MillerModSaws and the PS-7910

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20150219_162507.jpg 20150219_163258.jpg All assemble with initial tune. I made a double d wrench to fit this carb I think it's gonna work pretty slick. I think it will stay right were it's at so I can tune in the cut. But i also slotted the end of the needle so who ever buys this won't haft to have the wrench.
 
View attachment 404808 And here's a pic I will prob catch crap over. I am the first to admit I have a lot to learn but here I know the air and gas mix is in a gas form not a liquid but I like to run them under the faucet to try to understand how the trans are flowing. This one in particular the exhaust side trans I may pull the the edge closet to the exhaust a little more straight out on the next build. But like I said this is more me learning how each cylinder flows. And the directions my port work is aiming. On the port you see flowing. Both sides were head towards the intake when I started and you can see how I pulled the middle of the port around just a bit towards the center of the piston.
Ive been doing it too. What the goal of flow here, forcing the charge back towards the intake, laterally across port to collide with each other, or towards the exhaust port?

Does anyone do any assymetric work on the ports so the the flow is in different directions to compliment each other?
 
Ive been doing it too. What the goal of flow here, forcing the charge back towards the intake, laterally across port to collide with each other, or towards the exhaust port?

Does anyone do any assymetric work on the ports so the the flow is in different directions to compliment each other?
Yes...
Husqvarna does it on the 372 from the factory..
:innocent:
 
Ive been doing it too. What the goal of flow here, forcing the charge back towards the intake, laterally across port to collide with each other, or towards the exhaust port?

Does anyone do any assymetric work on the ports so the the flow is in different directions to compliment each other?

Don't forget that in addition to efficient chamber filling, the transfers through directing the intake charge are used to "sweep out" the combustion gasses. Remove certain symmetric flow and you will have problems.

 
I've let the saw run now for about five minutes while tuning Yada yada. Let cool and I'm pulling about 180 comp. I was hoping for just a bit more.
 

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