Tree Monkey MS462 - PART 2

[tree monkey]

20%

 

[XP_Slinger]

It's interesting seeing how other guys do things. Each has his own methods of what works for him. And what works for one, often doesn't work for another

Yes sir it’s very interesting.

 

[dustinwilt68]

, good read.

 

[jacob j.]

With the single carb setup, JulieAnne doesn't get to play with the sex toys while you work on them though

View attachment 154095

That looks like one of those things that Astronauts go pee in at the International Space Station.

 

[tree monkey]

With the single carb setup, JulieAnne doesn't get to play with the sex toys while you work on them though

View attachment 154095

which hole is the anus?

 

[huskihl]

which hole is the anus?

Exactly

 

[Redfin]

the speed of the air has more to do with fuel delivery then volume.

Thats what I thought you were saying.

 

[Fruecrue]

yes by far, as long as the pipe is right for the porting and rpm

Me thinks it’s about time for another pipe theory thread, since you’ve been sharing tidbits and all...

 

[Redfin]

no, I didn't want to waste a cylinder for the test, there were no real differences in the timed cuts for me to go further with gutting them at this time.

You think there was anything left on the table having the charge only being able to mix in the boot before it hit the face of the split jug?

 

[tree monkey]

You think there was anything left on the table having the charge only being able to mix in the boot before it hit the face of the split jug?

I don't see how hogging that area out will improve flow without changing the port window. there's not much that can be done to that window.
we can give the strato port a longer duration by lowering the cylinder or raising the cutout in the piston, but we can't shorten the duration.

 

[Deets066]

I’d like to run a standard piston and purge the stratos straight out the exhaust. Just like boost ports except using air instead of fuel

 

[tree monkey]

Dood, Ive racked your brain in person. You think I wont hesitate online?

So... back to the carb. The volume of air (thinking of the divided strato carb) passing the jets really has no bearing on the amount of fuel delievered?

Edit: volume compared to an open venturi.

i'm assuming that half the volume of air entering the saw goes through the intake port and half the strato ports. I can't verify this.

lets say 75% of the air wet through the strato's, is 25% of the air enough flow, in the fuel side of the carb, to create the low pressure needed to deliver fuel correctly? most likely not.

so yes air flow could become a problem in the fuel side of the carb, but I don't think we can get to that point in porting.

 

[dustinwilt68]

I would think you don't have to reinvent the wheel here, Stihl spent a lot of money on R&D and they seem to make it pretty stout out of the box, I would think the largest gains will come from small changes, just my 2 cents, happy to be wrong.

 

[tree monkey]

I’d like to run a standard piston and purge the stratos straight out the exhaust. Just like boost ports except using air instead of fuel

it doesn't work that way

 

[tree monkey]

I would think you don't have to reinvent the wheel here, Stihl spent a lot of money on R&D and they seem to make it pretty stout out of the box, I would think the largest gains will come from small changes, just my 2 cents, happy to be wrong.

yes just improve a little here and there.

 

[Deets066]

it doesn't work that way

Lol, I know.
But it’d Be nice

 

[Deets066]

i'm assuming that half the volume of air entering the saw goes through the intake port and half the strato ports. I can't verify this.

lets say 75% of the air wet through the strato's, is 25% of the air enough flow, in the fuel side of the carb, to create the low pressure needed to deliver fuel correctly? most likely not.

so yes air flow could become a problem in the fuel side of the carb, but I don't think we can get to that point in porting.

You said it before, it’s not the volume of air goin through the carb that pulls fuel but the velocity of the flow

 

[tree monkey]

the carb is only going to flow a certain cfm, above and below the divider. my way of looking at this is, lets get as much through the fuel side as posable and then play with the strato's

 

[tree monkey]

67%

 

[tree monkey]

I’d like to run a standard piston and purge the stratos straight out the exhaust. Just like boost ports except using air instead of fuel

how much thought have you put into this?