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Author Topic: Bogs at WOT  (Read 4298 times)

Offline captkcfd

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Bogs at WOT
« on: February 21, 2011, 08:11:04 AM »
Hi everybody I'm new here and having problem with my 1974 Corvette.  I have a stock L48 with 26,000 original mile and hooker headers with sidepipes that I just installed.  Car runs great but when I punch it it will bog down.  I bought Cliffs book and read things over.  I change my main jet from 75's to 77's and keep the rods at 46.  Still have the same problem!  I'm also looking at changing the intake and cam in the near future.  Looking for some advice on what I need to do?  Thanks Steve
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Offline davis95

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Re: Bogs at WOT
« Reply #1 on: February 21, 2011, 08:37:36 AM »
Sounds like the secondary air flap is opening too quickly. Check the pulloff (s) to make sure they are in working order. Also check the tension on the air flap  spring. It should be tightened about 3/4 of a turn just after the flap closes.
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Offline Cliff Ruggles

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Re: Bogs at WOT
« Reply #2 on: February 22, 2011, 03:39:52 AM »
Insufficient pump shot will cause the same thing.  I would upgrade the accellerator pump to the newer design that we sell off the website.

Installing larger jets will not have any effect on that problem, but may cause the carb to be too rich at cruise and WOT......Cliff
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Offline captkcfd

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Re: Bogs at WOT
« Reply #3 on: February 22, 2011, 07:09:58 AM »
The car ran good before I put the headers and pipes on it was after the install of these when the problem started.  Thanks for the repleys and as soon as it warms up here I'll start messing with it again and I'll order a rebuild kit today.
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Offline Cliff Ruggles

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Re: Bogs at WOT
« Reply #4 on: February 24, 2011, 03:58:37 AM »
Thanks.  We recomend a complete/correct rebuild with modern upgraded components first.  Once the carb is completley/correctly rebuilt, then you can effectively evaluate what it needs and go back and make changes, if/as needed.......Cliff
« Last Edit: March 19, 2011, 05:24:45 PM by Cliff Ruggles »
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Offline 17058263

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Re: Bogs at WOT
« Reply #5 on: March 01, 2011, 09:53:18 PM »
also with the open exauest it will lean the fuel curve out. i would make shure you pull off it working to. and change the secondary spring tension and rods
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Offline captkcfd

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Re: Bogs at WOT
« Reply #6 on: March 19, 2011, 07:28:31 AM »
Well I got the carb back together yesterday after rebuilding it with one of the HP kits and a bushing kit.  The car runs great and the best since I've owned it!!  So this is what a corvette feels like, what a joy! Thanks for your book and rebuild kit. 

Steve
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Offline Cliff Ruggles

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Re: Bogs at WOT
« Reply #7 on: March 19, 2011, 05:25:44 PM »
Good news Steve!.......Cliff
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