All things Hybrid

[Red97]

It is one of those things that is jug dependant.

Tall piston would be high in the exhaust port at bdc. Depending on skirt length you may not be able to power exhaust. At bdc it may cover the transfers too.

Could still run but it may be better to use a shorter/lighter piston and do extra machine work.

Darn hybrids.

 

[Ketchup]

It is one of those things that is jug dependant.

Tall piston would be high in the exhaust port at bdc. Depending on skirt length you may not be able to power exhaust. At bdc it may cover the transfers too.

Could still run but it may be better to use a shorter/lighter piston and do extra machine work.

Darn hybrids.

That’s about what I thought. Taller piston will help with squish but hurt port area. Dropping the jug will make that worse. 1mm is 0.040”. At first that didn’t seem like a lot but the more I consider…

I think I need to put some parts together and see what I get. 52mm is a nice size. Lots of jugs and pistons to choose from.

 

[Red97]

That’s about what I thought. Taller piston will help with squish but hurt port area. Dropping the jug will make that worse. 1mm is 0.040”. At first that didn’t seem like a lot but the more I consider…

I think I need to put some parts together and see what I get. 52mm is a nice size. Lots of jugs and pistons to choose from.

359 272 stuff

 

[farminkarman]

View attachment 322894

359 272 stuff

Alright, so is that a 359 jug with a 272 gasket showing how much you gotta stretch the holes on the 272 jug?

 

[Ketchup]

Very cool gents.

https://opeforum.com/threads/poulan-hybrids.27979/

 

[Shane¹]

Here is some pics of my dolmar 123 and husky 2100 hybrid. The cylinder plating is not great and crank has some play but going to run it until it explodes then I will build another one with a fresh cylinder from the duke. It is an absolute animal really good combo I have no idea what timing numbers are but maybe I will check it someday and see how it looks

 

[Ketchup]

I’m going to add this thread to the mix. It’s a good read on stroke and rod length. I think previously I have overlooked the importance of rod length.

Short stroke v's long stroke saws

Hey folks. I am wondering what peoples opinions are on stroke length to bore diameter in a saw when it comes to performance. The older 0X8 series saws generally had a larger bore diameter and shorter stroke than the 0X4 and 0X6 series saws. I don't see many people porting and hotting up 028's...

opeforum.com

 

[Paul Fithian]

Stihl West German O24 AV Restore / Upgrade to Ported 44mm

Had a bit of fun, learned new things, and got to know some wonderful folks upgrading my vintage 024 AVS in this thread: https://opeforum.com/threads/stihl-west-german-o24-avs-upgrade-to-44-7-bore.27703/ Decided to have another go at it to build a 16" saw with some leftovers from that upgrade...

opeforum.com

 

[srcarr52]

Does the 2100 crank in a 395 count as a hybrid?

Big bore and stroked Husky 395 build.

I thought of this project in May of 2014 when building a lot of 394's. I had bought an NWP 395BB top end to go on a 395 builder carcass and thought why not make it a stroker too. So I bought a 2100 crankshaft and started to look at what machining needed to be done. Flywheel side of crank needs...

opeforum.com

 

[president]

I know they’re impractical, slow to build and prone to failure but I love hybrid saws. So I wanted to create a place where we could compile info and get dorky on mutant saws. Please post up links to builds! Here’s some links to the more common builds:

https://opeforum.com/threads/husqvarna-357xp-hybrid-build.2176/

https://www.arboristsite.com/community/threads/mastermind-meets-the-stihl-ms440-460-hybrid.198378/


https://opeforum.com/threads/hybrid-time.14922/


https://opeforum.com/threads/stihl-...on-a-460-or-better-using-it-on-a-hybrid.6129/


https://opeforum.com/threads/calling-stihl-hybrid-builders.9593/page-4


https://opeforum.com/threads/dds-064-hybrid-2.2391/page-3


https://opeforum.com/threads/porting-a-064-hybrid.1144/


https://opeforum.com/threads/stihl-064-066-288-saw-build.2813/


https://opeforum.com/threads/064-056-mag11-build.3477/


https://opeforum.com/threads/372-385-390-hybrid-is-it-possible-been-done.17302/


https://www.arboristsite.com/community/threads/372-385-hybrid.286369/page-3


https://opeforum.com/threads/building-a-stihl-024avs-026-hybrid.5953/


https://opeforum.com/threads/stihl-029-super-to-039-conversion.5207/page-4


https://opeforum.com/threads/066-394-hybrid-build.3558/


https://opeforum.com/threads/61-272-hybrid-build.16370/


https://www.arboristsite.com/community/threads/stihl-037-custom-hybrid-build-pic-heavy.154799/


https://www.arboristsite.com/community/threads/husqvarna-350-351-to-346xp-conversion.230298/


https://www.arboristsite.com/community/threads/porting-advice-husqvarna-181-288-hybrid.337395/


Throw some more on here! The list lacks for Dolmar, Echo amd Mac. Discussion is very welcome. Mad scientists unite!

 

[president]

Does the 2100 crank in a 395 count as a hybrid?

Big bore and stroked Husky 395 build.

I thought of this project in May of 2014 when building a lot of 394's. I had bought an NWP 395BB top end to go on a 395 builder carcass and thought why not make it a stroker too. So I bought a 2100 crankshaft and started to look at what machining needed to be done. Flywheel side of crank needs...

opeforum.com

thanks for your efforts here,I will be keen to follow !

 

[Ketchup]

I want to try this one.

361 stroker hybrid

Hello all im Phil from New Zealand, this is my first post, I have a MS361 with 440 crank and 460 cylinder. Used a 440 carb,272 piston ,ms360 flywheel and modded 361 muffler ,all running good with original covers. Cylinder holes required a lot of slotting to fit the different bolt pattern and...

opeforum.com

Edit: And this one is so similar they should go together.

034/044 Stroker hybrid

Few weeks ago I ran across a 036/044 hybrid build using just the cylinder seemed interesting but alot of work. I did like the idea alot though. Long story short I found a 034av with plenty of good parts came with a 034 super I bought. Plan was to sell the super and build the other. I have 044...

opeforum.com

 

[Ketchup]

Tossing this one in for information. Not a complete build, but some helpful specs in there.

A Solo 667 Build thread

Ok fellas, I'm starting this build thread because I'll probably need some input from the group along the way. I haven't done much of this before and I'm diving into the deep end with this one. The saw is a Solo 667. These have a 38mm stroke and a 42mm bore. It has a windowed piston with a 12mm...

opeforum.com

 

[Shane¹]

There has only been 2 that I have seen. Why not put a bigger cylinder on a dolmar 9000? They got the stroke and it's a big saw what do people think how about an 084 cylinder or even 066? @srcarr52 @spencerpaving

 

[Ketchup]

@Shane¹, it’s an exciting idea with a lot of potential. You will need to find a jug with similar base dimensions. Then deck height/rod length will determine as much as stroke. 070, 2100 and even 395 have potential depending on what you find.

As a caution, I started messing with a saw of that vintage and stopped before I got too far. It was just such a nice old saw, I couldn’t bring myself to hack it up.

 

[srcarr52]

There has only been 2 that I have seen. Why not put a bigger cylinder on a dolmar 9000? They got the stroke and it's a big saw what do people think how about an 084 cylinder or even 066? @srcarr52 @spencerpaving

I put a 395 BB (58mm) cylinder on one I did, I had to shave 0.100" off the deck or the cylinder flange would have been too thin.

@spencerpaving put an 084 (60mm) cylinder on his and had to weld the deck to make it fit.

It's also hard to fit much under the plastics, I had to trim the 395 fins quite a bit.

 

[Wilhelm]

Isn't there a 9k hybrid named DolKiVarna or something like that?

 

[Ketchup]

A dolmar 9010 named Darla......(big bore)

So a few months ago steve at the cutting edge sent me a almost new dolmar 9010 for me too play with...he said i could do whatever i wanted with her. I was gonna just give a port job and send it too work.but when i pulled her top off and discovered she had a 42mm stroke it made me think....i know...

opeforum.com

 

[Shane¹]

I put a 395 BB (58mm) cylinder on one I did, I had to shave 0.100" off the deck or the cylinder flange would have been too thin.

@spencerpaving put an 084 (60mm) cylinder on his and had to weld the deck to make it fit.

It's also hard to fit much under the plastics, I had to trim the 395 fins quite a bit.

What about 084 with a 3120 piston maybe the height of the piston is different?
If somebody would buy this saw I would not do crazy stuff lol

 

[Ketchup]

What about 084 with a 3120 piston maybe the height of the piston is different?
If somebody would buy this saw I would not do crazy stuff lol

No doubt I want to. Of course, that doesn’t necessarily protect it from craziness.