Drive sprocket size VS torque?

[SRT-Tech]

question:

will a larger chain drive sprocket slow the chain down, creating more torque? or is it a smaller drive sprocket that will create a slower chain and more torque?

{Keep in mind i'm used to gearing trucks and bikes, not chainsaws... }

 

[Justsaws]

Larger chain spocket will increase speed and decrease torque.

 

[SawTroll]

Larger chain spocket will increase speed and decrease torque.

Yes (effective torque, that is), and as a result of this, it will easier pull the saw out of its useful power band.

In very small wood this isn't an issue - chain speed (+ type and sharpness of course) is what counts.

The difference between 7-pin and 8-pin is about 13%, I believe.

 

[SRT-Tech]

thanks! i had a hunch a larger sprocket would ramp up the speed

now will that faster speed cut faster? (chain teeth biting faster?)

 

[SawTroll]

As I tried to say, it depends on a lot of factors, the saw, the chain, the wood type and size beeing some important ones.

Sprocket rims are cheap, so just try......

 

[computeruser]

thanks! i had a hunch a larger sprocket would ramp up the speed

now will that faster speed cut faster? (chain teeth biting faster?)

Yes it will, with the caveat that the saw must be able to pull the chain through the wood at the new, higher speed without getting out of its powerband. This is where bar length, chain type and wood type come into play. You should read the Madsens Sprocket Tuning Article if you haven't already.

 

[SRT-Tech]

hey thats was a great link, explained a LOT!.

keeping my saw stock.