Spuds Porting and Tuning Thread

[MattyF]

Sticker groms all of you ! .... can I have some Steve ?

[Youngstu]

Hi Spud

I'm just wondering if it's worth doing anything to improve the power of a Stihl 029. I have a small saw and a big one for milling with and could do with the middle sized one having more power to get through bigger logs quicker and easier, without forking out on a new saw. I understand it's not a high spec saw, but got it from my old man and free is good!

Thanks

Stuart

[Tom D]

Spud did an 034 for us, it was good......

[spudulike]

Bugger. Thought I was special

 

You're special Joe.....think they have institutions for special ones like you:001_tt2:

[spudulike]

Sticker groms all of you ! .... can I have some Steve ?

 

Of course Matt, when you send the next one down:thumbup: Just don't complain about the compression:001_rolleyes:

[spudulike]

Hi Spud

I'm just wondering if it's worth doing anything to improve the power of a Stihl 029. I have a small saw and a big one for milling with and could do with the middle sized one having more power to get through bigger logs quicker and easier, without forking out on a new saw. I understand it's not a high spec saw, but got it from my old man and free is good!

Thanks

Stuart

 

029s are clam engines and are therefore not the easiest machine to do too much with. Probably a muffler mod would be the simplest way forward on one of these saws unless it is coming apart for another reason.

[spudulike]

Spud did an 034 for us, it was good......

 

Interesting that the 254XP is the best, it seemed pretty wild after it was done, sort of Lada to Lamborghini in 8 hrs:thumbup:

[spudulike]

Been a bit quiet on the forum lately....are we all that jaded after Christmas:001_rolleyes:

 

I have had a MS461 in for porting, strange saw with a lot of contradictions inside it. The transfers are on the front of the cylinder, same as the 560XP. The piston is strangely windowed, strangely as there are no cylinder wall lower transfers as the uppers are fed from the front as previously mentioned.

 

The strangest part is a lump of casting bolted to the crankcase opening that pushes in to the piston cavity when the piston is on it's downward stroke. I am guessing that this acts as both a stuffer increasing transfer volume and also a guide to direct the flow toward the lower transfers. There are also some side cut-outs in the crankcase opening and am thinking that these and the piston windows act to increasing the flow in to the transfers.

 

Anyway - the muffler mod was relatively simple, the inlet and exhaust ports were reshaped as there is little widening you can get away with. Ring ends are also an issue being both forward and rear facing. The flywheel key was modified to give around 5 deg ignition advance!

[Gerbutt]

Have you done a 460 before? Good gains?

 

 

Sent from my iPhone using Arbtalk

[spudulike]

Have you done a 460 before? Good gains?

 

 

Sent from my iPhone using Arbtalk

 

I have done a couple of MS460s and MS440s, DaytheTrees is using one and believe he is happy with it. One of those saws where you do lots of smaller bits that give you decent gains. PM him if you want a review:thumbup: