400 CM Build

[Hinerman]

Man, its been awhile I shook your hand. Hows tricks?

Too long. It was good to see you post. Hope all is well. I am doing well, all things considered...

 

[drf256]

Good morning.

Jug done. Onto the mufkin after the day job.

The exhaust port has some plating and a Husky-Esq groove outside the port window. The port is quite thin, unlike the older jugs. I left it alone.

 

[drf256]

 

[drf256]

I widened the exhaust to 32.5mm, which is 65% of bore.

I use paraffin wax and a lube for cutting the uppers.

 

[drf256]

104.5/118/120

 

[drf256]

Is plating holding up to the alumahawg?

Yes, remarkably well. The factory plating doesn’t flake off like the AM stuff. It’s quite adherent.

The toughest plating I’ve ever personally came across is, by far, Meteor AM plating. It’s tougher than anything I’ve ever ground on.

 

[Duane(Pa)]

Yerman R&D meeting after the Christmas party…”Let’s try gashing the exhaust port” (I can’t speak or typeGerman)

 

[jurchybald]

Port work is superb. We get to see any video?

 

[Sloughfoot]

Yes, remarkably well. The factory plating doesn’t flake off like the AM stuff. It’s quite adherent.

The toughest plating I’ve ever personally came across is, by far, Meteor AM plating. It’s tougher than anything I’ve ever ground on.

Good to hear. Been concerned that Stihl may lower the quality of their plating like it appears the competition has.

 

[drf256]

Snow dampered my time and will damper finding a suitable test log.

Finished the jug, timing advanced. Did a little mod on the air inlet, it seemed choked down.

Hoping to get some cut vidja’s next weekend.

The muffler plan has not been finalized. I prefer a side outlet at the rear of the can. Good flow and noise canceling in that location.

 

[drf256]

 

[drf256]

 

[K Mueller]

some fine looking work as always

 

[Duane(Pa)]

Knot your father’s Oldsmobile…

 

[Gary Courtney]

View attachment 480163View attachment 480164View attachment 480165View attachment 480166View attachment 480167

Do you have a block that you mold deflectors over?

 

[drf256]

Do you have a block that you mold deflectors over?

I do not.

I wound up opening up the factory outlet on the saw and not adding the extra deflector. I went to around 80%.

I added an internal baffle of SS to prevent the exhaust and sound waves from short circuiting out of the rear opening. It forces the gasses to go forward and hit the front of the can before they can vent out of it. Should flow well and hopefully reduce the decibels of the saw at the same time.

I’ll post pics at some point.

 

[drf256]

I relieved the AF holder so that any spitback could get sucked into the strato’s. Seems to make a difference on the Dyno I’ve been told. I didn’t take a post grinding pic, but I ground the ares marked in pastel blue away.

 

[drf256]

Here is the muffler baffle. I still feel it helps to stop a short circuit out of the deflector. Any saw I’ve done where u can check the piston without opening the muffler has been unreasonably loud. This quiets it down quite a bit.

Not my best welding, but I tig brazed the piece of stainless steel to the inside of the can without blowing through. Was a rough angle to weld at, and I am rusty as all hell. It certainly ain’t moving.

I am itching to light the fuse, but everything here is under a foot or two of snow. It’s gonna have to wait.

 

[drf256]