SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: Steel Gromet on May 04, 2011, 09:19:54 PM
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Well thanks for the replies on my first post! The advise was right on the money, but didnt have clue what I was doing (kinda). Removed the carb and took the bowls off. the prim bowl was wet, but the secondary bowl was dry. Probably the reason the secondaries were'nt opening up :screwy: Bought a trick kit and got most of the carb put back together, but there is 2 small cork pieces and not sure where they go?? Any info would be appreciated! Thanks. Can post pics if it helps, but just got home from work...
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they go around the air bleeds in the primary metering block...those little brass flat head screws on the side of the carb...one on each side
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If the piece is very thin like .030 it could also be a gasket between the vacuum secondary diaphragm housing and the carb body. Sometimes these are made of gasket material and sometimes cork. Pics always help.
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Vac. secondary carbs will never fully open the secondaries at jetboat RPMs unless you run an extremely light spring in the diaphram, then you will have a bog on acceleration as they will open too quickly. The additives in the fuel(alcohol or MTBE) will harden the sec. diaphragm in short order too. If you insist on using a vac secondary, plan on replacing the diaphragm every 3 to 6 months. No happy medium here, use a double pumper, you will be much happier. It is hard to overcarburate a jet motor, get an 850 or HP 970, even for a stock motor. The larger primaries allow you to cruise on plane on just the primaries, something you can't do with a smaller carb, especially a Quadrajet! TIMINATOR
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Thanks for the replies. There are so many gaskets and o-rings, one can easily get confused! Mounted the carb and so far so good. It fired right up! I will take it out next week and so how she does. Timinator put maybe I should ditch my carb and go with a double pumper. Would it be better on fuel economy and power? I'm running a BBC. I tracked down some previous owners, but all they new was it had a big cam. Took off the valve covers and it had GM performance heads and Crane roller rockers. When I took the carb off I looked into the intake (Weiand) and you could see some porting had been done. Also has a Bassett pan and new twisties. All braided lines with a stinger ingnition (havent heard of it). Anyways if you have any input I would appreciate it!!
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Congrats, don't forget to use a real good fuel filter for all that patience and hard work !
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Hey Gromet , When you heading out to Echo Lodge again ???
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Whats up Charger? No plans yet, but maybe cruise out to Blythe a few times. Got any trips planned?
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Be out at echo weekend after memorial with some Jetboat guys , Never been down to Blythe with my boat , How is it compared to the Parker strip?
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Probably not as rough, but havent been out there this year. Been missing all the trips working weekends. Pus its only 2.5 hrs from mi casa.