One ring vs two

[Deets066]

lighter is always better

Is that part of the reason you cut the dome off an 026?

 

[Deets066]

It would also change the balance factor of the crank, which may hinder or help.

I thought that sort of balance was only relevant in an engine with multiple cylinders?

 

[czar800]

I thought that sort of balance was only relevant in an engine with multiple cylinders?

I was thinking the same thing.

 

[bwalker]

I thought that sort of balance was only relevant in an engine with multiple cylinders?

A single cylinder engine can never be perfectly balanced accross ita wntire rpm range. So typically the balance factor is tuned such that the engine is balanced in the rpm range it mostly runs at. Adding or removing weight changes this rpm.

 

[jmssaws]

Balanced is balanced regardless of rpm.

 

[Deets066]

A single cylinder engine can never be perfectly balanced accross ita wntire rpm range. So typically the balance factor is tuned such that the engine is balanced in the rpm range it mostly runs at. Adding or removing weight changes this rpm.

Would harmonics be a better term for what you are referring to? There again I've only related that to multiple cylinder engines

 

[bwalker]

Balanced is balanced regardless of rpm.

Its not possible to completely balance
a single cylinder engine across the entire rpm range.

 

[Deets066]

lighter is always better

So let's say your goin to use a 288 piston in an 066 would you lighten it up ?

 

[Mastermind]

Y'all seen this yet?

http://opeforum.com/threads/raffle-for-fellow-ope-member-hoskvarna.801/#post-36346

 

[jmssaws]

So let's say your goin to use a 288 piston in an 066 would you lighten it up ?

A crankshaft is balanced and stays balanced regardless of the load on it.
If the piston is a pound or a ounce it's still balanced.

 

[Deets066]

A crankshaft is balanced and stays balanced regardless of the load on it.
If the piston is a pound or a ounce it's still balanced.

I agree, there isn't a way to unbalance a single cylinder engine

 

[awol]

Balanced is balanced regardless of rpm.

This is true for a rotating mass; when you add the reciprocating mass of a piston however, it is possible to achieve perfect balance at only a certain speed.

 

[Mastermind]

Who here has had the pleasure to use a twin cylinder Echo?

 

[Deets066]

This true for a rotating mass; when you add the reciprocating mass of a piston however, it is possible to achieve perfect balance at only a certain speed.

How would one know when this "perfect balance" is achieved?

 

[jmssaws]

How would one know when this "perfect balance" is achieved?

Who knows. Lol

 

[jmssaws]

Who here has had the pleasure to use a twin cylinder Echo?

Never have, vibrate?

 

[awol]

Who here has had the pleasure to use a twin cylinder Echo?

I have. And Mccullochs bp1 also. Amazingly smooth aren't they?

How would one know when this "perfect balance" is achieved?

On a saw with no anti vibe it can be easily felt.

 

[Mastermind]

Smooth as glass. In the Echo......the opposing pistons cancel out vibration.

 

[paragonbuilder]

I have. And Mccullochs bp1 also. Amazingly smooth aren't they?


On a saw with no anti vibe it can be easily felt.

It's like an unbalanced rim on your car. It vibrates like hell! But then there is always that one speed, never the one you want, where its smooth as glass.


Sent from my iPhone using Tapatalk

 

[bwalker]

Would harmonics be a better term for what you are referring to? There again I've only related that to multiple cylinder engines

No.