51
Engine Mechanical / Electrical / Re: Testing secondaries
« on: April 29, 2023, 11:06:50 PM »
Mechanical or vacuum secondaries?
Holley, Edelbrock or Quadrajet?
Dan'l
Holley, Edelbrock or Quadrajet?
Dan'l
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52
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.
Dan'l
With 425 HP, you should be around 5000 to 5100 rpm.
Dan'l
With 425 HP, you should be around 5000 to 5100 rpm.
53
Engine Mechanical / Electrical / Re: BBC 454 Peanut Head Replacement Parts
« on: April 03, 2023, 09:36:53 PM »
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.
Dan'l
>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.
Dan'l
54
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
Dan'l
55
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.
Dan'l
Angles are similar, so it's worth a try.
Dan'l
56
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.
Dan'l
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.
Dan'l
57
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.
Dan'l
Tom at JBP is a Mopar junkie jet boat enthusiast, to say the least.
Dan'l
58
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'
Dan'l
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'
Dan'l
59
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?
Dan'l
Dan'l
60
Engine Mechanical / Electrical / Re: Carburetor Selection 454 Jet Vacuum Vs Mechanical Secondaries
« on: January 04, 2023, 07:36:59 AM »
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?.
Dan'l
But I'm biased, both of mine have VS carbs, day cruiser and fishin' b?t?.
Dan'l
61
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.
Dan'l
Dan'l
62
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.
Dan'l
Congrats on your new baby.
Slowly getting my junk ready for the river.
Dan'l
63
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.
Dan'l
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.
Dan'l
64
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.
Dan'l
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.
Dan'l
65
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.
Dan'l
1065 summit cam with 76 cc heads. (218/218 at .050, .458/.458 lift)
Compression ratio is your friend.
Both cams recommend valve springs.
Dan'l
66
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.
Dan'l
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.
Dan'l
67
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.
Dan'l
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.
Dan'l
68
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
Dan'l
Small block Chevy air flow on a big block.
- Steve Brule, Westech Performance
Dan'l
69
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.
Dan'l
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.
Dan'l
70
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
Dan'l
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
Dan'l
71
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.
Dan'l
Dan'l
72
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.
Dan'l
Dan'l
73
Engine Mechanical / Electrical / Re: Olds 455 thread/misfire/overhear/autopsy/tune-up
« on: July 07, 2022, 09:37:57 AM »
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.
Dan'l
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.
Dan'l
74
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.
http://www.socaljetboats.com/projects/new-floor-install/
Good luck 🤞
Dan'l
http://www.socaljetboats.com/projects/new-floor-install/
Good luck 🤞
Dan'l
75
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.
Dan'l
I seem to remember it was a Spectra?
Screen name was your mom, as well as that boat.
2015ish. I'll do some searching.
Dan'l