Saw video thread

[X 66 stang347 X]

That was a Mahle cylinder

 

[jmssaws]

I feel the bigger the chamber, the more air/fuel you can trap above the piston. The more air/fuel you can trap/burn, the higher potential for power output.

Building alcohol 250cc bike motors we always increased the cc of the chamber.

 

[jmssaws]

That was a Mahle cylinder

It does run good
I had to get rid of 75lb of compression and opening the chamber is all I could think of.
Narrowed the band and blended to the rest of the chamber.
Maybe not ideal but it wasn't a ideal situation.

I knew compression would be a problem but I never thought it would be that high or I would have cut the crown some.
Hind sight is 20/20 I hear. Lol

 

[paragonbuilder]

Building alcohol 250cc bike motors we always increased the cc of the chamber.

Is there a theoretical ratio of how big the combustion chamber should be?

 

[jmssaws]

Is there a theoretical ratio of how big the combustion chamber should be?

That's over my head but I bet there is.

Seems to me that a 2 stroke would be better with more chamber volume, seems it could possibly hold more charge before the exhaust closed.
It works in my head anyway

 

[Manofstihl066]

This is off subject but for the love of God why can't the NFL get a decent halftime show?! Get some Metallica or something!

 

[MustangMike]

Hey, I guess ball inflation does matter!

 

[Manofstihl066]

Haha yes sir! I'm a falcons fan but I didn't expect a 21-3 at the half.

 

[RI Chevy]

Sad, but Pats are getting outplayed, out coached and anything else one could say.
They will make a comeback.
Turnovers kill

 

[Manofstihl066]

Ur right. I've been watching the falcons long enough to know they need a huge lead at the half to have a chance at winning. Brady does look a lil rattled though.

 

[RI Chevy]

Looks a little unprepared. I am kind of shocked. Terrible game plan.

 

[Deets066]

My 066 has .050 cut from the cylinder wall tapered up to the chamber, then another .020 cut flat. If it was all cut flat it would've been 240 psi. It lives at 215 and has a little more chamber than being just flat as well

 

[Moparmyway]

My 066 has .050 cut from the cylinder wall tapered up to the chamber, then another .020 cut flat. If it was all cut flat it would've been 240 psi. It lives at 215 and has a little more chamber than being just flat as well

What angle did you cut the taper ?

 

[Deets066]

What angle did you cut the taper ?

Not sure, it was a while back and I didn't do the machining. It was actually a miscommunication that worked out for the better

 

[jmssaws]

My 066 has .050 cut from the cylinder wall tapered up to the chamber, then another .020 cut flat. If it was all cut flat it would've been 240 psi. It lives at 215 and has a little more chamber than being just flat as well

I like the idea of a dual angle on the band.
Seems like it would be more efficient

 

[jmssaws]

I'm going to try a stock chamber for the first time in a while.

 

[Deets066]

I like the idea of a dual angle on the band.
Seems like it would be more efficient

I think it should be.

 

[awol]

390 with RWJ5 carb, unlimited coil, pop-up piston, and good muffler mod. It's still not nearly as strong one with the limted coil and cut chamber with lower EX

Basic Woods ported 460; small muffler mod.

 

[94BULLITT]

I ran the 290, 660, and the 441 today with the same bar and chain. It was the chain that was on the 290 in the other video and it had not been touched. Then I also ran the 25'' bar and chain I had on the 441 from the 290 vs 441 video and it had not been touched since the video either to show it was not dull. The results confuse me. I'm almost thinking that you will never know what saw is the fastest. I've heard that this saw is faster with a 20'' bar and another is faster with 32'' but I think that can ever vary from soft to hardwood. I'm still not done messing with this saw. I feel like there is more left in it.

If you watch the original video the 441 gets passed about halfway through the log. Maybe I was not loading the 290 as much as my Dad was and that is why the results are different????

 

[Crzybowhntr]

Yeh.
Best running 395 I've had my mits on.
Lot of time and skill involved in it.
Takes a very very good 066 cylinder to beat it or run with it.
My 394's will get it in certain situations but not others.
The main difference between it and a 394 is the 395 has a little more forgiveness on and off the throttle where the 394 is very snappy and more violent.
Lot of work has to be done on a 394 to run with it too.
Last one I had 8 to 10 hours in just grinding.

With a 9pin and a 24" his old 395 is fun

That was crazy awesome.