440/460 Hybrid question

[juttree]

I recently started working on my first hybrid and have a question about the proper way to mod the outside of the cylinder to make it fit. Does it matter if I grind a bit off each side without measuring or will I have a problem with the cylinder sitting square or true to the piston? Also, the same question for the bolt holes, just open them up or will I have issues?

 

[mdavlee]

Lay the gasket off the 440 on the base and center it up. You'll have to test fit the cylinder to see where it hits. They'll be small difference in where they hit and how much to take off to clear

 

[MustangMike]

I believe there is a thread by AdirondackStihl that details how to do it. I would check it out.

Some guys use the 440 bolts, others drill & tap and use the 460 bolts. In either case, the cylinder holes must be slotted.

 

[MustangMike]

Here you go:

http://opeforum.com/threads/440-460-hybrid.599/

 

[mdavlee]

I just use the 440 bolts.

 

[juttree]

Yep, sometimes me brainy no worky. All this time I had a damn template (the gasket) and didn't even think about that.
Thanks guys, I'm loving this new site.

 

[Deets066]

Yep, sometimes me brainy no worky. All this time I had a damn template (the gasket) and didn't even think about that.
Thanks guys, I'm loving this new site.

Need to do quite a bit of grinding on the outer transfer tunnel to clear the flywheel, especially if you machine the base at all

 

[Definitive Dave]

uhmm port that puppy




and a shameless plug - this will make it easier and a cleaner build
Jeremy designed and prototyped it and Mike has them CNC water-jetted and powders them, all I do is profit
http://www.ebay.com/itm/Stihl-Chain...S440-046-Hybrid-muffler-spacer-/322045028930?

 

[juttree]

uhmm port that puppy

View attachment 20763


and a shameless plug - this will make it easier and a cleaner build
Jeremy designed and prototyped it and Mike has them CNC water-jetted and powders them, all I do is profit
http://www.ebay.com/itm/Stihl-Chain...S440-046-Hybrid-muffler-spacer-/322045028930?

My saw definitely won't look as good as yours, that thing is sweet. All my saws look like underdogs but definitely don't sleep on them.
I'm gonna port this one but will probably run it before the port work so I get a feel for where I'm at.

 

[Definitive Dave]

That other Randy (the zookeeper) stuffed synthetic bananas in mine and it really liked the 30" Cannon Bar in the larger test wood they had set up at the GTG.
Dang thing is so pretty now I need to hire a staff to keep it polished

 

[MustangMike]

I believe the hybrids like different timing than the non hybrids, and they generally rev pretty well but don't usually have the torque of a ported 460.

 

[rattler]

I just use the 440 bolts.

That's what I did works fine.

 

[mdavlee]

I believe the hybride like different timing than the non hybrids, and they generally rev pretty well but don't usually have the torque of a ported 460.

Not really. I used the same numbers for both. Case capacity ends up having more torque in the end.

 

[Glock37]

uhmm port that puppy

View attachment 20763


and a shameless plug - this will make it easier and a cleaner build
Jeremy designed and prototyped it and Mike has them CNC water-jetted and powders them, all I do is profit
http://www.ebay.com/itm/Stihl-Chain...S440-046-Hybrid-muffler-spacer-/322045028930?

That tag is awesome !

now can you start it with that bum shoulder ?

 

[Basher]

I believe the hybrids like different timing than the non hybrids, and they generally rev pretty well but don't usually have the torque of a ported 460.

Raise the compression to around 195 and also raise the upper transfers to 115, you will love your hybrids for a very long time!

 

[Canadian farm boy]

My hybrid is blowing just over 200psi comp. The numbers I used in mine are 102/118/78.

Ms460 jug and a meteor piston with caber rings.

It pulls a 25" bar and full comp 3/8 chisel really well.
4 strokes wot at 14200rpms.

The saw still isnt fully broken in yet. I've only been able to run about 3 tanks of fuel through it so far.

 

[MustangMike]

It runs nice Mike, I got to pull the trigger on it at the GTG.

 

[MustangMike]

Raise the compression to around 195 and also raise the upper transfers to 115, you will love your hybrids for a very long time!

Do you have such a hybrid? Did you port it yourself? Any vids of it?

Thanks.

 

[cgraham1]

Here's the numbers Mastermind used on mine, and it pulls a 28" bar very well. I haven't tried a longer bar yet...

 

[MustangMike]

I would modify the oiler if going longer than 28". Glad to hear you like it.

I believe his #s for the 044 are a little different, although I always request that he focus on torque.