tuantom
04-18-2007, 12:24 PM
How big can you really go before reversion becomes an issue?
I read Beech2000's post stating that his guys said his cam had too much overlap and would be problematic - I think it was @ .050" in/ex 218/224 112 LSA. I just installed a bit smaller cam - 212/218 112 LSA - but one that is close enough to his to raise an eyebrow.
What other factors contribute to - and by how much - exhaust reversion. Are some manifolds better than others? Height above water-line? Thru-hull vs thru drive?
I'm currently running the old Mercruiser style logs, a volvo drive, and thru-hull trumpets; but they are from the late 70's and probably approaching their end, so I am contemplating a change to center rise manifolds. Would this contribute to or reduce the possibility of reversion. After spending so much time and money on my engine, I'd hate to introduce a major flaw. A couple more ponies isn't worth it.
Thanks
I read Beech2000's post stating that his guys said his cam had too much overlap and would be problematic - I think it was @ .050" in/ex 218/224 112 LSA. I just installed a bit smaller cam - 212/218 112 LSA - but one that is close enough to his to raise an eyebrow.
What other factors contribute to - and by how much - exhaust reversion. Are some manifolds better than others? Height above water-line? Thru-hull vs thru drive?
I'm currently running the old Mercruiser style logs, a volvo drive, and thru-hull trumpets; but they are from the late 70's and probably approaching their end, so I am contemplating a change to center rise manifolds. Would this contribute to or reduce the possibility of reversion. After spending so much time and money on my engine, I'd hate to introduce a major flaw. A couple more ponies isn't worth it.
Thanks