Marine carburator

[Wes Hawkins]

Guys, first I want to thank everyone who has answered my stupid questions over the last several months. I just bought an 84 seaswirl with a 4cyl merc with a merc out drive. It had a low cylinder and I got it cheap because of that. It ended up being a bad exhaust valve which I have already repaired for a few hundred bucks. I was going to rebuild the carb but when I noticed the choke had been removed I thought I would get a rebuilt one. WOW, can someone please tell me what the difference is between a "MARINE CARB" and an automotive card beside 700.00 dollars?
Wes.

 

[Summer Fun]

Re: Marine carburator

Where are you looking at Carbs that cost $700 bucks ??.

My carbs have a tube that dumps fuel into its-self if a float sticks.

I think thats the only differences ???.

 

[Wes Hawkins]

Re: Marine carburator

That price was at are local NAPA store but even the price here on I-Boats is over 500.00. I notice there was a tube that went from the air horn back to the fuel pump as a fuel return but other than that I can see little difference.
thanks, Wes

 

[Summer Fun]

Re: Marine carburator

Do you have a pic of it ??. It could be a automotive carb that the PO put on ??

 

[Wes Hawkins]

Re: Marine carburator

Sorry, I haven't got any pictures of it but I think its a marine carburator because the fast idle cam isn't stepped like it is on a automotive carb. I'm thinking the choke failed and the PO just took it off and sealed the mounting holes up and went without it. I've got enough old carbs around to make a mount and put an electric choke and pull off on it before I spend 500.00 bucks on a rebuilt.
Wes.

 

[superbenk]

Re: Marine carburator

I'm kind of curious of all the differences too. That fuel line between the pump & the carb is there in the event the diaphragm in the pump fails. It'll dump fuel up into the carb & into the engine rather than into the crank-case or bilge. Safety device.

 

[GatorMike]

Re: Marine carburator

I can't answer the question for sure but I can give an educated guess based on something that happened to us back in 1982. When I graduated from college in 1982 my dad bought me an 82 Chevy Monte Carlo as a graduation present. A year or so later we were having some problems with the way it was running and I took it to the Chevrolet dealer for some warantee work. The dealer said I had voided the warantee by putting a marine carborator on it. I insisted that no wrench had ever touched that motor. We had a huge argument because he insisted it had a marine carb. I asked what the difference was and he said only the part number.

Further investigation revealed that my motor was the last 350ci engine off the assembly line before they switched over to a run of marine engines. We eventually came to the conclusion that somebody miscounted.... It's a true story but I wouldn't take it as fact that the only difference is the part number, that is just what I was told at the time.

 

[GLENN M]

Re: Marine carburator

There is big differance marine carbs cannot leak fuel out any vents they must leak internally same as fuel pump for safety no fumes in bilge same as alternator must be sealed so no sparks outside housing replace these parts with marine parts only its also the law

 

[Borchik]

Re: Marine carburator

exactly as Glenn M said.

 

[zbnutcase]

Re: Marine carburator

And a lot of auto 2GC Rochesters have vent holes in the throttle body, a huge no-no for boats. Just remember, "cheap" and "boat" do not go together at all.

 

[LAC_STS]

Re: Marine carburator

There are that are bent on a marine carb to shoot the fuel back into the carb instead of into the bilge.

But besides that if you look at specs on the Edelbrock site the marine carb has slightly different jets, metering rods, and the marine carbs have less of a counter weight on the secondary air butterflies.



Just google edelbrock 1409 I have found them brand new not reman for $330.

Bolt it on and go.

 

[JustJason]

Re: Marine carburator

You can find 2GC's for less than 500, just shop around.

Carb's are fairly complicated items that take quite a bit to make, they are pricey no matter how you slice it.

 

[Wes Hawkins]

Re: Marine carburator

Thanks guys for all the info. I do think the one I have is a marine carb, it has a tube that runs from the air horn back down to the fuel pump in case of flooding and to return any fumes. I think the PO just removed the choke and linkage and didn't replace it for what ever reason. Someone mentioned that the jetting was different, I was wondering about the jetting because a boat engine has its power range higher up the rpm range. I'll take this one apart and rebuild it and fabricate a choke system.
I do know from all my years working in auto dealerships that when ever they wanted to increase the price of an existing part they had to change the part number. I just don't understand why a marine carb has to be twice what an automotive carburator is, especially when this systems technology is over 30 years old. When the last time you saw a non-computerized feedback carb on anything other than a boat since the early 80's. I guess they think if you can afford a boat then whats a few hundred dollars more for a part.
Thanks guys, take care, Wes,

 

[LAC_STS]

Re: Marine carburator

Theyre not twice as much if you look in the right place.

the highest I have saw the edelbrock 1409 is $500. You can find then for $320 if you look on Google Products search.


About the jets and metering rods, this is what I found out about Edelbrocks. Im sure it is that way too with other carbs.

This is the difference between the Edelbrock 1409 and the 1405.

1405

Metering jets Primary .100 secondary .095
Metering rods .070 x .047
Step up spring orange (5 Hg)


Marine 1409

Metering jets Primary .098 Secondary .101
Metering rods .068 x .047
Step up springs orange (5 Hg)