064/056 mag11 build

[junkman]

Would a heavier piston be good for a long bar ?

 

[Roadfxr]

I'm enjoying this thread immensely.......

Today I'm doing a few 3120 carbs.........boring stuff.

Couldn't agree more. Amount of knowledge and experience being shared is incredible.


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[Chris Zautner]

A dolmar 166 is 56 mm bore
Partner p100 super is 56 mm bore
Husqvarna 2100 cd is 56 mm bore

 

[jacob j.]

The Partner K1200 piston is an interesting animal- 56mm and I believe it uses a 12mm pin. I bought a NOS one for potentially installing in a Solo 603. I can measure it if needed.

 

[srcarr52]

I used a 395 piston in my pipe saw. The weight of it slowed the saw down compared to the OEM piston. I didn't realize how much till I went back to the OEM top end.

You can safely take 10g off a meteor 395 piston. Takes it from 117g to 107g, stock 2100 piston is 112g. I haven't weighed a 066 piston lately and I don't have it in my notes.

 

[Mastermind]

Would a heavier piston be good for a long bar ?

I can't see a heavier piston ever being a good thing. Although I like a heavy clutch and flywheel on a work saw. It's a reciprocating thing VS a rotating thing.

 

[Mastermind]

You can safely take 10g off a meteor 395 piston. Takes it from 117g to 107g, stock 2100 piston is 112g. I haven't weighed a 066 piston lately and I don't have it in my notes.

I have used them in the 2100, and the BB 066, and did take a bunch of weight off. But in the pipe saw I lightened the OE piston too. So......

 

[jmssaws]

I did a bb cylinder with a 395 piston, it's alright but that's it. Lighter rotating Assembly is better.

I finally got this saw running decent but I'm afraid of the piston so it's only at 12k.
I believe at 14k it will be sporty.
I'm loading a video now

 

[srcarr52]

I can't see a heavier piston ever being a good thing. Although I like a heavy clutch and flywheel on a work saw. It's a reciprocating thing VS a rotating thing.

Yes, reciprocating doesn't work the same as rotating mass, especially on a system with a crank rod. A lighter piston is always better.

 

[spencerpaving]

Lil red barn has aftermarket 056 pistons...I have had good luck with those...I tried a 395 piston even wasted a jug doing by machining the chamber flat...I didn't have good results...it didnt run that well...went and found another jug and put a domed piston back in....this is just my personal experience not saying it can't be made to work

 

[jmssaws]

I didn't want a bunch of compression with this piston so I put the old rings in and even with a ring gap over 050 it's still 190lbs. Lol

 

[awol]

The 066 big bore piston would work if you want a flat top.

 

[jmssaws]

066 bb 394 395 pistons

 

[Mastermind]

Dem BB pistons scare me. I'm afraid they will fly apart.

Have y'all used any that lasted?

 

[jmssaws]

I tach edit after the cut at 11.7
I want to lean it out but I need to look at the piston again before I do

 

[jmssaws]

The 066 big bore piston would work if you want a flat top.

Hello Alan, how are things?

 

[jmssaws]

It's kind of anemic at that rpm so I'm hoping it picks up with a couple thousand more rpm.

 

[awol]

Dem BB pistons scare me. I'm afraid they will fly apart.

Have y'all used any that lasted?

The only ones I have used were for experiments.

Hello Alan, how are things?

Doing pretty good, just real busy!

 

[Chainsaw Jim]

It will be 98.5 cc's no matter what piston you use,crown height doesn't change it.

Only a increase in bore size or stroke will change displacement.

With the taller crown of a 394 you're adding 5mm worth of volume to the cylinder above the exhaust roof which is more cc's. How many exactly I do not know...I made a guess.
A shorter piston used as a direct fit in the 064 case would leave it the 93cc size.

 

[junkman]

With the taller crown you're adding 5mm worth of volume to the cylinder above the exhaust roof which is more cc's. How many exactly I do not know...I made a guess.

If he runs a spacer to raise the jug ,does this still apply ?