What's on your bench today?

[Rich2484]

I was talking about ported saws today.

 

Is there a reason only husky can be ported? Why not stihl?

[Peter]

Lots of ported Stihl saws around, a quick YouTube search will bring up plenty.

[spudulike]

I was talking about ported saws today.

 

Is there a reason only husky can be ported? Why not stihl?

 

None at all, there are limiting factors on all saws including transfer design, piston type and where the ring ends are on the piston.

 

One of the great things about the 346 and 357 is the fact the piston has a complete solid skirt so the inlet and outlet ports can be opened up nice and wide and probably gives the largest difference plus the standard squish is around 1mm so can be lowered by 0.5mm giving another 15psi and more torque very quickly.

 

Other saws give very little - the MS200T inlet width can hardly be changed - if you do, you are highly likely to snag the ring ends!

 

 

It is all a compromise, you chip away at the bits that you can do and work within the constraints of the cylinder design!

 

Oh - we talk about Husky because I wanted to take one of the fastest machines in its class and make it faster - the 346XP - I then followed it up with a right off 357XP I had kicking around - now feels like new and is a little lively!

Edited October 17, 2012 by spudulike

[Rich2484]

Ok. Just using the 034 on pine this week and it was a bit sluggish lacked a certain kick. Would love to use it ported and see what difference it would make.

 

Might have to ask Santa what he can bring me.

[Chris Sheppard]

Can open ported saws be ported or would the effort outweigh the benefits?

 

At the other end of the scale, I'd really like to find myself in a position where I could send you a 242 for porting - it'd be interesting to see how much more revvy it could be made

[spudulike]

Can open ported saws be ported or would the effort outweigh the benefits?

 

At the other end of the scale, I'd really like to find myself in a position where I could send you a 242 for porting - it'd be interesting to see how much more revvy it could be made

 

By open ported I guess you mean the transfer ports and not the side skirt window ports in some pistons.

 

yes, you can portopen transfer port engines - you can open up the inlet and exhaust ports, not a lot to be done with the transfers.

 

I avoid clam shell engines as they are a PITA to take apart and squish is neigh on impossible to change!

 

Measured the 357XP the other day and it is running at around 14,900rpm and the spark plug is a nice tan colour!

[spudulike]

Started work on the raft of MS200Ts that landed yesterday, the one called Carl needed a carb clean which I did in the ultrasonic bath, did a couple of other checks, refitted and it dialed right in - nice:thumbup:

 

The one called Joe was less than perfect, the exhaust was loose in the saw and the bolt had broken off. Tried drilling and an easy out but it was tight....very tight and feared the easy out would snap - being hardened, I wouldn't be able to tap it out so just drilled it out and re-tapped the hole, not pretty but a solid repair.

 

The carb was pretty shot despite a thorough clean, I couldn't get the thing ideling so sorted out the accelerator pump and the saw now idles and revs out fine - just needs a tach. The side cover also needed a bit of patching.

 

Now working on "Ben" - looks in better shape than Joe:001_rolleyes::lol:

 

Oh - had to break off halfway through fixing "Joe", had a cry of help from Matty F working in a garden behind mine - had a chain snap and needed a new one - got one sorted and got back to work.

[MattyF]

Cheers bud I owe you one.. Glad I didn't have to top a thuja hedge with a 372!

[spudulike]

Cheers bud I owe you one.. Glad I didn't have to top a thuja hedge with a 372!

 

Thought I was going to have to pull the chain off the 009 Stihl for one minute, lucky I have one to hand!

 

Just pulled the exhaust off the MS200T called "Ben", Bad news, the piston is heavily scored despite the saw pulling over 150psi, lucky I pulled in a couple of pistons prior to this lot coming in, reckoned on one or two being fooked.....thats life.

 

Need to clean the bore and get it fitted - will fit one of my super thin gaskets - that will get the saw going a bit:thumbup:

[spudulike]

Here is the result of last Sundays 357XP refurb: -