I've done it! 80cc+ 044

[yo2001]

My Christmas holiday started early for me this year so this was the project that I completed on Friday. Sorry but the order of the pictures got all mixed up.

First one, the spacer behind the muffler. I used small nuts tig welded in place

Top view without the cover. Some of us might find one thing funny about this picture

A picture of the flywheel side, had to trim the transfer hump just a little bit to clear the flywheel

The clutch side, two widest fins were trimmed back clear the top cover.

The poor man's DP cover. hehe

The complete project

I'm happy with the result. Other than opening up the crankcase to clear the piston and slotting the cylinder mounting holes. Everything was pretty straight forward.

Not much porting was done other than widen the port, port match the muffler, lowering the intake closer to OEM jug, lighten the piston and larger lower transfer ports. Used Stihl wrist pin and clips. The compression is real good at 180 psi with no base gasket. Hope soon I can get side by side comparison with my other 044 which is still 71cc.

 

[Jacob J.]

So this is a BB 046/460 top end on your 044 now?

 

[yo2001]

So this is a BB 046/460 top end on your 044 now?

10-4. Sorry forgot to mention that.

 

[Jacob J.]

10-4. Sorry forgot to mention that.

Let us know how it runs. I've haven't been motivated to put a BB 046 kit on an 044 case because of volume issues.

 

[Longwood]

Looks good, all I can say is that I would love to try it out. :chainsawguy:

 

[forestryworks]

keep us updated

 

[Rookie1]

Nice pics. Good job too.

 

[XJWoody]

Some of us might find one thing funny about this picture

Funny colored decomp button?

Nice work, and looking forward to updates...

 

[volks-man]

Let us know how it runs. I've haven't been motivated to put a BB 046 kit on an 044 case because of volume issues.

jacob:
curiousity:
volume issues = case volume? i'm guesing the 044 case is smaller than the 046? what is the effect of case volume on a saw? again i'm guessing... is it a problem of just not having enough fuel/air in the case to supply the bigger jug? or is it more pulse related?

o/p: very creative engineering. AS member 'madprofessor' would be proud.i too, look forward to your test resuts!

 

[Jacob J.]

Funny colored decomp button?

Nice work, and looking forward to updates...

The Husky decomps work ok in Stihl cylinders although sometimes on the Big Bore kits the Husky decomps won't stay open since they don't pass as much air.

 

[Erick]

I sure like mine.

<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/txs8vI8IBVQ&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/txs8vI8IBVQ&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>


Here's a Stock 660 for comparison.

<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/1PaLe9YIel4&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/1PaLe9YIel4&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>

 

[yo2001]

I do believe the case volume is going to be an issue. In addition, the lower transfers are tiny on the 460 BB kit which won't help the problem. I did work the lower transfers most to get more crank volume for the saw but probably not enough.

Other thing that I notice is that the intake port sits higher than 044 OEM jug. I think both small lower transfers and higher intake ports were consequence of overbore without relocating the ports to original location. Since the intake port is in diagonal from the bore, when you cut out the bore, the intake port naturally goes up if that make sense. The problem is that I don't think there is enough metal to lower the intake port back down.

I forgot again. yes Husky decomp on the saw and like Jacob said, it really doesn't work good on cold start (I have to press down every pull) but better than not having one. It kicks and locks like no man's business. My stihl dealer did not have one in stock so I'll settle for the second best. j/k

I won't complain as long as it holds together and cuts as good as my other 044 though.

 

[pioneerguy600]

I am real happy that you posted this yo2001 as it is one of the things that I am going to attempt for my next 044 to 046 upgrade. I have sort of maxed out by building and modding 5 of the 044/440`s this year so I figure its time to move on and try more cc`s.
Pioneerguy600 :agree2:

 

[yo2001]

I sure like mine.

Good running saw there. I hope mine would runs half as good as that saw.

 

[Martinm210]

That is pure saw pron...:jawdrop: awesome

 

[TimberMcPherson]

Nice work, its a crime I have my 044 running a chainsaw winch. Keep it up.

 

[yo2001]

Got some video done. I hope this works. The log is 16" yellow pine.

BB kit 8 pin on 16" RSC chain out of box. I clocked low 6 sec.


044 8 pin same B&C clocked at about 7 sec


I got several other videos and found the bb kit about 1 second faster in cut. 7 pin was about .3-.4 sec slower in cut. The bar was buried in the pine which probaly slow down the cut time. (well, seems to me at least)

In my defense, both saws are mildly ported but 044 probably got little bit more work done than my new BB kit with one tank through it.

Enjoy!

 

[timberwolf]

Great thread.

You should have no issues with case volume, there is a slight case volume difference 044 vs. 046 the small case volume helps draw the full charge in at higher RPM, just don't go wild on intake durration or the case will overfill and the charge change direction and blow fuel back out the carb.

I built up a 044/046 and one with BB a while back and they worked quite well, puts a lot of CCs in a small light package.

 

[yo2001]

Thanks TW.

I've not done cut time comparison before but 1 sec in that size log a big gain or small gain? I guess in math it's 14% faster cut time.

 

[Wet1]

Very nice. I wouldn't try comparing the two times at this point if the BB saw has not been broken in yet. I would expect that it will get quicker as you continue to break it in. Again, nice job.