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#833419 - Thu Mar 08 2012 01:26 PM Climbing Hills?
Lucille Online
Shop Shark
Registered: Tue Oct 23 2007 12:00 PM
Posts: 510
Loc: Murphy, NC
I don't like the performance I'm getting climbing hills. When I approach a hill I have to really give Lucille gas to build up speed, however, once I am maybe half way up the hill she starts cutting out on me. I let my foot off the gas slightly and she reacts and catchs up with power a bit, then I give her a little more gas and she'll start cutting out a bit more. It's this back and forth thing we go through. I've got her set to the correct RPM (475 approx), new points, condenser, distributor cap and plugs. Should I be playing with the throttle as I climb a hill? Can someone explain to me the usage of the throttle? Or do I have another obvious problem that I don't understand? This old technology stumps me sometimes. Especially on the performance side of things.
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"Lucille" ..... Proud Member of the "Southern Stovebolts"

David Wolff
1946 Chevy 1/2-ton
In the Gallery
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#833420 - Thu Mar 08 2012 01:31 PM Re: Climbing Hills? [Re: Lucille]
truckernix Offline
Registered: Sun Mar 24 2002 12:00 PM
Posts: 8665
Loc: Bracebridge Ontario Canada
The throttle is used to bring up the idle when it is warming up. I also use mine to set the idle a little higher as a convenience starting on hills. If you engine is running correctly there shoudl be no need to back off the gas pedal on a hill.
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1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
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#833425 - Thu Mar 08 2012 01:47 PM Re: Climbing Hills? [Re: truckernix]
Old 'Burb Lover Offline
Shop Shark
Registered: Tue Apr 04 2006 12:00 PM
Posts: 2753
Loc: Calgary Alberta
Something similar happened to me once. Turned out to be a vacuum leak. After I found the problem and fixed it everything was fine.

I don't know if that's your case, but its something to check into.


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"People sleep easy in their beds because rough men stand ready to do violence on their behalf."
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- Benjamin Franklin
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#833429 - Thu Mar 08 2012 02:08 PM Re: Climbing Hills? [Re: Old 'Burb Lover]
hankrags Offline
Shop Shark
Registered: Fri Dec 11 2009 10:04 PM
Posts: 209
Loc: colorado springs, CO
I would check the fuel filter and fuel pump.
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#833493 - Thu Mar 08 2012 06:19 PM Re: Climbing Hills? [Re: hankrags]
Denny Graham Offline
Extreme Gabster
Registered: Mon Oct 02 2006 12:00 PM
Posts: 10612
Loc: Sandwich, IL
Nope, I can lug my 216 with the Carter W-1 down in fourth gear
to 20 mph on a hill and floor it and it's a steady pull right up
to cruising speed.

DG
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#833519 - Thu Mar 08 2012 07:37 PM Re: Climbing Hills? [Re: Lucille]
Hotrod Lincoln Offline
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 13369
Loc: Dellrose, TN
You mentioned changing everything but plug wires. They're definitely a possibility when dealing with a miss under load. If it's a sharp loss of power, not a gradual loss and a surge back to normal pulling, it's probably ignition, not fuel. Try a new set of plug wires before you chase any more gremlins.
Jerry
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#833665 - Fri Mar 09 2012 08:59 AM Re: Climbing Hills? [Re: Hotrod Lincoln]
Joe H Offline
Shop Shark
Registered: Fri Feb 04 2000 12:00 PM
Posts: 3870
Loc: Lee's Summit Mo. 64086
Mine did that when it was running lean, check float level, fuel supply, and for a vacuum leak. I bet your milage is decent having to let off all the time !

Joe
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1937 Chevrolet Inline-powered Streetrod
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#833758 - Fri Mar 09 2012 03:07 PM Re: Climbing Hills? [Re: Hotrod Lincoln]
Lucille Online
Shop Shark
Registered: Tue Oct 23 2007 12:00 PM
Posts: 510
Loc: Murphy, NC
Jerry, I just installed new ignition wires this morning. I think I may be firing on all cylinders but its hard to tell. Sounds and feels like it. At idle I get these little fart sounds out of the tail pipe like something is a little off. Anyway I took her out and tryed to do Denny's trick of climbing a hill at 20MPH and then accelerating to gain speed. No such luck she still is lacking the power to climb. I got her on level ground and ran her a couple of miles. At one point when I was turning around to come back she back-fired through the carb one time in second gear going really slow. So I thought that it must be the timing. I had her advanced quite a bit, so I retarded her to 4 degrees. Tested her again and kept playing around with the distributor thinking I'll eventually find the sweet spot. It seemed to work the best at about 2 degrees advanced. Still the power is lacking. I'm thinking of removing the vacuum line to see if its gunked up. It's really got me scratching my head. I mean these are basic machines. It shouldn't be that difficult to figure out but I'm really stumped. Any further tests or suggests about where to go next? Was there ever a standard setting to retard the distributor a couple degrees as they came out of the factory? Just curious.
Oh, one other thing. This afternoon when I was out making distributor adjustments, when I would gun her I'd get a whole bunch of back-fire farts out of the exhaust no matter where I set the distibutor. What does that mean?
_________________________
"Lucille" ..... Proud Member of the "Southern Stovebolts"

David Wolff
1946 Chevy 1/2-ton
In the Gallery
http://s1145.photobucket.com/albums/o510/Wolffman26/
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#833792 - Fri Mar 09 2012 06:16 PM Re: Climbing Hills? [Re: Lucille]
don stocker Offline
Shop Shark
Registered: Wed Nov 29 2006 12:00 PM
Posts: 2684
Loc: osceola, wi
Maybe put a vacuum gauge on it and see what it says? Have you adjusted the valves lately? You could always do a compression test and see what it says? The a couple of ideas ......
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#833801 - Fri Mar 09 2012 06:52 PM Re: Climbing Hills? [Re: Lucille]
Hotrod Lincoln Offline
Extreme Gabster
Registered: Mon Feb 23 2004 12:00 PM
Posts: 13369
Loc: Dellrose, TN
If you've got a manual choke, try pulling the knob out a little to create a slightly rich mixture. It's possible the power valve in the carburetor isn't opening up and the drop in manifold vacuum as you go to open throttle is causing a lean-out. Have you checked the fuel volume to see if the pump is delivering enough gas? Disconnect the fuel line at the carb, run the line into a 1-quart catch can, and crank the engine up. It should flow at least a pint in 30 seconds at idle speed, running on the fuel in the float bowl.

Also, try a cylinder balance test, where you run the engine at a constant 1,000-1,200 RPM with a tachometer and a vacuum gauge connected. Disconnect one spark plug wire at a time and record the RPM and vacuum drop for each one. If you've got one with a leaky valve, etc. the RPM and vacuum will not drop as much as a healthy cylinder.
Jerry
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