SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: Deadend on April 06, 2012, 06:50:45 PM

Title: What carb should I buy?
Post by: Deadend on April 06, 2012, 06:50:45 PM: Im in need of a new carb and im having a hard time of witch one.
Going on a mild built 402 bbc
Title: Re: What carb should I buy?
Post by: mobboss on April 06, 2012, 07:28:34 PM: ok its always a little tuff to give what size carb to get. but here goes. do you have a heavy foot??? or just cruize, mild motor or is it goona get going??? i would prob start with a holley 750 db hell maybe 850. try this holley has a web site that will go thur what you want and need . and in the end spit out the size carb they think you should get. Good luck.
Title: Re: What carb should I buy?
Post by: ka0tyk on April 06, 2012, 09:31:18 PM: using cfm calc's online, with a 85% VE and a max rpm of 6000 i get about a 600cfm carb and with 100% VE being 700cfm. So I'd guess a 750 4 barrel mech secondary would be plenty.
Title: What carb should I buy?
Post by: Beaveretriever on April 06, 2012, 09:43:55 PM: I have a demon 750 dp that needs A rebuild kit, just gaskets and one accelerator arm. Pm for details
Title: What carb should I buy?
Post by: Deadend on April 07, 2012, 09:51:44 AM: I don't want another used carb that's why I'm looking for another.. And I am looking at a demon over a holly because of the price. And now I'm stuck in between the750 speed demon and the 750 mighty.. The speed would be perfect but if I end up building this motor up more then I'll be wishing I got the mighty...
Title: What carb should I buy?
Post by: Beaveretriever on April 07, 2012, 11:32:38 AM: A 750 demon flows really good. Unless your drag racing a single 750 will do fine for awhile. You know NASCAR used to run a Holley 390 and 355ci before the file injection. Jut saying don't over carb.
Title: Re: What carb should I buy?
Post by: ka0tyk on April 07, 2012, 07:44:40 PM: Quote from: Beaveretriever on April 07, 2012, 11:32:38 AM
A 750 demon flows really good. Unless your drag racing a single 750 will do fine for awhile. You know NASCAR used to run a Holley 390 and 355ci before the file injection. Jut saying don't over carb.

ive got a 650 on my 454 right now. demons are wet flow rated versus a holley. has no problem taking my little mild bumpsticked bbc to 5200 regularly. took the choke off of course...

(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fsphotos.xx.fbcdn.net%2Fhphotos-snc6%2F185951_10150124457504833_500759832_6538508_7693845_n.jpg&hash=0c8a84b68c8c62f9a2c10d6a015981f09d08bdf9)
Title: What carb should I buy?
Post by: Deadend on April 07, 2012, 10:27:35 PM: What about the difference between the speed and the mighty versions? Should I get the mighty with no chock tower since I won't be using one anyways? Or is this to much carb for a mild 402 ( I will be changing back to a 454 at mid summer 402 is my back up motor)
Title: Re: What carb should I buy?
Post by: crewchief22 on April 07, 2012, 10:59:47 PM: Get the Mighty, run it, have fun ;D
Title: What carb should I buy?
Post by: Beaveretriever on April 07, 2012, 11:06:44 PM: I agree with crewchief .
Title: What carb should I buy?
Post by: Deadend on April 08, 2012, 08:39:16 AM: Thanks guys!!