Rather than start a new thread, I want to ask some things in here as it seems there's a ton of knowledge gathered in this one place. Does anyone want to share their experience with port timing that produced a saw that cuts and bucks like it knows the job? I know, the 372 is already a beast, but my 2163 BB Jonsered put her to shame and I found unrealistic squish, so I was going in no matter what. I have my 268/670 Meteor piston. The windows have been de-burred, and the .040 popup machined. I did some checks on both pistons and came up with the following...
Original Piston with NO base gasket:
Squish: .058
Int: 72 - 144 duration
Exh: 101 - 158 duration
Trans: 129 - 102 duration
Case Comp: 57 duration
Blow Down: 28 duration
New Machined Piston with Base Gasket:
Squish: .025
Int: 82 - 164 duration
Exh: 104 - 152 duration
Trans: 130 - 100 duration
Case Comp: 52 duration
Blow Down: 26 duration
I've read this thread. Lots to digest and I get lost in the side stories and different builds. I'm trying to target a good runner with what I have. No port work has been done to the head yet, but that's next. There will be a muffler mod when my "beater muffler" gets here. I'll be case matching, lots of exhaust work, cleaning up the transfers, widening the ports (while leaving a minimum of 2mm around the skirt), Most likely blending the transfers toward intake as well.
There are lots of builds from more members than I can remember in the 128 threads I've bookmarked, but people seldom share their numbers. I may be interested in jumping up to the 395xp carb if the need comes up, but I believe the stock HD-12B should be enough to pump a lighter 50mm with some gumption. Sorry if this is coming off rude or typical, but I've never degree'd a saw let alone to this extent, and if it wasn't in pieces all over the bench, I'd probably not be asking. I've read and read until my wife started telling me to lay down the laptop and my eyes started wiggling. So much trial and error here that I just had to ask. I understand, every one is different, but there's a strong work horse out there somewhere, and I'm trying to find a good set of timing numbers without going back to school. If someone can point me in the right direction, I'd really appreciate it! Thanks, Mike.