Is my carb to big for my race combo?

[mopardude]

I have a 440 -030 over dome pistons 12-1 comp ratio heads flow 300 cfm @ 28" cam is a 625 solid roller with 274 dur @ 050 1.5 rockers mopar m1 intake new style with built in valley pan & dominator adapter with a 1050 carb (9375) older style with non removable air bleeds. I cannot get my car to leave off the line fast its a snail! Car is 2700 # foot brake runs 10.0's at 135 mph 60 foots are BAD 152 to 156 and its not spining ir anything slipping Carb just bogs sorta dosent rev up fast i have 88 jets square with no pvs 35 squirters engine approx hp i think is 600 to 625 hp do u think this carb is the problem for the SLOW 60 foots or just not working correct

[amxauto-x]

With your foot brake sentence I'd guess it to be an auto. So, what stall is the torque converter? What is the rearend gears? What are the rpms when you cross the finish line?
At only 600 hp my first impression is that the carb is too big or the gears are too high [low numaricaly] or the converter is not steep/loose enough.

[mopardude]

yes its an auto 727 trans with 4.33 gears & 32 x 14.5 slicks finish line rpm is 7000 conv in high gear flashes at 4700 when i smash the pedal but like i said either the carb isnt set right or to big so it dont rev fast so i'm sure the conv will flash to 5000 when every thing is working right

[Kevin Garceau]

Your convertor is broke!

Way too man rpms for that combo at the stripe. I run 141 in the qtr, with same gears and tire and run a 727 and only see 6700.
I would be willing to bet its your sprag in the convertor.

[mopardude]

I just put this conv. in! Its used but its doing to exact thing the conv i just pulled out did but that one was looser

[Big Ray]

Usually a bog out of the hole means you need a bigger pump shot. You should check every thing on your carb to see if it is working properly , pump cam ,lever ,linkages,etc. Also what is your total timing.you could need more advance.

Ray

[mopardude]

Its locked out at 38 deg.

[Big Ray]

Your timing should be ok . I'd experiment with pump cams, squirters etc. It's trial and error but this may do the trick,

[Geezer]

I'd be looking at the converter on this one.
My calcs show:
that, using the given MPH, RPM, WT, etc, the engine is making about 520HP, to run the numbers given. [could be at 600, but the verter is wasting 75HP in the form of slip]
Also, the tire size wt, gears, etc, shows the engine rpm should be about 6200, not 7000.
Sounds to me like you are "driving over the converter".
How much RPM drop do you get on the shifts??

Looking at the segments, and working backward, shows:
134.5/10.00 1/4, 6.33 1/8th, 330' 4.06, 60' 1.37.
FWIW, a 1.52 short time relates to a 11.25 @118.
I tend to agree w/ Kevin, I "smell a rat" w/ the converter!!

Just ran another comparo.. Using 2700# and 600HP, the numbers show right on what Kevin is saying 9.62 @ 141...
Food for thought!!!

Back to workin on the HEMI!!

[mopardude]

heres all the info from my time slip

RT .922
60 foot 1.56
330 4.246
1/8 et 6.498
1/8 mph 108.96
ET 10.112
MPH 135.52

What about if the engine isn't running on all 8 clys? I am thinking of it now and i have noticed some times it idles high 1400 or so in park like it did that moring on my way from tec i noticed it was good. Then the rest of the day it was alot lower like 1000 or so rpm Ummmm i think i better start looking at the plugs wires comp., etc. If it wasn't running on all 8 clys woulkd this make the rpm's alot higher at the finish line?

[Kevin Garceau]

His car is not "bogging outta the hole" its not "sputtering or showing a dead spot" .....these are all things that a squiter and pump cam could fix.

His car is not revving up when he leaves the line. I would bet a beer, a nice cold miller lite he has a junk convertor behind it.

If it wasnt running on all cylinders you would have heard it, it would be popping and banging and genuinely driving like shit. You are having way too many rpms at the stripe, if you were on 8 cylinders you would be alot more rpms.

He should be sixtying in the low 1.4s at worse, there is no carb adjustment, timing, phasing, squirt shot, anything else in the world that can slow it up over a tenth besides somethign mechanically wrong. Did you degree the cam?

[mopardude]

yep its in at 102

[cuda66273]

So who's convertor is it???

[mopardude]

Dont know the brand but the one i just pulled out did the same thing!

[cuda66273]

So you put in another unknown convertor and it did'nt make any difference?

Have you done a flash test on the convertor?

What fuel pump are you using?

What size lines?

What Fuel Filter?

Is you fuel line approaching the carb from the rear or is it looped from the front back to the carb?

What pressure reg are you using and where is it set?

What ignition box are you running?

Let's look over these issues first and see if we can get you to a 1.40 or better 60'

[mopardude]

7.5 psi with 2 new holley blues 1/2 line going to a mallory reg thats between the fuel bowls and 1/2 line is going to each bowl its not a lack of fuel its a stone off the line down track is were its making its power i till think the carb is wacky i got it used or its not leaving the line on 8 cyls for some reason

[cuda66273]

"7.5 psi with 2 new holley blues"

How do you have those plumbed in?

"carb is wacky i got it used"
You probably just answered your own question.

Why don't you borrow a carb and try it out, the process of elimination.