Jump to content

Log in or register to remove this advert

Fantasy to reality, hot saws... Spud? and others


David Dobedoe
 Share

Recommended Posts

These days when I do mod a saw, I tend to try and go more conservative than hot. I have an 044 that has had nothing but a dual port muffler added and some timing adjustment, and I am quite pleased with it's performance.

 

I also meant to mention previously the fact that the EPA also makes certain other agreements, 'suggestions', and assertions aside from KwH emissions with manufacturers. Of those, the ones we know well about are making it difficult for unauthorised persons to make carb adjustments. But what was eluded to beforehand, is the EPA have admonished manufacturers to not share this information with customers. They've also agreed not to sell exhaust that are easy to modify as well; such as the old two piece STIHL exhausts.  Some manufacturers have made it difficult to adjust timing, whether due to the ignition system, or the lack of a woodruff key. Some might even tell their retail outlets not to share any technical data or specs regarding emissions.

  • Like 2
Link to comment
Share on other sites

Log in or register to remove this advert

8 hours ago, David Dobedoe said:

Lots of great debate here, thanks.

I also like french bread.

Any thoughts as to starting with a factory fresh saw or something that has been used?

I’d go with an older pre auto tune model, I have a Husky 288 that’s barely used these days that would be ideal.

  • Like 1
Link to comment
Share on other sites

Just done a 288XP....bit of a funny one in so much as the owner had trouble starting it and it turned out that he hadn't been using that thumb lever lock between the throttle safety bar and the top cover....weird!

 

I have ported new and near new saws. I do advise the warranty will be void though and it is best to get a bit of use from the saw to ensure the manufacture is good before modification but it is up to the owner.

  • Like 3
Link to comment
Share on other sites

18 hours ago, wyk said:

These days when I do mod a saw, I tend to try and go more conservative than hot. I have an 044 that has had nothing but a dual port muffler added and some timing adjustment, and I am quite pleased with it's performance.

 

I also meant to mention previously the fact that the EPA also makes certain other agreements, 'suggestions', and assertions aside from KwH emissions with manufacturers. Of those, the ones we know well about are making it difficult for unauthorised persons to make carb adjustments. But what was eluded to beforehand, is the EPA have admonished manufacturers to not share this information with customers. They've also agreed not to sell exhaust that are easy to modify as well; such as the old two piece STIHL exhausts.  Some manufacturers have made it difficult to adjust timing, whether due to the ignition system, or the lack of a woodruff key. Some might even tell their retail outlets not to share any technical data or specs regarding emissions.

Wes that little saw you done for me  was very happy with the work you put into it 

its still going strong and sounds awesome only addition is I put a spark arrestor gauze 

in 

Link to comment
Share on other sites

1 hour ago, shavey said:

Wes that little saw you done for me  was very happy with the work you put into it 

its still going strong and sounds awesome only addition is I put a spark arrestor gauze 

in 

That saw has had a good working over. I contoured the lower transfer openings to flow more, raised the top xfers a bit, reshaped and changed the timing on the intake, removed the cat and a baffle, redid the exhaust oulet, and port matched the cylinder to the muffler. I think I also advanced the timing 6* or so. It had very good compression and squish, so I left those be.

I think the small amount of grinding on the lower transfers really helped fill all 6 of them rather well at most RPM's.

 

159686492.QWXIlChi.jpg

159686491.2K2uzNlD.jpg

 

Here it is in a relatively hard and goopey larch, and then buried in horse chestnut. It was wearing a standard kerf .325 chain on a 16" bar.

 

 

  • Like 1
Link to comment
Share on other sites

6 hours ago, Stubby said:

Strong saw that .

It's difficult to convey how much pulling power a saw has in a video unless it's sumfin crazy like that MMWS 044 I had with finger ports and set to run at 15K RPM I like to show here on occasion. I was pushing it in to that chestnut and it just kept cutting. The 420sc in this vid is sort of a big saw for it's discplacement, so the bar doesn't look as big as it is. But it weighs the same as a 241CM, and I think they are set up great from the factory. It had like .028 squish at it's max measurement, and produced 178PSI according to my records without any break in. A good saw that I highly suggest.

 

Ah hell, why not show folks what the other end of porting is like. This is what happens when you take a saw, grind it to within an inch of it's life, put a bigger carb on it, and mess about with the chain just to be safe, and then put way too much bar on it. Here's my Mastermind Work Saws 044 by Randy Evans. It was one of his personal saw test beds, so is rather drastically ported, more than he would do for a work saw usually. Back in 2010 or so, Randy and I had many discussions about the dynamics of what makes a saw work. The guy is pretty sharp, and I highly recommend his saws:

 

 

It might not look like it, but I am babying it and trying not to dog it in to the wood too much - I was afraid it would blow out the bottom end or bend the conrod.

Edited by wyk
  • Like 3
Link to comment
Share on other sites

On 03/12/2018 at 08:08, Woodworks said:

Just quoting what I have been told when asked about ported saw previously. Never used one myself. I want clean emissions without going to the expense of Aspen

Sorry to be the bringer of bad news but you will never get close to the emission benefits of running Aspen without actually using it.

 

An old chainsaw will have much lower benzene emissions running on Aspen than the leanest burning new models on the market running regular petrol.

 

  • Like 2
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share


  •  

  • Featured Adverts

About

Arbtalk.co.uk is a hub for the arboriculture industry in the UK.  
If you're just starting out and you need business, equipment, tech or training support you're in the right place.  If you've done it, made it, got a van load of oily t-shirts and have decided to give something back by sharing your knowledge or wisdom,  then you're welcome too.
If you would like to contribute to making this industry more effective and safe then welcome.
Just like a living tree, it'll always be a work in progress.
Please have a look around, sign up, share and contribute the best you have.

See you inside.

The Arbtalk Team

Follow us

Articles

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.