Jet Drive

[CMP]

Hi folks,

I have a brand new Jacuzzi Brothers 12JY jet drive still in it's packing material for sale. Why pay $3,500 for a jet drive assembly when you can have this never installed but 25 year old unit for far less. Jets haven't changed much over the years-all they are is a high volume pump and nozzle system. The Jacuzzi Brothers were the original and North American Marine Jet bought their patents and has repair parts for this unit, which can accommodate up to 500 HP. If you're replacing an outdrive or building new and want to improve your bottom line, please email me mpoirier@nhprecision.com and we can talk...

CMP

[keepengyew]

Dear CMP,

Would like to know how much you want for this unit.

Regards,

Kee from Malaysia

[rrunamuk11]

i have a 1977 challenger jet boat, and i need to replace my jet drive. i think urs will fit but im not sure. im kinda new to the jet boatin world so any help i can get would be appreciated. what is the price on ur pump? please email back

[Dan Vaughn]

Hi folks,

I have a brand new Jacuzzi Brothers 12JY jet drive still in it's packing material for sale. Why pay $3,500 for a jet drive assembly when you can have this never installed but 25 year old unit for far less. Jets haven't changed much over the years-all they are is a high volume pump and nozzle system. The Jacuzzi Brothers were the original and North American Marine Jet bought their patents and has repair parts for this unit, which can accommodate up to 500 HP. If you're replacing an outdrive or building new and want to improve your bottom line, please email me mpoirier@nhprecision.com and we can talk...

CMP

We have a 1973 Signa with a 12YJ Jacuzzi jet. Will your jet work for our boat and is it complete? What is the cost of the assembly plus the shipping to Gas City, Indiana, 46933, and how long would it take for us to receive it.

Dan Vaughn
danv@comteck.com

[stuart]

i have a 1977 challenger jet boat, and i need to replace my jet drive. i think urs will fit but im not sure. im kinda new to the jet boatin world so any help i can get would be appreciated. what is the price on ur pump? please email back


i have two complete berkeley pumps one from 302 ford the other from 455 olds if the will help?

[ARS Marine inc.]

i have two complete berkeley pumps one from 302 ford the other from 455 olds if the will help?


??JE/JF OR JC/JG??

What model ??

How Much$$

[diver]

looking for a pp 90 duct part number 90-401. ours seems to have suffered some damage and has bee n deformed.
richard

[phil959]

can anyone help me find an impeller for pp90 jet 213 pitch to suit 2500 revs phillip

[diver]

unit ID. Vosper J0250501/A.
Address
French Marine Motors ltd. 61/65 Waterside. Brightlingsea. Essex. C07 0AX. TEL: 01206 302133/305601,
contact Mike French

[Arrowmarine]

I would be interested in any berkely pumps that may be available if no one ahead of me wants them.
Joey

[phil959]

does anyone know anything about cavitation,how to stop it ect,think my pp90 jet might be sufering from it,do you think the intake grill may cause it? phillip

[cyclops]

Before you get too technical. Have you very carefully cleaned out ANY scraps of anything in the drive? Checked and straightned or repaired the intake grates? Measured the impellor clearences? Is the impellor positioned correctly? Checked impellor runout or the amount of wobble it has? Bearing wear? If all that is O K. I can't help you.

[jetboatjill]

Can someone please tell me - on the exhaust pipes (that are half way down the back of the boat) on a jet boat, is the outer flap supposed to be so loose that it flops around in the breeze? AND where does the rubber gasket go that keeps the water out of the exhaust pipes while launching the boat? We've been trying to find a diagram of the inside & outside of the exhaust pipes for a 1971 Sidewinder jet boat. Are the pipes just straight, open pipes until the flap attaches at the end or is there something internally like a rubber gasket that needs to be inside the pipe? When we launch our boat, the exhaust pipes are below the water line and water rushes in the exhaust pipes not allowing us to launch the boat - however, the boat will not lift off the trailer either. Is the engine too heavy for the boat? Cyclops has already been tremendous help! THANKS a BUNCH!!!! jetboatjill & johnnyjetboat

[phil959]

can any one help i have mi 21 deep v with pp 90 jet i have 180 hp diesel 2500 revs matched to new impeller and new werering .but stil only get 15 knots the same as before with lesser pitched impeller and about 2 mm gap.i went to look at the same boat as mine the owner claims 32 knots ,i have no reason to disbeleive him.he had 160 hp diesel at 2500 revs and the same impeller as mine .the only difference i saw was his engine was about one metre nr the sturn and the fuel tanks were just behind the cabin and mine is in cabin 20 gollons.do you think the weight being ferther back will make all this difference twice the speed! hope someone can help me phillip

[cyclops]

If you can not lift the bow, it will not plane. Can you get "speedy" to run along side of you as you speed up to your maximum speed? Look at each boats riding angle. Is his bow higher? Take EVERYTHING out of the bow area that you can and put it in the back of the boat for a test run. You may have to put a person, 100# in the back to lift the bow. Keep shifting weight till the bow lifts the boat.

[phil959]

can anyone tell me if i reduce the size of the nozzle will this inprove poformence on a pp90 jet nozzle is 6inch dia this looks to be quite big for a 9 inch impeller.i see hammilton jets look quite a bit smaller that is looking at pics.and thanks cyclops for your help. phillip

[jetboatjill]

Phillip,
Cyclops is tremendous help & extremely knowledgable! He helped us get our jet boat up & running! Let me talk to johnnyjetboat (my main squeeze) and we'll get back w/ you ASAP.......but for now, take Cyclops' advise! :-) jetboatjill

[cyclops]

Just to give you a idea how critical front to rear weight is on speed. I have a 18.5' bow rider 8' wide 3400# 250hp 5.0L . 2 people in mid boat it needs full trim in to get up on plane. Then trim out as speed increases. ORRRR. 1 person, 150# at the point of the bow and it needs no trim in to plane. Boats are on water, Not roads. You HAVE to experiment with weight and trim to live with what you have. ORR. Get the help of a winner in a racing boat similar in size and shape to what you have and let him test it and show you how to do it. ORRR. Tell you what is wrong and how to fix the problem. --------Note, my boat can not plane with 5 people in the rear. NO WAY, NO HOW. TOO much weight back there.

[Big-A]

what kind of jet system can i hook up to a 1979 dogde 440

[phil959]

can anyone help i had 200 hp diesel driving pp 90 jet at 2500 revs with the steepest pitch impeller only got 15 knotts i have now got 165 hp at 3600 reves a much lighter engine but now prop is to big and only rev at 2400 but i still do 15 knotts if i buy the right impeller to let engine rev at max 3600 revs do you think this will improve my speed .i have 21 foot deep v hull it will do 40 knotts with 225 outboard.hope sombody can help
regards phillip

[brian eiland]

can anyone help i had 200 hp diesel driving pp 90 jet at 2500 revs with the steepest pitch impeller only got 15 knotts i have now got 165 hp at 3600 reves a much lighter engine but now prop is to big and only rev at 2400 but i still do 15 knotts if i buy the right impeller to let engine rev at max 3600 revs do you think this will improve my speed .i have 21 foot deep v hull it will do 40 knotts with 225 outboard.hope sombody can help
regards phillip
I don't claim to be any kind of an expert in this subject, but I am presently looking at the jet powered subject for another RIB application. I have noticed some references to problems with proper intake of fluids when the jet unit is mounted in a 'deep V' hull form. Do you know the deadrise angle of your hull at the inlet location??