What's on your bench?

[usmcbuckwild]

View attachment 154132 Understand. I held a feeler gauge even with the base and it doesnt take much to make a flat spot on where the boot would seal up on the bottom. Good info considering i have bought a few saws including this one that wer killed by air leaks. Pic above is with no base gasket so im good on the up and down machining thankfully. U have the same pointer i do

Yeah, I figured if I jsed the same pointer you would recognize what I was pointing at

 

[usmcbuckwild]

So the more I look atthe 353 cylinder the more it bewilders me. There is potential to match the port perfectly to the base/case, but doing so breaks into the transfer cover bolt bosses. Is this on purpose? If the cylinder is opened up to match the case, will it result in a lazy port? Too much width/depth resulting in slow fill/lack of velocity? Is that why it has such a goofy squared off and impeding design?

 

[JohnnyBlade]

Yeah, I figured if I jsed the same pointer you would recognize what I was pointing at

LMAO!

So the more I look atthe 353 cylinder the more it bewilders me. There is potential to match the port perfectly to the base/case, but doing so breaks into the transfer cover bolt bosses. Is this on purpose? If the cylinder is opened up to match the case, will it result in a lazy port? Too much width/depth resulting in slow fill/lack of velocity? Is that why it has such a goofy squared off and impeding design?

This is the part i like the theory.......

 

[huskihl]

So the more I look atthe 353 cylinder the more it bewilders me. There is potential to match the port perfectly to the base/case, but doing so breaks into the transfer cover bolt bosses. Is this on purpose? If the cylinder is opened up to match the case, will it result in a lazy port? Too much width/depth resulting in slow fill/lack of velocity? Is that why it has such a goofy squared off and impeding design?

Fill the case to match the cylinder?

 

[tickbitintn]

I'm sure the end product is a trade-off of cost vs performance....
Ideally a perfect match and a smooth transition is best but at what production cost?
Also factoring in the intended user expectations...
That particular saw is in a gray area in my opinion, "pro" (metal cased) saw with not so pro performance compared to a 346 (essentially the same sans p/c).

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[tickbitintn]

Fill the case to match the cylinder?

Probably would perform better with more case compression and transfer velocity.
As in fill the lower transfers and smooth /blend them that way.

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[Stump Shot]

Looks like this 028 Super will live to cut another day. Saved by a new set of seals. Rest of the rubber parts and filters changed as a precaution.

 

[usmcbuckwild]

Fill the case to match the cylinder?

If you look at how much material is removed to match the case and port opening, you will lose pressure in the transfer. If the crank had a stuffer the now oversized lower port opening would make perfect sense. But, in original condition the transfer port has a large flat step at the very bottom and the port opening into the cyl is oddly shaped. Makes me wonder if there is issue with even more lackluster performance if properly matched.

A caveat to that is the 372xt lower transfer port openings. They are ridiculously choked from the factory.

 

[tickbitintn]

Looks like this 028 Super will live to cut another day. Saved by a new set of seals. Rest of the rubber parts and filters changed as a precaution.

View attachment 154137

Nice clean saw there.
Good save!

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[usmcbuckwild]

Probably would perform better with more case compression and transfer velocity.
As in fill the lower transfers and smooth /blend them that way.

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What about partially filling the transfer opening in the case?

 

[tickbitintn]

What about partially filling the transfer opening in the case?

Sure why not, fill both where it makes the most sense to make a smooth transition and increase velocity.

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[tickbitintn]

Rounded and smooth will always flow better than square and sharp edged.

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[usmcbuckwild]

Rounded and smooth will always flow better than square and sharp edged.

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Yes, less turbulence.

I’ll have to look more in depth at it tomorrow. I don’t think JB Weld is going to work. I really don’t want to weld that much inside the bearing cup.

 

[huskihl]

Yes, less turbulence.

I’ll have to look more in depth at it tomorrow. I don’t think JB Weld is going to work. I really don’t want to weld that much inside the bearing cup.

I'm sure it's been done before

 

[tickbitintn]

At least twice...
Lol

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[Wolverine]

I'm sure it's been done before

 

[Deets066]

View attachment 154140

 

[usmcbuckwild]

Very well. I stand corrected.

 

[usmcbuckwild]

View attachment 154140

Did you notice a performace difference?

 

[huskihl]

Just make sure it's degreased and rough up the area