Author Topic: Few more carb tuning questions, ya'll!  (Read 1609 times)

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liaudio

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Few more carb tuning questions, ya'll!
« on: September 06, 2006, 03:41:46 PM »
OK, tried a few things and though not perfect, she's idling and running pretty good. 
Few more questions:

I moved the clip on the needle all the way to the bottom most position and have gotten the best results from that.  Midrange power seemed to improve with every position I moved the clip lower, but she doesn't really open up until about 6,500 rpms

Is there any way to have it go any further?  Can I put a shim or washer under the clip to raise the needle any further?  I'd like to see if that helps any more.

I noticed that the slide on carb number 4 was closed all the way when at rest.  The other 3 were a little less than an 1/8th of an inch open.  So I visually adjusted carb 4 to about that much.  It idles much, much better now!  I can't wait until I get my syncing tool in the mail!

When syncing the carbs, this is basically the procedure?  Syncing just has the slides on the carbs uniform?

WOT from a rolling start will still bog the motor.

Is this something I have to live with?  I'm sure that is not the case.

After hunting down some SeaFoam additive, I ran it through the carbs and threw some in the gastank.  It sure did smoke a lot!  I can't comment on how effective it was because I recently rebuilt the carbs and was very thorough.  I couldn't hurt though.

Again, Thanks for all your help!

P.S. - After 6,500 rpm's, she's a screamer!!!  Pulled to 100mph in no time at all.  Will I be sacrificing top-end power by getting rid of the pod filters?

Offline GroovieGhoulie

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Re: Few more carb tuning questions, ya'll!
« Reply #1 on: September 06, 2006, 03:59:53 PM »


WOT from a rolling start will still bog the motor.


At what RPM does WOT kill the motor?  Below about 3K or so, (give or take depending on the engine) the engine just isn't pulling enough air to maintain vacuum when the throttles are opened all the way.  That's just how it is.  Above 3K, it should take WOT no problem.

My 400F dies at WOT below 2.5K-3K, so I just keep the revs up.

liaudio

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Re: Few more carb tuning questions, ya'll!
« Reply #2 on: September 06, 2006, 07:22:59 PM »
anything under 3k's rpm's bogs the motor.  Does that help at all?
« Last Edit: September 06, 2006, 07:54:17 PM by liaudio »

Offline mrbreeze

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Re: Few more carb tuning questions, ya'll!
« Reply #3 on: September 06, 2006, 08:51:39 PM »
You might just piss your pants that your so happy after the carb synch!!!! It really makes a big difference.Just make sure that everything else on the tune up laundry list is done first and when you are doing the synch,have a fan or 2 keeping the engine cooled down.Happy wrenching and hope you get good results.
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Offline GroovieGhoulie

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Re: Few more carb tuning questions, ya'll!
« Reply #4 on: September 07, 2006, 05:00:20 AM »
anything under 3k's rpm's bogs the motor.  Does that help at all?

Sounds about right for these old engines.  It's normal.  Just roll on the throttle when down low and don't snap it open.  There you go.