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  #91 (permalink)  
Old 02-28-2013, 01:26 AM
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Well i guess the experts are now saying you need a different carb or that it might be a problem, I mentioned a simple cam change (along with some others) to "simplify" the WHOLE combo you have, You have spent 6 pages & haven't done anything tuning related, I will say good luck 2 you!!
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  #92 (permalink)  
Old 02-28-2013, 03:21 AM
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Quote:
Originally Posted by LJM97Z View Post
Well i guess the experts are now saying you need a different carb or that it might be a problem, I mentioned a simple cam change (along with some others) to "simplify" the WHOLE combo you have, You have spent 6 pages & haven't done anything tuning related, I will say good luck 2 you!!
The simple cam change your right.Unless there is something different,as for me,stick a fork in it,I'm done.
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  #93 (permalink)  
Old 02-28-2013, 04:59 AM
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Quote:
Originally Posted by painted jester View Post
http://www.hotrodders.com/forum/atta...1&d=1362026797


This is what your running now? with a little research: Summit is base lining their carbs. with (F)77, (R)79 jetting and a 9.5 PV on the primary side. That 9.5 PV is for a very stock engine!

Jester
I switched it to a 4.5 pv b4 I put it on
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  #94 (permalink)  
Old 02-28-2013, 07:43 AM
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The on the left is 780 CFM 3310-1. The one the right is 750 CFM 3310-2 on up.
Basic Holley Carburetor Information
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  #95 (permalink)  
Old 02-28-2013, 08:18 AM
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Just for the record several of us have bigger cams. WIth 210 cc heads and 246 duration its a good cam for your engine. changing the cam will result in more problems unless you go bigger? I am not sure why everyone is demending you change the cam its just fine the heads are good and the compression is dead on where it needs to be. A little less would have given you more cam choices but now that were here I think you have what you need. Just need to get her dailed in. For some reason ppl think big cams cant run on the street. Most forget that gm made cams with more duration than this one for production street cars. The gm 30 30 solid cam had 254 dur and almost the same lift. WHat made it mild enough fo rhte street was the lobe sep of 114. Yours is much more agressive than this but certainly still streetable.

The comp BMT cam in my vette is much more agressive. it has 243 and 257 dur and 107 lobe sep with a 102 centerline and more lift than your cam. Its not that big. Ppl are just whining about you not asking there permission to build your engine.

For 11:1 I would have gone bigger. Propbably the biggest magnum roller would have been nice. But its all mute now its in and installed. Now you just got to make it work.

Tune it, gear it and maybe add some stall. But your cam does not call for as much as you have already so more may not even work well. But a little more gear will make the car jump and run. But only if the motor is right. If its flat it will give a false feeling of power and make it difficult to track down the problem.

At this point I would not recommend parts swapping. Keep your carb and dizzy until you can nail down the problem. Buying the wrong parts can make things even more costly to resolve in the end. I would recommend trusting a local resource that can get under the hood and help recommend parts he knows he can make work with your unique problems. FYI: I am cheap as ***** and dont take my car any where to get fixed. But in this case I would probably bite down hard and let it get fixed by a pro.
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  #96 (permalink)  
Old 02-28-2013, 11:45 AM
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I'm joining the others who have said adiós. Listening to poor advice might be an expensive lesson- but hopefully you will at least learn something. Good luck.

Last edited by cobalt327; 02-28-2013 at 11:54 AM.
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  #97 (permalink)  
Old 02-28-2013, 12:42 PM
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Originally Posted by 90caprice408 View Post
here are two pics i have in my phone.....car is like 30 miles from me so i don't get to work on her often due to my work schedule
I haven't read the whole thread, but two thoughts based on the pictures:
1. Your lack of pcv can hurt power since the pistons are working against the built up pressure.
2. That is a very aggressive fan to be direct drive. I'd put a clutch on that. Just think how much wind resistance it's causing at just 2000rpm.
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  #98 (permalink)  
Old 02-28-2013, 12:54 PM
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Get back to me when you get around to locking out the distributor.
The rest of the carb tuning is minor and easy, once the distributor is fixed.

Nothing good is going to happen until then.

You can $$$$experiment and parts swap$$$$ all you want, and then finally get to the source of the problem. Or go straight to it. Your choice. Be sure the GM starter motor bracket is installed.
Good luck.
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  #99 (permalink)  
Old 02-28-2013, 01:49 PM
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Can you post a video of the car accelerating. So we can hear the exhaust sound. It can give us a clue of what it's doing.
Also i see you have a pressure reulator. It has one inlet and 2 outlets but it looks as if your carb is single feed. Where does the other line go? Is there a pressure gauge? What's it set to?
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  #100 (permalink)  
Old 02-28-2013, 02:06 PM
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The other line is the return line back to the tank....I have the regulator set at 6psi
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  #101 (permalink)  
Old 02-28-2013, 02:12 PM
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Quote:
Originally Posted by 90caprice408 View Post
The other line is the return line back to the tank....I have the regulator set at 6psi
Cap the return line and see what happens. I dont think it's meant to have a return, especially if you're running a mechanical pump. I have the same style regulator and i plugged the other outlet. You might not be getting enough fuel.
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  #102 (permalink)  
Old 02-28-2013, 02:24 PM
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He's not running the Holley in the pic he posted hes running the summit carb now!! Like the discontinued Holley 4110

http://www.hotrodders.com/forum/atta...1&d=1362086660

Jester
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  #103 (permalink)  
Old 02-28-2013, 03:01 PM
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Quote:
Originally Posted by bigdog7373 View Post
Cap the return line and see what happens. I dont think it's meant to have a return, especially if you're running a mechanical pump. I have the same style regulator and i plugged the other outlet. You might not be getting enough fuel.
I'm not running a mechanical fuel pump....the car came equipped with tbi so I am using the electric fuel pump that came with the car
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  #104 (permalink)  
Old 02-28-2013, 04:17 PM
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The factory TBI in tank pump does not have enough flow capacity to feed that 406 @ WOT

The engine will starve for fuel at high rpm. Potential engine damage from detonation (leanout)
The regulator will never keep up to this high pressure EFI pump.
It will either consistantly tend to flood the carb and or starve the motor at high rpm. Or both.

It has pressure but not enough flow volume capacity.

Get a in line electric like a carter P4594 and get rid if the in tank pump. And the sock filter in the tank.
flair the end of the in tank fuel pick up tube (3/8" minimum size).
No regulator is required. 3/8" fuel line minimum inside diameter of fuel fittings 1/4". 3/8" in out in line fuel filter. (get a new one)

Last edited by F-BIRD'88; 02-28-2013 at 04:22 PM.
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  #105 (permalink)  
Old 02-28-2013, 05:09 PM
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Never thought of that...
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