Posted by DR. EVIL on May 06, 2020 at 06:28:31 from (174.192.65.8):
In Reply to: Old wives tales? posted by olddog on May 06, 2020 at 04:14:39:
Yep, as the others have said, vapor lock is real. I suspect the flathead V-8's would vapor lock. I know for a fact the Y-block engines could do it even on a comfortable day, 272,292,312 V-8's. Dad had a '56 F-350 single rear wheel pickup with 292 & 4-speed. It could carry as much as any 3/4 ton Chevy, plus tow our Heider augerwagon with 5000# of ground hog feed and still pass the Chevy about a mile north of town. Problem was the exhaust cross over pipe from left exh manifold to right side manifold passed within less than a half inch of the fuel line between the fuel pump and carb. Slowing down to turn onto our road was enough to vapor lock the engine. On lucky days there would be accumulated rain water in the ditch to trickle on the fuel line, fuel pump, maybe even the carb. While cooling the beast off, the Chevy would drive by slowly, sometimes stop and ask if we needed help. Nope, just time with the hood up. A full dual exhaust would have ended the problem. When we cleaned the shop out when we moved I found 4-5 nearly new carbs and fuel pumps, even a couple wraps of aluminum foil would have helped. About 8-10 years later I'm driving our township road depot's '59 F-750 spreader truck in the next township west, as the day got hotter the vapor lock on it got worse, a low gear and high rpm were the only cure that day. Pop the hood and the engine looked exactly like Dad's F-350. My farm tractor experience is mostly with FARMALL'S, M,H, 450, never had one vapor lock, now a 2 cyl Deere I can see vapor locking, neighbor's WD-45 Allis, D-17 & D-19 never vapor locked either. Thing the Allis's and FARMALL'S had in common, gas tank away from engine heat, carb in air blast from fan out in the open. My '78 F-150 with 300-6 had exactly the OPPOSITE problem. I picked my Buddy up one Saturday morning in January, was about 10-12 Below, drove about 60-70 miles and my buddy had to have me stop, relieve his bladder and get another cup of coffee. Temp guage showed truck was up to temp, pulled up to stop sign on exit ramp and the thermostatic coil spring has the fast idle cam activated and truck idling 2000 rpm, about 50 mph. A vinyl home-made winterfront, a cold air shroud around the carb and automatic choke, and the automatic choke would actually turn off. I also converted to a manual choke. Think I got about 6-7 mpg on that trip that morning, not my usual 12-14. My '74 Chevy LUV by Izuzu had a manual choke, but was a rotting rusting piece of junk otherwise. And it never idled fast like that. But in order to start at 10 below I had to hook up battery charger AND plug in the block heater and starting was still "Iffy" below zero. Had to drive the first mile in low gear, the manual 4 spd trans wouldn't shift, UNTIL I put IH Hy-Tran in it.
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