Carb in a box question
 

https://cimg1.ibsrv.net/gimg/www.off...e4a6027326.jpg
This is the carb i got whit the engine..im missing the uper part of the box...can sombody tell me is this the right carb.the nubers on the coak horn are 80486...and1085..thank you guys

Ayuh,.... No idea what yer motor, 'n drive are, so no idea if it's the right carb,....

The box is for a turbocharged blow-thru application,....
So, if you don't have forced induction, you don't need the box,....

https://cimg0.ibsrv.net/gimg/www.off...169d49356c.jpg
502 cheavy all stock.with a m-1 procharger kit..

I'd check the list number again on the choke horn. On marine carbs it will be that 5 digit number but you must be a digit off cause that number doesnt exist.

It should work if it is bigger than 700 cfm I could not find a listing for it just keep a eye on your air fuel ratio numbers how are you altering your fuel pressure under boost.

That looks like its a carb off of an HP500. 800cfm 9022 carb

i'll whatc aut for that...thank you

https://cimg8.ibsrv.net/gimg/www.off...b2381ab254.jpg
Here is my chocke horn if you magnifie you'l see the nubers...thank you

Does that fuel pump generate enough pressure to be used under boost conditions

fuel pump makes 9 psi and my boost is going to be around 5 psi

I would keep a eye on your fuel pressure , sounds low , I like to have my pressure at 6lbs of pressure at idle and increase the fuel pressure 1lb per pound of boost pressure

At 5lbs of boost you are only going to have 4lbs of fuel pressure

When using a mechanical pump, it can be boost referenced (increase fuel psi 1psi per 1psi boost) by connecting pump’s vent nipple to boost source ie: the box.

Now, if volume is enough from the pump, that’s another area to figure out/find out.

i'll look into more before i start asking dum questions....engine is stil aut of the boat

great advice...now i have to learn the difference betwene lbs-psi..when i have some more numbers i'll get back to you..tnx

pounds is same thing as psi in our lingo.
pounds is short for pounds per square inch.

ok...your the man..:)

Some peep’s run your system. Just ran into this post:
https://www.offshoreonly.com/forums/...ml#post4835392

I’d check to see what carb # and how it is jetted/tuned/fuel pump used etc/etc. Always good to ask those who have done the same you are going to embark on.

thank you SB realy means a lot...mostly im surfing throu som old posts on forum trying to learn as much as posible...thank you i'll take a look

I have a complete spare box if you need one. Best carb for that app would be a holley 750. Fuel pump needs to be able to make 6 lbs at idle and 11 lbs when full throttle if making. 5 lbs boost..

No telling what that carburetor is. The 80486 doesn’t match anything via search through Holley list numbers. 80486 does come back as a classic series 950 but those carbs have contoured bodies with no choke tower. The baseplate also has a vacuum port for non-ported vacuum advance… should not be there on a marine carb so the baseplate has been changed/bowl vent tubes changed. Who really knows??

Can you get a picture of the baseplate with the numbers on the butterflies?

great tips thank you all...i've made a top of the box i'm going to try if it works then let you know...realy thankful for advice..tnx

i'll get the pic when i finish my yob...SB found a guy that has the same engine so i'll ask him more about the set up...you are all great..thanks so much

looks like the same engine...i'll send post to the guy and ask him will he help...hope he is a nice guy...tnx