Hi to everyone, from the new guy from the great white north! Hope everyone is enjoying their Mopars. It's a hot one this weekend, here in Ontario. I grew up riding in Chrysler cars, and had a few when I was younger. Now close to retirement, I just bought myself an early retirement gift this May. I picked up a 1966 Valiant 2 dr. htp. with 36,000 miles on it, and a 170cid "leaning tower of power" slant six, with a Carter 1 barrel. It spent most of its 52 years indoors, is all steel, and has only been painted once. A survivor. I have a driveability concern though, and wonder if anyone can shed some light on it. On hot days[80+ degrees] while at cruising speed under acceleration, it will intermittently bog out, but as soon as I let up on the throttle, it runs fine. It never stalls, and it sometimes bogs again during the drive, and sometimes not. I haven't had it long enough to pin point the concern due to the changes in our weather up here. The carb was rebuilt last week, and the previous owner replaced the fuel tank and sender, fuel line hoses, fuel filter, intake and exhaust gaskets,distributor overhaul with points and condenser,vacuum lines, rad, ballast resistor,air filter, and other non related parts. [brakes] The fuel pump is the original rebuildable type, and I checked the volume of flow, and it's good. Could it still be the pump,and if so, are rebuild kits available? Maybe a vapor lock? I haven't had a classic car in 35 years, and I've heard that today's fuel could be the problem as well. I sure could use some help.
Thanks.

Enjoy those Mopars!

 

Sounds like you got most of it covered.... I would suggest checking the fuel pressure when driving and see if it falls off. It might be a pressure problem. If all test out good. Then I would say the engine is just not getting enough fuel.
One think you might try is to drop the operating spark plug temperature down a couple steps and see if that helps.

Keep up posted.... And Welcome to the site.. Eh..

 

Welcome from Dorchester near London.

The fuel line running across the front of the engine can pick up a lot of heat. You may want to get a fitting to turn the line up and run it over the valve cover, insulating the existing line near the engine could be done first and see if that corrects the problem.

 

Thanks Coronet 500--since I'm replacing the rebuildable fuel pump [the only original fuel system part left on the car.] with a sealed change up pump, now would be the time to re-route the line.Where the line is currently situated, it will certainly soak up the heat on a hot day. Thanks for the heads up!

BTW-If this doesn't work,and it is a vapor lock issue,what's the cure? Even though the tank is vented in the tank neck, maybe a vented gas cap to add to the venting would help?

 

Insulating carburetor spacer, to stop heat from manifold coming up into carb.

 

Do they make a spacer for a 1 barrel slant six? I didn't think they would, seeing as everyone wants an eight, not a six. I went to cruise night tonight in my hometown, and it was hot and humid, and the old girl ran perfect. She's tempermental, I'll give her that.

 

Anyone in Ontario willing to part with a 1 barrel Carter carb for a 1966 170 slant six Automatic? I was thinking of having one for a spare. [ As long as it's rebuildable.] Also, anyone know where can I get a spacer to go between the carb and intake to minimize the heat transfer?

 

Got it, guys-the bogging issue was the fuel pump! Replaced the original pump, and drove it yesterday in the hot weather, with some family members, for about 4 hours. [not a continuous 4 hours.] It didn't bog once. I guess the old pump was on it's way out after 52 years-makes sense being that old. I'm planning on a trip to the big city in a week, and that will be the real test. [Glad I have CAA, just in case......] Thanks again for all your advice and input, you've all been a great help!

 

Thanks for sharing your triumph in old car repair!!!!👍