Work Saw Collector
GTG Coffee Maker
Threads like this are one of the reasons I hang around so much. Cool post Brad.
Progressive Modding of a Dolmar 7900
- Thread starter blsnelling
- Start date
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It sounds good and looks really professional.
I think the muffler cage on the 7900 is tuned, and gives you a bit of scavenging. If you look at the cage you can see it flows a ton, and is not really restrictive at all.
I think the muffler cage on the 7900 is tuned, and gives you a bit of scavenging. If you look at the cage you can see it flows a ton, and is not really restrictive at all.
spacemule
The Peanut Gallery
And this is why you have to be leery of places like this. Three people congratulating Brad when he just posted that it didn't help. He did make it louder and trailer house worthy though. ;-)
Work Saw Collector
GTG Coffee Maker
Thats not the point.
TRI955
I'm the man in the box
Space, is your glass always half empty???
The reason people are congratulating him, is because he's being completely open, and is sharing his results, good or bad on a public forum.
I think a lot like jashar's post a while back when he modded a 7900 the gain's on this saw just do not seem worth the time and effort to me when you can have the same work done to similar cc size saws and see dramatic gains.But I do like the vid's Brad and your enthusiasm to get every little bit out of a saw.Keep up the good work.
fredmc
Addicted to ArboristSite
I cut the front off the cage in mine and added a 9/16 tube. It made a big difference with mine.
super3
Addicted to ArboristSite
Those that want to mod one will now know what doesn't work. How do you think all this stuff gets figured out? Lots of failures to get to the point where you know what works.
If a tree falls in the Forrest and there is no attorney there to hear it, can anyone really capitalize or earn from its negligent actions....
If you ignore him he will go away....
( just ask Kevin Costner...have you seen has last few movies ?)
If you ignore him he will go away....
( just ask Kevin Costner...have you seen has last few movies ?)
That's a good idea, maybe the pipe helps. I know of a few good running stock 7900, that have muffler mods with pipes.
So which one's the Dolmar 7900-->Got it Kevin Costner
brncreeper
Addicted to ArboristSite
How's the compression and squish?
To me, the new muffler side port looks much better than a frontal dill job.
To me, the new muffler side port looks much better than a frontal dill job.
B_Turner
Addicted to ArboristSite
I love the progressive vid thing. The truth is in the cutting, not the volume.
Thanks and keep it coming , Brad.
Thanks and keep it coming , Brad.
spacemule
The Peanut Gallery
AUSSIE1
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opcorn: on all accounts.Naw i was referring to Space...he's an aspriring attorney....if you don't argue with him....
the 7900 is way too good of a machine to be ignored...Brads just trying to tweak a little more out of one...
I blocked of the factory exit with a piece of sheet metal the same shape as the screen. I'm guessing the new port to be about equal to yours Andy. The times only changed a few tenths. However, only one stock cut was faster than all four of these in this next video. IMHO, the bottom line is, there's no need to mod the muffler on a stock 7900. I personally like the way it sounds better, but the cuts times didn't change much at all.
I'm going to go ahead and pop the P&C off and get work inside. I'll play with the exhaust tuning some more once it's ported.
BTW, I've now got one tank of fuel through it.
I have not measured compression or squish. I will before I tear it down.
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/95sNuayCTIw&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/95sNuayCTIw&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
I'm going to go ahead and pop the P&C off and get work inside. I'll play with the exhaust tuning some more once it's ported.
BTW, I've now got one tank of fuel through it.
I have not measured compression or squish. I will before I tear it down.
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/95sNuayCTIw&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/95sNuayCTIw&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
I've also got to quit playing with the muffler because I'm working up to the larger end of the log. You'd think I'd learn to start on the big end
