Building a Dome piston

[Husq445]

Just wondering if anyone has done this and what fill rod they used, this is with 4043.

Saw is running Awesome! My ring was shot when these compression readings were taken, new one on the way.

120 stock, worn ring
175 dome, worn ring
? , new ring

Anyway here are the pics of the piston.
They were not quite finished in the photos, but gives you a good idea.


Cant stop Modding my saw!

 

[breymeyerfam]

that is a big dome! how tall? and i've saw one that timberwolf done here recently.

 

[Husq445]

.150 at center

 

[breymeyerfam]

Wow!

 

[blsnelling]

!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[brncreeper]

Nice job, that looks good!

 

[Husq445]

Ported

Heres some pics of the port job that go with.

 

[Hddnis]

Uh oh!

Better get your flame suit before the PPE police show up.



Mr. HE

 

[Husq445]

Wrong pic

yeah wrong pic, was supposed to be another pic of transfer ports
My bad.

 

[Rookie1]

Very nice work. You need to take more pics and show off your skills more.

 

[Ol' Brian]

How much effect do you think the extra weight in the piston will have on how much the saw vibrates? Did you weigh the piston before and after? Just curious.

Excellent work! How did you round off the dome? Did you chuck the piston up in a lathe?

 

[MotorSeven]

How much effect do you think the extra weight in the piston will have on how much the saw vibrates? Did you weigh the piston before and after? Just curious.

Excellent work! How did you round off the dome? Did you chuck the piston up in a lathe?

X2..

and...

175 with a "worn ring"? with new rings will this thing even stay together?

opcorn:

 

[timberwolf]

Looks good. At 2.8 grams a cc and by the looks of it about 2ccs that will make 5 or 6 grams difference to piston weight. Big bore pistons are easily that much mass and work without any noticable balance issues.

A 2 stroke single is only partially balanced so it's not all that critical.

I'd guess the compression will jump about 50 psi by the looks of it. (edit I see thats what it did) Cyl and piston were down 40 psi to start though so fix that up and its going to be well up over 200. might need to shave a little off the top if you want to work with the saw. Also an idea to watch how close the spark plug is to the pop up, get too close and it will turn into a hot spot on the piston.

 

[FATGUY]

how do the old ad new compression figures compare?

 

[blsnelling]

120 stock, worn ring
175 dome, worn ring
? , new ring

Looks like he got 55 PSI out of it.

 

[FATGUY]

Looks like he got 55 PSI out of it.

D'-OH! Maybe I should open my eyes and read first....oops:biggrinbounce2:

Wow, with a new ring, you'll be over 200 fo sure

 

[blsnelling]

D'-OH! Maybe I should open my eyes and read first....oops:biggrinbounce2:

 

[stinkbait]

That looks awesome! I wish that I had the equipment and skills to things like that. The coolest tool that I own is a dremel.

 

[nategyoder]

What are the advantages and disadvantages of popups vs. domed? The domed look like they would be more difficult to do is that why we see more popup style on here? Very cool work!

 

[wigglesworth]

Now thats what Im talkin about!!