Jeepers
Member
pros and cons on flipping a marine motor from a rocker arm valve train to a roller rocker system?
rolling/rocking
- Thread starter Jeepers
- Start date
- Oct 6, 2006
- 12,155
- Boat Info
- 1996 450DA
- Engines
- 3116 Caterpillars
pro-------lower rotating resistance
cons-----cost
Roller rockers are cool additions where you need to eeek out the last bit of performance, but I really question their value on a boat that tops out at 4200-4400 rpm. The lower resistance probable gives you a little better economy, but I doubt 1/100's of a GPH is measurable or particularly meaningful.
If we were talking about a 6500-7000 rpm small block screamer with a radical camshaft, probably so.
Maybe someone else has a different take on them............
cons-----cost
Roller rockers are cool additions where you need to eeek out the last bit of performance, but I really question their value on a boat that tops out at 4200-4400 rpm. The lower resistance probable gives you a little better economy, but I doubt 1/100's of a GPH is measurable or particularly meaningful.
If we were talking about a 6500-7000 rpm small block screamer with a radical camshaft, probably so.
Maybe someone else has a different take on them............
Torque
Member
Agreed, Natural fit if you were doing cam, heads with higher spring pressure, etc. Otherwise, unless you had to replace one for some reason, I'd leave them alone.
Stickwith the stock set-up, unless you were building a performance engine. A rollervalve train reduces friction and adds precision movements to the valve trainthey also help eliminate valve floating at higher RPM’s. If you’re going to adda roller valve train you need to change out the valve springs and retainers because of the added spring pressure. Dependingon the wear and tear (hours on the engine) you may also want to look at thevalve stems because any wear on the stems would also need to be addressed. I just don’t see the return for your investmentespecially since this doesn’t appear to be some type of performance boat, Savethe cash for something else
