Comp XE256H-10

I haven't brought this up because I didn't want to start WWII.......but this thread seems a good place to do it.

I have spoken with Oregon Cam A LOT on the phone since I have had them grind a few. Those guys have been in the business since the early 80s I believe, so they are far from stupid.

They tell me the exact opposite of what everything else says about lobe separation. They say that the wide LSA jacks up cylinder pressure, while the tighter LSA decreases it.

I can see on the one hand how the wider LAS would do that. When you grind on a 114 for instance, instead of a 108, you are reducing overlap. Overlap is the period when both valves are hangin open. So reducing overlap will generally make cylinder pressure go up.

It would be a good topic for discussion for sure. I "think" what "THEY" are trying to say is that all things equal and unchanged, a wider LAS will result in more cylinder pressure.

'Tis interestin' fo sho.