Engine dies round bends and under hard braking
Thread Starter
Burning Brakes
Joined: Jan 2009
Posts: 845
Likes: 54
From: Bangor, Northern Ireland
Engine dies round bends and under hard braking
Hi, my '71 small block Vette dies under hard braking and cornering, it has an Edelbrock performer RPM top end package, a new-ish holley mechanical fuel pump and the fuel lines are good with good fuel pressure, the car is a pro tourer and i like to throw her around
it seems most noticable round right hand turns and is really annoying!
my friend reckons all 4bbl carbs do this, do they? if that were true then no one could circuit race a 4bbl car, i don't believe this, but i don't want to spend out on a new carb if it won't solve it
Could it be the bowls? fuel tank?
if so any recommendations on an upgrade for my Edelbrock carb, and is it worth it?
Thanks guys.
Aaron
it seems most noticable round right hand turns and is really annoying!
my friend reckons all 4bbl carbs do this, do they? if that were true then no one could circuit race a 4bbl car, i don't believe this, but i don't want to spend out on a new carb if it won't solve it
Could it be the bowls? fuel tank?
if so any recommendations on an upgrade for my Edelbrock carb, and is it worth it?
Thanks guys.
Aaron
Last edited by aaroncorvette; May 23, 2009 at 05:40 PM.
Melting Slicks
Joined: Sep 2007
Posts: 2,429
Likes: 0
From: Tucson AZ
What are the "good" fuel pressures?
Is there a spot in the fuel line that has a small kink in it?
Is it close to the exhaust?
Is it a new carb, or a rebuilt?
Are the floats set correctly?
I'm out for now, I'll check back,
BBTank
Is there a spot in the fuel line that has a small kink in it?
Is it close to the exhaust?
Is it a new carb, or a rebuilt?
Are the floats set correctly?
I'm out for now, I'll check back,
BBTank
Thread Starter
Burning Brakes
Joined: Jan 2009
Posts: 845
Likes: 54
From: Bangor, Northern Ireland
Getting around 7psi pressure, i've just rebuilt the engine (not running yet) this was a previous problem that i'd like to sort out, is fine under hard acceleration
Carb was new approx 5k ago
My main question is 'should my carb be able to handle the g's of a VBP equipped Vette or should i expect this from a mid range carb'
if the responses are along the lines of get a Holley Hp or Demon etc for fast road then i'll do it, i don't want to waste time on parts which aren't up to the job
I'll check the float levels tomorrow, just trying to get a general concensus
Carb was new approx 5k ago
My main question is 'should my carb be able to handle the g's of a VBP equipped Vette or should i expect this from a mid range carb'
if the responses are along the lines of get a Holley Hp or Demon etc for fast road then i'll do it, i don't want to waste time on parts which aren't up to the job
I'll check the float levels tomorrow, just trying to get a general concensus
Last edited by aaroncorvette; May 23, 2009 at 05:42 PM.
Team Owner
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
Getting around 7psi pressure, i've just rebuilt the engine (not running yet) this was a previous problem that i'd like to sort out
Carb was new approx 5k ago
My main question is 'should my carb be able to handle the g's of a VBP equipped Vette or should i expect this from a mid range carb'
if the responses are along the lines of get a Holley Hp or Demon etc for fast road then i'll do it, i don't want to waste time on parts which aren't up to the job
Carb was new approx 5k ago
My main question is 'should my carb be able to handle the g's of a VBP equipped Vette or should i expect this from a mid range carb'
if the responses are along the lines of get a Holley Hp or Demon etc for fast road then i'll do it, i don't want to waste time on parts which aren't up to the job
Something is wrong.
Thread Starter
Burning Brakes
Joined: Jan 2009
Posts: 845
Likes: 54
From: Bangor, Northern Ireland
Thats what i've been thinking, once i get it running again (should be in the next day or so) i'll take her out a get a better idea
Thanks guys, keep the opinions coming
Thanks guys, keep the opinions coming
Team Owner
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
Stumble would point to fuel level, too high or low
Quick would be wires, short electrical
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Michael S. Palmer
Senior Member since 1492
Joined: Aug 2000
Posts: 87,955
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From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
My old 350 w/ Edlebrock carb would do that, even at stop signs. Turned out to be a float adjustment.. it was set too low.
Racer
Joined: Dec 2007
Posts: 342
Likes: 29
From: vancouver washington
I've read GM discontinued Carter AFB carbs for this very reason(eldlebrock clone) back in the 70s. My 600cfm edle works great but I dont autocross or run road coarse tracks. I've read lotsa of guys with the same problem , the stumble on hard brakeing and cornering
Thread Starter
Burning Brakes
Joined: Jan 2009
Posts: 845
Likes: 54
From: Bangor, Northern Ireland
The Edelbrock is an old style carb which is why i'm thinking about a more modern carb, was looking at the holley HP's, my mate raves about Barry Grant carbs, any thoughts?
I will adjust the float level first though, haven't done it before, is it easy?
I will adjust the float level first though, haven't done it before, is it easy?
Drifting
Joined: Feb 2005
Posts: 1,879
Likes: 38
From: Los Gatos CA
AFB's are known for fuel starvation under hard cornering. At the risk of sounding repetitive, a Qjet is a better all around carb. And they are hard to beat for driveability with their small primaries. If you get your hands on one of those Edel Qjets you will never let go... Just my 2 cents.
....before you waste your money.
Senior Member since 1492
Joined: Aug 2000
Posts: 87,955
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From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
