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#67562 10/21/2006 9:27 PM | Joined: Aug 2006 Posts: 31 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2006 Posts: 31 | Just installed used 261 in my 1953 Chev. 3/4--runs at 1500-2000 RPM, but can't get the darn thing to idle.
Has one 2-bbl carb., new fuel pump--
Any suggestions? | | |
#67563 10/21/2006 9:31 PM | Joined: Nov 2005 Posts: 6,061 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,061 | Hy tk261, check for a vacuum leak, hope that helps. | | |
#67564 10/22/2006 1:22 AM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | tk261,
A fast trick...remove air cleaner, start engine and hold at 1500 RPM or so. Peg throttle WOT and slam hand over carburetor hard and hold it there until the rig dies.
Wait a few minutes and start the (flooded) truck. If anything was lurking in the idle circuit, like water, it is long gone.
Stuart | | |
#67565 10/24/2006 6:57 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | What carburator are you trying to use? 261's came with a 1bbl Rochester originally. The carburator may not have the right idle circuit for the 261.
Also make sure you are getting ported vacuum for the vacuum advance. If you have full spark advance at idle you will not be able to dial it in right.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
#67566 10/24/2006 1:22 PM | Joined: Nov 2002 Posts: 2,715 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,715 | Another consideration to go along with the one mentioned by Josiah - how is the intake manifold modified to use the two-barrel. The one barrel to two barrel adapters typically cause idle and low end issues.
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 | | |
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