Another chainsaw dyno...

[Red97]

Ranchdad with same carb/filter as cfb. tune was on the rich side.



before/after carb and maxflo

 

[Sawrain]

Nice gain.

Tuned to 14k before? What about the after? For the carb and maxflow mod.

 

[Red97]

Muffler mod and gasket delete 394 vs stock 395

 

[Red97]

2149 j red vs 501p echo

2149 has had machine work, and a 357 carb and elbow. Stock muffler and no port work.

 

[ranchdadmike]

View attachment 252507
Ranchdad with same carb/filter as cfb. tune was on the rich side.

View attachment 252508

before/after carb and maxflo

I really appreciate all the extra work Joe. Al @drf256 is a wizard. Also, thanks to @Canadian farm boy for the loaner parts!

 

[huskyboy]

View attachment 252507
Ranchdad with same carb/filter as cfb. tune was on the rich side.

View attachment 252508

before/after carb and maxflo

Wow. Huge difference there! You bolted a echo 2511T to the mofo saw with those simple changes..... lol. I’m sure a lot of it was the carb, but it puts into perspective how bad the stock air filter setup is on those saws as well.

 

[Red97]

Stock 590 vs the Shindiawa raffle saw I built this spring.

@stihl livin

 

[Red97]

Nice gain.

Tuned to 14k before? What about the after? For the carb and maxflow mod.

Was over 14k before, just about 14k after.

I really appreciate all the extra work Joe. Al @drf256 is a wizard

No problem, looks like a maxflo could be a nice improvement.

Wow. Huge difference there! You bolted a echo 2511T to the mofo saw with those simple changes..... lol. I’m sure a lot of it was the carb, but it puts into perspective how bad the stock air filter setup is on those saws as well.

Pretty much.

 

[Red97]

I am 1 saw away from being all caught up with the dyno runs.

Have to switch the 404 sprocket on for those biggins..

 

[Bigmac]

Be cool to see a diesel chainsaw on the dyno. Torque would be higher than the HP on the graph.

All engines make more torque than hp under 5250 rpm, really measuring torque, and the hp formula is based on torque at rpm, same torque more rpm=more hp, the lines cross at 5250, at 5250 all engines make the same torque as hp

 

[MustangMike]

Hate to say this, but with that MOFO saw, I would really like to know how much is the carb and how much is the filter. Was the original filter clean before testing? That can make a huge difference.

I'm also thinking the carb membranes may have hardened and it needed a rebuilt.

Just thinking aloud here, it was an amazing difference!

 

[cuinrearview]

Joe any chance you could take the torque readings of the cylinder bolts, in N/M, of the two hybrids? Just to satisfy a curiosity. Thanks.

 

[sixonetonoffun]

That 501p stock isn't real exciting is it. Glad I went with the 261 cm. The 501p was very tempting.

Stock 490 v Stock 501p plot would be cool.

 

[dall]

Joe any chance you could take the torque readings of the cylinder bolts, in N/M, of the two hybrids? Just to satisfy a curiosity. Thanks.

always a excuse lol

 

[qurotro]

501p has a very restricted muffler insert on the outlet. I want to see what a 501 can do with muffler mod though.

 

[huskihl]

View attachment 252510

2149 j red vs 501p echo

2149 has had machine work, and a 357 carb and elbow. Stock muffler and no port work.

I haven’t read the rest of the thread yet, but that is actually now a 2153, or 346ne. Brand new, two or three cuts on it

 

[Wolverine]

View attachment 252509

Muffler mod and gasket delete 394 vs stock 395

Very interesting! I know 394's squish is pretty big and the reason the bgd helps it, what is the general consensus w/ the 95's? I felt the bgd and muff mod really woke up mine, wonder if it would sway that 95 graph a bunch?

 

[dahmer]

That 501p stock isn't real exciting is it. Glad I went with the 261 cm. The 501p was very tempting.

Stock 490 v Stock 501p plot would be cool.

My 490 and my buddy’s were absolute pigs before muffler work and removing carb limiters. Huge difference.

 

[Piston Skirt]

View attachment 252510

2149 j red vs 501p echo

2149 has had machine work, and a 357 carb and elbow. Stock muffler and no port work.

Something definitely wrong with 501’s settings. It’s torque peaks at 6,5-7k and normally there isn’t sign of that dip, which looks rather typical for mis-set L/H mixture changeover. Box carb settings?

 

[cuinrearview]

Nah there's gotta be an anomaly with those runs. Or maybe the scale. If a mushroom type saw is four horse what I know about saws is *s-word. I mean, it IS literally *s-word. But that graph has something amiss. Joe'll finger it out.