Could Someone explain the funtion of this Carbarator ?

[tigerhack]

could someone tell me how the big butter fly on this carbarator is open is it by compression or by the vacuum line from the carbarator ? cause mine has nothing connected to it , this picture is a sample . 1992 regal 233xl mercrusier 5.7.

 

[Maclin]

Re: Could Someone explain the funtion of this Carbarator ?

It is spring loaded. This concept is called an Air Valve Secondary. There are butterflies on the bottom plate that open with the throttle. The plates on the top will open as soon as the engine airflow overcomes the spring pressure. Notice how the pivot rod is not in the middle for the top plates. The uneven pressure on the top plate causes it to want to open.

 

[John_S]

Re: Could Someone explain the funtion of this Carbarator ?

That is a Q-jet air door. It is opened by the vacuum in the secondary barrels. The vacuum must overcome a wind-up spring.

PS: While an example picture, it looks like an auto crab.

 

[Bondo]

Re: Could Someone explain the funtion of this Carbarator ?

Ayuh,........

This would go Much Easier if you just answered the many Questions posed in Your Other thread.........

mercrusier 5.7.

Such as this little tid-bit of Info you've neglected to mention in your Other thread......

The way these forums are Supposed to work is,.......
You ask a Question,......
Somebody here either has an Answer,....
Or,... Asks other Questions of You, so We can follow the Diagnostics.......
This is a 2 way street,..... If you Can't help Us help You,.......
Your boat Won't get Fixed,+ in the process, You turn-off the other knowledgeable people Trying to Help You............

So far, in your Other thread,.....
You asked a Question,......
And Haven't really responded with ANY follow up Info to help you find the Real Problem.........

Good Luck,..........

 

[tigerhack]

Re: Could Someone explain the funtion of this Carbarator ?

Ayuh,........

This would go Much Easier if you just answered the many Questions posed in Your Other thread.........

Such as this little tid-bit of Info you've neglected to mention in your Other thread......

The way these forums are Supposed to work is,.......
You ask a Question,......
Somebody here either has an Answer,....
Or,... Asks other Questions of You, so We can follow the Diagnostics.......
This is a 2 way street,..... If you Can't help Us help You,.......
Your boat Won't get Fixed,+ in the process, You turn-off the other knowledgeable people Trying to Help You............

So far, in your Other thread,.....
You asked a Question,......
And Haven't really responded with ANY follow up Info to help you find the Real Problem.........

Good Luck,..........

Sorry my reason for that is i already solved the problem, i know i should have responded to it but when i come back to the forum sometimes it is so hard to find what i have post, do you know a easy way to find my last post ?

 

[John_S]

Re: Could Someone explain the funtion of this Carbarator ?

"do you know a easy way to find my last post ?"

Left click on your name in this post, and view all your posts.

BTW, don't assume everyone reads every thread. I had not read the earlier thread.

 

[180shabah]

Re: Could Someone explain the funtion of this Carbarator ?

Glad you fixed it, what was it?

 

[180shabah]

Re: Could Someone explain the funtion of this Carbarator ?

Sorry my reason for that is i already solved the problem, i know i should have responded to it but when i come back to the forum sometimes it is so hard to find what i have post, do you know a easy way to find my last post ?

Setup your user profile to send e-mail notifications anytime there is a response to one of your posts.

 

[tigerhack]

Re: Could Someone explain the funtion of this Carbarator ?

Glad you fixed it, what was it?

NO i havent fix the problem yet , i mean the other 100 problem before is fixed, i never see a boat with so much problem, i guest it is because i am restoirng it totally and i like things to be perfect , for the carbarator problem i am going to try a electronic pump with more psi , what psi that carbarator requires ? (1992 regal 233xl 5.7 mercrusier)

 

[Bondo]

Re: Could Someone explain the funtion of this Carbarator ?

i did change the mechanical pump to a electronic pump

for the carbarator problem i am going to try a electronic pump with more psi , what psi that carbarator requires ?

Ayuh,.......

According to You, in your Other Thread,...... You've Already Done that.........

Which is it,..??..??.....

Btw,......
All Carbs require 4/6psi......

 

[achris]

Re: Could Someone explain the funtion of this Carbarator ?

Too high pressure to the carb and you'll push the needles off their seats and end up with a flooded engine, which you will blame the poor (usually) innocent carb for.

Chris...............

 

[JustJason]

Re: Could Someone explain the funtion of this Carbarator ?

that's definitely an auto carb. I hope its not on your boat!!
Those electric q-jets suuuuuuucked!

 

[rodbolt]

Re: Could Someone explain the funtion of this Carbarator ?

q-jets can handle 9-9 PSI however try to regulate it to 5-7 PSI, the automotive version of the Q-jet wont hurt as the fuel bowl vent is still USCG compliant. only draw back is trying to cap off all the unused vacum ports without affecting carb calibration.
you MUST wire the electric pump through an oil pressure switch or a set of relays that takes an output from the terminal on the altenator that does NOT have 12v with key on engine off.
this prevents the fuel pump from running in the event of an unanticipated engine shutdown, most likly due to flooding or fire.
my suggestion would be to use the correct carb and mechanical pump and go play happily everafter.

 

[krisnowicki]

Re: Could Someone explain the funtion of this Carbarator ?

are all carbs with this shape a q jet?

 

[180shabah]

Re: Could Someone explain the funtion of this Carbarator ?

are all carbs with this shape a q jet?

No.

It's a brand/model thingy, and has nothing to do with shape.

 

[tigerhack]

Re: Could Someone explain the funtion of this Carbarator ?

Ok i take the boat out again , and i have the same problem , its not low fuel pressure , cabarator revs out fine, but when trying to accelerate , the engine wants to shut off , its more like cant go in hi speed , this is a tough one i need to do this properly, in the caymans the beach is great , but we have reefs and channel that we must be careful off and your boat have to be in good conditions, just to let you all know Stingray city here is a paradise, anyway the water that is coming in is coming right over shaft that pass through the gimbal bearing , and it is running like a pipe , bilge pump kicks in every 20 minutes, i dont see a tear on the rubber so i dont know where to start can some one point me where ?

 

[sarantis]

Re: Could Someone explain the funtion of this Carbarator ?

As about your carb problem, i had similar problem ,i haven't fixed it yet because i have to pull the boat out once more, but after much searching i conclude that my problem is the exhaust pipe and the flaps inside it.i think that the coggled pipe prevents the carb from breathing properly (thus the buterfly you are talking about doesn't open ).Don't forget to send us the solution when you fix it

 

[tigerhack]

Re: Could Someone explain the funtion of this Carbarator ?

As about your carb problem, i had similar problem ,i haven't fixed it yet because i have to pull the boat out once more, but after much searching i conclude that my problem is the exhaust pipe and the flaps inside it.i think that the coggled pipe prevents the carb from breathing properly (thus the buterfly you are talking about doesn't open ).Don't forget to send us the solution when you fix it

OK I WILL DO SO, WHEN AND IF I SOLVE THE PROBLEM .

 

[sarantis]

Re: Could Someone explain the funtion of this Carbarator ?

I forgot to mention that in the case of coggled exhaust pipe you should also notice higher temperature when driving for some minutes at the maximum possible speed since the water circulation would be also affected.

 

[tigerhack]

Re: Could Someone explain the funtion of this Carbarator ?

I forgot to mention that in the case of coggled exhaust pipe you should also notice higher temperature when driving for some minutes at the maximum possible speed since the water circulation would be also affected.

i have good Temperature, and the boat do not plane off, the back of the boat is still in the water while the front is up, someone say the engine might be Governed, where should i look for these possibilities?