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| | | | Joined: Dec 2006 Posts: 26 New Guy | | New Guy Joined: Dec 2006 Posts: 26 | Hello all, have been enjoying the posts but have not been able to work on my truck for a while. Finally got enough parts together to fire up my 383 sbc yesterday! Engine was built for a bracket racing car but I was assured in would be a streetable engine. I also purchased an Edelbrock tripower set up with early 2 barrel Rochesters, both guys said they would be around when I started it up. Fast forward 3 years, both guys are no longer in the area and I am trying to make this thing run. Engine cranked and fired right away on the center carb only. Got the timing set, adjusted the float for a slight flooding issue and went to adjust the idle mixture screws. From what I have read you start at 3 turns out and adjust to 2 to 1 1/2 turns. This thing wont even try to idle unless I am out 3 1/2 turns. The cam in this thing is a thumper, I dont think It wants to idle at less that 1000 RPM. Do the idle screws adjust fuel? is it OK to run them out for a high idle? I am currently using the choke cam to set the linkage up so it idles at 1000 RPM. Any input would be great. Thanks Boltbuster
Last edited by Boltbuster; 07/05/2012 10:35 PM.
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | If you have to run the idle jets rich like that you probably have a vacuum leak or your side carbs throttles are not closeing tight. Sounds like you have too much cam. Set the initial timing to about 12-14 degrees. Get a vacuum advance that comnes in at a low vacuum & hook the vacuum line to manifold vacuum.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Nov 2002 Posts: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 |
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Dec 2006 Posts: 26 New Guy | | New Guy Joined: Dec 2006 Posts: 26 | Thanks Guys! The carb shop stuff is very helpfull. I sealed off the inlets to the out board carbs and got the idle adjusted pretty well. Only 6 lbs of vac. at 850 RPM, the cam is real lumpy. I drove it for the first time tonight, it runs pretty good! Got to sort out the steering and brakes. Thanks again | | | | | Joined: Nov 2002 Posts: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 | Thanks Guys! The carb shop stuff is very helpfull. I sealed off the inlets to the out board carbs and got the idle adjusted pretty well. Only 6 lbs of vac. at 850 RPM, the cam is real lumpy. I drove it for the first time tonight, it runs pretty good! Got to sort out the steering and brakes. Thanks again If you meant 6 inches of mercury at 850 RPM, I would highly suggest borrowing another vacuum gauge for comparison purposes! Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Feb 2004 Posts: 29,780 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,780 | I'm tempted to give you the same advice the lady who had the 2-headed baby got- - - - -"You grew it, it's up to you to love it!" Any street engine with that much cam is going to be as irritating as a sandpaper girdle! Tripower carbs will simply add to the aggravation.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Dec 2006 Posts: 26 New Guy | | New Guy Joined: Dec 2006 Posts: 26 | That is soooo true Hotrod! I am sure I will be installing a milder cam at some point. Fixed a couple of leaks and alinged the front end a bit more and took it out on the road. It pulls like a mule, 20 years ago I would have been grinning ear to ear but I am sure it will get old. Thanks for the input. | | |
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