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Author Topic:   attn. kp
Whitelightning
Dirt Freak

Total posts: 429
posted November 06, 2003 08:42 PM  
I asked about adjusting the tention on back flaps on quadrajet, and I have loacated the screws and the allen nut but do I do this while its running of with it off. I did it with it off but when the engine is running you cant mask the plates open. So just needing to know if i done it right or wrong thanks

KPLugnut
Dirt Forum Champ
Total posts: 1019
posted November 06, 2003 08:57 PM  
If the rear flaps won't open no matter how much vacuum the motor feeds them, then you've got the spring way too tight, and need to loosen it. when they're closed, and the engine is off, there should be almost no tension on them. As they open, spring tension increases in the spring, so a good starting baseline is to "bench" adjust the spring so there is zero tension or near zero when they're closed.
The other thing to watch out for is a punctured diaphram in the pulloff that limits the secondary air flaps from bouncing back after they open. If that diaphram has failed, it'll never move its linkage and will hold the flaps shut no matter what.

Hope that helps,
KP

M1
Dirt Freak

Total posts: 257
posted November 06, 2003 09:05 PM  
Now if that diaphram for the secondary flaps is reomoved, and set just by the spring, could that be a "perfomance" deal? I was told by the race track that I could NOT remove anything from the carb but the choke mechanism. Does this fall under the choke department?

Thanks

Whitelightning
Dirt Freak

Total posts: 429
posted November 06, 2003 11:22 PM  
I guess I said that wrong they will open fine upon reving engine but when the engine is idling I tried to manully push the flaps opens from the top and there was a lot of tention on them and would not open but it will open fine upon acceleration. I adjusted them with it not running and I was under the impresstion that when you pushed them open they should have enuough tention to close on there own. There is very little tention on it now when it is not running, should I adjust with engine running untill they start to flap then tighten back up a little? I apoligize for so many questions and I have a hard time sometimes typing what I am trying to explain lol

KPLugnut
Dirt Forum Champ
Total posts: 1019
posted November 07, 2003 08:39 AM  
As for the question of whether the pulloff is legal to remove or not, well, that's a matter of whether or not the tech man is THAT picky. I don't believe it's any sort of noticeable performance gain not to have it on there, it's just a way of being able to use only the spring tension for adjustment and not have to rely on any vacuum signal to limit the functionality (in a nutshell).
Whitelightening, as long as they rear air flaps are opening immediately upon demand when the car is running, then you are fine and don't worry about how they feel when the engine is off. All you need to be concerned about is that there is NO delay in how fast they open when the throttle opens and vacuum demands from the engine require that large gain in CFM.

Hope tha helps,
KP

M1
Dirt Freak

Total posts: 257
posted November 08, 2003 12:03 AM  
KP,

The rules say "removale of the choke mechanism only" This is the same race track that DQ'd a guy, who was in first place for points, with two nights to go, for having a crank turned .010. Its not a stock crank then. (?????????????????????)

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