Firstly, hello all. I've been an iBoats creeper for years but just recently joined up. I figured I'd give a little info on my current project. It is a mid to late 90's Maxum 2000sc with a balance shaft 4.3. Since I will have a new motor and exhaust setup already, I opted to go for a freshwater cooling system (run boat on the river anytime of year). I have the appropriate crank mounted Johnson sea water pump but I stared wondering about the water pickup options.
Most people would say just do a thru hull or transom pickup and I was leaning towards a bobsmachine transom pickup and a strainer but I started wondering...could you remove just the impeller from an Alpha 1 (gen I or II) and use the existing lower leg pickup for the sea water pump similar to the Bravo units? After looking at it I don't see why this couldn't work even if I needed to mod the inlet holes a bit. Has anyone ever done this or known someone who did?
Also, the boat was originally equipped with an Alpha 1 Gen II but currently has a Gen I unit on it (I know lol). I'm going to replace it with a 1.6x ratio unit more than likely. I got the boat for free so when the 4.3 spun a main bearing during the "testing" phase I didn't hesitate to pull and build it. I wanted v8 type power but better fuel economy for cruise so I did the following for anyone interested:
-block .030" over
-Proper quench distance/area attained by: a.)block deck .005" piston in hole b.) .040" Cometic gaskets c.) KB 12cc dished pistons (quench area matches Vortec chamber)
-ARP fasteners on rods/mains/heads
-Vortec heads with stainless valves (2.02" intake and stock sized exhaust), appropriate radius and valve job, milled to ~61cc, port matched to intake mani
-Comp beehive 918 springs and appropriate retainers (heads machined for them and over .500" lift cam)
-ARP 3/8" threaded rocker studs (my heads had the M10 sized threaded holes)
-Went with an Erson cam grind after talking to their guy and learning about the lobe profiles they use (flame suit ready as 99% of people here are going to tell me my motor is going to suck water etc. etc.)
specs: Duration ADV - IN 282*/EX 286* @.050" 214*/218* Lift .480"/.510" Lobe Center 112* w/4*adv.
-Comp 1617-12 Ultra Pro Magnum 1.52 roller rockers (self aligning)
-.080" wall pushrods
-melling stock pressure/volume oil pump
-lighter weight timing set
-Performer 2114 intake with 1409 carb (1485 jet kit installed with a full jet kit to dial it in on water) and heat soak preventive gasket
-Sierra 18-7232 hi perf. flame arrestor
-Marine Power high flow exhaust manifolds with 3" riser spacers to provide some addition distance to combat possible reversion
-newer style y pipe with better flappers and longer pipe elbows (cobra headed looking type) for the 3" riser spacers
-exhaust tube vs bellows
-Thunderbolt IV with Moore Performance E-core coil and using .060" plug gap
-Mercury Remote oil filter kit (because it makes life easier lol)
-new circulating pump
Thanks,
Kp
Most people would say just do a thru hull or transom pickup and I was leaning towards a bobsmachine transom pickup and a strainer but I started wondering...could you remove just the impeller from an Alpha 1 (gen I or II) and use the existing lower leg pickup for the sea water pump similar to the Bravo units? After looking at it I don't see why this couldn't work even if I needed to mod the inlet holes a bit. Has anyone ever done this or known someone who did?
Also, the boat was originally equipped with an Alpha 1 Gen II but currently has a Gen I unit on it (I know lol). I'm going to replace it with a 1.6x ratio unit more than likely. I got the boat for free so when the 4.3 spun a main bearing during the "testing" phase I didn't hesitate to pull and build it. I wanted v8 type power but better fuel economy for cruise so I did the following for anyone interested:
-block .030" over
-Proper quench distance/area attained by: a.)block deck .005" piston in hole b.) .040" Cometic gaskets c.) KB 12cc dished pistons (quench area matches Vortec chamber)
-ARP fasteners on rods/mains/heads
-Vortec heads with stainless valves (2.02" intake and stock sized exhaust), appropriate radius and valve job, milled to ~61cc, port matched to intake mani
-Comp beehive 918 springs and appropriate retainers (heads machined for them and over .500" lift cam)
-ARP 3/8" threaded rocker studs (my heads had the M10 sized threaded holes)
-Went with an Erson cam grind after talking to their guy and learning about the lobe profiles they use (flame suit ready as 99% of people here are going to tell me my motor is going to suck water etc. etc.)
specs: Duration ADV - IN 282*/EX 286* @.050" 214*/218* Lift .480"/.510" Lobe Center 112* w/4*adv.
-Comp 1617-12 Ultra Pro Magnum 1.52 roller rockers (self aligning)
-.080" wall pushrods
-melling stock pressure/volume oil pump
-lighter weight timing set
-Performer 2114 intake with 1409 carb (1485 jet kit installed with a full jet kit to dial it in on water) and heat soak preventive gasket
-Sierra 18-7232 hi perf. flame arrestor
-Marine Power high flow exhaust manifolds with 3" riser spacers to provide some addition distance to combat possible reversion
-newer style y pipe with better flappers and longer pipe elbows (cobra headed looking type) for the 3" riser spacers
-exhaust tube vs bellows
-Thunderbolt IV with Moore Performance E-core coil and using .060" plug gap
-Mercury Remote oil filter kit (because it makes life easier lol)
-new circulating pump
Thanks,
Kp