Another chainsaw dyno...

[Red97]

Any updates to the dyno that could bump the numbers up a little?

View attachment 361057

No, nothing has changed since converting to the "new" system.

The paper graphs are all from the same system. The excel graphs were from the old system. Everything has been staying repeatable.

 

[ferris]

I think what is meant is that every dyno is going to produce individual results based on who built it. So theoretically the numbers are subjective to that machine but not universal.
Joe's should be close to factory correct though.

That is what I mean. You can see the gains of about 3hp. I believe that.

It was a very stout "stock" 064 Joe put as the comparison graph. Built from NOS hand picked parts as well as it was muffler modded.

That is the point we’re I don’t believe the numbers, stock is 6,5 hp. Even with good parts.

but as I said the numbers are not so important. Important is the difference between stock and modified

 

[srcarr52]

That is what I mean. You can see the gains of about 3hp. I believe that.

That is the point we’re I don’t believe the numbers, stock is 6,5 hp. Even with good parts.

but as I said the numbers are not so important. Important is the difference between stock and modified

I think you missed it, the graph is of 2 different saws. A really healthy stock cylinder with a muffler mod and the 064 I built. A normal stock 064 would put up around 6.5 hp on Joes dyno.

 

[ferris]

I think you missed it, the graph is of 2 different saws. A really healthy stock cylinder with a muffler mod and the 064 I built. A normal stock 064 would put up around 6.5 hp on Joes dyno.

I don’t miss that, only wont believe the 7,5 hp. 15% over stock numbers.
Joe do u dyno a other 064 in the last time? What were the results?

 

[farminkarman]

I don’t miss that, only wont believe the 7,5 hp. 15% over stock numbers.
Joe do u dyno a other 064 in the last time? What were the results?

Some stock saws put out hp numbers very close to advertised and some don't. It is possible that many 064's were leaving the factory with more than 6.5 hp. A modern-day example of this is the Husqvarna 550xp...they advertise it at 4hp, but that is considerably underrated.

 

[MustangMike]

I believe the original Magnum 066s (with just a DP muffler) were rated 1/2 Hp higher.

 

[Nutball]

Makes you wonder what Shaun's secret is.

 

[davidwyby]

This is a good page number.

 

[farminkarman]

This is a good page number.

Maybe someday I will have a 288 worth keeping

 

[davidwyby]

Maybe someday I will have a 288 worth keeping

Me n this other guy have some pieces…

 

[Duane(Pa)]

Let’s not go here guys. This is quantification of crankshaft output without all the chain variables and other factors involved with stopwatch evaluation. I used to think the loudest saws were the moast powerful...

 

[Woodpecker]

In general published horse power numbers have been the lowest possible denominator to CYA for a long time. More specifically a prime example is when you hear of certain builders looking for one in a thousand 064 jugs. Some just came out extra special and that is why. Anecdotally we’ve all heard the joke that a certain piece of equipment must have been a Friday afternoon or Monday morning saw when it is kind of a piece of junk. It’s silly to be doubting on Joe’s dyno. True there will be variability from different dynos but the variability from the same machine is negligible.

 

[farminkarman]

In general published horse power numbers have been the lowest possible denominator to CYA for a long time. More specifically a prime example is when you hear of certain builders looking for one in a thousand 064 jugs. Some just came out extra special and that is why. Anecdotally we’ve all heard the joke that a certain piece of equipment must have been a Friday afternoon or Monday morning saw when it is kind of a piece of junk. It’s silly to be doubting on Joe’s dyno. True there will be variability from different dynos but the variability from the same machine is negligible.

Well said

 

[Ketchup]

In general published horse power numbers have been the lowest possible denominator to CYA for a long time. More specifically a prime example is when you hear of certain builders looking for one in a thousand 064 jugs. Some just came out extra special and that is why. Anecdotally we’ve all heard the joke that a certain piece of equipment must have been a Friday afternoon or Monday morning saw when it is kind of a piece of junk. It’s silly to be doubting on Joe’s dyno. True there will be variability from different dynos but the variability from the same machine is negligible.

It’s worth keeping an open mind about testing procedures. I would bet Joe is very conscious of the repeatability of his dyno runs. If it seems wrong I’m sure he would run it again.

Shaun’s 064 does put up some incredible numbers. Really impressive.

I don’t think there’s anyone doubting Joe or Shaun’s work. They’re both some of the very best. We’re all just trying to learn.

Makes you wonder what Shaun's secret is.

Sure does. But without more details to compare Scott and Shaun may never know themselves.

Let’s not go here guys. This is quantification of crankshaft output without all the chain variables and other factors involved with stopwatch evaluation. I used to think the loudest saws were the moast powerful...

Too right. What a graph says won’t necessarily win races or drop trees faster. Setup, maintenance, and operator matter most of all.

I just delivered a saw to a customer. He fired it up and revved it. Without ever cutting a stick he was disappointed. “Can you make it louder”.

 

[Mastermind]

I think you missed it, the graph is of 2 different saws. A really healthy stock cylinder with a muffler mod and the 064 I built. A normal stock 064 would put up around 6.5 hp on Joes dyno.

Anyone who knows you knows that your work is second to none. In terms of both quality, and performance.

Period.

 

[Woodpecker]

I don’t think there’s anyone doubting Joe or Shaun’s work. They’re both some of the very best. We’re all just trying to learn.

Except there literally just was someone doubting. What about my statement says I don’t have an open mind? I think Joe has more than proven his testing process is repeatable and consistent throughout the course of this thread. There has been very little variability.

 

[Woodpecker]

Anyone who knows you knows that your work is second to none. In terms of both quality, and performance.

Period.

Word!

 

[farminkarman]

There were two main reasons why I even posted the results from that 064. One was to give Shaun props for a job well done, and two, to demonstrate that displacement isnt' everything. Stihl obviously had something good going with the port configuration on many of the 064's. I feel bad that posting the results led to people casting shade on both Joe's dyno and Shaun's work with no basis. Nobody bothered to question other results I have posted, and one of them had an even higher hp/cubic inch than this 064.

 

[Woodpecker]

There were two main reasons why I even posted the results from that 064. One was to give Shaun props for a job well done, and two, to demonstrate that displacement isnt' everything. Stihl obviously had something good going with the port configuration on many of the 064's. I feel bad that posting the results led to people casting shade on both Joe's dyno and Shaun's work with no basis. Nobody bothered to question other results I have posted, and one of them had an even higher hp/cubic inch than this 064.

I don’t think you should feel bad at all Greg!

 

[Ketchup]

There were two main reasons why I even posted the results from that 064. One was to give Shaun props for a job well done, and two, to demonstrate that displacement isnt' everything. Stihl obviously had something good going with the port configuration on many of the 064's. I feel bad that posting the results led to people casting shade on both Joe's dyno and Shaun's work with no basis. Nobody bothered to question other results I have posted, and one of them had an even higher hp/cubic inch than this 064.

I’m glad you posted. And @Nutball too. It’s really interesting.