Need Carb Help
Ask anyone who's done a s10 v8 swap or owned a 4.0 powered jeep xj and they'll tell you the same thing. Airflow AFTER the radiator matters and you have very little of it.
Did compression test last night. All cylinders were 210-215 psi
The QF did not care for the orifice style PCV (the previous holley didn't care?). Once we put a vacuum style PCV in line, we then needed a different power valve. Those changes allowed for the carb to be tuned and driveability was great.
Still had the issue of running hotter than I would like and once it was warm, diesel on shutdown. Ended up installing a solenoid on the throttle so the blades would close completely at shutdown.
The truck still runs warmer than I think it should , but it has zero driveability issues. I have too many other projects right now to care that its not 100% perfect.
Still had the issue of running hotter than I would like and once it was warm, diesel on shutdown. Ended up installing a solenoid on the throttle so the blades would close completely at shutdown.
The truck still runs warmer than I think it should , but it has zero driveability issues. I have too many other projects right now to care that its not 100% perfect.
Teching In
Joined: Dec 2012
Posts: 44
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The QF did not care for the orifice style PCV (the previous holley didn't care?). Once we put a vacuum style PCV in line, we then needed a different power valve. Those changes allowed for the carb to be tuned and driveability was great.
Still had the issue of running hotter than I would like and once it was warm, diesel on shutdown. Ended up installing a solenoid on the throttle so the blades would close completely at shutdown.
The truck still runs warmer than I think it should , but it has zero driveability issues. I have too many other projects right now to care that its not 100% perfect.
Still had the issue of running hotter than I would like and once it was warm, diesel on shutdown. Ended up installing a solenoid on the throttle so the blades would close completely at shutdown.
The truck still runs warmer than I think it should , but it has zero driveability issues. I have too many other projects right now to care that its not 100% perfect.
I can't get my idle down without closing the throttle blades completely, which causes a horrible part throttle drive.
I have lowered the timing to almost 0 which causes engine to heat up at idle, I have also switched from the orifice type pcv to the standard type, I have even blocked off the vacuum line completely, and disconnected all vacuum accessories, and checked for vacuum leaks, all to no avail.
I am running a iron block ls1, 5.3 bored to 3.89, stock 2000 ls1 cam 735 quick fuel carb, vacuum secondaries.
Teching In
Joined: Dec 2012
Posts: 44
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Edelbrock 71187 performer, and I know about the screw hole in the intake runner, I even went back and sealed the threads with sealer.
Would a single plane intake make a difference?
What about an open spacer? If the engine was pulling in air and fuel from all 4 barrels would that reduce some velocity? And or vacuum? Currently about 20 inches of vacuum.
Would a single plane intake make a difference?
What about an open spacer? If the engine was pulling in air and fuel from all 4 barrels would that reduce some velocity? And or vacuum? Currently about 20 inches of vacuum.
Edelbrock 71187 performer, and I know about the screw hole in the intake runner, I even went back and sealed the threads with sealer.
Would a single plane intake make a difference?
What about an open spacer? If the engine was pulling in air and fuel from all 4 barrels would that reduce some velocity? And or vacuum? Currently about 20 inches of vacuum.
Would a single plane intake make a difference?
What about an open spacer? If the engine was pulling in air and fuel from all 4 barrels would that reduce some velocity? And or vacuum? Currently about 20 inches of vacuum.
What is the current power valve size?
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Joined: Dec 2012
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Carb is brand new quick fuel 735 cfm
I had a used 650 road demon on it first, and I just knew that it was causing all my problems, $535.00 later, still the same!
Maybe a cam change? I don't know I am not giving up yet, engine runs great, just idles like crap.
Wish I was more of a guru on this, but Im not. With that much vacuum, I wouldn't be worried about the cam.
I ended up using professional assistance to get mine sorted. It was cheap and quick! If you are near Houston, let me know and I will point you towards the man.
I ended up using professional assistance to get mine sorted. It was cheap and quick! If you are near Houston, let me know and I will point you towards the man.
Teching In
Joined: Dec 2012
Posts: 44
Likes: 0
I am in Atlanta area, to be more specific, I am 5 miles from summit racing in McDonough GA.
