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Joined: Sep 2006
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Backyard Mechanic
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OP
Backyard Mechanic
Joined: Sep 2006
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My '52 has a 235ci w/dual intake manifold. At a steady speed, 30 to 40 mph, I get a severe "bucking" from the engine. Same thing if I take my foot off the accelerator and let it idle down. Runs great under any acceleration. Obviously carb problem. Tried different jets; #58's run too rich so I tried #51's which seem too lean. I've tried '52 carbs w/auto chokes and now have '51's with manual chokes, all with the same problem. I know duals reduce the manifold pressure somewhat but I don't think that's the problem.
I hope this is a problem someone else has dealt with and resolved. 'could sure use some suggestions.
52Conv
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Joined: Dec 2013
Posts: 388
Backyard Mechanic
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Backyard Mechanic
Joined: Dec 2013
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What is your timing set at? sounds like a lean problem and/ or timing to me
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
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sounds as if you have a major vacuum leak.
I would suspect in the manifold to head area.
Last edited by Chev Nut; 08/27/14 02:41 PM.
Gene Schneider
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Feb 2008
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ChatMaster - 3,000
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ChatMaster - 3,000
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If you check for vacuum leaks, use the UNLIT propane torch, , check head to intake, carb to intake, as stated. If leak is discovered, RPM will increase with propane. Much cleaner and easier to check with propane, instead of sprays, water, etc.
1951 Chevy Styleline Deluxe 2 door sedan / purchased from second owner 6-19-2000.
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Joined: Sep 2006
Posts: 206
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Sep 2006
Posts: 206 |
Good suggestions. I'll give it the "propane" test in the morning!
Gene
52Conv
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
Joined: Nov 2001
Posts: 29,863 |
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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