Another chainsaw dyno...

[Czed]

Lots of activity in the 20cc class

Yet another lead change.
View attachment 247453
View attachment 247452

That's child abuse

 

[ranchdadmike]

Some squeak by, others get held up way too long.

Some sit in Lansing forever..

 

[Nutball]

What was the peak HP for the ported CS8000? We never got a graph, just a max torque at 6200rpm.

 

[Billy Currie]

From what I have seen there is nothing to be ashamed of that anyone has done. We all are on different levels with different resources at our finger tips. A dyno is a very reliable resource that tells a builder what works and what doesn't. The best way to use a dyno is small changes and retest, so if someone makes changes and gains power, then that is worthy of a pat on the back. The same can be done with a stopwatch and a block of wood.

 

[Red97]

What was the peak HP for the ported CS8000? We never got a graph, just a max torque at 6200rpm.

8.14

 

[Deets066]

I’ve got some saws to send to fill up a few more of those slots on the leader board when I get back home Monday.

 

[Red97]

I’ve got some saws to send to fill up a few more of those slots on the leader board when I get back home Monday.

That sounds like a great plan.

I'm just going to stick with the
10cc classes.

The few oddballs can get their own class.

357
365 48mm
6400 will probably run the same class.
665 as well.


What are some of the other popular odd balls?

 

[Czed]

That sounds like a great plan.

I'm just going to stick with the
10cc classes.

The few oddballs can get their own class.

357
365 48mm
6400 will probably run the same class.
665 as well.


What are some of the other popular odd balls?

Wild thing

 

[Deets066]

That sounds like a great plan.

I'm just going to stick with the
10cc classes.

The few oddballs can get their own class.

357
365 48mm
6400 will probably run the same class.
665 as well.


What are some of the other popular odd balls?

10cc classes is fine

 

[Red97]

Wild thing

Think most of those will be 40cc

 

[mdavlee]

Those

That sounds like a great plan.

I'm just going to stick with the
10cc classes.

The few oddballs can get their own class.

357
365 48mm
6400 will probably run the same class.
665 as well.


What are some of the other popular odd balls?

They aren’t really odd balls. They’re on the cubic inch upper limits. I know it helps the stihl guys out to separate them more to give them hope of having a class leader

 

[Lightning Performance]

That’s the way I understand it as well.
I’ve been told a previous chainsaw dyno using a mechanical brake (motorcycle maybe) could generate huge numbers instantaneously by applying said brake too rapidly.
Makes sense.
As for rotating mass in a two stroke, my sentiments are as follows.
Anything more than enough to overcome the drag of friction, flywheel fan, case compression, mass airflow, compression and engine load, during the roughly 75% of one rotation that does not include the power stroke, While maintaining minimal engine speed loss, is excessive and contributes only to slow the response to change of RPM due to inertia.
Larger rotating mass does hold some stored energy once it is created, but I don’t it believe it aids in creating it, therefore it is of no benefit in a full useable RPM range dyno pull as you are exhibiting.

Yes you can create more power with a lighter reciprocating assembly. Oh, sorry, never mind... your still stuck on that spinny roundy stuffs.

Night night ladies.

 

[Sawrain]

Yes you can create more power with a lighter reciprocating assembly. Oh, sorry, never mind... your still stuck on that spinny roundy stuffs.

Night night ladies.

Can we though? No one here is approaching the material limits of the connecting rod due to heavy pistons, if they are we are beyond work saws.

Energy’s from the crank is used to accelerate the piston on each passing of tdc and bdc, but that energy is transferred back into the crank every time the piston starts to decelerate approaching bdc and tdc, outside of friction and the second harmonic due to a 90 degree crank not being equal to half stroke there probably isn’t a lot for us to gain down that path.

The assembly already does a good job of conserving total energy, it’s just transferring between linear and angular momentum.

Lighter pistons and rods will for sure make a faster accelerating saw, but especially because in this situation the dyno run is from high to low RPM I don’t not think there is much power to be made down the lighter rod/piston road.

 

[rogue60]

Well, I have to thank you Mason, your video made EVERYONE else underestimate the power of my saw!

They all thought "it was the chain" was just an excuse!

Actually for me that video made me realise damn the flying tiger has some grunt you only leaned on it with your hole body weight and it didn't bog! Lol

 

[rogue60]

Without a doubt the best part of the hole dyno hp/torque king thing is the owner and referee!
Hats off to Red97 nothing is biased or petty just straight up this is the factual numbers..

 

[Duane(Pa)]

Facts are hard to find...... #2020

 

[Red97]

Can we though? No one here is approaching the material limits of the connecting rod due to heavy pistons, if they are we are beyond work saws.

Energy’s from the crank is used to accelerate the piston on each passing of tdc and bdc, but that energy is transferred back into the crank every time the piston starts to decelerate approaching bdc and tdc, outside of friction and the second harmonic due to a 90 degree crank not being equal to half stroke there probably isn’t a lot for us to gain down that path.

The assembly already does a good job of conserving total energy, it’s just transferring between linear and angular momentum.

Lighter pistons and rods will for sure make a faster accelerating saw, but especially because in this situation the dyno run is from high to low RPM I don’t not think there is much power to be made down the lighter rod/piston road.

We shall see.

Project ultra light coming down the pipe.


Maybe a different feel, but I don't expect much if any gains in power. Going to test it on a 100% stock saw first. Then moved to modified.

 

[rogue60]

We shall see.

Project ultra light coming down the pipe.
View attachment 247541

Maybe a different feel, but I don't expect much if any gains in power. Going to test it on a 100% stock saw first. Then moved to modified.

What's the go with the crank is that for lightness or both lightness/turbo crank thinking behind it's creation?
My take on a turbo crank 35cc put it this way it sure didn't hurt power going on seat of the pants performance that is.
I made sure they had a descent hook to help move air up the transfers that was the aim anyway...

 

[Red97]

What's the go with the crank is that for lightness or both lightness/turbo crank thinking behind it's creation?
My take on a turbo crank 35cc put it this way it shore didn't hurt power going on seat of the pants performance that is...
View attachment 247542

Think it is a blend of turbo, and light. But this is the first try with one.

I think a true " turbo " crank is supposed to attempt to scoop the charge and throw it up the transfers.

 

[rogue60]

Think it is a blend of turbo, and light. But this is the first try with one.

I think a true " turbo " crank is supposed to attempt to scoop the charge and throw it up the transfers.

That's awesome trying something different you only have to go on RC forums to see how stagnant chainsaw porting has become is just the same old for the last decade or so lol
What about piston gas porting it used to common in the 2T dirt bike world as a proven gain in power but can't say I've seen anyone go out of the norm and try it in the chainsaw porting world?
To worried what MustangMike is up to maybe is the loss of focus for some perhaps? Lol