carburetor replacement?

This forum is for comments and the exchange of information relating to Trojan Boats and boating. Please do not post used parts or boats For Sale in this area. For general, non-boating topics please use our "General Discussions" section.

Note: Negative or inflammatory postings will not be tolerated.

Moderators: BeaconMarineBob, Moderator, BeaconMarineDon

Post Reply
dietwrite
Registered user
Posts: 28
Joined: Fri Oct 10, 2008 8:54 pm
Location: Arkansas

carburetor replacement?

Post by dietwrite »

I have a 1977 25' Express Cruiser. It looks to be the original 318 engine but currently has what looks to be the original carburetor. The gaskets on the carb. appear to be getting porous and I'm afraid of possible gasoline fume problems in the future. I Would like to replace this carb for this reason. Am not looking for performance due to the fact that 12 mph putting around the lake will be max speed. I am looking for the simplest replacement with the least amount of modifications necessary. The Edelbrock site has a 4 barrell carb. with electric choke; this seems to be the closest replacement available. Would this be a good carb to choose, and if so, how hard would the conversion be?
User avatar
prowlersfish
2024 Gold Support
2024 Gold Support
Posts: 12645
Joined: Sat Nov 05, 2005 6:56 pm
Location: Lower Chesapeake Bay ,Va

Post by prowlersfish »

A Edelbrock carb would be a good choice just be sure you get a marine carb .


http://www.edelbrock.com/automotive_new ... rine.shtml


the 1409 would be the one to use
Boating is good for the soul
77/78 TROJAN F36 Conv.
6BTA Cummins diesels
Life is to short for a ugly boat :D
jimbo36
Moderate User
Posts: 602
Joined: Mon Apr 21, 2008 9:20 pm
Location: Belleville, Ontario

Post by jimbo36 »

Why would you not have a marine mechanic overhaul the original carb with a carb kit?
dietwrite
Registered user
Posts: 28
Joined: Fri Oct 10, 2008 8:54 pm
Location: Arkansas

rebuilds

Post by dietwrite »

We looked into a rebuild. We're a little scared because we've never known of carb. rebuilds to be very successful... And as far as marine goes, there aren't really any competent people in this area that I know of! We looked on the internet to find a place to send it for a rebuild, and it was going to cost nearly as much as a new one. If you know of any reliable places, I'm open to suggestions. Thanks!
chucka
Sporadic User
Posts: 186
Joined: Mon Jul 18, 2005 9:33 pm
Location: RI
Contact:

Post by chucka »

I had the original Carter AFB on my 318 rebuilt in 2005 by http://carburetorusa.com/carburetor_usa_042.htm

I was having trouble hitting the rated RPM, and eventually sent out the carb for rebuild after a lot of other troubleshooting. They did the job right and I got 4,000 rpm from the engine for the first time when the re-built carb was re-installed. It's been three seasons and I have no complaints.

The cost was 1/4 to 1/3 the cost of a replacement carb. They offer 2 prices - one for a six month warranty, the other for lifetime. I went for the six month warranty because the warranty says returned Carburetors found to be contaminated with rust, dirt, old gas,or any other types of contamination will automatically void the warranty and a service charge depending on it's condition. That seem fair enough. They are located near Philadelphia. I would do it in the off season because it takes about a week for them to turn it around. If you call they will give you a time estimate. You need to drain absolutely ALL the gas from the carb before you can ship it. If the carrier smells any fuel they won't accept the package.

Good Luck,
Chuck
formerly
Lots A Luck
Trojan F-26 Express
Narragansett Bay, RI
dietwrite
Registered user
Posts: 28
Joined: Fri Oct 10, 2008 8:54 pm
Location: Arkansas

carb rebuild

Post by dietwrite »

We really liked your suggestion. We hadn't been to that site before. Thank you so much...this is probably what we'll do.
jimbo36
Moderate User
Posts: 602
Joined: Mon Apr 21, 2008 9:20 pm
Location: Belleville, Ontario

Post by jimbo36 »

You may also order a rebuilt carb from most supply companies. i.e. West Marine, Edelbrock, etc. They need your old carb to eliminate the "core" charge. (They rebuild yours). There is little differance between a new vs rebuild carb, other than cost. Amarine carb kit includes all new internal parts of the carb. The only part that is used for the rebuild is the case.
User avatar
guglielmo6160
Moderate User
Posts: 782
Joined: Mon Nov 10, 2008 10:07 pm
Location: cape coral florida

Post by guglielmo6160 »

I agree, I am a technican, buy a new one,,,, brand new, its just not worth the headache, trust me
1983 10 meter express
User avatar
guglielmo6160
Moderate User
Posts: 782
Joined: Mon Nov 10, 2008 10:07 pm
Location: cape coral florida

Post by guglielmo6160 »

one other thing, I know its alot of money, but they sell an outrageous fuel injection conversion,
they are expensive , but man what a difference, I dont have that on my current boat , but did install a setup on another single engine boat for a friend, and its like having a new engine,
runs perfect and the economy is much much better in the long run
1983 10 meter express
User avatar
ready123
Ultimate User
Posts: 1841
Joined: Sat Nov 08, 2008 5:53 pm
Location: Mactier, Ontario Canada
Contact:

Post by ready123 »

guglielmo6160 wrote:one other thing, I know its alot of money, but they sell an outrageous fuel injection conversion,
Who sells this fuel injection, any links :?:
Michael
Rum is the reason Pirate's have never ruled the world
Done Dreamin'
1987 President 43' Twin Lehman 225SP Turbo
Highfield 310 Ally 15 HP Yamaha 2cycle
1978 F32 Sedan twin 318 Chry SOLD
Safe Cove Marina, Port Charlotte, FL
rossjo
Ultimate User
Posts: 2799
Joined: Tue Nov 08, 2005 2:48 pm
Location: Charleston, SC
Contact:

Post by rossjo »

The Carter AFB and all Holleys are Square Bore carbs - meaning all 4 bores are the same size (1-9/16 to 1-11/16"): 2 primary - for slower speeds up to around 2,500 RPM + 2 Secondaries for WOT operation). They also have 2 float bowls and 2 needles/seats. Great for racing (except off road rough conditions), but not fuel efficient.

The Rochester Quadrajet (Qjet) is a Spread Bore carb - meaning the 2 Primaries bores are relatively small (1-3/8"), and the 2 Secondary bores are very large (2-3/8"). They have 1 float bowl and 1 needle/seat.

When you're idling or running at sower speeds (including planing in most cases), the primaries are in use, and the secondaries are closed. The smaller bore means that, for a given RPM, the air volume taken in (CFM = Cubic Feet per Minute) is the same for both types of carbs. With smaller primary bores (holes), the air velocity on the Qjet is greater, and you have better atomization of your fuel (especially at idle). This translates to better fuel economy, better throttle response and complete fuel burn.

Bottom line - the AFB was great in its day, but the Qjet replaced it for a reason. You can buy Marine Qjets completely rebuilt for $400-500. I replace the AFB in my 26' 454 boat with a Qjet which increased my fuel mileage by 1mpg to around 3.5mpg at 20-24knots. I have one in my old Corvette as well, and it passed smog emission tests after being rebuilt (and goes like hell!) - which an AFB would never have done.

Consider a Qjet!
Captain Ross, 2009 Trojan Boater of the Year
"Viva Mahia" F32 Cummins 6BTA diesels,
"Mack Attack" Chaparral 244 Fish, SeaPro 180, McKee 14, Montauk-17
Image
User avatar
RWS
Ultimate User
Posts: 2857
Joined: Sat Feb 18, 2006 7:01 am
Location: West Coast Florida
Contact:

Post by RWS »

When I had the gas engines (454's) the flowscan showed one engine using up to 5 GPH more than the other engine.

I founda guy in Miami who SPECIALIZED in MARINE carburetors. (2002)

He determined that he metering rods in one of the quadrajets were not for marine use but for an automobile.

He ebuilt and exchanged the metering rods and reduced that fuel uasage problem.

Try OMAR at JUST CARBURETORS in North Miami BEach.

RWS
1983 10 Meter SOLD after 21 years of adventures
Yanmar diesels
Solid Glass Hull
Woodless Stringers
Full Hull Liner
Survived Andrew Cat 5,Eye of Charley Cat 4, & Irma Cat 2
Trojan International Website: http://trojanboat.com/

WEBSITE & SITELOCK TOTALLY SELF FUNDED
Post Reply