Piston wash patterns

[Lightning Performance]

Most saws I see with cooked piston undersides were ran lean or with shît oil. When 2 of 4 of the same model were run on cheap oil and were cooked, and the other 2 were run on H1r and Red Armor are fine, should I only advance the last 2? Or recommend a better oil to the first 2?

That is very good question.
Running leaner with no hot spots makes more power and avoids other problems. You be the judge.

I didn't know I was supposed to laugh, or what to laugh about.

Keep up

 

[MustangMike]

Totally agree with you Kevin. When that cooked (almost new) 461 came in to me, the entire top of the piston was black but the plug looked brand new and the inside of the muffler was very clean.

I called the Tree Guy and said "you are running Stihl oil in that saw, right?". He sheepishly replied to me (we have had this conversations previously) "yes".

 

[Ketchup]

This one had the muffler gasket hanging in front of the exhaust port. The port didn’t have much crud in it. Interesting that the piston would have so much.

 

[HYPERSAWS]

Is that what the surface of Mars looks like wow.
What oil is that

 

[Ketchup]

Haha. No idea, but my guess is Stihl oil. Plug looked brand new, just like @MustangMike described.

 

[Ketchup]

020t.
Transfer roof was irregular both sides and the high points match the three washed zones. PTO side was 2 degrees ahead. Squish was .041”.

 

[huskyboy]

Stock mahle non decomp 288 wash tongue through the plug hole.

 

[Ketchup]

2511t. 2 years of steady abuse. Saw has a large muffler mod.

 

[huskyboy]

View attachment 303120
2511t. 2 years of steady abuse. Saw has a large muffler mod.

Wow lots of carbon

 

[NightRogue]

Wow lots of carbon

No thanks to the odd bent exit exhaust port and baffle in the muffler

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[Ketchup]

No thanks to the odd bent exit exhaust port and baffle in the muffler

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The baffle is pretty well mitigated on this saw, but the bend doesn’t help anything. I think this one is user error. L was 5 turns out when it came in.

 

[huskihl]

The baffle is pretty well mitigated on this saw, but the bend doesn’t help anything. I think this one is user error. L was 5 turns out when it came in.

Normal here is 2.5 - 3 turns out on each

 

[Ketchup]

Sounds about right.
Usually 1/4 turn either side of 2 in town (5600’). 1-1/2ish at my house (9400).

 

[NightRogue]

wash on that 2511t is a very interesting subject

For those who've been inside one of these, the upper transfers are angled differently(vertical) pto vs flywheel. Area on the pto side transfers are greater than flywheel side. Lower transfer stuffer could be more on reducing flow on one side rather than increasing pressure.

If you guys follow, the wash is pretty neat and carbon is in a pyramid shape. As if the exhaust port exit is straight out, looks like the engineera were trying to counter that odd exit by adjusting transfer angle and area

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[BonScott46]

The baffle is pretty well mitigated on this saw, but the bend doesn’t help anything. I think this one is user error. L was 5 turns out when it came in.

I have a 2511t that would not run out of the box. I could not get it to run right by following the factory instructions either. It has ended up at around 5 turns out on the low side in order to get rid of the bog and have it start on one pull.

 

[mettee]

View attachment 176213

Thoughts?

Handle bar Mustache

 

[mettee]

Dolly 5100s with intake and exhaust port only, and soda can gasket. Someone told me it looked okay I have no idea. This was after a couple tanks.

 

[NightRogue]

Handle bar Mustache

Pipe saw?

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[NightRogue]

Dolly 5100s with intake and exhaust port only, and soda can gasket. Someone told me it looked okay I have no idea. This was after a couple tanks.

View attachment 303272

Does it have muffler mod?
Looks pretty good to me

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[Ketchup]

wash on that 2511t is a very interesting subject

For those who've been inside one of these, the upper transfers are angled differently(vertical) pto vs flywheel. Area on the pto side transfers are greater than flywheel side. Lower transfer stuffer could be more on reducing flow on one side rather than increasing pressure.

If you guys follow, the wash is pretty neat and carbon is in a pyramid shape. As if the exhaust port exit is straight out, looks like the engineera were trying to counter that odd exit by adjusting transfer angle and area

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The cylinder flange and case are also very restrictive at the transfer lowers.