Recent Posts

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21
Jet Pumps / Re: More out of pump
« Last post by Jered503 on July 30, 2021, 10:59:43 PM »
Pictures of your boat and pump set up?


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22
Jet Pumps / Re: More out of pump
« Last post by CobraJet454 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.
23
Engine Mechanical / Electrical / Re: LS Cooling Setup
« Last post by jaycetti on July 30, 2021, 04:14:39 PM »
I appreciate the response.  I've actually read that post.  Again, it references using something like the LSX Adapters and not running any kind of thermostat setup.  I'm more or less hoping that I'll get some info from someone that has ran the Hardin Marine thermostat setup and thinks it's worth it's cost.
24
Engine Mechanical / Electrical / Re: LS Cooling Setup
« Last post by TrollerDave on July 30, 2021, 04:00:50 PM »
Welcome to SCJB. Those are good boats. Here is a thread about plumbing just for reference.

http://www.socaljetboats.com/engine-mechanical-electrical/plumbing-help-needed-for-ls-motor-install/msg345564/#msg345564
The topic of tstats has been discussed a lot with older style engines. Usually, boat motors are built with extra clearances because of running at higher rpms and the difference in running temps because of open cooling (no tstat).


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25
Engine Mechanical / Electrical / LS Cooling Setup
« Last post by jaycetti on July 30, 2021, 03:38:36 PM »
Just picked up my first float!  77 Hallett Mini Cruiser.  I've built many customer cars and trucks but never a boat.  I'm going for nice reliable family cruiser, not a rocket on the water, so I'm dropping in a mild built carbureted LQ9 6.0L.  My questions are concerning the cooling setup....

I've been trolling around and it looks like many of the guys going LS are using the LSX Adapters and skipping any type of thermostat. 



Then if you go on Hardin Marine you come across this expensive coolant crossover thermostat. 



I'm going wet exhaust through transom, so I'm just unsure which is the best option and why one works better over the other.  My past experience with cars tells me the thermostat setup will help the engine come up to temperature faster and cause less stress on the engine.  If that's the only real benefit of going thermostat then I'm unsure if it's really necessary.  Any advise would be greatly appreciated.  I'm also going to have many future questions regarding other systems, so I'm sure you'll be seeing more topics from me in the future.  And, I can't wait to get the boat out there and meet up with you guys!  Looks like a great group.  Pics below of my new purchase....

26
Boats For Sale / Re: 1987 21 DAYTONA
« Last post by Faust17 on July 30, 2021, 12:59:05 PM »
No Money Spared
Pro Built DNE MOTOR SPORTS 1471 BLOWER ALL BEAT PARTS JETAWAY ETC!!!
HAS RAN 116 BUT ALOT MORE THERE PUMP GAS

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Still for sale ? I pmd you
27
The No Wake Zone / Re: There is still HOPE
« Last post by FordLover on July 30, 2021, 10:39:06 AM »
Lol, that is funny

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28
Jet Pumps / Re: More out of pump
« Last post by Flusher on July 30, 2021, 09:25:02 AM »


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.

Pictures of the boat, from the side, while making a pass would help.  When you are doing your testing, try to keep everything consistent.  Lose all the ice chest, passengers, and unnecessary weight.  Keeping the fuel level constant would also make things easier for you.

Your RPM should not change with different weights in the boat.  The only way the RPM will change is with cavitation or by sucking air (pseudo cavitation).

I'm assuming you have an aluminum impeller.  It sounds like the impeller is right where it is supposed to be, compared to your cam RPM range, assuming that there are no underlying issues loading your pump (slipping the impeller).

If the trailing edges of your impeller are "properly" detailed, it will drop your RPM by about 300 and your MPH might pick up.  But then again, your RPM might not be reaching peak horsepower.

I would start with a 2nd 4-degree wedge, getting your trim and attitude sorted out.  The two wedges can be 'clocked' to adjust the nozzle angle.  You didn't mention a Place Diverter.  If you were feeling spendy, it's worth it because you will ultimately end up with one anyway.  Although, you can still test with wedges.

Take a straight edge under your boat, holding it flush with the keel.  Check to see if your loader ramps are hanging below keel.  You didn't mention a shoe, so more aggressive loader ramps might be necessary to keep the pump loaded, at the cost of drag.  Maybe, shorter loader ramps could help you achieve greater MPH.  Try to hook up with some friends who might let you borrow a different loader for testing.

Lastly, make sure that you are actually getting full-throttle, because it happens.

There is a lot you can do with just adjusting hardware.

Cheers,

Joe
29
Jet Pumps / More out of pump
« Last post by CobraJet454 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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