In long corners, I starve my carb

[mazspeed]

I needed to ask this question because of piece of mind. When I was testing my car, we would go into long fast corners, and my engine would die, due to not having enough fuel. I know my float bowls are set a little low, but how can this be fixed? I'm not getting the answers I want to hear (carbs are problems with g forces) and that sort of thing. I should not be stalling the car in or right after I leave a hard corner. Is it just a float level adjustment or something else? The rerason why the floats are low, was because of stopping the car fast would also kill it if I'm on idle, and when the car dies, so does my hydroboost, and that was a saftey issue. The carb shop rebuilt my carb for blower specs. I have a 3/8 inch line for fuel, and a return lie as well. What can we do?

[chicane]

You need to install the correct floats... and probably install jet extensions on the secondaries.

Years ago I had the same issue. One day I just happened to be at GW picking up some parts and remembered that Brad Urbans "Carb Shop" was about 100 yards away. I walked over, talked to Brad, told him my issues and he sent me out the door with a set of road race floats.

http://www.customcarbs.com/carbshopcatalog.htm

I never had any issues with the carb after that.

[mazspeed]

Originally Posted by chicane

You need to install the correct floats... and probably install jet extensions on the secondaries.

Years ago I had the same issue. One day I just happened to be at GW picking up some parts and remembered that Brad Urbans "Carb Shop" was about 100 yards away. I walked over, talked to Brad, told him my issues and he sent me out the door with a set of road race floats.

http://www.customcarbs.com/carbshopcatalog.htm

I never had any issues with the carb after that.

Ok cool. Did this help with stopping fast as well, not killing it at idle? Thanks for the response.

[Spiffav8]

Just to make you feel better....carbs are problems with g forces.

[mazspeed]

Originally Posted by Spiffav8

Just to make you feel better....carbs are problems with g forces.

hehehe not much better.

[chicane]

Originally Posted by mazspeed

Ok cool. Did this help with stopping fast as well, not killing it at idle? Thanks for the response.

Yeah... it sure did.

The problem with the engine during decel is a possibility of one or more things. The first is the vent tubes spilling over into the carb venturi... which is a common problem when you get to 'that' level of braking performance. Next, would be that the engine leans out from the primary jets being uncovered. When the fuel in the bowl climbs the front of the bowl itself, it uncovers the primary jets. Not to forget to mention that if you are using stock floats... it will close the needle and seat too soon and the fuel level in the bowl will be down.

What I did to alleviate myself from these problems is:

Carb Shop floats
0.120 Viton needle and seats, front and rear
Metering plate vents, front and rear
Jet extensions on the secondary main jets
Float adjustment right to the bottom of the threads in the window

Carbs do not have any issue with g-forces... its the idiot that doesn't know how to tune the carb correctly... that has the issues.

The next series of problem's I encountered... was with loss of oil pressure, under braking. The chassis stopped so well that the oil pretty much collected in the timing cover and uncovered the oil pick-up... even when it was run 1.5-2 qts overfull. Lets just hope you dont get there.

[mazspeed]

Originally Posted by chicane

Yeah... it sure did.

The problem with the engine during decel is a possibility of one or more things. The first is the vent tubes spilling over into the carb venturi... which is a common problem when you get to 'that' level of braking performance. Next, would be that the engine leans out from the primary jets being uncovered. When the fuel in the bowl climbs the front of the bowl itself, it uncovers the primary jets. Not to forget to mention that if you are using stock floats... it will close the needle and seat too soon and the fuel level in the bowl will be down.

What I did to alleviate myself from these problems is:

Carb Shop floats
0.120 Viton needle and seats, front and rear
Metering plate vents, front and rear
Jet extensions on the secondary main jets
Float adjustment right to the bottom of the threads in the window

Carbs do not have any issue with g-forces... its the idiot that doesn't know how to tune the carb correctly... that has the issues.

The next series of problem's I encountered... was with loss of oil pressure, under braking. The chassis stopped so well that the oil pretty much collected in the timing cover and uncovered the oil pick-up... even when it was run 1.5-2 qts overfull. Lets just hope you dont get there.

Wow, what great info. Ill forwarded this info to Kevin and the guys at the shop. I will make sure they do this very thing. The carb shop did rebuild the carb, but not sure to what level. I know it cost around $600 so I'm not sure what level that went to and what changes they made. The guys were saying that the car was stopping so fast that the fuel slosh was killing the engine. The car does pull serious g forces in corners and in braking and that's why I have it set up this way, and hate the fact that the carb was limiting what I was doing. Thanks again for this info.

[Blown353]

There is a good chance your dying problem on hard decel is a result of rich-killing it. Does it belch a big black cloud when you restart it?

This is a typical problem with a blowthrough carb and the milled down choke horn. They also usually mill down the vent tubes too... and the now shortened vent tubes don't resist sloshing as easily and under hard braking you slosh fuel out the secondary bowl vent and drown the engine in fuel. If it really spits out a black cloud when you restart it you can pretty much conclude it's fuel slosh out the vents.

My blowthrough carb had the same issue. Take a really hard stop and it would die, and on restart it would absolutely billow black smoke from all the fuel. I re-extended the bowl vents up to almost the very top of my carb hat and the problem went away.

[mazspeed]

I'm not sure if black smoke comes out. I have never checked for it. I do have a taller hat now, so making the vent tubes longer soundsl ike that would work as well.

[Blown353]

Originally Posted by mazspeed

I'm not sure if black smoke comes out. I have never checked for it. I do have a taller hat now, so making the vent tubes longer soundsl ike that would work as well.

Purposely do a hard stop and let it die. Then when you restart it pay attention to the rearview mirror or have someone who can jump out and watch.

If it puffs black it died because it flooded and the cause of your problem is most likely the shortened vent tubes.