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Engine Mechanical / Electrical / Re: Marine Power 454 White smoke
« on: May 29, 2023, 10:14:56 PM »
Sounds like carburetor problems.

Start with the basics, a compression check.
If that is good, then it's sounds like carburetion.
Q-jets aren't your friend here. They belong on tow trucks and motorhomes. (In my honest opinion)
Tuning a q-jet can be done, but isn't as simple as a Holley.
Metering rods and and jets for a truck and usually too lean for a jet boat. The idle quality sounds like something is suspect. Q-jet should have a good idle, even on a jet boat.
Fuel pressure sounds like it's not steady at 7ish lbs to keep you running.
Non vented fuel tank(s) could cause this too, as well as a clogged fuel filter.

Several things you need to look into.
Make sure initial timing is good to go and your ignition system isn't failing either (bad coil or module?)


Just my $0.02.

Jet Pumps / Re: SD309 American Turbine Cavitation Issue ?
« on: May 29, 2023, 09:57:42 PM »
You want to file the leading edges of both the impeller and the bowl.
Think airplane wing, not knife edge (weaker) while you're there, check the radial tolerances of the impeller to wear ring. It should be at ~0.0125" per side (radial), and .025" to .030" at the leading edge, if I remember right (shouldered). Shims will help you with your leading edge dimensions. Wear rings are available undersized based on your skirt dimensions.

Any questions, pm me.


Jet Pumps / Re: 1973 Silverline Jet Boat Problems
« on: May 28, 2023, 07:26:36 PM »
As 76Manra455 said, something else is in the pump. Next thing is to pull the bowl off. The trailing edges of the impeller could be trashed, or even have a rock wedged in the impeller or bowl.

Pretty simple to get the bowl off, and if you find nothing in the pump, it's at least peace of mind that everything is ok.

Olds are not the best at oiling, if everything is still factory stock. I hope you don't have to get into the motor to find the vibration.
With the speeds vs rpm, it's most definitely in the pump.

Just my $0.02


Hulls / Re: Honest mph
« on: May 23, 2023, 04:58:27 PM »
21' Eliminator Day Cruiser
Mild built 454. 57 up river.
19' Saguaro open bow.
Vortec 350 sbc. 55, loaded with family, ready to roll.
19' Glencoe. 454, XE cam, Bassetts.
Best ever, solo, 71.8


It sounds like your idle air bleed adjustment is out of whack too.
Get the fuel bowl level addressed first and then your idle air bleeds.
You stated half a turn out, and as a starting point, should be a turn and a half out. Then adjust from there, in small increments.

Q-jet, 2bbl 2gc, Holley, Edelbrock, john Deere, Briggs and Stratton carbs, the starting point is a turn and a half out.

Hope this helps.


Projects / Re: 460 Build Help
« on: May 17, 2023, 08:55:12 AM »
450 HP should be quite obtainable with mostly stock parts.
Quite a few 460 builds here on the boards.
Impeller selection is key for the HP you want. Knowing what it already has helps too.


Projects / Re: Mystery jet boat
« on: May 17, 2023, 08:51:39 AM »
The swoop on the bottom side of the dash reminds me of a Hallett v drive.

The angled area just forward of the transom reminds me of early Eliminator jet boats.

Since it has a hin, it's newer than 72 or 73.

Does it have any strakes?


Projects / Re: Mystery jet boat
« on: May 12, 2023, 08:49:04 AM »
PMP makes pontoons out of Florida, and started in 2007. I don't think yours was made by the pontoons company.
There was a way to find out who had the manufacturers hin initials prior to the current owners. If that makes sense. I just couldn't find it.
The round transom hole for the jet bowl reminds me of a superjet. Who made the superjet, Hondo? Sanger? I can't remember.
Regardless, looks like a cool project. What are your plans? Big horsepower? Mild cruiser? Yard art?


Engine Mechanical / Electrical / Re: Testing secondaries
« on: April 29, 2023, 11:06:50 PM »
Mechanical or vacuum secondaries?
Holley, Edelbrock or Quadrajet?


Engine Mechanical / Electrical / Re: Secondaries opening very slow
« on: April 25, 2023, 09:48:54 AM »
I use the lightest spring in the secondaries, on a 750 Holley 4160.


With 425 HP, you should be around 5000 to 5100 rpm.

Rock Auto>Chevrolet>1996
>C2500>7.4L>engine >exhaust valve> starting at $3.33.
Poke around and find the spring, rotator, and valve retainer.

Same deal for Summit, Jegs,  Speedway and Scoggin-Dickey, etc.


Boat Racing / ADBA Drag boat racing, Parker, Mar 31, Apr 1&2
« on: March 29, 2023, 08:17:40 AM »

ADBA in Parker, AZ
March 31st, and April 1st and 2nd.
At Pirates Den Resort


Projects / Re: 73 wriedt maverick
« on: March 24, 2023, 11:59:24 AM »
I'd try it.
Angles are similar, so it's worth a try.


Projects / Re: 73 wriedt maverick
« on: March 18, 2023, 02:29:53 PM »
Nice find!

Looks like a bankruptcy starter kit, complete with a blown Olds?

Good luck, and happy boating ahead!

Looks like it could be a circle race boat.


Projects / Re: 74 hondo
« on: February 15, 2023, 10:26:38 AM »
Yes, why not?, And yes.

Tom at JBP is a Mopar junkie jet boat enthusiast, to say the least.


The No Wake Zone / Re: Wet or Dry headers
« on: February 14, 2023, 12:27:19 PM »
Race boat? Dry.
Family boat? Definitely wet, at least under way, and dry at idle.

Even wet headers throw some serious heat forward.

My old man cruisin' boat has logs and snails, just sayin'


Jet Pumps / Re: Jet drive basics/mods tutorial - help ?s
« on: February 07, 2023, 12:20:16 PM »
Did Flushers post answer All of your questions?


I'd stay with a vacuum secondary carb. Pretty reliable and trouble free once setup correctly.
But I'm biased, both of mine have VS carbs, day cruiser and fishin' b?t?.


Engine Mechanical / Electrical / Re: MSD Distributor Question
« on: January 02, 2023, 02:18:45 AM »
Generally, the lightest springs, and all in (full advance) by 2500-3000 rpm.


The No Wake Zone / Re: Email Notifications are working again
« on: January 02, 2023, 02:15:30 AM »
Thanks Brad!

Congrats on your new baby.

Slowly getting my junk ready for the river.


WarZone / Re: August Trip 2022
« on: August 26, 2022, 01:59:17 PM »
Pro tip-
While gas (weed eater) powered blenders make quick work for a tasty cold refreshing margarita, they are not recommended in the rooms at the AVI.

Just an FYI.


Engine Mechanical / Electrical / Re: Cam selection need help
« on: July 30, 2022, 10:14:36 PM »
With the Panther pump, it will absorb whatever HP you throw at it. However, because it's an axial flow pump (prop in a tube) it hits a wall at around 5,000 rpm, (think big block) and more HP becomes virtually useless. A mixed flow pump would handle the HP better.

A tight pump is better for performance, and probably would be a better place to start. Plenty of tutorials on YouTube will give you an idea on how to.

After a fresh pump, I'd add HP with a cam and if needed some good flowing heads.


Engine Mechanical / Electrical / Re: Cam selection need help
« on: July 30, 2022, 09:58:49 PM »
Without knowing what heads, 1104 summit with 64 cc heads,(224/224 at .050, .466/.466 lift)
1065 summit cam with 76 cc heads. (218/218 at .050, .458/.458 lift)

Compression ratio is your friend.

Both cams recommend valve springs.


Engine Mechanical / Electrical / Re: Cam selection need help
« on: July 29, 2022, 10:08:48 PM »
Any idea on what year or vintage the SBC has? Casting numbers on the block and heads would also help.
Impeller size? What pump for that matter too.

Comp cams and Edelbrock have some Dyno charts on their most popular cams, which, along with an impeller chart can get you in the right direction.

Just picking a cam with huge duration isn't going to be happy with stock (severely inadequate/smog) heads, but there are some factory offerings that are better than others.

I've ran as much as 235 degrees at .050 on a big block with logs and snails, with no reversion.

For a stock 350, the Eddy performer works pretty good, .420/.442 lift, and pretty tame.
Summit has a few inexpensive offerings, like the 1103, 1104, 1105, etc.

If it's a roller block, there might be a chance at decent compression, and Melling has a few rollers available and affordable.

While logs and snails and not the best for performance,  they're not nearly as bad as single exhaust on an 85 Camero or 85 Chevy pickup.

My short recipe -
96 suburban short block, stock roller cam.
Crappy but functional swirl port heads, 64cc (Compression ratio is 9.2-9.3 to 1)
Eddy performer rpm intake and 750 Holley, GM HEl. 1.6 roller tipped steel rockers.
Sprint car headers, with water added.
A Berkeley impeller.
55 mph at 4600 rpm, all day long.
Combo is 325-330 HP. It's not a rocket, but reliable as a brick.


Jet Pumps / Re: How to tell what impeller (Berkeley)
« on: July 12, 2022, 10:46:12 AM »
There SHOULD be a letter stamped onto the center hub of the trailing side.
The letter could be wrong after 45+ years, if it has previously been machined before, and not restamped.... (A to an AB or B, etc.)

Only real way to know is pulling the bowl.
And then measure it.
JBP and CP Performance have charts on sizes and HP absorbed.

A refreshed pump will absorb more HP, at a lower rpm.

A loose pump will run at a higher rpm.


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