Racingjunk Forums

Racingjunk Forums (
-   Tuning & Diagnostics (
-   -   Engine loses power after launch (

lodilobo 10-01-2012 03:57 AM

Engine loses power after launch
I'm running a Vega with a 750 h.p. small block with a 1090 Demon carb (96 jets). I use a trans brake, and come out at about 4500 rpm. When the car hooks well, and the front wheels come up, the motor will lose power instantaneously, then regain it....sometimes twice. I have a vent tube from breather to breather on the carb, and the float levels are where they should be. The car is going 9.50's @ 143, but I'm sure I could be in the very low 9's, if this problem goes away. There is really no loss of power or misfiring after the initial launch. Any suggestions?

fast75vega 10-01-2012 04:44 AM

sounds like you need jet extensions in the rear of the carb :wink:

itsabird 10-01-2012 06:06 AM

Originally Posted by fast75vega
sounds like you need jet extensions in the rear of the carb :wink:


lodilobo 10-01-2012 09:03 AM

Already has them.....thanks anyway.

fla1976 10-01-2012 09:23 AM

Possibly a partially clogged fuel filter or weak fuel pump. What size fuel lines?

lodilobo 10-01-2012 10:39 AM

Fuel lines are 10 AN......pump and filter are new...MagnaFuel pump w/ Aeromotive filter. I'm in the process of checking the fuel flow at the carb. That should tell me something. Also.....the regulator is new (Aeromotive). Fuel pressure gauge stays at 7.5 lbs.

TheYellaBrick 10-01-2012 04:01 PM

Might want to check your fuel pickup in the tank....

mopar1968 10-01-2012 04:59 PM

Fuel isn't coming out of the air vent and going down into the engine is it :?:

wrightway 10-01-2012 05:09 PM

Are you running a power valve in the rear?

fast75vega 10-02-2012 03:59 AM

Originally Posted by wrightway
Are you running a power valve in the rear?

that was gonna be my next question too ...... :wink:

All times are GMT -8. The time now is 01:36 AM.