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#1
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What Carb will work with this setup?
This is the setup:
440+.30 over KB 10:1 Pistons LY Rods Hughes Maximum Velocity Street solid hev3945bs int.546 exh.560 239* @.050 int 245* @.050 exh 108* LSA Hughes Valves Springs&Lifters 452 Heads cleaned up, all new goodies Performer RPM Manifold Edelbrock 750 Carb Heddman 1 3/4" Headers I'll be running a 727 with a hughes convertors 3500 Stall. TranZact manual Shift Valve Body and 3:55 Gears.(for now) My question is: Do I need a bigger carb? I like my 750 Ededlbrock that I have, but I'm not sure it will be enough for this motor. I'm looking at the 800 Edelbrocks and a 850 holly DP. I have to go the used carb route, cuz I'm outta cash! If I need to go bigger, I'll put the 750Edelbrock and the extra 750holly I have on E-Bay.....unless I can work a 2 for 1 deal. Thanks |
#2
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what rpm?
whats more important, driveablity day to day, or pure race horsepower? the 750 should be plenty unless you are going over 6500 rpm, and that last tenth is more important then the last MPG |
#3
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It's more of a street ride, but I will go to the track a few times.
I can't see me pushing over 6000 rpm (cast crank) The 750 Edelbrock that's on there now has been worked over a bit, but I don't know what has been done. It was on a very mild 413 last year, and ran a 14.3 1/4 mile (sloooow). It ran on the fat side with the 413. Just from reading the plugs. |
#4
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going by the numbers, a 750 is going to be just fine. I'm sure someone will suggest a 1050 dominator for it, but, unless it is just a race only piece, that 750 will do you justice.
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#5
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Thanks dewme,
You don't think it will be under carbed? I know very little about carbs. I know I don't want it to be LEAN. The carb I have now performed beautiful, no stumbels or anything. |
#6
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big is better
nice set-up. personally i would go with a hp950 vac. secondaries or a 1050 dominator. why? what rpm range is your cam rated for, probably 6500. the volumtric effeciency on a regular street engine is 85%. racing engines are over 100%. yours is not a typical street engine. more like a mild racing engine. a stock 440 a 750 is fine. figuring at 95% you need at least an 800 carb and at 100% volumetric eff. you need at least an 850 carb. i would sell the other carbs and buy the right carb. the 950 is vac sec. and is a very streetable carb and great for bracket racing esp. with the stall. you've done all this stuff to your car so don't bottle neck the air intake on this monster. let's get it on.
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#7
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mr. b,
Your response is exactly why I look to people like yourself for help...Thank you, thank you, thankyou. What is a HP guess you could throw at me for my set up.. I think I'll be looking into a 850cfm holly. Do you think I should seperate the 2 carbs on E-Bay or sell them together? Thanks again mr.b |
#8
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The 750 will be acceptable since the limiting engine flow factor is the heads.While the 950HP may show some gains overall the cost is excessive for the gain>I think you should maximize what you have by tuning,nozzel kit(1475) springs rods etc.Ill bet your fuel system is probanly limited anyways so with some effort the 750 will be ok.We run a 830 holley on our 440 drag car and we see little difference if any on the 800/850s.If you want a low buck altrenative go with a 750(4779) mechanical holley with the proform main body which will give a good boost in performance for less money.
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#9
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My old rule of thumb and this usually works....
Warm street type motor...cubic inches X 2= CFM Race Motor....CID X 2 +10CFM for every $1000.00 you spend on hard core goodies=CFM The first case would give you about a 850 Second case would be 440x2=880+60 ($6000 rebuild?)=940 so I would start with a 950 and see what the vacumm gauge say's at the stripe. You could run the 750 but, you would probably pull about 5-10 inches of vacumm at the top end. It won't run lean as this is a fuel/air ratio not a fuel quantity measurement. The key here is to get the car to pull zero vacumm at top RPM under full load, then your just right. My 318 uses a 750 Demon which probably flows at about 800 or better, do the math on that set up....LOL |
#10
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Scarey Movie
Not trying to scare you anything...But, I've done the Hughes convertor deal already....my 318 pumped up their 3500 stall convertor and it pushed the thrust bearings out of my new motor in about 50 passes, cost me $2000 to have it fixed, we caught it in time to save all the hard parts, can you spell D-Y-N-A-M-I-C
We've beaten this convertor thing to death over the last 4 years or so that I've on and off this board, sometimes I wonder if anyone reads this Sh**, Dynamic, A&A(Dynamic rebox) or Turbo Action...Ya Ya I know they cost 7-800$ but a set of bearings will cost you 3 times that much...sell it on Ebay and get a real convertor. |
#11
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Carb?
I don't have a lot of experience with the 440 but for street use, the cam seem too big. The header tubes are too small for anything over 4500 rpm and the carb is close to right if you plan to keep engine speed at 5500/6000. I know a lot of people will disagree. but just thinking out loud. I prefer to swear by something, not at it.
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#12
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This a formula have used in the past and works good.
Cubic inch x Max RPM Example 440x5700 = 250800000 Divided by the constant of 3456= 725.69 cfm A 750 would be fine for this example. Just plug in your numbers to a calculator.Hope this helps. The Grump!!! |
#13
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850 should let that beastie breathe just right
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#14
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let it flow baby
go to www.prestage.com and click on car math. this will give you a ballpark idea and info. on your carb. needs. this is a great web site.
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#15
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6t5, I'm not going to tell you what I think you should put on your motor, since I am still pretty new to the street/strip scene myself. I will only relay my experience with one of the carb choices you listed above-the 800 Edelbrock. My setup at the time was a 451(low deck) with 10.5 comp, Ultradyne solid 251@50/570 lift, MuscleMotors "street killer" 346's, STOCK (not MP) elec distributor, 1 7/8 Hookers, M1 single plane, STOCK converter, 3.91 gear, 28x9 slicks, in my 66 Belvedere. Running the 800 Ebrock right out of the box with NO changes and shifting around 6300, I went 12.5 at 114.2. This was my first time ever at the track and I didnt make any changes between passes(didnt know what to change). The carb was very nice on the street also.
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#16
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Thanks Randy,
You are the first person to bring up the 800 Edelbrock. I honestly love my 750 Edel..No stumbles or sputters whatsoever. I think I'll try the one I have already, and if I need bigger, I'll get bigger. Thanks again, Todd |
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