Building the ultimate sleeper saw.... 46cc Craftsman into a ported 72cc

[Eccentric]

I had to stay with the 34mm stroke. The 038 Mag was the largest top end that I had with a 34mm stroke.
I started to do another one with an 036 top end. That uses a 10mm pin, so no bushings are needed. I notched the fins to get the jug to fit. Then I checked the squish and found out it had .070ish. So I quit then. If somebody knows a piston with a taller pin to crown height than an 036, that mod would be even easier. Still need to cut the flywheel though and remove the fins on the transfers.

A Husky 61 has a 34mm stroke and a 48mm bore. Not sure what the crown to pin measurement is....and can't remember the pin diameter right now. You're gonna end up with 61.5cc using an 036 top end. A Poulan 3500 is 60cc (and that top end bolts onto a 2800 Poulan). Not sure if your 036 hybrid is worth the trouble. 72cc sure is though.

Have you looked into using a 268XP or 272XP top end? Again....I can't remember the pin diameter, pin-crown measurement,or rod small end width for that saw series. They also have 34mm stroke measurements........and have 50mm & 52mm bore measurements (respectively). that series (61-thru-272XP) also doesn't use a spigot on the cylinder and a boot........but instead uses a rigid intake manifold. Maybe you could make up your own spigot that bolts to the cylinder...

Model Profile: 61 RANCHER

Model Profile: 036 AVSEQ

Model Profile: 266XP

Model Profile: 272XP

 

[brokenbudget]

10mm 044? i otstir:

 

[Arrowhead]

Wow this project floored me. WTG :msp_thumbup:

Isnt the poulan 32mm stroke though? With a 52mm bore would be 67.98cc 68cc Where the 038 mag uses 34mm stroke for 72.2cc.


Way to think out of the box.

It's 34mm. I measured it and checked info on it.

10mm 044? i otstir:

I thought of that, but the 044 has a 36mm stroke. Can be done, but more work than I wanted.

 

[Arrowhead]

A Husky 61 has a 34mm stroke and a 48mm bore. Not sure what the crown to pin measurement is....and can't remember the pin diameter right now. You're gonna end up with 61.5cc using an 036 top end. A Poulan 3500 is 60cc (and that top end bolts onto a 2800 Poulan). Not sure if your 036 hybrid is worth the trouble. 72cc sure is though.

Have you looked into using a 268XP or 272XP top end? Again....I can't remember the pin diameter, pin-crown measurement,or rod small end width for that saw series. They also have 34mm stroke measurements........and have 50mm & 52mm bore measurements (respectively). that series (61-thru-272XP) also doesn't use a spigot on the cylinder and a boot........but instead uses a rigid intake manifold. Maybe you could make up your own spigot that bolts to the cylinder...

Model Profile: 61 RANCHER

Model Profile: 036 AVSEQ

Model Profile: 266XP

Model Profile: 272XP

A solid intake is in the future for sure. The 044 works OK, but there is a slight offset in it that I don't like.

 

[echoshawn]

can't believe it took me this long to stumble on this thread.... subscribed.. opcorn:

 

[rmh3481]

Great project!

The largest HDA carb is going to have a 16.7mm venturi with a 20.56mm throttle bore and a 22mm choke plate. You can open these up a little. Otherwise your into WJ territory and those carbs have the diagonal mount.

 

[Arrowhead]

What do you builders think of raising the transfers some? They are at 130 now. Exhaust is 100. I was thinking 122ish.

 

[barneyrb]

What do you builders think of raising the transfers some? They are at 130 now. Exhaust is 100. I was thinking 122ish.

Ed, I'm just a dumb country boy but I think I would split that in half, 126 or so, you can always go back in and remove more, can't add it back......

 

[locofrog]

you sir....
are amazing. great vision of projects' end and good follow through. seriously bro you have an amazing saw here and i can't wait for video.

loco

 

[Arrowhead]

Ed, I'm just a dumb country boy but I think I would split that in half, 126 or so, you can always go back in and remove more, can't add it back......

Very true. I usually like 20 degrees of blowdown, figured I give the 30 a try since that's where they were. I think there is a lot more to be had if I get the transfers closer to 120.

 

[Modifiedmark]

ModifiedMark was nice enough to tell me the larger carb that is a direct bolt on. It's an HDA ?? ( I forget). He did tell me that series carb had some issues. I thought I bought an nos older one (before the problems). But I'm thinking not. The low screw is probably 2.5 full turns out. :msp_mellow:
It 4 strokes fine, but something don't seem right with the carb. Maybe Mark will chime in and explain the issues. New carb is on the right.

Ed, I have a HDA 137 here thats the same size that I have been saving for a project. I'll rebuild it and bring it with me or send it to you to try. Thats the earlier version of the HDA 164 that you got.

Seens some 164s were fine and just the later ones had some bad ones pop up from time to time. Kinda like that Husky deal with those Walbros.

 

[RedneckChainsawRepair]

It's 34mm. I measured it and checked info on it.

Just giving you a heads up. The 3000 305 3300 365 330 3750 etc etc are all 32mm stroke in those series of saws. :msp_wink:

Do the math 49mm bore x 32mm stroke 60cc 3750 380 365 3500. 46.5mm bore x 32mm stroke 54cc 330 3300. 44mm bore x 32mm 49cc 3000 305 etc

I dont know what the bore of 2800 2900 is but 32mm stroke x 42.5mm bore 45.4cc or 43mm bore 46.4cc

 

[Modifiedmark]

the clutch/drum assembly from a 3400-3700etc. will also fit.:hmm3grin2orange:

Really, I never thought to look at that!

Would swapping out the starter handle give it away, or doesn't it give any trouble with snatchback?

I know a guy who can hook him up with a handle thats original and a little bigger, and will probably be a good idea.

When they work, they do OK. And somebody seeing a 28"er would know something was up.

They sell the almost same size saw, I suspect with strato or whatever now, with 20" and 3/8's on it new. And it does OK.

I don't think its keeping up with Ed, though.

Probably have to find a old 28" bar in the 276 Mac mount to use on that.

Just giving you a heads up. The 3000 305 3300 365 330 3750 etc etc are all 32mm stroke in those series of saws. :msp_wink:

Do the math 49mm bore x 32mm stroke 60cc 3750 380 365 3500. 46.5mm bore x 32mm stroke 54cc 330 3300. 44mm bore x 32mm 49cc 3000 305 etc

I dont know what the bore of 2800 2900 is but 32mm stroke x 42.5mm bore 45.4cc or 43mm bore 46.4cc

Yeah I think your right, those saws all use the same crank.

 

[Modifiedmark]

all it needs now is some mini dual dogs off an 026/036 :hmm3grin2orange:

Naw, no need, I just need to find another 61 266, 272 etc type dogs and I will fix him up with a set like this.

 

[brokenbudget]

Really, I never thought to look at that!

don't know if the side cover would go on, i know it wouldn't if it had a chainbrake, just had the 2 saws apart one night and......:hmm3grin2orange:

 

[WoodChuck'r]

Possibly the best thread in AS history....???

 

[Arrowhead]

Just giving you a heads up. The 3000 305 3300 365 330 3750 etc etc are all 32mm stroke in those series of saws. :msp_wink:

Do the math 49mm bore x 32mm stroke 60cc 3750 380 365 3500. 46.5mm bore x 32mm stroke 54cc 330 3300. 44mm bore x 32mm 49cc 3000 305 etc

I dont know what the bore of 2800 2900 is but 32mm stroke x 42.5mm bore 45.4cc or 43mm bore 46.4cc

I rechecked my info. You are correct Kevin.
My first thought was a 10mm 044 top with a 36mm stroke. I read too many numbers.... lol.
I now have a 68cc. I have another one of these... I'll find a way to 72+cc though.
My friend was wanting to make a billet crank/rod, I didn't think it was necessary. Now I do. :msp_thumbup:

 

[Modifiedmark]

I rechecked my info. You are correct Kevin.
My first thought was a 10mm 044 top with a 36mm stroke. I read too many numbers.... lol.
I now have a 68cc. I have another one of these... I'll find a way to 72+cc though.
My friend was wanting to make a billet crank/rod, I didn't think it was necessary. Now I do. :msp_thumbup:

Hey, you still got a 22cc increase! Not to freaking shabby!

 

[barneyrb]

Hey, you still got a 22cc increase! Not to freaking shabby!

The best part is 22cc bump AND closed ports............

 

[Dan_IN_MN]

Possibly the best thread in AS history....???

I guess you'd know, coming from a person who's been around sense 2001!