MS 460 first time portting

[X 66 stang347 X]

View attachment 34757I started porting on the exhaust side first. I didn't do any measuring other than getting my width no closer than 2mm of a skirt end or a ring end. So I ended up taking 1.3mm off each end. I was more concerned about the width and shape for now. It's still alittle rounded but I felt kinda rushed.
I hate to say I only used a dremel with different bits. I probably need to slow down and use some files next time.
This is how it marked out on the intake. The port is offset some I can't go wider on right side

View attachment 34758
I made my marks on a heavy piece of plastic that's straight on all edges. It made it easy as I could see through it and line up on the port edge and I had flush against the squish so it's straight. Not sure if there's a better way but that's what I came up with.

I chamfered the port I just need to hit it with a little 220. And the transfer I blended. I know I hit the side with the stone. Man

Smoothed and blended the transfers.
View attachment 34760

I cleaned up and tapered the piston widows, got the squish at .019 I had to take .005 off the base with sandpaper and a peace of glass rotating every 10 strokes. I fired it up and it sounds good with fast crisp throttle response.

Got it all back together and it pulls hard. I have it tuned at 14,200. Can't wait to start on the 064. Is there anything I could do to improve what I did or any tips I would appreciate it

 

[X 66 stang347 X]

ill put the pics up when i get home some how they didn't make it in the post.

 

[X 66 stang347 X]

Got my timing set at 7 degrees

 

[SixGun]

finished exhaust looks sweet.
Don't go crazy hogging out the intake as I burned through the indent once. Finish intake with 80 grit or so sanding.
Looks great so far

 

[X 66 stang347 X]

finished exhaust looks sweet.
Don't go crazy hogging out the intake as I burned through the indent once. Finish intake with 80 grit or so sanding.
Looks great so far

I left it finished with the sanding roll so it was ruff I wish I took a pic. I only opened the intake by a mm on left side It was already close to the skirt on the right. I didn't really open it much just smoothed mostly

 

[drf256]

Welcome bud.

Much more usable and friendly info here than on the AS, especially on porting.

 

[mdavlee]

Got my timing set at 7 degrees View attachment 34763

Which timing is set at 7°?

 

[X 66 stang347 X]

Ignition is 7° advanced

 

[X 66 stang347 X]

Welcome bud.

Much more usable and friendly info here than on the AS, especially on porting.

Yeah, I recognize a lot of the members names from my past reading of old post. I just didn't realize.

 

[MustangMike]

Ignition is 7° advanced

Is that about 20/1000 off the key?

 

[X 66 stang347 X]

I think It was close to that. I didn't take a final measurement after i got it where I wanted it. I smacked the flywheel to set it on the taper and tightened the nut.

 

[Ryan Browne]

Nice pictures!

I'm curious, did you map out the timing on your degree wheel before doing this, and if so, did you change any numbers, or leave the heights alone?

I'm working up the gumption to port my first cylinder in the near future. Seeing other people's work is really helpful!

 

[X 66 stang347 X]

I left the heights alone other than shaving .005 off my cylinder for my squish. This was my first attempt and I did over a weeks worth of reading on what I did do. The hardest part is the technique and I didn't want to make my own mistakes and learn from others because I didn't want to trash this Mahle cylinder. There's a lot of little things you must know And plenty of people to help

 

[X 66 stang347 X]

I'm runing stihl ultra at 40:1 90 oct E-0 and a cj6 plug. I might go with 32:1. Would anyone change the plug I went a little cooler