Post up your ported cylinder Artwork

[huskihl]

kevin,
how are you able to get that 4" grinder in there and do such a clean job? asking for a friend....

Gotta let the wheel wear down to just the right size.

 

[Deets066]

 

[Deets066]

More of just a clean up, de-carbon, blend than anything. I wouldn’t really call it ported

 

[00wyk]

Just adding a couple of eyebrow/L Ports to a lil ole Dolmar 420. Makes a big difference. Don't fuggit up, tho. It's a 200$ cylinder.

 

[Deets066]

got the second one finished up

 

[NPKenny]

Just adding a couple of eyebrow/L Ports to a lil ole Dolmar 420. Makes a big difference. Don't fuggit up, tho. It's a 200$ cylinder.

More pics, please!

 

[David Young]

Just adding a couple of eyebrow/L Ports to a lil ole Dolmar 420. Makes a big difference. Don't fuggit up, tho. It's a 200$ cylinder.

Yikes they are proud of them huh?

543xp cylinder is 30 bucks. Crazy difference.

where is the ring end located.

Clean looking work

 

[00wyk]

Yikes they are proud of them huh?

543xp cylinder is 30 bucks. Crazy difference.

where is the ring end located.

Clean looking work

The ring end is a bit to the side, so you can't make the brows too big. They needn't be very large anyways. It is much smaller than you'd think. Just enough to throw some charge up towards the intake side, which is sorely lacking on the 4300/421/420. It's a trick I picked up after seeing a lot of RC guys doing the same with their open ports. They go a bit over board with theirs, tho. You can beat up the rings going too far.

 

[00wyk]

More pics, please!

It's kinda sitting on a saw at the moment. I'll try for more pics next time. I almost didn't take pics in the first place. This was just to show the owner what I was up to. I didn't try this on the last one I ported for him. It really helped wake it up.

 

[NPKenny]

It's kinda sitting on a saw at the moment. I'll try for more pics next time. I almost didn't take pics in the first place. This was just to show the owner what I was up to. I didn't try this on the last one I ported for him. It really helped wake it up.

Understood. Am I correct in understanding that you only widened the top of the uppers on the intake side, toward the intake? Did you raise that eyebrow above what would be the main upper? Thank you!

 

[00wyk]

It is a modified primary. Here's a pic of the first one I did. The ring end is marked with an X(I think this image may be flipped, so the ring end may be on the other side of the cylinder...). I do not make such a large rut going in to it nowadays, it's maybe 3/4 this size. So the first one I did was rather large. It works fine. I just am not comfortable having that much port for the ring to fly over. This pic was taken about 3/4 the way done, so I was also a bit apprehensive showing it since it is undone work. The other ports are untouched here. Overall, though, the eyebrow seems to work well opening a degree or two before the original primary and other ports. It likely works fine opening at the same time, but I like adding a couple of degrees to protect the ring so it slopes up from the end of the primary. It seems to scavenge fine either way. But it certainly makes her more eager to rev over stock ports placement over all.

Here it is cutting an 80 year old, stupidly hard, fully seasoned oak limb for it's first cut:

 

[huskihl]

Not a Picasso, but it taint bad

 

[oldbitz]

Porting of 2 strokes is alchemy to me, I've never been able to get my head around it.

 

[huskihl]

Porting of 2 strokes is alchemy to me, I've never been able to get my head around it.

Me neither. Just keep trying different shît til ya get it

 

[Outdoors]

Excellent thread here! I appreciate the pictures of all the artwork.

 

[00wyk]

Yikes they are proud of them huh?

543xp cylinder is 30 bucks. Crazy difference.

where is the ring end located.

Clean looking work

Thanks for the compliment. I shoulda taken a pic of the last one I did. It's purdy. Nice and tight. I found a trapezoidal bit and it works wonders doing this stuff.
Funny you should say that about the 543(which is a Zenoah, right?). I was looking at the cylinders the RC guys were modding and thinking on some of them, 'that's gonna beat spit out of the rings. How much do those things cost in the RC world?'. Turns out it was a Zenoah engine I was looking at.
If you don't want to direct it so sharply towards the intake side, you can simply make a cut using a round or egg-shaped bit. The piston isn't gonna sit down so far in to the cylinder that it will catch on the shape of the port. But I think contouring the transfer a bit like I did will help to direct flow more and be even easier on the rings. On the RC cylinder they only wanted more power at the same or slightly higher RPM. On this one, I wanted to move the power up in the band as much as possible without adding more exhaust, and make it more responsive to the trigger.

 

[redlight066]

Just a little nip and tuck for a MS200

 

[redlight066]

More stuff

 

[redlight066]

562xp.

 

[00wyk]

It is a modified primary. Here's a pic of the first one I did. The ring end is marked with an X(I think this image may be flipped, so the ring end may be on the other side of the cylinder...). I do not make such a large rut going in to it nowadays, it's maybe 3/4 this size. So the first one I did was rather large. It works fine. I just am not comfortable having that much port for the ring to fly over. This pic was taken about 3/4 the way done, so I was also a bit apprehensive showing it since it is undone work. The other ports are untouched here. Overall, though, the eyebrow seems to work well opening a degree or two before the original primary and other ports. It likely works fine opening at the same time, but I like adding a couple of degrees to protect the ring so it slopes up from the end of the primary. It seems to scavenge fine either way. But it certainly makes her more eager to rev over stock ports placement over all.

Here it is cutting an 80 year old, stupidly hard, fully seasoned oak limb for it's first cut:

Here she is tuned to just north of the rev limiter: