- Local time
- 7:08 PM
- User ID
- 21
- Joined
- Dec 4, 2015
- Messages
- 5,242
- Reaction score
- 28,061
- Location
- In a meeting
I see it the sameOpening up the fingers that far before the mains is causing the transfers to stall. The mix coming in from the fingers will eventually get reversed by the mains. That's why you have carbon across the majority of the piston, the fresh charge is just sitting there.
How I've always thought of fingers is that they should accelerate the main transfer flow up the intake wall, therefor you want them to open right before the charge front of the mains hits the intake wall. Then the steeper entrance angle of the fingers or boost ports will initiate the loop scavenging faster than just normal transfers yielding more power at higher RPM.
I see it the same
Ex was 100, now 96.5
The fingers opened at 117
then the ex side main at 118 and then the int side at 119
So they do open just before the charge from the uppers. In addition, they have far less cross sectional area than the mains do. They may have more velocity, but much less volume.
I personally see the ex pressure being too high and stalling flow, the fingers having the pressure to temporarily overcome that, then the mains not having time to do their jobs. Thats why i raised the Exhaust roof.
I think Shaun meant fingers open after the mains, timed to open just as the charge from the mains is getting to the intake wall. Then the fingers push that charge up and sweep the chamber. Obviously this would be at target rpm.
Looks to me like Angelo pushes that bar through Oak as if it were Pine!
.
Put a bar on that thing!
Jim: I was running my 660 with that 20" bar and chain. Doc brought me the saw and said throw a bar on it. So my easiest fix and comparison was to just switch my 660 bar to that China conglomeration. lolPut a bar on that thing!
I never assumed anyone reached past a long bar for a short one and I hope it didn't come across that way. It was general curiosity that motivated the comment.Jim: I was running my 660 with that 20" bar and chain. Doc brought me the saw and said throw a bar on it. So my easiest fix and comparison was to just switch my 660 bar to that China conglomeration. lol
The chain was super sharp, albeit it only 20". lol
BUT IT WILL CUT! And Mike's saw ran super strong.