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

[Canadian farm boy]

Weisco is forged, lighter, single ring, wider skirts.

64 has narrower skirts but longer

46 is fine, that’s what’s in my hybrid

Have you tried using the 064 piston in a 046 cylinder yet?
I honestly can't think of a situation where I would want to. The longer skirts and the taller crown typically don't lend them selves to the port timing I like plus there's the extra weight. I guess if I wanted to turn a pop up and maybe trim the skirts it would be ok to use.

 

[Deets066]

Have you tried using the 064 piston in a 046 cylinder yet?
I honestly can't think of a situation where I would want to. The longer skirts and the taller crown typically don't lend them selves to the port timing I like plus there's the extra weight. I guess if I wanted to turn a pop up and maybe trim the skirts it would be ok to use.

I have, it ran good but was a little peaky

 

[MustangMike]

I know the Meteor Pistons have slightly wider skirts than the 046/460. Does anyone know if their crown height is different?

I believe the Meteor were taller than the Cross Pistons in the 660.

 

[drf256]

064, 272, wiseco 272

Maybe 7900 also.

The 272 piston is lighter and has a single ring with a pin centered over the intake. Can add fingers if desired.

 

[mdavlee]

Maybe 7900 also.

The 272 piston is lighter and has a single ring with a pin centered over the intake. Can add fingers if desired.

7900 pistons are narrow

 

[Ketchup]

Reviving an old thread here. Building my first hybrid 46/44.

Do 272 and 064 pistons require alterations to fit the con rod?

Has anyone cut one of these to fit a D cylinder?

Will a 044 case feed enough through 460 fingers?

Advice for newbs appreciated...

 

[MustangMike]

My strongest running Hybrid was built by CFB and has an OEM 460 piston and 046 D jug. My strongest running ported 460 (MOFO) also has an OEM piston and 046 D jug … however, there is considerable debate among builders regarding if a D jug provides any real advantage, and I have played with other 460s that seem to run better with a Hemi jug.

The smaller case generally acts the same as crank stuffers, and generally provides higher RPM operation. My Hybrid likes the HD-11 (70 jet) carb, but my ported 460 likes a HD-50 (461 carb). None of my other saws like the HD-50 carb, I can not explain this phenomena, it is just the result of testing.

I have a good running MOFO Hybrid with a cut 272 piston and double base gasket. The resulting 272 piston is lighter than an OEM 460 piston, so it should balance better with the 044 crank and last longer, but it is a lot more work.

I have also played with some AM 440 big bores, and performance seems to improve with bridge ports.

That is all I got, others with more experience can chime in. (Just make sure your 044 is a 12 mm saw, 10 mm saws will not work for hybrid conversion).

 

[Canadian farm boy]

Reviving an old thread here. Building my first hybrid 46/44.

Do 272 and 064 pistons require alterations to fit the con rod?

Has anyone cut one of these to fit a D cylinder?

Will a 044 case feed enough through 460 fingers?

Advice for newbs appreciated...

I just finished a 044 hybrid build using a meteor 272 piston. No modifications were needed for fitting the con rod but I did have to turn down the piston crown approx .030”. In stock form the 272 piston crown is about .100” taller compared to a 046 piston.
To fit the 272 piston doubled up the cylinder base gaskets, cut .030 from the squish band and cut .030 from the piston crown. My resulting squish clearance was .018”. I did not cut the cylinder base at all.
Every cylinder and saw is different so be sure to measure and adjust as needed for your saw.

I don’t like to use fingers on a work saw. The transfers will have plenty of flow after porting if they are aimed and timed well.

 

[Lightning Performance]

I agree about no added transfers on work saws if
possible.

Your above post was my next question after running a ported 046 today.
272 or 064...leaning to 272 for one of my 046's.

Today a mild to me, ported jug I did real quick last month or so ago, 046 non D is coming around a bit. Did not hone it just ported and finished by hand for a smooth transition at the jug wall. Both rings. It will take 20-30 tanks to seat up. The jug had nice plating, it was on straight and had very nice transfer exits. These transfers are still not flat, no machine work, base gasket delete, no ignition advance, stock carb, port widened to within 3mm on an OEM slug. Lots of intake work but only using about 78* there. It wants more after tank six running a 7pin 28" 050 RS with an HO pump. Muffler is OEM gutted, dual port now and big holes with no screens. It will pull a thirty two with more intake. Chain is grrrrabby off this fresh roll, yeah! Picked, flopped and chopped up a sugar maple about 36 dbh, hard mfer to.
The new piston was a beauty, no toucheded it. It sounds pent up a bit now. Did not raise the exhaust, yet. Saw is out of carb at 2 turns, needs more or a bigger jet and fiddle with the lever height.

Are you guys and gals running the intake baffle plate?
This saw, it is in there.

Four jugs waiting for my hybrid. Cases are go and the bearings were toastededed, fell out. China things they were. China jug to. It ran good considering the bearing cages were long gone, bye bye

Crank is as sweet as it can be. Con rod blue and purple top to bottom. Could be factory, dunno. Time to build the too many hats saw. I got muh spinny thingy so...

Two good and tight OEM 046 bottoms, plenty of jugs and the 044 hybrid for me All mine are getting oversized carbs. It just seems easier than all that reworking one imo.

 

[RI Chevy]

What's wrong with using an 046/460 piston in the 046/460?
I think my non D jug MOFO 460 runs very well...
Just saying.

 

[MustangMike]

The Hybrid is lighter Jeff. It is like the hotrodders putting the bigger motor in the smaller car.

 

[RI Chevy]

Yes Mike I agree. But I was just asking a question...

 

[Ketchup]

It doesn’t sound like anything is wrong with the 46 piston. That maybe the direction I go.

But who doesn’t want to throw a husky piston into a stihl hybrid? I was thinking the 272 slug might provide more exhaust width and fingers could help scavenge a popup. Probably too ambitious for a first go but...

What’s this talk of a bigger carb? Wj69? Wg12? Don’t the linkages become a hassle?

Thanks for sharing your experiences guys!

 

[mdavlee]

Reviving an old thread here. Building my first hybrid 46/44.

Do 272 and 064 pistons require alterations to fit the con rod?

Has anyone cut one of these to fit a D cylinder?

Will a 044 case feed enough through 460 fingers?

Advice for newbs appreciated...

Best I remember you have to widen the pin area on the 064 to get it to fit the 460 rod

 

[Ketchup]

I thought I read that somewhere as well.

I measured the skirts on a 460 and a tecomec 272 piston today. The tecomec was only .018 wider. Wish I had a meteor to measure as well. The 272 piston fit right over the con rod.

 

[Canadian farm boy]

I thought I read that somewhere as well.

I measured the skirts on a 460 and a tecomec 272 piston today. The tecomec was only .018 wider. Wish I had a meteor to measure as well. The 272 piston fit right over the con rod.

Meteor 272 piston skirt width is almost identical to the 046 piston. The 272 skirts are ..040” ish shorter iirc.

 

[MustangMike]

Meteor 460 piston skirts are wider, I don't remember how much, but OEM piston is lighter (which may be more important if your doing a Hybrid).

 

[blsnelling]

I'll take the OEM piston and don't really care which generation of cylinder it is. It's in the porting, IMHO.

 

[RI Chevy]

YES

 

[Deets066]

I'll take the OEM piston and don't really care which generation of cylinder it is. It's in the porting, IMHO.

For the most part, yes.