Post up your ported cylinder Artwork

[Nutball]

So far so good. Put a half hour runtime on it last night. Ring pin is centered over the intake port. I saw it on the internet so it's gotta work right? LOL

I actually got to thinking last night about how wide I make transfer ports sometimes. I was going to check some of the cylinder kits I've practiced on today.

My concern with your cylinder was if the upper transfer is flat across the top and wide enough, it could catch a ring.

How wide does a flat port edge have to be to catch a ring? It would be nice to have a rule of thumb for the limit of width and minimum radius to avoid catching a ring.

Most rings have rounded edges which will wear off until it sharpens them razor sharp (even near 90 degrees). Then maybe that could cut away at a chamfer until it slams to a stop.

 

[82f100swb]

I did a good bit more work blending and chamfering after I took that picture. We will see how long it lives.

 

[Ketchup]

In the case of a transfer upper the ring is also expanding into the exhaust port and the other transfer at the same time.

If 70% of bore is the ragged edge of port width, seemingly 45% of bore would be a dangerous amount of flat port roof. I’m not sure how multiple ports changes the equation. In the case of transfers more volume isn’t necessarily better so going wide might be a problem even if the rings are fine.

But hey, fingers and bridges are fun! Looks cool! I hope it rips.

 

[82f100swb]

This was entirely a junk off of the shelf build. Cases and tank were my ugliest 61 set that wouldn't have been saleable, top cover is aftermarket junk that didn't fit anything.
This is entirely just for fun. If she stays together I may build a pipe for it.

 

[huskihl]

Little 395 bumpity

 

[Agent Smith]

Husky three fiddy

 

[drf256]

046 jug for a hybrid. This is one of those D jugs that had perfect transfers after machining at 121*. Smoothed some stuff out, but tried to not remove too much from the transfer tunnels. The intake roof is untouched, but that chip still needs to be chamfered. Should be a runner.

I may still “Deeter” the lowers. Deciding.

 

[drf256]

 

[Robert Krogh]

Husky three fiddy

View attachment 282247 View attachment 282248 View attachment 282249 View attachment 282250 View attachment 282251

That is some clean work, well done !

 

[Agent Smith]

That is some clean work, well done !

Thank you sir!

 

[Mattyo]

Some really pretty work gents....inspiring for sure.

 

[MustangMike]

Al, is it an optical dilusion, or did that jug have a real flat exhaust roof?

 

[drf256]

Al, is it an optical dilusion, or did that jug have a real flat exhaust roof?

I’d say illusion. You can see the original curve if you look at the flat line I scribed. It’s nothing like a 10mm 044 or 034S factory roof.

 

[MustangMike]

Thanks Al.

I see it now.

 

[Redfin]

I may still “Deeter” the lowers. Deciding.

Wazzat mean?

 

[drf256]

Wazzat mean?

Think buddy......

You've seen his.

 

[Agent Smith]

Think buddy......

You've seen his.

You talking about taking care of the lip on the lowers?

 

[Canadian farm boy]

562xp

 

[CJ Brown]

Every time I pop into this thread I am amazed at the quality of work that the pros here put out - outstanding!

 

[Egg Shooter]

2 stroke intake Race porting courtesy of Tecumseh...