Snellerized MS461 on the dyno

[nmurph]

I've never thought break-in made a huge difference. The difference might be a couple or three tenths of an HP.

Nice job, Brad!

 

[blsnelling]

I've never thought break-in made a huge difference. The difference might be a couple or three tenths of an HP.

Nice job, Brad!

I never did either, but this has me wondering. Chad, does your 461 feel that much stronger than when new? Honestly, this has me more intrigued than my saws results. IIRC, I predicted 8HP @ 10,500, so wasn't far off.

 

[mdavlee]

Nice looking graph.

 

[Lignator]

If only I had a good way to record sound. The sound of a good ported saw loaded on the dyno is absolutely fantastic. I was amazed at how well this saw ran. It pulled hard yet idled beautifully.

there are some great freeware software applications on the internet for sound recording and manipulation. get yourself a cheap microphone, plug into PC and record. you can then end the sound clip and save as a wave file.

we use this at work to isolate and identify certain offensive frequencies in the products we make.

 

[Lignator]

additionally, i applaud the effort that went into building this dyno. numbers don't lie. even if your absolute numbers are off a bit at least the differential is real and meaningful.

i have been digging around here over the past few weeks and read quite a few threads around your dyno build.

 

[chadihman]

That's a lot of deviation in stock saws tested. Best I remember, the earlier stock 461 tested was 5.9HP and this one is 6.7HP?

.789 increase to be exact. I looked back in the weather archives and found the weather data for the August date when I tested it and yesterdays data and entered it in the calculator. .944 correction brings yesterdays stock 461 max hp to 6.4hp. 8/22/14 has a correction of 1.008 bringing its max hp to 6.04 hp
So with the corrections added my stock 461 gained .36 hp since it was last tested. That could have very well been from a good thorough break in.

 

[blsnelling]

.789 increase to be exact. I looked back in the weather archives and found the weather data for the August date when I tested it and yesterdays data and entered it in the calculator. .944 correction brings yesterdays stock 461 max hp to 6.4hp. 8/22/14 has a correction of 1.008 bringing its max hp to 6.04 hp
So with the corrections added my stock 461 gained .36 hp since it was last tested. That could have very well been from a good thorough break in.

Excellent. So that would make the ported saw corrected to 7.54 HP?

 

[Tor R]

Pop or not, its how well the ending result that mather, and this one looks amazing.
Great job Brad

 

[chadihman]

This is a fairly simple dyno, and SAE corrections may not be as applicable to small two strokes. Basically, you are going to have to look at percentage of improvement vs stock rather than absolute numbers. This dyno is perfect for seeing how porting changes affect the power band, but really bad for pissing matches. Your saw made a really nice gain over stock, the absolute number is meaningless

I'd give ya 100 likes if I could. I've emphasized this many times. I should go back and delete the old graphs so they cant be picked at. All that matters is the % of increase or decrease from the base saw at the time of testing.

 

[mountainlake]

49.2% gain at 12000 rpms This saw will pull really well in wood with the right sprocket and chain combo from 9000-11000 rpms. It'll run better at any rpm really. The saw mounted tach is nice Brad. Nice and small with a clean look. The dyno results and the saw mounted tach will tell you where its best cutting speed is.

How do you come up with a 49.2% gain at 12000 rpm. The ported saw should be run at 10000 rpm and the stock at 9000 rpm and it's better to error on the low side as torque increases with less RPM. Steve

 

[chadihman]

I never did either, but this has me wondering. Chad, does your 461 feel that much stronger than when new? Honestly, this has me more intrigued than my saws results. IIRC, I predicted 8HP @ 10,500, so wasn't far off.

My 461 has been the most impressive stock saw I have ever run. I feel it gets stronger every time I run it. I ran It back in September and October with my 36" bar on it. I can't stop talking about how well that beast pulled that 36" bar through oak. I'd like to mod the oiler to get a bit more oil.

 

[chadihman]

I want one…& not the dyno

Good it's not for sale.

 

[chadihman]

Excellent. So that would make the ported saw corrected to 7.54 HP?

Yep

 

[Ron660]

.789 increase to be exact. I looked back in the weather archives and found the weather data for the August date when I tested it and yesterdays data and entered it in the calculator. .944 correction brings yesterdays stock 461 max hp to 6.4hp. 8/22/14 has a correction of 1.008 bringing its max hp to 6.04 hp
So with the corrections added my stock 461 gained .36 hp since it was last tested. That could have very well been from a good thorough break in.

Chad, what were the temperature differences from those two different dyno testing dates? I agree, the percent increase is the real data we're looking for. That means my 660 during the winter, and after break-in, is probably over 8.5HP!

 

[chadihman]

How do you come up with a 49.2% gain at 12000 rpm. The ported saw should be run at 10000 rpm and the stock at 9000 rpm and it's better to error on the low side as torque increases with less RPM. Steve

I was showing how the ported saw has gobs more torque at 12000 rpms vs the stock saw at 12000 rpms.

 

[chadihman]

Chad, what were the temperature differences from those two different dyno testing dates? I agree, the percent increase is the real data we're looking for. That means my 660 during the winter, and after break-in, is probably over 8.5HP!

Something like 45 degrees difference. I remember that august day being very cool and the archived data shows 76 deg F that day. I'm positive your 660 would pull harder now.

 

[Mastermind]

Looks great.

Nice job for sure.

 

[Outlaw5.0]

I like to keep the compression under 200. I don't see the need for more than that. Less stress on the bottom end and not necessary for a super stout work saw. That's just my opinion and build style.

I agree on the stress Brad, plus everyone has their style. For my personal saws its more of R&D to see how much compression it can handle. So far I don't use them enough to find the breaking point. Maybe it would over heat in 100 degree weather, I just don't know. Of course good 94-100 octane fuel is used for those 200 plus psi saws, no reason to chance it.

 

[Trx250r180]

Like was said before ,nice curve on the graph ,you get an attaboy

 

[Tnshaker]

That is VERY impressive!!!