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Messages - CobraJet454

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Jet Pumps / Re: Loader Help

« on: June 23, 2022, 09:52:44 PM »

Okay so I am shopping tonight more questions for you! Buying the Manuel floor mount place diverted machined for inserts. My questions are should I buy the place diverted droop or the berkley droop? Also is the bolt on place diverted ride plate worth it?

Jet Pumps / Re: Loader Help

« on: June 20, 2022, 07:32:25 AM »

Pump is not unloading or cavitation. It planes fast and pulls hard and quick. Runs flawlessly, but of course i want to see if I can go faster now. Did not know if I could pick up more from a more aggressive loader or not. I was told you can see how well your loader is working by the pressure on you water guage in the intake manifold, is that true? When I have my foot in it hard she is pushing 35psi.

Jet Pumps / Loader Help

« on: June 19, 2022, 09:30:13 PM »

Trying to decide which loader to try next to see if I pick anything up. Boat is a 1972 18ft cobra jet 500 HP 454 with berk 12JG. Pump has old jetovator, 4 degree wedge, aluminum B impeller, SE sport loader. With Accurate GPS it will do 70 MPH. I am looking at either trying The SS loader or maybe even the more aggressive one. Do any of you more experienced jet boater think I will have any gains or am I going in the right direction? When the fund approve I will install a stuffer and inducer and see how the boat performance if I want more I will buy a place diverted so I can run a nozzle insert and droop.

Engine Mechanical / Electrical / 454 Tunnel ram

« on: July 30, 2021, 11:05:46 PM »

My first tunnel ram engine need help figuring out what size carbs to run Running a mild 454
9:1 CP
049 larger ovals basic port work 3 angle valve job
Hydraulic cam 540 lift 114 LBS 236 248 D @ .050
Howard roller rockers 1.7 ratio
Msd ignition with 6al box
Over transom bassets
Weiand High-rise tunnel ram
2 600cfm carter afb competition carbs
8psi mechanical fuel pump.
I seem to lean out on the top end with current set up.

Jet Pumps / Re: More out of pump

« on: July 30, 2021, 10:52:03 PM »

The Rpm change could have been my right foot then. I have not repositioned the seat since I bought it and have to really twist my foot to get wide open. But wide open on throttle is wide open on the carbs, checked that.
I will definitely have to get a straight edge on the bottom of boat and see how that loader is positioned.
I am new to jet boat but from what I was told from another boater is a Jetavator is a place diverted but what they call "old style" i have a floor mount to adjust the angle of the nozzle. He saud the Jetavator is a brand specific place diverted made only for berkley jets. Truth to that who knows..
Yes, aluminum impellar but I do not know what brand or if anything has been done to if. I would assume is a Virgin B. Boat loads quick and gets up to speed quickly.

Jet Pumps / More out of pump

« on: July 29, 2021, 05:42:37 PM »

Just bought a 18ft semi V boat the other day and finally got the mpg. It is a 12jg berkley with B impellar, 4 degrees wedge and jetavator with se loader. With 3 grown men, ice chest and 20 gallons of fuel in the tank (tank in the bow of boat) I gps it at 62mph it had a little left but not much. But I pulled 5800rpm and then 6000rpm after losing passengers but didn't get a GPS reading that time. My question is should I try out an A or AB impellar or go with a ss loader to see were that gets me before I spend the money on a impellar. I want to GPS 70mph.
Motor was just assembled mild 454
9:1 CP
540 lift 238 248 D @ .050 114 LBSP
049 larger ovals small port work 3 angle valve job
Weiand high rise tunnel ram with 2 600 carter competition
Howard roller rockers 1.7 ratio
Msd ignition with 6AL box
Cam operation rpm is 3000 to 6000.

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