STEEL Coupler VS ALUMINUM Coupler
#1
STEEL Coupler VS ALUMINUM Coupler
Getting ready to install 572 CI 700 HP ...700 TQ engines in boat.... Need couplers and Im getting mixed stories about which couplers to use. Some say aluminum some say steel. Any feedback or advice would help. Thanks in advance....
#4
Platinum Member
Platinum Member
iTrader: (1)
No question steel, buy the 575 sc steel couplers with long snouts, I have been running the same one approaching 400 hours behind 750-1115 hp in my Baja and it still looks close to new. My original aluminum one on the other hand, the splines were 1/2 gone after running 650-750 hp for around 100 hours, Smitty
#5
Registered
My 700HP, 575SCi aluminum couplers look new at 320 hours.
Well, until the drive locked up on the forward engine. The drive input splines were twisted and the stubshaft that goes into the coupler was in 3 pieces. The splines were still fine but the hub wasn't straight anymore.
So much for a "weak link".
Well, until the drive locked up on the forward engine. The drive input splines were twisted and the stubshaft that goes into the coupler was in 3 pieces. The splines were still fine but the hub wasn't straight anymore.
So much for a "weak link".
#6
Platinum Member
Platinum Member
iTrader: (1)
My 700HP, 575SCi aluminum couplers look new at 320 hours.
Well, until the drive locked up on the forward engine. The drive input splines were twisted and the stubshaft that goes into the coupler was in 3 pieces. The splines were still fine but the hub wasn't straight anymore.
So much for a "weak link".
Well, until the drive locked up on the forward engine. The drive input splines were twisted and the stubshaft that goes into the coupler was in 3 pieces. The splines were still fine but the hub wasn't straight anymore.
So much for a "weak link".
Last edited by articfriends; 03-01-2012 at 04:42 PM.
#9
Charter Member # 55
Charter Member
Never seen a 575 sci "aluminum" coupler as the ones everyone buys that are heavy duty ARE the 575 sci long snout steel couplers, were yours originally aluminum or something you put on your boat? I see on your info your boat was a 2002? Looking thru some stuff it seems they upgraded the couplers at one point for the 575's around 03-04, maybe makes sense why yours were aluminum.
You can get steel couplers with the long snout or no snout at all.