Spuds Porting and Tuning Thread

[jnoon]

No worries, a pleasure to help and hope you get the bearing sorted soon:thumbup:

 

 

Spud,I've got some Fuchs silkolene mx oil to use up, is it best to stick to the hp super for the ported saw and use it up on the rest, used it before with no probs just wanted to check with you, it's a synthetic oil btw

[spudulike]

Spud,I've got some Fuchs silkolene mx oil to use up, is it best to stick to the hp super for the ported saw and use it up on the rest, used it before with no probs just wanted to check with you, it's a synthetic oil btw

 

TBH, I have always used Stihl HP at 45:1 - my own choice and never had any issues but it has to be said, I don't do pro cutting - most is hauling firewood out of local ditches:thumbup:

 

Any decent Stihl/Husqvarna etc oil will be fine, just make sure the mix is fresh and mixed right!

[wyk]

The only caveat with SIlkolene is to make sure it is synthetic esther and not castor or kart or racing oil. Avoid castor in a chainsaw unless you tear it down often.

[jnoon]

The only caveat with SIlkolene is to make sure it is synthetic esther and not castor or kart or racing oil. Avoid castor in a chainsaw unless you tear it down often.

 

 

Hi Wyk,

Yes it is synthetic ester, low ash , low smoke, high protection , so will it be ok?

I was told by someone a few years ago that decent mx oil is a very good quality oil to use in the saws,

Josh

 

[wyk]

Hi Wyk,

Yes it is synthetic ester, low ash , low smoke, high protection , so will it be ok?

I was told by someone a few years ago that decent mx oil is a very good quality oil to use in the saws,

Josh

 

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Says JASO FD on the back there, so prolly good stuff. It claims to be tank premix compatible, so should work fine. I can't say much more as I haven't used it myself, but others on some forums have said it works for them. Follow standard chainsaw mix ratios and you should be alright. I run all mine at 40:1.

[treewizard]

Gonna port my 038 as i hardly use it at the mo

[spudulike]

Gonna port my 038 as i hardly use it at the mo

 

Not done one before, if you are new to porting, watch the piston skirt size and port accordingly plus watch the ring ends - easy to get carried away or make non reversible errors.

[Dinosaw]

038 is funny as it has the piston ring stop pins on either side of the exhaust port plus the piston skirts aren't very wide. May not be much room to do any widening.

[wyk]

038 is funny as it has the piston ring stop pins on either side of the exhaust port plus the piston skirts aren't very wide. May not be much room to do any widening.

 

Modding the timing gives similar results to adding width. The only problem is you do so on a 38 at the sacrifice of possible torque if you open the exhaust earlier, and you lose some intake velocity adding timing there instead of width, which again is lost midrange torque. Having said that, just adding some intake timing and exhaust alone, with a decent muffler mod, and you will see a big difference throughout the entire power band.

[spudulike]

038 is funny as it has the piston ring stop pins on either side of the exhaust port plus the piston skirts aren't very wide. May not be much room to do any widening.

 

Been there with the MS441, damn easy to widen ports without thinking about what will happen to the ring ends - hope treewizard is taking note of the advice!

 

BTW - I hate having ring ends in this sort of position!