Everything done but low rpm at WOT. Distributor spring?

[VancouverBoat]

FWIW
At 100% Volumetric Efficiency a 460 cubic inch inhales 230 cubic inches per rev. so at 5000rpm it would inhale 1,150,000 cubic inches of air, which is 665.5 cubic feet. However since very few Naturally Asperated Engines can achieve 100% VE... I will be generous and allow an engine from the 70s to have a VE of 80%. So 80% of 665.5 cu ft is 532 CFM. I was also being generous as to the 5000 rpm, as I doubt OMC's WOT range was even up to 4600rpm

Yes, the specs in the reference for this 7.5 l engine in 1989 say 4400 - 4800

 

[Scott Danforth]

There probably should be regulations, but I cannot find any regulations that regulates what carb can go on a used boat. I have had tons of used boats and never knew to check if the carb was a marine version.

IMO regulations are "international" doesnt mean that people follow rules.

we also can argue VE all day long. that motor came with a larger carb from the factory that OMC determined was needed.

 

[Lou C]

I don’t know if this is the same in Canada as here in the USA, but here inboard boats must need CG regs including standards for engine systems safety such as J1171, spark protected alternators, starters, distributors and marine grade carburetors & fuel pumps. If there was an explosion here there would be an investigation & if non marine parts were found that could be legally difficult for the owner/operator.
If I had that boat; I wouldn’t trust that any of that was up to code & I’d be inspecting ALL of it. There was just a boat explosion here in Long Island (people survived but 2 went to the hospital) and another in Long Beach Calif that killed 2 people. That is NOTHING to take lightly.

 

[Lou C]

BTW as much as I like Chevrolet small blocks my next boat will definitely be an outboard. Don’t want to deal with the I/O issues (maintenance) and worries over safety. Yes I always open the hatch & sniff & I also have a gas vapor detector but that’s what I’ve decided.

 

[VancouverBoat]

I don’t know if this is the same in Canada as here in the USA, but here inboard boats must need CG regs including standards for engine systems safety such as J1171, spark protected alternators, starters, distributors and marine grade carburetors & fuel pumps. If there was an explosion here there would be an investigation & if non marine parts were found that could be legally difficult for the owner/operator.
If I had that boat; I wouldn’t trust that any of that was up to code & I’d be inspecting ALL of it. There was just a boat explosion here in Long Island (people survived but 2 went to the hospital) and another in Long Beach Calif that killed 2 people. That is NOTHING to take lightly.

I'm going to check.

 

[jimmbo]

Okay, your carb is still an Automotive Carb, and I don't know what recalibration, if any, was done to it before you acquired it, The Fuel Delivery Curve could be way off of what an Marine Engine needs. Yrs ago, Holley didn't offer Aftermarket Marine Carbs, they did make some for OMC and Mercury, and a few other Marine Engine Builders. But in a lot of cases, 3rd Party Marine Builders would just get Non-Emission Aftermarket Carbs, compliant or not.
The J-Tube vent are there to direct any overfill of the Bowl into the Intake. Throttle Shafts on a Marine Carb, have to be engineered to direct any Fuel towards intake, and not allow it to seep out of the Shaft Holes. Small things that help keep a Boat from Blowing up when the Key is Turned. Electrical Components are allow designed to keep any fumes from interacting with Sparks, and provide a means of Cooling any flames if they do interact.
Spark Arrester on the Carb, is big Heatsink, designed to absorb the Heat of any Fuel burning on the Wrong Side of the Carb Venturi, so it can't ignite any fuel fumes in the Engine Compartment

we also can argue VE all day long. that motor came with a larger carb from the factory that OMC determined was needed.

I suspect the Oversized Carb was put on there, as OMC was entering that Engine in Race Classes that required certain Parts, such as Carb, to be Factory OEMs. The Intake supplied on the 460 from OMC, certainly couldn't flow what a 750cfm could provide

 

[VancouverBoat]

Has anyone ordered a carb from https://www.carbcareusa.com/ ? are they legit at $510 for a marine Holley 4160 with electric choke?

 

[Scott Danforth]

I usually order from summit racing, however the last 5-6 carbs have been craigslist or facetube marketplace and I refurbished them for about 1/5th the cost of new.

Holley usually has sales on factory refurbished carbs on their site that will save you 25% over new

Not sure what carb they have listed. No where does it say which Holley carb it is

 

[jimmbo]

Has anyone ordered a carb from https://www.carbcareusa.com/ ? are they legit at $510 for a marine Holley 4160 with electric choke?

Don't forget the Exchange Rate, Duty and Taxes may apply, and then the Shipping here can get high. Check with a Holley Distributor in the Van area. I got my 4bbl Holley from the Distributor in the Edmonton area 20 yrs ago for a few hundred off Retail.

 

[Lou C]

Agreed buy BRAND NEW from Holley themselves anything that isn’t factory new can be a real pain to sort out.
I would not run that boat until you know ALL the electrical accessories are J1171 cert, and you have a marine carb.

 

[VancouverBoat]

I usually order from summit racing, however the last 5-6 carbs have been craigslist or facetube marketplace and I refurbished them for about 1/5th the cost of new.

Holley usually has sales on factory refurbished carbs on their site that will save you 25% over new

Not sure what carb they have listed. No where does it say which Holley carb it is

FOUR BARREL HOLLEY 4160 WITH ELEC CHOKE 460

BUY DIRECT AND SAVE !! THIS IS THE HARD TO FIND FOUR BARREL HOLLEY 4160 EVENBORE WITH ELECTRIC CHOKE PRICE INCLUDES A 80.00 REFUNDABLE CORE DEPOSIT. (PLEASE VISIT STORE POLICY FOR MORE INFO ) THIS IS A REMANUFACTURED 4 BARREL HOLLEY MARINE 4160 EVENBORE CARBURETOR MADE FOR OMC AND ALL FORD...

www.carbcareusa.com

 

[Scott Danforth]

FOUR BARREL HOLLEY 4160 WITH ELEC CHOKE 460

BUY DIRECT AND SAVE !! THIS IS THE HARD TO FIND FOUR BARREL HOLLEY 4160 EVENBORE WITH ELECTRIC CHOKE PRICE INCLUDES A 80.00 REFUNDABLE CORE DEPOSIT. (PLEASE VISIT STORE POLICY FOR MORE INFO ) THIS IS A REMANUFACTURED 4 BARREL HOLLEY MARINE 4160 EVENBORE CARBURETOR MADE FOR OMC AND ALL FORD...

www.carbcareusa.com

And where in the add does it state what it is other than a 4160 which is available in 390 to 750 CFM

 

[Lou C]

Holley 0-9015-2 750 CFM Marine Carburetor

All Holley Marine Carburetors are designed to meet Coast Guard specifications. A marine carburetors fuel metering system is calibrated to compensate for unique engine loads found on boats. The J-style vent tubes direct fuel/fumes back into the carburetor for safe operation while on rough...

www.holley.com

brand new
750 CFM
$597.95
not much more for new with new warrantee.

 

[Scott Danforth]

And Holley has a 10% discount if you want their emails

 

[jimmbo]

Holley 0-9015-2 750 CFM Marine Carburetor

All Holley Marine Carburetors are designed to meet Coast Guard specifications. A marine carburetors fuel metering system is calibrated to compensate for unique engine loads found on boats. The J-style vent tubes direct fuel/fumes back into the carburetor for safe operation while on rough...

www.holley.com

brand new
750 CFM
$597.95
not much more for new with new warrantee.

And it is a 4150, easier to Calibrate the Secondary Metering, than a 4160, however the pic shows Idle Mixture Screws on the Secondary Metering Block. Could be a generic pic though, as the Throttle Lever shown is an Auto Style versus the Flat one Holley has on their Marine Carbs.

 

[VancouverBoat]

Holley 0-9015-2 750 CFM Marine Carburetor

All Holley Marine Carburetors are designed to meet Coast Guard specifications. A marine carburetors fuel metering system is calibrated to compensate for unique engine loads found on boats. The J-style vent tubes direct fuel/fumes back into the carburetor for safe operation while on rough...

www.holley.com

brand new
750 CFM
$597.95
not much more for new with new warrantee.

Thanks. Was just going to order that and noticed that it is a backorder...

 

[Lou C]

You can try calling Holley & see if they have any updated info on that, and also check with resellers like Summit Racing & Jegs to see if they might have any in stock. In the meantime start inspecting all the electrical accessories on the engine for J1171 stamps or labels. If you’re going to keep the boat I would certainly want to know that it was as safe as it should be. Gas inboards are nothing to take likely.
Even fuses used in a closed gas engine compartment are different. Blade type fuses used in a closed engine compartment with gas engines should be ATC fuses not ATO. On an ATC fuse the area where the actual fusible section is located is sealed in the plastic matrix. The ATO fuse is open, and fumes could reach that area & get ignited because when the fuse blows the fuse arcs. So if you have an auto bilge switch with a fuse in the engine compartment use an ATC fuse. A little known factoid about fuses….

 

[Scott Danforth]

Here is a Holley 750 marine carb for $200. https://m.facebook.com/marketplace/item/662508025902783/?ref=browse_tab

 

[jimmbo]

Here is a Holley 750 marine carb for $200. https://m.facebook.com/marketplace/item/662508025902783/?ref=browse_tab

Butchering Already done, No Extra Charge...

 

[Scott Danforth]

Butchering Already done, No Extra Charge...

What butchering?

Other than coming with a fuel feed and most likely needing to be gone thru from sitting. I don't see any "butchering"