properly without a long reach dial guage to square up the band.

Will have to buy one and go back another day

You can square it up by moving the tool close to it and using a feeler gauge. Rotate and measure the distance on all 4 corners. Get it equal and clamp it down.