RE: [Chrysler300] 375 Troubled Horses

[christopher beilby <thelastbestgenius@xxxxxxxxxxx>]

Sounds like float level too high, and/or, maybe if new fuel pump at same time, the pump pressure is too high for the float needle/seat to hold floats at correct level?  But first I'd check float levels - usually with many carbs, if you tip the top of carb upside down, the floats should sit parallel with the removed upside down top carb surface when the floats are set right - this is a very rough first guide before you go the what the actual carb float specs are.
 
Christopher in Australia 
ps rebuilt cars can sometimes/often be bitches until all early rebuild gremlins are sorted
 



To: Chrysler300@xxxxxxxxxxxxxxx
From: kboonstra@xxxxxxxxxxxx
Date: Thu, 11 Aug 2011 14:21:21 +0000
Subject: [Chrysler300] 375 Troubled Horses


  



Would someone who knows a whole lot more than I do about WCFB carburetors try to help me out? The car is a '57 300C.

Basically what I've got happening on my freshly rebuilt carbs is that I can't get the engine to idle without flooding out. I've tried to follow the book and set the idle mix and air mix screws on both carbs at 1 turn out. Then I followed another expert's advice to put them all at 1-1/2 turns out, and yet another recommendation I heard which said you should close the idle circuit screws on the forward carb completely and set up the idle on only the rear carb.

I've spent hours tinkering, but no matter what I have done the engine always dies when I let off the throttle below something like 700 rpm. The only way I can then restart the warm engine is to hold the throttle wide open while cranking until the manifold clears after about 20 seconds of grinding. The engine then gradually struggles and coughs back to life. There's so much fuel in the manifold when it dies that I have to keep the the air cleaners on during restarting just to keep flames from licking out of the tops of my carbs. I've learned to keep a towel handy to put the fires out.

When the above attempts did nothing to help the flooding, I shut down the idle mixture and air mix screws on the front carb, and then tried turning in the rear carb mixture screws until they were all but closed while opening the air mix screw as far as 2-1/2 turns. But no matter what I do the engine always quits and the manifold always loads with fuel. And BTW, I can't blame the fuel octane as I'm using 100LL aviation fuel for the setup.

I'm pretty green when it comes to carburetor tweaking so I'm really baffled as to where to look next for the solution. Why is it running so rich? The choke plate is wide open with the engine warmed up to operating temp, and yet I have to go wide open on the throttle during the cranking to clear it out before it will run. And even then it doesn't run very well.

And here's my rant. I REALLY want to hit the road a bit with this car, but it's fighting me every step of the way. I've only gotten to rack up 10 fitful miles so far since the restoration. I've had to track down and fix leaks of every single fluid the car has, even though everything has been rebuilt - gas, engine oil, coolant, brake fluid, transmission oil, PS fluid - along with any other problem you can imagine. It drove me nuts. The only things that haven't leaked are the tires and the battery. So after getting all these issues fixed, I really didn't need a carburetor problem on top of it all.

Well anyway, where do I look next? Float levels or or incorrect jets or something else? Shall I limp it over to my engine builder who does a lot of carbureted engines - including race engines? They claim to have some "tricks" they know how to perform on the WCFBs. What else can I do?

HELP !!!!!!!!!!!!!!!!!!!!!!!!

Thanks.
Keith Boonstra




 		 	   		  

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