Mastermind Meets The MS400 C-M

[Mastermind]

Ok. Maybe this year it will be too cold to have cabin fever? Let us talk of saws and pistons and stratos n stuff

I did try....

Didn't turn out so well.

 

[Duane(Pa)]

I like the saw. I wish I had bigger wood; you know, to use it on. For like cutting it up n stuff

 

[Mastermind]

I like the saw. I wish I had bigger wood; you know, to use it on. For like cutting it up n stuff

I wish I had bigger wood too.

 

[Johnmn]

I like the saw. I wish I had bigger wood; you know, to use it on. For like cutting it up n stuff

I wish I had bigger wood too.

Don't we all!

 

[morewood]

I wish I had bigger wood too.

Don't we all!

Nope. I'm happy with all the wood I have.

Mr Awesome

 

[Wood Chopper]

Give me the saw! Lol.

Sent from my iPhone using Tapatalk

 

[Nutball]

I wish I had bigger wood too.

Strap 4 chunks of 12x12 cant together if you have enough.

 

[TreeLife]

I wish I had bigger wood too.

This feels attacky...have you been talking to my misses? Lol

 

[farminkarman]

Back to question asked about piston weight, Stihl listed it at 70 grams.

 

[Mastermind]

Back to question asked about piston weight, Stihl listed it at 70 grams.

Oh yeah?

 

[farminkarman]

Oh yeah?

 

[MustangMike]

Thanks, you answered the million dollar question! A larger piston that is 14% lighter ... that is big news!

I would think that would put less stress on the bearings and they would last longer.

 

[Woodpecker]

Thanks, you answered the million dollar question! A larger piston that is 14% lighter ... that is big news!

I would think that would put less stress on the bearings and they would last longer.

Ask long as that coating on the piston holds up…

 

[Mastermind]

Ask long as that coating on the piston holds up…

Doesn't look coated to me. Same all over. Inside and out.

 

[Mastermind]

After some reading....seems it might be ceramic coated. I wish Stihl was more forthcoming with details.....

 

[farminkarman]

After some reading....seems it might be ceramic coated. I wish Stihl was more forthcoming with details.....

Given how reactive magnesium is, I would think the piston is coated.

 

[Ronie]

I wonder how the saw will react to increasing compression because magnesium doesn't conduct heat as much as aluminum.

 

[MustangMike]

I imagine a good ceramic coating would be very durable.

If fact, I think Stihl was saying that this piston usually does not need to be replaced if you have a lean burn.

Not sure how you would know if there is no transfer on the cylinder???

 

[farminkarman]

I wonder how the saw will react to increasing compression because magnesium doesn't conduct heat as much as aluminum.

Higher compression ratios do cause an increase in the charge temperature right before combustion, but the combustion itself happens more efficiently with less heat loss to the piston & cylinder. So, don’t assume that higher compression in a chainsaw is going to make more heat in the cylinder. A higher average power output that a ported saw can produce would be a bigger cause of extra heat. Going back to compression…those of you who have messed with Diesel engines have probably observed that they can be difficult to warm up in cold weather. This is because Diesel engines with their high compression ratios lose less heat to the cylinder wall and head (one of the big reasons they are more efficient than a gasoline engine).

 

[Ronie]

Here's an old article about magnesium pistons, not a lot of info but interesting.

https://www.highpowermedia.com/Archive/magnesium-as-a-piston-material