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Re: Poor WOT power
LeeD #1341920 Mon Jan 13 2020 06:32 PM
Joined: Nov 2009
Posts: 674
T
Shop Shark
It's probably the carburetor, but I'm going to complicate things a bit.

I suffered the same issue with my '49 216 with Rochester carb. I often run the interstates and keep up with traffic just fine. On hills I just hold the pedal to the floor to squeeze all the power I can get. On one such trip I found I was losing power going up a gentle hill with the pedal to the floor. Not normal. I found that if I let out on the accelerator a bit I would actually gain power. She ran like a little champ, but once the accelerator went past a certain point I'd noticeably lose power.

I gave the old truck a good tune-up and now she runs like a champ again with full power all the way to the floor. I never touched the carb, though.

Re: Poor WOT power
LeeD #1341964 Mon Jan 13 2020 09:27 PM
Joined: Jul 2014
Posts: 223
1
Shop Shark
Check your fuel pump output volume and pressure. Might be the pump, might be the filter or maybe you didn't open the tank valve all the way when you last changed the pump.
With restricted flow, as you get toward the top of the hill, the float bowl gets lower and the mixture gets leaner and the power drops. Yet, unless it's real bad the engine doesn't missfire. It can fool you. Most re-pop pumps aren't very good. I went to an electric pump and it solved a multitude of nettlesome little problems.


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Re: Poor WOT power
LeeD #1342194 Tue Jan 14 2020 10:09 PM
Joined: Mar 2017
Posts: 244
L
LeeD Offline OP
Shop Shark
I switched back to the Rochester so as to rule out anything other than the carb and the acceleration problem went away. No stumbling with large pedal input going up a hill in 3rd gear anyway. I’ll drive it the next few days and see how it does.


1956 Chevy 3200, 235 w/3 speed
Re: Poor WOT power
LeeD #1342261 Wed Jan 15 2020 04:06 AM
Joined: Mar 2010
Posts: 9,385
5
Master Gabster
Yep. Like I always say, "its always the carburetor!" smile smile smile

Re: Poor WOT power
LeeD #1342387 Thu Jan 16 2020 03:00 AM
Joined: Mar 2019
Posts: 945
G
Shop Shark
Its almost never the carb.... Unless its really the carb.. ohwell

Re: Poor WOT power
LeeD #1342425 Thu Jan 16 2020 02:17 PM
Joined: Mar 2017
Posts: 244
L
LeeD Offline OP
Shop Shark
The Rochester has its quirks, and it seems the Carter has its too. I’ll just have to decide which ones I can live with and use that carb. I still think that maybe I have something mal adjusted inside the Carter. I’ll open it up again and triple check the settings and then try it once more.

Lee


1956 Chevy 3200, 235 w/3 speed
Re: Poor WOT power
glenns towing #1342529 Fri Jan 17 2020 03:37 AM
Joined: Mar 2010
Posts: 9,385
5
Master Gabster
Originally Posted by glenns towing
Its almost never the carb.... Unless its really the carb.. ohwell

Either people get me, or they don't. I'm good either way. smile , as long as it prompts them to think for themselves before throwing wheelbarrow loads of parts at their truck.
In the case of OP of this thread, since he had a known-to-be-good carburetor laying around, a simple swap of the carburetor was the smart thing to do.

Re: Poor WOT power
LeeD #1342539 Fri Jan 17 2020 04:43 AM
Joined: Feb 2004
Posts: 20,805
H
Boltergeist
I had a similar issue back in the mid-1960's with a flathead V8 in a 47 Ford coupe. The original Holley 2-barrel for that engine had 15/16" venturis, and I found a carb for a 1955 Ford 292 engine that had 1 1/16" barrels. Since I knew my engine had been bored 80 over by a former owner, I thought the 252 cubic inch engine (up from 239) could handle the extra carburetion. Wrong! at moderate speeds in high gear, I had to modulate the gas pedal very carefully to avoid a flat spot. I could slap it into second gear and get the RPM up, and it would run like a banshee! Ditto for top end, but the midrange in top gear was just not there!


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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