ENGINE 4 A JETBOAT

wow 7k in a jet boat is a bit high. Race boat or lake boat? Whos pump is in the boat and its set up?

Yeah, trust me, you don't want to spin a stock pump that fast.........been there, done that.....it tends to make the impellers....shall we say, disassociated......
Rob

SO INFO PLEASE

500hp is about 5500 rpm on a "A" impeller on a budget you can spend your money on the heads or a stroker kit, either way you should be able to get 500 hp pretty easy at 5500-6000 rpm. We just need to know what ya got now and what you want to spend so we could help to get you to your goal.

7,000 RPM = BROKEN STOCK ROD.

Lem Evans said:

7,000 RPM = BROKEN STOCK ROD.

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Do you really think that? Ha ha ha, jk

Lem Evans said:

7,000 RPM = BROKEN STOCK ROD.

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Lem you know that's just the beginning Did you mean rods.

G -

OK SO MAYBE I SHOULD BUILD MY JET FIRST LOL GOOD INFO G CODE SO WHT SHOULD I DO WITH MY ENGINE TO RUN ATTHAT RANGE

SABRE JET said:

OK SO MAYBE I SHOULD BUILD MY JET FIRST LOL GOOD INFO G CODE SO WHT SHOULD I DO WITH MY ENGINE TO RUN ATTHAT RANGE

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I'd tell ya what I'd do but I might get accused of spreading misinformation again

I just wouldn't know what to do with myself if that happened twice in the same day. LOL



What heads and how much budget do you have to work with ? That's where you need to start.

G-

D3VE HEADS AND I HAVE ABOUT 2,500 BUCKS

SABRE JET said:

D3VE HEADS AND I HAVE ABOUT 2,500 BUCKS

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Get someone who knows what they're doing port the heads and set them up for you ( bigger valves etc) . Get the best cam you can afford. I've heard good things here and on the other site about the Torker II intake for that RPM range.

Approx 10:1 compression, ported heads around the 300+ cfm number at .550-.600 range a ported intake like the Torker II, the right cam and an 850 dp and you'll be in business.

Not sure on your budget what you'll be able to do

G-

SABRE JET said:

D3VE HEADS AND I HAVE ABOUT 2,500 BUCKS

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Please turn off the caps lock. All caps mean you are yelling.

SABRE JET said:

SO I'M LOOKING TO MAKE A SOMEWHAT OF A BUDGET BUILD 4 MY 18FT JETBOAT. I WOULD LIKE TO USE THE STOCK HEADS 4 NOW AND I WOULD LIKE TO KNOW WHAT IT WOULD TAKE TO GET A 460 TO SPIN 7000 RPM AND MAKE AROUND 500 HP ON PUMP GAS.

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We've done a lot of OEM block/head 460 jet boat engines, typically 450-600 hp for the OEM iron headed versions. You do not need to spin these engines to 7000 rpm in order to make 500 hp. Is there is a specific reason for the higher-than-usual rpm range?

$2500 is not normally enough of a budget to build a 500 hp 460 jetboat engine , but if you have a running jet boat with a 460 engine in great shape and want to improve it's power output then $2500 can do a lot for you.

Paul

G-Code said:

Get someone who knows what they're doing port the heads and set them up for you ( bigger valves etc) . Get the best cam you can afford. I've heard good things here and on the other site about the Torker II intake for that RPM range.

Approx 10:1 compression, ported heads around the 300+ cfm number at .550-.600 range a ported intake like the Torker II, the right cam and an 850 dp and you'll be in business.

Not sure on your budget what you'll be able to do

G-

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This is definately down the correct path here, lol.

rmcomprandy said:

This is definately down the correct path here, lol.

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I get lucky every now and then

G-

Morning guys,

I don't have any jet boat experience (a little prop time), but im looking at them. How different is the engine set-up and build for a jet drive?

Thanks
Jason

Depends on the prop...stern drive or Vdrive.