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-   -   Huge bog at 3k (http://www.hotrodders.com/forum/huge-bog-3k-192640.html)

prettyboyced 02-14-2011 12:11 PM

Huge bog at 3k
 
I have a 350 l98 heads 270 comp cam 600 edelbrock carb 1405 and if I'm driving at wot around 3-4k i have this huge bog feels like it's running out of gas but it only happens in 2nd and 3rd gear my timing is set at 34 total and the only mods I did to the carb was change primary rods and accel pump

Mertz 02-14-2011 12:23 PM

I had the same problem. Check to see if the fuel filter is plugged. It sounds like it is not getting enough gas at the higher RPMS. I just fixed the same problem. It could also be that the gas tank is not vented and keeping from letting enough fuel to the carb. Like they always say on this forum, check the easy stuff first.

cobalt327 02-14-2011 12:26 PM

Quote:

Originally Posted by prettyboyced
I have a 350 l98 heads 270 comp cam 600 edelbrock carb 1405 and if I'm driving at wot around 3-4k i have this huge bog feels like it's running out of gas but it only happens in 2nd and 3rd gear my timing is set at 34 total and the only mods I did to the carb was change primary rods and accel pump

After the bog, how does it run? Strong on out to red line, or not so much.

Does the bog coincide w/the secondaries opening, OR the step up springs lifting the needles? The springs are related to the engine vacuum, so you'll be able to tell if you can set up a vacuum gauge that can be easily seen from the cockpit, or preferably read by a passenger.

prettyboyced 02-15-2011 02:01 AM

Changed fuel filter no difference and I cant get past the bog it feel like it running out of gas and it's way in the secondaries by then

prettyboyced 02-16-2011 09:43 PM

I changed the sec jets from .95 to .98 and nothing changed but I noticed if I keep my foot in my rpms go down and it stalls

hammernpunch 02-16-2011 10:16 PM

reply to blog at 3k
 
kinda sounds to me like the floats might need checked, or maybe a bad gas line letting the pump suck up some air, especially if the tank is full. if you low on gas, the fuel could be sloshing away from the pick up in the tank. thats all i could think of right now. good luck!

prettyboyced 02-19-2011 11:17 AM

I'm thinking can it be my fuel pump not giving me enough volume I have a mr gasket fuel pump and I have around 350 hp so I'm thinking the only reason it's not doing it in first is because the bowls are already full and it's doing it in sec and 3rd it because the fuel pump can't keep up

carsavvycook 02-19-2011 12:18 PM

Quote:

Originally Posted by prettyboyced
I'm thinking can it be my fuel pump not giving me enough volume I have a mr gasket fuel pump and I have around 350 hp so I'm thinking the only reason it's not doing it in first is because the bowls are already full and it's doing it in sec and 3rd it because the fuel pump can't keep up

It could be the fuel pump lobe on the camshaft is worn. Thus not pushing the fuel pump lever enough.

prettyboyced 02-19-2011 12:35 PM

It's a eletric fuel pump

cobalt327 02-19-2011 12:44 PM

You might try using an Edelbrock p/n 1466 high flow 0.110 viton needle and seal assembly to fit the Edelbrock/Carter carbs.

More: HERE.

prettyboyced 02-19-2011 12:46 PM

What are they use for I don't understand

355ci 02-19-2011 01:00 PM

Where and how is your pump mounted? most electric pumps dont like to pull fuel. they push it. they like to be mounted lower then the fuel tank.they like big fuel lines and free flowing filters. I used off the shelf electric pumps all the way up to a holly black. I personaly could never get it just right.They would all ran good until they got hot. I got a $100 mechanical edelbrock victor racing pump #1711 no more promblems. 355 sbc about 375-400hp
shifting @ 6200rpm

prettyboyced 02-19-2011 01:10 PM

It's mounted in the front of the motor so where should I mounted

355ci 02-19-2011 01:22 PM

what kind of electric pump is it? are u running stock lines? are u running a return? find some where under the car as close to the tank as possible to bolt it to the chassis. mount it with rubber shock absorbers lower then the tank. 1 filter before the pump 1 before the carb. At your power level a mechanical pump would be sooooo much easier. almost bolt and go

cobalt327 02-19-2011 01:30 PM

Quote:

Originally Posted by prettyboyced
It's mounted in the front of the motor so where should I mounted

Electric pumps generally speaking are much more efficient at PUSHING fuel, rather than pulling fuel.

You want to mount the pump at or below the fuel level, as near to the tank as practical.

The high flow needle/seat goes inside the carb.


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