Jmssaws ms460

[paragonbuilder]

It's here,now what do I do?

Drill a hole in the mufflers,say they are ported, and sell them! [emoji23]

 

[paragonbuilder]

I'm getting better......but slowly. Yep, still just me.

Glad to hear that.
Do you like working alone better?

 

[malk315]

View attachment 22279

Got a dyno graph for that 460 I believe and it said stock stihl numbers. 6hp at 9500 or something like that. Will have to get it on the dyno after it will be the first before/after specimen.

Sent from my XT1080 using Tapatalk

 

[Mastermind]

Glad to hear that.
Do you like working alone better?

Yeah.......I get more done actually.

 

[paragonbuilder]

Yeah.......I get more done actually.

I get that. My wife is always trying to get me to have our families help on our renovations. Freaking old house everything is custom... They just get in the way....

 

[Keith Gandy]

It's here,now what do I do?

Hack on it!!! Lol

 

[jmssaws]

I'm gonna start drilling holes in stuff tomorrow morning.

 

[Mastermind]

I have an electric jack hammer. Wanna barrow it?

 

[jmssaws]

I have an electric jack hammer. Wanna barrow it?

Absolutely. I'll drill and beat holes in everything. This saw is going to be a beast!

 

[Mastermind]

Muh hero.

 

[Keith Gandy]

Jason I hear this works well on saws for porting also!!

 

[paragonbuilder]

Absolutely. I'll drill and beat holes in everything. This saw is going to be a beast!

Am I gonna be able to handle it? [emoji848]

 

[Keith Gandy]

Jason u may consider an assistant to do some of the muffler mods .

 

[paragonbuilder]

Jason u may consider an assistant to do some of the muffler mods .View attachment 22319

I know I wouldn't be getting anything done with her around...

 

[Mastermind]

Excuse me......

GGFF

 

[Keith Gandy]

I know I wouldn't be getting anything done with her around...

Not even new porting techniques ??!!

 

[drf256]

What your trying new is more blowdown?

I've went from building short blow down saws to building saws with 23 to 26 degrees.

I think with the increase in intake duration you can put the increased bd to good use.

Yeah.....spot on. Higher transfers need short intake duration to build case pressure. If not, exhaust pressure overcomes the transfer charge. I'm seeing some real power increases with longer blowdown in the quad port saws.



Being injured is making me feel old.

Teach me guys.

I'm seeing it opposite from reading Bell's Book. I likely have it backwards.

Smaller case and less intake duration SHOULD cause higher case pressure enabling one to run a physically lower transfer (numerically higher). More intake duration should cause less case pressure and subsequently the need for physically higher transfers.

You guys know way more than me, that's for sure. I see the back filling as being an issue.

When I read about it, the real world experiences were with dirt bikes and not saws, but piston ported 2-strokes nonetheless. Regardless of exhaust height, they found that smaller cases caused so much transfer pressure that it was pushing unburned mix out of the exhaust. They started lowering the uppers to stop that from occurring.

Sounds like the transfers should work wherever they are cut then. Too high and they'll back stuff till they are ready, too low and they'll make more pressure and do more. Why move them at all?

 

[paragonbuilder]

.
Sounds like the transfers should work wherever they are cut then. Too high and they'll back stuff till they are ready, too low and they'll make more pressure and do more. Why move them at all?

I've been wondering this as well?

 

[Keith Gandy]

Teach me guys.

I'm seeing it opposite from reading Bell's Book. I likely have it backwards.

Smaller case and less intake duration SHOULD cause higher case pressure enabling one to run a physically lower transfer (numerically higher). More intake duration should cause less case pressure and subsequently the need for physically higher transfers.

You guys know way more than me, that's for sure. I see the back filling as being an issue.

When I read about it, the real world experiences were with dirt bikes and not saws, but piston ported 2-strokes nonetheless. Regardless of exhaust height, they found that smaller cases caused so much transfer pressure that it was pushing unburned mix out of the exhaust. They started lowering the uppers to stop that from occurring.

Sounds like the transfers should work wherever they are cut then. Too high and they'll back stuff till they are ready, too low and they'll make more pressure and do more. Why move them at all?

Im lost! Wouldnt a longer intake fill the case until its greater than atmospheric psi then only result in spitback and especially if the transfers r smaller would even make it worse?

 

[mdavlee]

Teach me guys.

I'm seeing it opposite from reading Bell's Book. I likely have it backwards.

Smaller case and less intake duration SHOULD cause higher case pressure enabling one to run a physically lower transfer (numerically higher). More intake duration should cause less case pressure and subsequently the need for physically higher transfers.

You guys know way more than me, that's for sure. I see the back filling as being an issue.

When I read about it, the real world experiences were with dirt bikes and not saws, but piston ported 2-strokes nonetheless. Regardless of exhaust height, they found that smaller cases caused so much transfer pressure that it was pushing unburned mix out of the exhaust. They started lowering the uppers to stop that from occurring.

Sounds like the transfers should work wherever they are cut then. Too high and they'll back stuff till they are ready, too low and they'll make more pressure and do more. Why move them at all?

Moving them to raise the peak powerband if that's your goal. Some are just too low after machine work to gain compression.