TylerW
New Member
Hey all:
I've had a long-term issue with the carburetor on my '66 300 383, which is the original 4131S. It works perfectly "most" of the time, but it appears to run out of fuel when I am in the secondaries. I don't drive this car hard but there are times when I need the power(and other times I just like hearing the 4bbl kick in lol). I get about 2 seconds of full power, then it starts losing power. If I keep my foot in it, it will level off about 70mph.
However... I conducted an experiment and disconnected the linkage to the secondaries and went for a drive. Running on 2bbl only it will wind out each gear with no starvation. BTW it's a fairly fresh engine...not trying to push an original engine that hard.
Here is what I have done. Part of this was related to getting the car back on the road 4 years ago:
New fuel tank and sending unit
New fuel line
New Carter fuel pump
New hardened fuel pump pushrod from Mancini(the old one was fine)
New line to the carb
New fuel filter
Rebuilt carb twice, blew all the passages out, set the float height by the book
Rebuilt the distributor and installed a Pertronix unit and matching coil
Modified a stock ballast to provide full voltage to the coil
New plugs, cap and wires
I'm at my wit's end with this thing. That carb is simple...I don't know what I could have missed or the issue is elsewhere.. As I said it runs perfectly otherwise except that it dries up after sitting a few days, and it is VERY prone to heat soak in the summertime. Maybe those are clues? Thanks for any advice.
I've had a long-term issue with the carburetor on my '66 300 383, which is the original 4131S. It works perfectly "most" of the time, but it appears to run out of fuel when I am in the secondaries. I don't drive this car hard but there are times when I need the power(and other times I just like hearing the 4bbl kick in lol). I get about 2 seconds of full power, then it starts losing power. If I keep my foot in it, it will level off about 70mph.
However... I conducted an experiment and disconnected the linkage to the secondaries and went for a drive. Running on 2bbl only it will wind out each gear with no starvation. BTW it's a fairly fresh engine...not trying to push an original engine that hard.
Here is what I have done. Part of this was related to getting the car back on the road 4 years ago:
New fuel tank and sending unit
New fuel line
New Carter fuel pump
New hardened fuel pump pushrod from Mancini(the old one was fine)
New line to the carb
New fuel filter
Rebuilt carb twice, blew all the passages out, set the float height by the book
Rebuilt the distributor and installed a Pertronix unit and matching coil
Modified a stock ballast to provide full voltage to the coil
New plugs, cap and wires
I'm at my wit's end with this thing. That carb is simple...I don't know what I could have missed or the issue is elsewhere.. As I said it runs perfectly otherwise except that it dries up after sitting a few days, and it is VERY prone to heat soak in the summertime. Maybe those are clues? Thanks for any advice.