Switch from 3/8 LP to 3/8

[Dan Maynard]

Why would you need to change the sprocket? the pitch is the pitch.

3/8LP rim is slightly different to 3/8, if you hold the two against each other the LP is bigger by a mm or two.

I believe the pitch in a straight line may be the same, which is effectively along the rivets. I think the LP drum is a little bit bigger to push the rivets out to the same radius, so that each link is still 1/7 of a circle.

[Wonky]

The pitch maybe the same (it is 😉)  but std 3/8 is just bigger all round than the lopro 3/8 

also the gauge of the drive links is thicker on a std 3/8 it is  1.6mm  where as the lopro is 1.3mm 

 

so taking that into acount you may think you could run a lopro chain 1.3 mm dl in a std 3/8 sprocket. But not the other way round due to the dl gauge.

 

well you could but it would result in breaking tie straps, due to the drive links being sloppy in the drive sprocket.  And I don’t mean the 1.3 to 1.6mm difference. The std 3/8 sprocket slots are bigger for the bigger  dl 

 

 just think of it as wearing ya dads pants, and having to do a cross country run and then those sacks of yours slopping around in those big pants 😂

 

who was it on here a yr ago or more milling with the 660 and a std 3/8 sprocket and a lopro chain and had all the chain breaks.

took some time to figure it all out though.

[Ratman]

Think westphalian had this issue a few years ago on his 660 or 661, RobD sorted him out with full lo pro set up if i remember rightly

 

[adw]

So who does a large splined 3/8 rim with a narrower gauge? and why? certainly a new one on me.

[Dan Maynard]

Personally I think the gauge is a red herring, it's the different diameter that's key. Mine came from RobD of course but it's also a Stihl part.

Rim Sprocket 3/8'' Picco 7T for Stihl MS250, MS250C - 0000 642 1240 | L&S Engineers

WWW.LSENGINEERS.CO.UK

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Rim sprocket 3/8'' Picco 7TGenuine Stihl PartOEM Part No. 0000 642 1240Suitable for the following Stihl Machines:MS 250, MS 250 C, MS 260, MS 260 C, 024, MS 241 C, MS 231, MS 231 C, MS 251, MS 251 C, MS 211, MS 211 C, 021, 023, 025, MS 230

[Rough Hewn]

Just get the right bits.
Mis matched sprockets are like worn sprockets. Bad for bars and chains.

[gonger]

Guys, just wanted to know if someone had tested the diffrence between 3/8 and 3/8LP in fuel consumption and cutting time?

[Rough Hewn]

The cutting speed when milling is almost irrelevant.
Moving slabs is the slow bit.
[emoji106]

[Stubby]

43 minutes ago, gonger said:

Guys, just wanted to know if someone had tested the diffrence between 3/8 and 3/8LP in fuel consumption and cutting time?

I know , I know but you have to have a bit of a row about something else first . Its in the rules . 

[gonger]

47 minutes ago, Rough Hewn said:

The cutting speed when milling is almost irrelevant.
Moving slabs is the slow bit.

I dont have that of a big problem with that. It is also the sharpening and chainging time of the chains. And no i am not getting a 881, because my Cannon Super Bar is in D009. 

 

Just not sure if i will get a 3/8 107cm Bar if i should do skip chains or not?