stihl 046 D cylinder?

[MustangMike]

Since there are NO 044/440 D combustion chambers, are you sure your 046 is a D chamber?

I think those hybrids run so hard they slot the holes!

 

[idiotwithasaw]

i can post some pics tomorrow of two known 52mm 046/460 cylinders tomorrow and let you decide. the cylinder that i mistook as a 046D is actually a 50mm 044 cylinder, since it doesnt have a decomp hole that should have been my first clue but for some reason i missed it, was in a hurry and it was dark.

 

[Trx250r180]

Since there are NO 044/440 D combustion chambers, are you sure your 046 is a D chamber?

I think those hybrids run so hard they slot the holes!

From what i have seen every 044-440 has a D jug

 

[Deets066]

Yeah I think you got that backwards mike, all 44 jugs are D

 

[Moparmyway]

Since there are NO 044/440 D combustion chambers, are you sure your 046 is a D chamber?

I think those hybrids run so hard they slot the holes!

From what i have seen every 044-440 has a D jug

Yeah I think you got that backwards mike, all 44 jugs are D

Here is mine .............. early 12mm slant fin

 

[MustangMike]

My bad, I did not know that! Never seen it posted before, and I have never taken a cylinder off. Learn something every day!

No wonder they run so good!!!!

 

[KenJax Tree]

I prefer DD jugs

 

[Moparmyway]

 

[idiotwithasaw]

 

[blsnelling]

dave is a good guy. but in still confused on one part will a 10mm jug fit a 12mm saw or vice versa?
also how can you tell a 10mm vs 12mm slant jug?

A slanted fin cylinder is a slanted fin cylinder.

You cannot use a later non-slanted fin jug with a piston from a slanted fin saw. The ring end location pins in the piston are different. However, you can use a slanted fin cylinder with either old or new piston.

 

[blsnelling]

The mythical reputation of the D-chambered 046 cylinder actually comes from the superior port timing found in first production years cylinders, more so than the shape of the combustion chamber. Any OEM 046/460 cylinder can be ported to run fantastic.

 

[Trx250r180]

The good 044 jugs have this stamp on top ,see the ks in the top lh corner ? And the fins are angled on top of the jug .
The early saws had a little heavier flywheel also which helps tourque a little .

 

[Definitive Dave]

A slanted fin cylinder is a slanted fin cylinder.

You cannot use a later non-slanted fin jug with a piston from a slanted fin saw. The ring end location pins in the piston are different. However, you can use a slanted fin cylinder with either old or new piston.

Ok one more silly question, if you have an original OEM slant fin jug and piston on a saw but the piston is a little iffy, would it be better to clean up the original piston or just use a new OEM piston? Any difference performance wise in the early and late pistons in the same early jug?
thanks
Dave

 

[blsnelling]

Depending on what you call iffy, I would probably go with a new piston.

 

[idiotwithasaw]

Thanks brad for clearing that up. So the older "better" slanted fin will work on the newer saws but not the other way around.

 

[idiotwithasaw]

dave are you concerned about the ring pin placement on the newer piston?

 

[blsnelling]

dave are you concerned about the ring pin placement on the newer piston?

That shouldn't be a concern.

 

[idiotwithasaw]

see how bad my memory is you already stated it in the same thread. for some reason i had switched it around.

 

[Definitive Dave]

Depending on what you call iffy, I would probably go with a new piston.

gotcha, the exhaust side doesn't still clearly show the oil grooves but no vertical lines either, more of a scuffed up appearance.
Replacement is the plan. I didn't ask the question very well, I wanted to make sure there wasn't some super-piston qualities that the early version possessed that I would be missing by swapping it out.
thanks
DD

 

[Toad22t]

Bump because I wanna hear the answer to Dave's last question!