Hi
sorry if this is a stupid question but sterndrives are somewhat new to me!
I have a SP-c drive that has holes at the end of the cavitation plate (top of raw water exhaust) on the leg - realised that they must be for an flapper valve
My engine (5.7l) is mid mounted and drives through a jack shaft to the stern drive. I am running HiTek stainless manifolds - the manifold risers are quite high and then run down to twin 4 inch exhaust tubes that run 1 metre or 3 feet to the stern drive exhaust -
just wondering if I need the flapper or is this height and length of exhaust sufficient when reversing?
http://www.ebay.com/itm/Volvo-Penta-Exhaust-Flapper-Valve-852644-/371355841128
sorry if this is a stupid question but sterndrives are somewhat new to me!
I have a SP-c drive that has holes at the end of the cavitation plate (top of raw water exhaust) on the leg - realised that they must be for an flapper valve
My engine (5.7l) is mid mounted and drives through a jack shaft to the stern drive. I am running HiTek stainless manifolds - the manifold risers are quite high and then run down to twin 4 inch exhaust tubes that run 1 metre or 3 feet to the stern drive exhaust -
just wondering if I need the flapper or is this height and length of exhaust sufficient when reversing?
http://www.ebay.com/itm/Volvo-Penta-Exhaust-Flapper-Valve-852644-/371355841128