Saw video thread

[junkman]

Jason is right .

 

[jmssaws]

How can so many models share the same crank?

 

[jmssaws]

Jason is right .

I know for a absolute fact that it doesn't matter.

I've said it 10 times,how come loading the saw more doesn't mess up balance?

The piston is no different than the chain

 

[X 66 stang347 X]

I can see where your coming from. And the compression stroke is also a fighting force against the crank lobes. I've wondered how the big bore kits on atv's didn't vibrate. My yfz450 had almost 100cc's over stock And seen no adverse effects

 

[junkman]

I know for a absolute fact that it doesn't matter.

I've said it 10 times,how come loading the saw more doesn't mess up balance?

The piston is no different than the chain

If it did matter i would not be able to bolt any top end on a 250r from 250 to 370cc without messing up balance .

 

[Chainsaw Jim]

Why do people try to compare two completely different types of engine and then argue so hard?
Yes the two stroke crank counters are balanced but not nearly to the precision necessary for a multi cylinder design.

 

[94BULLITT]

I never got the whole single cylinder balance thing figured out but I think it just clicked.

On a engine with multiple cylinders lets say a 2 cylinder it needs balanced because when on piston is going up the other is goin down. If they were not balanced you would have a vibration. You need to forget all this on a single cylinder.

The piston does not need balanced to the rotating assembly because there is only one piston. A single cylinder can be balanced but they can only be balanced for a certain RPM. The flywheel has a counterweight to balance the crankshaft and that is all you need on a single cylinder.

Sent from my SPH-L710 using Tapatalk

 

[X 66 stang347 X]

I dont think there was any arguing Just a friendly debate. Physics was never my strong point

 

[Chainsaw Jim]

Well, argue/debate, I suppose it's all necessary or chit would never get figured out.
I guess I was nagging more about the higher levels of passion which tends to foul the air.

I still learned a few things regardless.
Also just learned you can say ass but not *b-word on here. Lol

 

[Deets066]

Where can I send my hybrid to, to get my piston balanced??

 

[GCJenks204]

I tried to run saws today but they all ran like *s-word at 15 degrees outside.
Maybe tomorrow

Every time I was cutting with my MMWS044 this fall the temp was colder and a real *b-word to keep in tune. I am thinking that AT/MT will be a good solution so a MMWS562XP is my next saw and probably a 550XP or some version soon to follow.

 

[jmssaws]

I ran a couple today.

 

[trooney]

where's the 084??

 

[MustangMike]

If a single piston engine does not need to be balanced (at all), the earth is flat.

The reason you can swap pistons, etc, is cause they are over built, and the piston is very light compared to the rod and counter balancers.

An opposing cylinder engine may be able to use the rods & pistons on one side to balance the rods and pistons on the other side, but all in line and V engines need balancers on the crank, and that is why all those engines have them.

Just look at it, WHY ARE THE COUNTER BALANCERS ON THE CRANK ALWAYS OPPOSITE THE ROD & PISTON!

Enough said, I'm done beating a dead horse. Believe what you wish.

 

[MustangMike]

It would be more obvious if the rod were 180 degrees the other way, but you can clearly see that the counter balances are on the opposite side of the crank than the rod journal. And yes, I did replace that little 029 piston with that large 390 piston, and it ran and is still together.

 

[jmssaws]

Nobody is saying that there not balanced because they are.
I'm saying the piston has nothing to do with it because it doesn't.

 

[jmssaws]

It would be more obvious if the rod were 180 degrees the other way, but you can clearly see that the counter balances are on the opposite side of the crank than the rod journal. And yes, I did replace that little 029 piston with that large 390 piston, and it ran and is still together.

The weights on the crank are to balance the rod journal so you have a stroke.

I've built a lot of alcohol burning 250r cr250 motors that were stroked and bored to the max,they were extremely high rpm and horse power and every thing was done that could be done to keep them together as long as possible.

Never one time did the word balance come up.

 

[jmssaws]

where's the 084??

Holding a table down and doing a fantastic job of it.

Gonna try to get it ported this week

 

[junkman]

Can we talk about counter balancer's ? Take those out of where they were and have a shakin sob .

 

[MustangMike]

The weights on the crank are to balance the rod journal so you have a stroke.

I've built a lot of alcohol burning 250r cr250 motors that were stroked and bored to the max,they were extremely high rpm and horse power and every thing was done that could be done to keep them together as long as possible.

Never one time did the word balance come up.

Then why is it so critical with auto engines that only rev 1/2 the RPMs?

I'll answer that, cause the parts are bigger and not so over built.