Inside the MS462C

[RI Chevy]

Whew. We are a tough crowd tonight. LOL

 

[maulhead]

Whew. We are a tough crowd tonight. LOL

I seen worse nights.

 

[RI Chevy]

Lol. True Dat.

 

[blsnelling]

...I'm not a mtronic fan and don't want to miss out on the tried and true 461.
What does everyone think?

Doesn't sound like there's a decision to be made. The 461 is one of the best 70cc class saws ever made, IMHO.

I've seen a couple of weird piston burns on 461s from the local tree guys. When you factor in that the vast majority of their saws are still 460s, you start to question things.

The only reason for that internal "bridge" in the 461 is to cool the piston. That has to tell you something.

Get rid of the heat problem, and I think they are great saws.

This is the first I've ever heard of heat issues in the 461. I would find that very surprising. Were they running with trimmed limiters and properly tuned carbs?

 

[MustangMike]

This is the first I've ever heard of heat issues in the 461. I would find that very surprising. Were they running with trimmed limiters and properly tuned carbs?

No, they were 100% stock. You do know that is the only reason for that internal bridge? (see pic #2).

A 461 piston failure from this year, and one from last year. (different users). A high ratio for the # of them in use.

I believe with muff mods and limiters out, they would be fine, and they have been since I did that to them.

 

[ferris]

No, they were 100% stock. You do know that is the only reason for that internal bridge? (see pic #2).

A 461 piston failure from this year, and one from last year. (different users). A high ratio for the # of them in use.

I believe with muff mods and limiters out, they would be fine, and they have been since I did that to them.

So much damage on the intake side?

 

[paragonbuilder]

No, they were 100% stock. You do know that is the only reason for that internal bridge?

Mike, how do you know with such certainty that is the only reason it is there? Do you have an insider at stihl engineering I don’t know about?

 

[stihl livin]

Mike, how do you know with such certainty that is the only reason it is there? Do you have an insider at stihl engineering I don’t know about?

I believe the video is from Stephen who has been doing the porting in this thread. I’ve been wrong before.

 

[paragonbuilder]

I believe the video is from Stephen who has been doing the porting in this thread. I’ve been wrong before.

Mike is talking about the 461

 

[stihl livin]

Mike is talking about the 461

I must have missed that one.

 

[paragonbuilder]

I must have missed that one.

Post #405

 

[MustangMike]

Mike, how do you know with such certainty that is the only reason it is there? Do you have an insider at stihl engineering I don’t know about?

Randy researched it and reported it.

 

[paragonbuilder]

Randy researched it and reported it.

Ah,
I thought I remember him saying he could see no other reason for it. I must be mistaken. Carry on.

 

[MustangMike]

You may be correct, but he did ascertain it was there to deflect fuel to cool the piston. There must of been a problem for them to develop that, and it seems to serve no other function.

 

[nohoff]

The MS 462 has a bridge too.
Its part of the crankcase.

 

[MustangMike]

The MS 462 has a bridge too.
Its part of the crankcase.

Do you have any contacts that will know the purpose of that bridge?

 

[Dub11]

I thought that bridge this was acting like a stuffer to help case compression.

 

[nohoff]

The bride just ends at the intake.
Official Stihl TI for the MS 461 says the bridge is for optimizing the flow in the crankcase.
But i dont see any sense in pushing those air on the bottom of the piston, when the transfers are on the other side of the crankcase.

 

[blsnelling]

I think way too much is being read into this. I don't see anything that looks heat related to me.

 

[blsnelling]

So much damage on the intake side?

The one looks like it was run with little to no air filtration, then finally failed. The other looks like a piston failure as well.