All things Hybrid

[thedude74]

Mounting holes side to side I.D.

 

[hacskaroly]

Carb still mounted for orientation reference.

Thanks!! With all that gunk on there, it makes it look like the carb/cylinder is all one piece...lol

 

[Ketchup]

Generally any 34mm stroke cylinders on a 32mm stroke frame?
Did I read about Husqvarna 55 with 61 top?

I put a 357 jug (34mm stroke) on an Echo 490 (33mm stroke). It could potentially be crammed on a 346xp or similar. Depends on rod length and deck height.

 

[thedude74]

Thanks!! With all that gunk on there, it makes it look like the carb/cylinder is all on piece...lol

No worries brother. Let me know if you need anymore dimensions. Haha yeah it's filthy for sure.

 

[thedude74]

Woodslasher's 056/066 hybrid build

Woodslasher's 056/066 hybrid build

Since I couldn't find a good how-to thread on how to put an 056 Mag II piston/cylinder on an 066 chassis, I decided I might as well write up how I'm doing it. Be forewarned, this thread will move along at the same pace that the saw is, so there might be large gaps between posts. Also, the 066 I...

opeforum.com

 

[Ketchup]

Some important crumbs in here. @Shane¹

084 rod specs and other stuff?

For those that have played, what are the dimensions of the 084 rod? Length, big end diameter, width. I’m having some ideas. Has anyone heard of other cranks besides the 3120 that people used it on?

opeforum.com

 

[Ketchup]

Husky 288/395 Hybrid Build

I know what some of ya are probably thinking. It would be easier to just bore out the existing cylinder to 56mm and re plate it. BUT, I like doing things the hard way. There is a spare 394 top end down in my barn I can get measurements off of.

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[thedude74]

Husky 288/395 Hybrid Build

I know what some of ya are probably thinking. It would be easier to just bore out the existing cylinder to 56mm and re plate it. BUT, I like doing things the hard way. There is a spare 394 top end down in my barn I can get measurements off of.

opeforum.com

Looks like it kinda petered out. Scarrs idea of the 2100 crank is interesting. Topped with a 395 big bore that's a 105.6 cc 288xp. These hybrids, strokers and hybrid/strokers intrigue me.

 

[davidwyby]

Looks like it kinda petered out. Scarrs idea of the 2100 crank is interesting. Topped with a 395 big bore that's a 105.6 cc 288xp. These hybrids, strokers and hybrid/strokers intrigue me.

I’m gonna give it a look once some parts get here

 

[Ketchup]

Looks like it kinda petered out. Scarrs idea of the 2100 crank is interesting. Topped with a 395 big bore that's a 105.6 cc 288xp. These hybrids, strokers and hybrid/strokers intrigue me.

Word around the log pile is that 2100 cranks are prone to big end failure.

Deets’s 43mm stroke 090 idea is pretty cool.

 

[davidwyby]

288/395…so husky can keep up with a 661

 

[thedude74]

Word around the log pile is that 2100 cranks are prone to big end failure.

Deets’s 43mm stroke 090 idea is pretty cool.

I hadn't heard this before. Just got a new 2100 P&C for the 285.

288/395…so husky can keep up with a 661

My neighbor just seized his bosses 661....Even a Husky rancher can whoop it now.

 

[thedude74]

I’ve got a few photos but I didn’t do a very good job documenting so far. Plenty more to do. If it doesn’t crater I’ll try to do a writeup.

Any further developments on the 361 stroker hybrid? At one point someone on eBay was selling a crank bearing(or seal?) bushing for the 440 crank swap.

While I had a Echo 4910 apart I got a 49mm 361 big bore cylinder out and stared at them for a few minutes. If not mistaken the both have an 11mm piston pin. But to be honest I never checked since the 361 is side fed .....echo is bottom fed and mounting flange is a mile off.

 

[Ketchup]

Any further developments on the 361 stroker hybrid? At one point someone on eBay was selling a crank bearing(or seal?) bushing for the 440 crank swap.

While I had a Echo 4910 apart I got a 49mm 361 big bore cylinder out and stared at them for a few minutes. If not mistaken the both have an 11mm piston pin. But to be honest I never checked since the 361 is side fed .....echo is bottom fed and mounting flange is a mile off.

Stihl 361 Junkyard Zombie Mutant

“Runs good.”

opeforum.com

I looked hard at 361 on a 4910. Unfortunately the base pattern is way off. IIRC the deck height is a problem as well. 357/359 can be squeezed in, 365special might even fit with enough effort. There are several other side fed cylinders that might work as well. When you’re down-stroking like that you want a jug off a saw with a high deck. You need to drop the jug, so adding a base plate isn’t practical. Luckily 4910 is 33mm stroke, so you only have 1mm to compensate for.

 

[Ketchup]

This needs to be here.

HELP! - Big cylinder bolt spacing measurements

Anyone have any of the big cylinders laying around for some bolt spacing measurements I am planning a potential hybrid mission but need some info on where to start on a cylinder. I am thinking if anyone has 084, 088, 3120, or even an 066 or 395 cylinder laying around those would be my first...

opeforum.com

 

[srcarr52]

Word around the log pile is that 2100 cranks are prone to big end failure.

Only when you put too much ignition timing to them. The longer dwell time due to the longer rod make it finicky on ignition timing.

 

[thedude74]

Stihl 361 Junkyard Zombie Mutant

“Runs good.”

opeforum.com

I looked hard at 361 on a 4910. Unfortunately the base pattern is way off. IIRC the deck height is a problem as well. 357/359 can be squeezed in, 365special might even fit with enough effort. There are several other side fed cylinders that might work as well. When you’re down-stroking like that you want a jug off a saw with a high deck. You need to drop the jug, so adding a base plate isn’t practical. Luckily 4910 is 33mm stroke, so you only have 1mm to compensate for.

What did you think of that 4910/357 hybrid? Was it stronger than a ported 4910?

The 365, if possible looks like excellent candidate. Bottom fed 48mm closed quad netting 59.72cc

 

[thedude74]

Caleb's @Ketchup MS361 hybrid monstrosity.

Stihl 361 Junkyard Zombie Mutant

“Runs good.”

opeforum.com

 

[Ketchup]

What did you think of that 4910/357 hybrid? Was it stronger than a ported 4910?

The 365, if possible looks like excellent candidate. Bottom fed 48mm closed quad netting 59.72cc

The hybrid is much stronger than my ported 4910. There are difficulties with the transfer flares on the 365S. A husky 268 may be a better fit.

 

[Wood Doctor]

Anybody got a 550 to 562 conversion thread? Considering having a try.

Not sure I could recommend that because the 550 XP already has been criticized for running a bit too warm. The carb is mounted too close to the cylinder and that sets up vapor lock that then leads to hot start troubles. Upgrading that engine to the 562 might make it worse. Just MHO.

Now, of course, you could argue that a larger cc engine might allow it to run cooler and solve some overheating problems. Always a possibility, but both the bore and the stroke are larger on the 562, so it won't be easy.