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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.


Engine Mechanical / Electrical / Re: Olds 455 thread/autopsy/tune-up
« on: July 08, 2022, 11:25:21 pm »
Olds heads...
Small block Chevy air flow on a big block.
                 - Steve Brule, Westech Performance


Engine Mechanical / Electrical / Re: Olds 455 thread/autopsy/tune-up
« on: July 07, 2022, 09:03:41 pm »
And you'd be right 👍.
I've never seen that setup before.
Learn something new every day.

Original Berkeley hose fitting on the pump had a ? inch hole on the hose side. Check if yours still has one.


Engine Mechanical / Electrical / Re: Olds 455 thread/autopsy/tune-up
« on: July 07, 2022, 05:32:57 pm »
First off, the 140? tstat is a no-no in a single pass cooling system.
The water needs to be slowed down on a single pass, and it's done at the pump. (Gate valve) The tstat is a dead end for the water, and air too, the system needs to purge the air out. Tstat doesn't allow this, and builds too much pressure too.
A pressure regulator may seem like a good idea, but it only takes a few grains of sand to make them useless. A gate valve doesn't care. And pressure falls in line nicely too.

The HEI ccw,...I forget about that, but I've made my own out of thin aluminum bar stock, and a jig saw.

I understand your reasoning on the 5w-30, but boat oil pans run hot, and Id suggest something more robust, like my favorite Delo 400, 15w-40, or Valvoline racing 20w-50 or similar.

For the pump, the only way to tell is on the impeller, and sometimes it has to be measured. The tag on the front of the pump should say what impeller was shipped in the unit, such as JC-A or JC-2A. But that was nearly 50 years ago.

I would freshen up the pump before I added on loaders , and ride plates. 2A or AA would be my choice, as top speed isn't a priority for me. (That Olds wouldn't mind it either) An A impeller is typical for most big blocks, factory. My day cruiser has a AA American Turbine impeller, a heavy old barge (454).

Hope this helps

Jet Pumps / Re: Prime a jet
« on: July 07, 2022, 09:45:08 am »
Probably a speck of sand or two holding it off the seat, I'd try compressed air and blow thru it or maybe some WD40.


Jet Pumps / Re: Fastest Olds powered jet boat
« on: July 07, 2022, 09:41:35 am »
A guy in Bullhead (Mark, I think?) has an Olds powered sled, mid 70s mph, but I don't know what's been done to it.


A couple of things, and I know you're a car guy -

Vacuum advance... not needed on a boat. Get a vacuum advance lockout plate for the GM HEI. More accurate timing at higher rpms.

Holley carbs, off the shelf, need to be tuned different than a car.
Usually larger primary jets, and the lightest secondary diaphragm spring. As well as a different power valve. (Lower vacuum rating, opens later rather than sooner)
 Edit: just seen you added a double pumper, jetting and power valve still applies.

You might well know of the oil mods an Olds needs to keep the oil in the pan. If not, it's here around scjb tech section somewhere.

What pump do you have?
Assuming Berkeley? What impeller?

Water temp and pressure -
With open headers, water temp should be ~110?-120? at cruise.
This is not a car with emission controls and cats.
180? is almost meltdown temp. Your normal running temp wasn't stated.
Pressure should be in the 10 to 15 psi range, and is easily regulated with a gate valve at the pump, simple, no moving parts, and virtually fool proof.

Plumbing should be from the pump, gate valve, to the front of the block (Olds water pump plate). Out the former thermostat housing, to the transom, overboard. A header valve is usually installed at the former thermostat housing, and plumbed accordingly. However, I run a ball valve at the driver's seat to control header water flow.

That's all I got for now.
Yeah, bent valves and pushrods suck. Aluminum heads are always good. Good luck with your project.


Fabrication / Re: Ski Tow
« on: July 01, 2022, 01:17:49 pm »
Here's his build thread, but no mention of the ski tow, but it's in the pics on the second page.

Good luck 🤞

Fabrication / Re: Ski Tow
« on: July 01, 2022, 01:02:53 pm »
I believe he built that ski tow. There's a thread on here about the whole build up of that boat.
I seem to remember it was a Spectra?
Screen name was your mom, as well as that boat.
2015ish. I'll do some searching.


Fabrication / Re: Ski Tow
« on: June 30, 2022, 08:45:58 am »
Got it polished back up an together for the season today...

This was from 'Your Mom' back a few years ago, in "what did you do to your boat today thread", page 150, about half way down.


Jet Pumps / Re: Loader Help
« on: June 20, 2022, 06:01:30 am »
Has the current loader been tuned to your pump/boat? That's where I'd start.


Jet Pumps / Re: Holley jetting, PV baseline
« on: June 16, 2022, 08:16:49 am »
Speedway has a vacuum advance block off plate for GM HEI distributors. Waaayyy more accurate spark than a rubber diaphragm trying to hold things steady.

As far as jets, if I remember right, my 750 VS had 74's in the front, and a 6.5 PV. And lightest spring in the secondary diaphragm.
(454, 9:1, Vic Jr. manifold, .575"/.575", 230?/234? roller, 750 vs, logs and snails)


Projects / Re: Panther jet conversion
« on: May 31, 2022, 01:47:08 pm »
I believe Jet boat Performance has a conversion to a mixed flow pump.


Engine Mechanical / Electrical / Re: Bbc oil pan
« on: May 24, 2022, 08:09:38 am »
Spoke to Dooley today and they are 1056 for there pan

Sent from my iPhone using SoCal Jet Boats

Mines a Gen V, (1pc rear main) and has been sitting since 2005. If yours is a Gen V, I might part with it.


Engine Mechanical / Electrical / Re: Bbc oil pan
« on: May 23, 2022, 09:36:13 am »
Mine has a Dooley pan, but mines not a Stroker motor. Jet boat performance would be my choice.


Engine Mechanical / Electrical / Re: 60 mph @ 4400 rpm
« on: May 17, 2022, 09:32:55 am »
Mine showed 4500 rpm, and was at 55, with 3 aboard. (19' Saguaro, SBC)
Your in the ballpark.
Tach could be slightly off.
Gps could be slow.

Run it.


I used a 4x4 block of wood in the exhaust and a floor jack to add a little clearance, but alas, mine were SBC, sprint car headers, and were almost completely shot. It worked for the next several seasons.

Jet boat headers are approx 5* down, as as manufactured, and v-drive are approx 5* up as manufactured, a difference of 10* (approx), just an FYI.


Jet Pumps / Re: Bad bearings?
« on: May 08, 2022, 12:37:07 pm »
Check how the new bearing fits into the bearing housing before it's pressed on the shaft.

The bolts holding the housing in are 'mostly' for clamping the epoxy in place.

Bowl looks serviceable yet. But wouldn't hurt to clean up the front side bowl veins.


Hulls / Re: Which is better?
« on: May 07, 2022, 10:11:00 am »
Rayson Craft.
Go racing.

Both are solid hulls.
Current engines would would make a difference.


WarZone / Re: New
« on: May 01, 2022, 09:41:17 am »
Welcome to the madness.


The No Wake Zone / Re: Needing hull identification
« on: April 15, 2022, 09:38:11 am »
A Lazy Harry's landmark?

Would love to hear the story on it.


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