Hesitation - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
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post #1 of 7 (permalink) Old Feb 18th, 03, 02:20 PM Thread Starter
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I recently finished my 355 for my 69 Camaro. 10:1 compreesion, 202 heads, solid sig cam 510 lift 286 duration. edlebrook manifold, muncie 4 speed, 411 rear end. I have a 650 vac sec. holley on it. setting still at idle it sounds awesome and rev's great, But when driving it while letting out the clutch the engine hesitates real bad. Now I know it would be nice to put a new engine together and it run great right from the start. But I suck at tuning, Is the carb to small ? or carb just needs tuning. Timing is at 10 to 12 btdc, seems to run better advanced. What do I do ? Tony
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post #2 of 7 (permalink) Old Feb 18th, 03, 06:40 PM
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Wow, your combo sounds almost like mine, except I have a Th350. Anyway mine hesitates as well. I have a 650cfm (holley HP), which is the right size carb for a 350 in that cams rpm range. Theres a formula CFM= (CID X Max. RPM)/3456 and for a 350 @6500rpm it yields about 658cfm. I suck at tuning also, but I have had several engine builders and perf. shop people look at it, and they say I'm running lean!?! I havn't had time to correct the problem but that's were I'm going to go with it. You might want to adjust your floats and idle mixture screws too, as this greatly helped my stumble. If you mess with your idle mixture srews, then your going to have to reset your timing. Hope that helps
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post #3 of 7 (permalink) Old Feb 18th, 03, 08:12 PM
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Clayjames, you said your engine revs good? So it only hesitates under load? What size Jets are you running? It does sound like your fuel mixture is too lean. You should be running between .68 or .72 jets with that cam. Now if it only hesitates when you really get on the throttle, it could be your secondary spring is to strong for the amount of vacuum produced.. So the secondaries are not kicking in when the engine needs more fuel and air, so you would need to get a lighter spring. Its pretty easy you can figure it out.

Anyone else agree? I donít claim to be an expert.

-John
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post #4 of 7 (permalink) Old Feb 19th, 03, 01:35 PM Thread Starter
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Thank You Toad and 67 electro for your response!! I love this web sight. Alot of my friends are into newer cars like mustangs and foriegn crap. Now in my forties I am still into old muscle cars and have had a 69 SS camaro since high school and I am keeping my 11 year old son into the same. So coming to this web sight to get help from other camaro lovers has been great. 67electro you said I sould have 68 to 72 jets, did you mean in the front metering block, the back metering block has that pre jetted block. I was going to take my 780 holley off my 454 in my boat and try it on my small block, would that be to much fuel. People say you can wash out the rings Im not sure thats true or not.
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post #5 of 7 (permalink) Old Feb 19th, 03, 03:39 PM
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Probably could use richer jets in the primary and/or a little work on the accelerator pump. Start there and report back. [img]smile.gif[/img]

-Mark.
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post #6 of 7 (permalink) Old Feb 19th, 03, 05:34 PM
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I was referring to your primary (front metering block) I donít have much experience messing with the secondary metering block, because I have a pre jetted secondary metering block as well. And I donít think the stock non-adj metering block would cause that, I believe they switch it out for fine-tuning to squeeze more power from it. Not really to fight a hesitation. I have a 350, Comp Extreme Energy 268, Vortec Heads, Edelbrock Performer RPM intake, Holly 750 Vacuum Sec, with 68 jets and it runs great. Also make sure your timing is set rightÖ mine runs great at 12 BTDC.

-John
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post #7 of 7 (permalink) Old Feb 20th, 03, 02:32 PM Thread Starter
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Thank You guys for the suggestions !! I will try them all and report back to let you know how it goes.
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