Need help with my pump

« **on:** February 07, 2016, 02:07:50 PM »

I'm new to owning a jet boat. It is a 1978 Taylor Jet Boat with a JF-A pump. I have a put a new Ford 460 board 30 over with 9.5 to 1 compression ratio, comp cam gross valve lift is a 530. Duration. 006. Tappet lift 280. Lobe separation is 110. I have put roller tip rockers 1.6 ratio on it, the boat runs 50mph at 5800 rpms with an A impeller. When I climb under the boat and look in to the intake the ladder scoop goes up into the intake along with the grate. I believe this is the wrong ladder scoop for it. Need some help with making this boat perform better. From what I understand, at the rpms the boat is running, I should be going 80 miles an hour. Thank you Ron. I will post pictures shortly

« **Reply #1 on:** February 07, 2016, 02:16:41 PM »

Here are some pictures from Ron h

« **Reply #2 on:** February 07, 2016, 02:28:50 PM »

How recent was the pump re-built? Hopefully someone else will chime in to help here

Drinking a cold coors light and learning about boats

« **Reply #3 on:** February 07, 2016, 02:39:08 PM »

I doubt the loader is the issue.

Pump sounds loose or the tachometer is off.

And 80mph? No.

« **Reply #4 on:** February 07, 2016, 03:20:56 PM »

That's a heavy boat and not near enough power to do 80 you might want to have the impeller cut down to a b that might get you a little faster but 80 in that boat that will never happen with that power plant

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« **Reply #5 on:** February 07, 2016, 03:29:25 PM »

Quote from: brian777 on February 07, 2016, 03:20:56 PM

That's a heavy boat and not near enough power to do 80 you might want to have the impeller cut down to a b that might get you a little faster but 80 in that boat that will never happen with that power plant

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What? So you want to see the engine turn over 6k?

I'm lost.

GT

« **Reply #6 on:** February 07, 2016, 03:30:32 PM »

I honestly don't think his tach is right

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« **Reply #7 on:** February 07, 2016, 03:34:24 PM »

Quote from: brian777 on February 07, 2016, 03:30:32 PM

I honestly don't think his tach is right

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Even still, a smaller cut impeller is an odd direction.

Not nearly enough information to make that call.

JMHO

GT

« **Reply #8 on:** February 07, 2016, 03:39:43 PM »

Maybe this will help

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« **Reply #9 on:** February 07, 2016, 03:44:40 PM »

Let me clarify I was told at 5800 rpms with an a cut and color I should be doing 80 I would like to see the engine only turning 4800 rpms at whatever speed a little better hole shot would be nice it seems like the pump is cavitating

« **Reply #10 on:** February 07, 2016, 03:45:21 PM »

I have a new a impeller for it what should the gap between the Impaler and I wear ring be

« **Reply #11 on:** February 07, 2016, 03:46:11 PM »

Quote from: brian777 on February 07, 2016, 03:39:43 PM

Maybe this will help

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Step one would be to gather more accurate information.

If the tach is incorrect, that would mean the information is worthless.

GT

« **Reply #12 on:** February 07, 2016, 03:50:07 PM »

Quote from: ron.h on February 07, 2016, 03:44:40 PM

Let me clarify I was told at 5800 rpms with an a cut and color I should be doing 80 I would like to see the engine only turning 4800 rpms at whatever speed a little better hole shot would be nice it seems like the pump is cavitating

Whoever said 80 is simply blowing smoke.

As for the gap, .022" to .026" is acceptable.

Pump is sounding very tired to me.

GT

« **Reply #13 on:** February 07, 2016, 03:53:28 PM »

I'm going to try to tear the pump down tomorrow I will take pictures and post them thank you

« **Reply #14 on:** February 07, 2016, 03:54:40 PM »

Ron H. for one thing you should register with you home town, so some one can guide you in the right direction, put in a new A impeller and wear ring, get the correct rocker arms 460 ford need 1.73 ratio, check you tach with a timing light that has a built in tach.

« **Reply #15 on:** February 08, 2016, 03:01:30 PM »

Heresy impeller and wear ring it has about .45 Clarence

« **Reply #16 on:** February 08, 2016, 03:02:03 PM »

Here is

« **Reply #17 on:** February 08, 2016, 03:04:50 PM »

Here is the pictures of the impeller and ladder scoop

« **Reply #18 on:** February 08, 2016, 03:31:26 PM »

Please don't take any offense.
80 is not going to happen with that set up. You don't have nearly enough power to get you there. That boat is heavy heavy.
Sweet looking ride there bud 👍🏻

Sent from McIntyre Park

« **Reply #19 on:** February 08, 2016, 04:52:26 PM »

Quote from: jyeager on February 08, 2016, 03:31:26 PM

Please don't take any offense.
80 is not going to happen with that set up. You don't have nearly enough power to get you there. That boat is heavy heavy.
Sweet looking ride there bud 👍🏻

Sent from McIntyre Park

This^^^

~500 hp, AA AMT Impeller, 5000 rpm, ~57-59 MPH.

Shoe, rideplate, diverter, loader, 12JC pump, 454

<<<Heavy azz 21' Eliminator day cruiser (3800lbs)

Dan'l

« **Reply #20 on:** February 08, 2016, 06:15:40 PM »

I'm not looking for 80 just the best performance I can get out of the boat

« **Reply #21 on:** February 08, 2016, 07:28:08 PM »

Please throw that loader on the scrap pile. I don't like anything about it. Not enough points of contact.

I have one of if you need it. Something is fundamentally wrong with that one.

« **Reply #22 on:** February 09, 2016, 03:59:17 AM »

Yes I do and I need to wear ring to do you have one of those and an insulator

« **Reply #23 on:** February 09, 2016, 10:42:42 AM »

Quote from: ron.h on February 09, 2016, 03:59:17 AM

Yes I do and I need to wear ring to do you have one of those and an insulator

You need an impeller, wear ring, loader and of course the related gaskets, bearings and seals.

Where are you located?

GT

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« **Reply #24 on:** February 09, 2016, 10:44:10 AM »

Winfield Louisiana and I have a new in impeller 90 the bull sale the oil seal and the two bushings

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mash on it

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