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| | | | Joined: May 2004 Posts: 1,312 'Bolter | | 'Bolter Joined: May 2004 Posts: 1,312 | Finally got my truck back on the road. Have a few minor tuning issues I could use your suggestions on. Motor is a bored 327 with a mild cam, new Edelbrock 600 cfm carb on a Performer intake manifold, electronic ignition, mechanical fuel pump / fuel pressure reg. set at 6 psi. Starts, idles, and runs good. If I accelerate smoothly, no issues. If I stomp the gas, hesitation & backfire. Also, doesn't like to run a constant speed - ie @ 50 mph, kinda jerky. Thanks in advance ! | | | | | Joined: Dec 2006 Posts: 1,464 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,464 | You could try playing with the timing a little. I use the factory settings only as a baseline, and adjust (usually advance) the timing until you hear a slight ping under hard acceleration then back it off slightly. This takes some trial and error but it'll pay off. | | | | | Joined: Jul 2006 Posts: 232 New Guy | | New Guy Joined: Jul 2006 Posts: 232 | Mine hesitated too, basically the same setup. At the front part of the throttle linkage there is a plunger, it uses a tiny tiny cotter pin to attach the linkage too. Change the linkage so the pump has a longer stroke. Gives a little more gas to the motor when you step on it. Not sure about the surging though. | | | | | Joined: Oct 2006 Posts: 843 Shop Shark | | Shop Shark Joined: Oct 2006 Posts: 843 | Hi Bruce,glad you got it finished.Things that come to my mind.
1/try 10degrees timing
2/the jerking at speed may be fuel starvation,you didn't mention a fuel fiter,the E-brock use an external filter,maybe the one you have is not flowing enough at high speed.Remove it and go for a test run
3/make sure you vacum advance is working
Hope to see you at the next lunch, Boyd | | |
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