Stihl 046/460 D Jug. Are there benefits using it on a 460, or better using it on a Hybrid?

[RI Chevy]

I am just curious about 046/460 D jugs. What benefits do they bring to a saw build? Are they better than a regular 046/460 jug? Do they increase a saws performance?
Or would a D jug be better off used in a 044 Hybrid build?
Just curious, as I really don't know much about them. I don't really know what benefits they would give to a saw. Other than increase compression.
Open to hear everyone's input. Specifically the engine builders opinions.
@jmssaws
@mdavlee
@Mastermind
@drf256

 

[stihl saws]

Something I've always wondered too.

 

[mdavlee]

I like a round chamber.

 

[RI Chevy]

Any benefits of the round chamber Mike?

 

[drf256]

I like a round chamber.

Any benefits of the round chamber Mike?

For me,

More room to fool around and still have OK compression.

Also more concentric burn.

Depends more on what numbers a jug starts out at than the chamber itself.

 

[dall]

i like the round cylinder as well

 

[dall]

Top picture of the 046 when I changed piston
Bottom picture of the 046 when al changed it when ported it

 

[jacob j.]

The D-shaped combustion chamber saw is a better runner stock, especially when you have the good early carburetor and the 1309 ignition. Those components were all designed in concert on the early 046s to make a strong running stock saw.

If you're sending it to a builder, then it doesn't matter at all and the round combustion chamber jug is the better choice.

 

[dall]

it had 3 tanks on it when al changed the piston motul800 at 32:1

 

[RI Chevy]

Cool. So the Motul 800 cleaned up the piston? The photo on the bottom?

 

[dall]

that was a new piston that had 3 tanks on it i was showing the burn pattern

 

[RI Chevy]

Ahh. OK. Gotcha. [emoji106]
Was that piston in a round jug? Or D jug?

 

[Chainsaw Jim]

There's a lot more squish with D jugs.

 

[dall]

Compression on it now I think that's enough

 

[Chainsaw Jim]

In my experience with both, the D were the better performers.

 

[TJ the Chainsaw Mechanic]

View attachment 54586

Compression on it now I think that's enough

I think it needs a little more......

 

[jmssaws]

I can't tell any difference in them but the best running one I've done is a 2009 round chamber stihl cylinder.

 

[drf256]

If I want to get the transfers down in the bore and need to take a lot out of the band to do so, I want the bigger chamber. And vice versa.

 

[Deets066]

Not all D chamber jugs had good numbers, but some of them had awesome timing in stock form I think my hybrid jug was 101-120-75 stock

 

[mdavlee]

That is true. The one Dall has now was around those numbers stock.